Portable energy storage device and energy storage system

Abstract

The invention discloses a portable energy storage device and an energy storage system.The portable energy storage device comprises a shell assembly, an energy storage module, a connecting base and a connecting piece, the shell assembly comprises a bottom shell and a top shell which are arranged in a split mode in the first preset direction, and in the first preset direction, the height of the bottom shell is larger than that of the top shell; a connecting protrusion is arranged on the inner side wall face of the bottom shell in a protruding mode, the connecting protrusion is provided with a containing cavity and an opening communicated with the containing cavity, the energy storage module is arranged in the bottom shell and comprises an energy storage unit and a fixing piece wrapping the periphery of the energy storage unit, the energy storage unit is fixed in the bottom shell through the fixing piece, the fixing piece is provided with a fixing part, and the fixing part is arranged in the bottom shell. The fixing part is provided with a first through hole penetrating in the first preset direction, the structural strength of the connecting base is different from that of the connecting protrusion, the connecting base is embedded into the containing cavity from the opening, and the connecting piece penetrates through the first through hole from top to bottom in the first preset direction and is connected with the connecting base.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a portable energy storage device and an energy storage system. Background Art

[0002] In recent years, the application of energy storage products has become more and more extensive, and the demand for portable energy storage devices has also increased. Portable energy storage devices have gained more and more favor from users due to their small size, light weight, and ease of mobility.

[0003] In the related art, a portable energy storage device usually includes components such as a bottom shell, a top cover and a battery, and the battery is fixed inside the bottom shell by a fixing part. In order to improve the connection reliability between the fixing part and the bottom shell, a screw column with an insert nut embedded inside is usually provided inside the bottom shell, and a through hole is opened on the fixing part, so that the fixing part can be fastened by passing the screw through the through hole and screwing the insert nut, and the battery can be firmly fixed inside the bottom shell. Among them, when preparing the screw column, the insert nut is usually pre-fixed in an appropriate position in the injection mold, and then the plastic is injected for molding. In this way, when the mold is opened, the insert nut will be wrapped tightly in the plastic by the cooled and solidified plastic, and the screw column with the insert nut embedded inside can be obtained.

[0004] However, the screw column in the related technology is prone to shrinkage. At the same time, due to the different thermal expansion coefficients of the insert nut and the surrounding plastic parts (i.e., the screw column), the residual internal stress on the plastic part is too large after injection molding, which makes the plastic part prone to cracking, resulting in unstable connection of components and a safety hazard. Summary of the invention

[0005] The embodiments of the present application disclose a portable energy storage device and an energy storage system, which can realize the connection between the energy storage module and the bottom shell by means of screw connection, so as to improve the convenience of disassembly and assembly of the energy storage unit, reduce the risk of cracking and shrinkage of the connection protrusion, and improve the connection stability of the energy storage module in the bottom shell.

[0006] In order to achieve the above objectives, in a first aspect, the present application discloses a portable energy storage device, the portable energy storage device comprising:

[0007] A housing assembly, the housing assembly comprising a bottom housing and a top housing separately arranged in a first preset direction, wherein along the first preset direction, the height of the bottom housing is greater than the height of the top housing, and a connecting protrusion is convexly provided on the inner side wall surface of the bottom housing, and the connecting protrusion is provided with an accommodating cavity and an opening communicating with the accommodating cavity;

[0008] An energy storage module, the energy storage module is arranged inside the bottom shell, the energy storage module includes an energy storage unit and a fixing member covered on the periphery of the energy storage unit, the energy storage unit is fixed inside the bottom shell by the fixing member, the fixing member is provided with a fixing portion, and the fixing portion is provided with a first through hole penetrating along the first preset direction;

[0009] A connecting seat, the structural strength of which is different from that of the connecting protrusion, and the connecting seat is embedded in the accommodating cavity from the opening; and

[0010] A connecting member, wherein the connecting member passes through the first through hole from top to bottom along the first preset direction and is connected to the connecting seat.

[0011] In the portable energy storage device provided in the present application, a connecting protrusion having a accommodating cavity and an opening is formed on the inner wall surface of the bottom shell, and the opening is connected to the accommodating cavity, so that the connecting seat can be embedded and fixed in the accommodating cavity from the opening, thereby avoiding the need to embed and fix the connecting seat inside the connecting protrusion by insert injection molding, thereby reducing the occurrence of shrinkage and avoiding the situation where the residual internal stress on the connecting protrusion is too large and causes cracking, thereby reducing the risk of cracking of the connecting protrusion, and further ensuring the connection reliability between the energy storage module and the bottom shell, improving the connection stability of the energy storage module inside the bottom shell, and reducing safety hazards.

[0012] As an optional implementation, in an embodiment of the first aspect of the present application, the structural strength of the connecting seat is greater than the structural strength of the connecting protrusion.

[0013] Since the present application can still realize that the connecting seat is embedded and fixed inside the connecting protrusion, and the structural strength of the connecting seat is greater than the structural strength of the connecting protrusion, it can still ensure that the structure on the bottom shell connected to the connecting piece (i.e., the connecting seat, connecting protrusion, etc.) has a strong structural strength, thereby ensuring the connection reliability between the energy storage module and the bottom shell.

[0014] As an optional implementation, in an embodiment of the first aspect of the present application, the connecting member includes a locking member, which passes through the first through hole from top to bottom along the first preset direction and is screwed into the connecting seat, thereby enabling the energy storage module and the bottom shell to be fastened together by threads, thereby simplifying the disassembly and assembly method of the two and making the connection method between the two stable and reliable.

[0015] As an optional embodiment, in an embodiment of the first aspect of the present application, the opening is formed on the surface of the connecting protrusion facing the energy storage module, and the top wall of the connecting protrusion in the first preset direction is provided with a second through hole connected to the accommodating cavity and the first through hole; the connecting member passes through the first through hole and the second through hole in sequence from top to bottom along the first preset direction and is connected to the connecting seat.

[0016] Compared with the opening formed on the top surface of the connecting protrusion facing the top shell, the opening is formed on the surface of the connecting protrusion facing the energy storage module, which is equivalent to the connecting protrusion having a top wall in the first preset direction, but no side wall in the direction toward the energy storage module. In this way, on the one hand, due to the existence of the top wall, the size of the connecting protrusion and the connecting seat as a whole in the first preset direction can be larger, thereby increasing the load-bearing capacity of the connecting protrusion and the connecting seat as a whole in the first preset direction. Since the fixing portion is located at the top of the connecting protrusion in the first preset direction, the energy storage module mainly applies a force to the connecting protrusion and the connecting seat in the first preset direction. Therefore, the opening is formed on the surface of the connecting protrusion facing the energy storage module, which can make the connecting protrusion and the connecting seat as a whole can more reliably and stably support the energy storage module; on the other hand, since the connecting protrusion has no side wall in the direction toward the energy storage module, it is convenient to free up space to accommodate the energy storage module, thereby realizing the miniaturized design of the portable energy storage device.

[0017] As an optional implementation, in an embodiment of the first aspect of the present application, a direction perpendicular to both the first preset direction and the opening direction of the opening is configured as a second preset direction, and the opening direction is configured as a direction from the connecting protrusion to the energy storage module; the connecting protrusion has a first side wall and a second side wall arranged opposite to each other in the second preset direction, and the first side wall and / or the second side wall are provided with a limiting rib located in the accommodating cavity, and the limiting rib abuts against the connecting seat, for example, the limiting rib is used to limit the movement stroke of the connecting seat in the second preset direction to prevent the connecting seat from rotating relative to the connecting protrusion. In this way, the wall thickness of the first side wall and the second side wall can be kept roughly the same as the wall thickness of the bottom shell to avoid shrinkage, while ensuring that the position of the connecting seat is fixed and does not move in the left and right space in the second preset direction.

[0018] As an optional implementation, in an embodiment of the first aspect of the present application, there is a gap between the connecting seat and the limiting rib in the second preset direction, and / or, an adhesive layer bonded to both the connecting seat and the limiting rib is provided in the gap between the connecting seat and the limiting rib in the second preset direction.

[0019] In the above design, there is a gap between the connecting seat and the limiting rib in the second preset direction, that is, the space in the accommodating cavity for accommodating the connecting seat is larger than the connecting seat, so that the accommodating cavity can be used to adapt to connecting seats of different sizes and to assemble connecting seats with different apertures, which has high flexibility; at the same time, an adhesive is filled in the gap between the connecting seat and the limiting rib to form a glue layer, which can not only fill the gap between the connecting seat and the limiting rib so that the limiting rib can indirectly abut against the connecting seat through the glue layer to achieve the limiting effect on the connecting seat, but also the glue layer can be used to tightly fix the connecting seat in the accommodating cavity to prevent the connecting seat from detaching from the opening of the accommodating cavity of the connecting protrusion.

[0020] As an optional embodiment, in an embodiment of the first aspect of the present application, the bottom wall of the connecting protrusion in the first preset direction is protruded with a first supporting rib located in the accommodating cavity, and the first supporting rib is abutted against the connecting seat, and is combined with the design of an opening formed on the surface of the connecting protrusion facing the energy storage module, which can ensure that the connecting seat cannot be assembled into the accommodating cavity in a vertical state, avoid the connection from moving in the upper and lower spaces in the first preset direction, thereby ensuring that the position of the connecting seat is fixed, and at the same time, it can also avoid the thickness of the bottom wall of the connecting protrusion in the first preset direction being too thick, so that the bottom wall of the connecting protrusion can be kept roughly the same as the wall thickness of the bottom shell, thereby avoiding shrinkage.

[0021] As an optional embodiment, in an embodiment of the first aspect of the present application, the top wall of the connecting protrusion in the first preset direction is protruded with a boss extending along the first preset direction, the boss is located outside the accommodating cavity, and the boss and the inner wall of the bottom shell are spaced apart, and the second through hole penetrates the boss along the first preset direction.

[0022] By providing a boss spaced apart from the inner wall of the bottom shell and allowing the second through hole to penetrate the boss along the first preset direction, a local thickening design of the top wall of the connecting protrusion is achieved. Specifically, the thickness at the peripheral position for the connecting member to pass through is increased, while the wall thickness at the position where the top wall of the connecting protrusion is connected to the inner wall of the bottom shell can be kept roughly the same to avoid shrinkage at the position where the top wall of the connecting protrusion is connected to the inner wall of the bottom shell. In this way, the boss can be used to increase the supporting capacity of the connecting protrusion for the energy storage module, and the possibility of shrinkage can be reduced, thereby ensuring the structural stability of the connecting protrusion.

[0023] As an optional implementation, in an embodiment of the first aspect of the present application, the boss is provided with a plurality of first reinforcing ribs arranged at intervals along the circumference of the boss, and the first reinforcing ribs are connected to the outer circumferential surface of the boss and the top wall of the connecting protrusion in the first preset direction. Thus, the first reinforcing ribs can be used to enhance the structural strength of the boss, so that the boss can withstand a larger force, thereby further improving the supporting capacity of the connecting protrusion for the energy storage module and improving the connection reliability between the energy storage module and the bottom shell.

[0024] As an optional implementation, in an embodiment of the first aspect of the present application, the top wall of the connecting protrusion in the first preset direction is provided with a second reinforcing rib located outside the accommodating cavity, and at least one of the second reinforcing ribs is connected to the inner wall surface of the bottom shell. The top wall of the connecting protrusion is connected to the inner wall surface of the bottom shell by the second reinforcing rib to disperse the stress, thereby reducing the possibility of shrinkage and avoiding the shrinkage problem caused by the increase of the local wall thickness of the top wall of the connecting protrusion.

[0025] As an optional implementation, in an embodiment of the first aspect of the present application, the bottom wall of the connecting protrusion in the first preset direction is provided with a second supporting rib located outside the accommodating cavity, the second supporting rib is connected to the inner wall surface of the bottom shell, and the second supporting rib extends along the first preset direction to connect to the inner bottom surface of the bottom shell. In this way, the second supporting rib can be used to support the connecting protrusion, avoiding the connecting protrusion being suspended in the first preset direction, thereby facilitating further improving the supporting capacity of the connecting protrusion for the energy storage module and improving the connection reliability between the energy storage module and the bottom shell.

[0026] As an optional embodiment, in an embodiment of the first aspect of the present application, a direction perpendicular to both the first preset direction and the opening direction of the opening is configured as a second preset direction; the second support ribs include at least two sub-support ribs arranged at intervals along the second preset direction, and two adjacent sub-support ribs are connected by a plurality of connecting ribs arranged at intervals along the first preset direction.

[0027] Compared with using a second supporting rib with relatively thick thickness to support the connecting protrusion, using at least two spaced-apart sub-support ribs can ensure the supporting effect of the second supporting rib on the connecting protrusion while avoiding the thickness of the second supporting rib in the second preset direction being too thick, so that the thickness of the second supporting rib can be kept roughly the same as the wall thickness of the bottom shell, thereby avoiding the occurrence of shrinkage; at the same time, the present application also forms a connecting rib between two adjacent sub-support ribs, and the two ends of the connecting rib are respectively connected to the two adjacent sub-support ribs, thereby improving the overall structural stability of the second supporting rib, further improving the supporting capacity of the connecting protrusion to the energy storage module, and improving the connection reliability between the energy storage module and the bottom shell.

[0028] As an optional implementation, in an embodiment of the first aspect of the present application, the end of the bottom shell close to the top shell has a first stop surface abutting against the top shell, the end of the top shell close to the bottom shell has a second stop surface abutting against the first stop surface, and one of the first stop surface and the second stop surface is provided with a positioning protrusion, and the other of the first stop surface and the second stop surface is provided with a positioning groove, and the positioning protrusion is embedded in the positioning groove. In this way, when the top shell is assembled to the bottom shell, the cooperation of the positioning protrusion and the positioning groove can be used to position and limit the assembly between the top shell and the bottom shell, so that the two can be assembled together and the assembly efficiency of the two can be improved.

[0029] As an optional embodiment, in an embodiment of the first aspect of the present application, the first stop surface is provided with a positioning protrusion, and the second stop surface is provided with a positioning groove, the positioning groove passes through the inner wall surface of the top shell, and the inner wall surface of the top shell is provided with a plurality of reinforcing ribs arranged at intervals along the circumference of the top shell, and the reinforcing ribs extend along the first preset direction until they abut against the positioning protrusion.

[0030] In this way, the reinforcing ribs can be used to enhance the structural strength of the top shell and ensure the service life of the top shell; the reinforcing ribs can also be used as a groove wall of the positioning groove to abut against the positioning protrusion, thereby forming a larger positioning groove along the wall thickness direction of the top shell to cooperate with the positioning protrusion while reducing the wall thickness of the top shell, thereby facilitating the lightweight design of the top shell, so that the user can carry the portable energy storage device by hand.

[0031] As an optional implementation, in an embodiment of the first aspect of the present application, the portable energy storage device also includes a circuit board assembly, which is arranged inside the bottom shell, and the circuit board assembly is located on one side of the energy storage module, and the reinforcing ribs arranged near the circuit board assembly are provided with avoidance gaps for avoiding the circuit board assembly, so as to prevent the reinforcing ribs from interfering with the circuit board assembly inside the bottom shell, thereby ensuring the smooth assembly of various components and thus ensuring the completeness of the internal structure of the bottom shell.

[0032] In a second aspect, the present application discloses an energy storage system, which has a portable energy storage device as described in the first aspect. The energy storage system having the portable energy storage device as described in the first aspect can also realize the connection between the energy storage module and the bottom shell by screw connection, so as to improve the convenience of disassembly and assembly of the energy storage unit, reduce the risk of cracking and shrinkage of the connection protrusion, and improve the connection stability of the energy storage module in the bottom shell.

[0033] Compared with the prior art, the beneficial effects of this application are:

[0034] The portable energy storage device and energy storage system provided in the embodiments of the present application form a connecting protrusion with a accommodating cavity and an opening on the inner wall surface of the bottom shell, and the opening is connected to the accommodating cavity, so that the connecting seat can be embedded and fixed in the accommodating cavity from the opening, thereby avoiding the need to embed and fix the connecting seat inside the connecting protrusion by insert injection molding, thereby reducing the occurrence of shrinkage and avoiding the situation where the residual internal stress on the connecting protrusion is too large and causes cracking, thereby reducing the risk of cracking of the connecting protrusion, and further ensuring the connection reliability between the energy storage module and the bottom shell, improving the connection stability of the energy storage module inside the bottom shell, and reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 is a schematic diagram of the structure of a portable energy storage device disclosed in an embodiment of the present application;

[0037] Figure 2 is a schematic diagram of the exploded structure of the portable energy storage device disclosed in the embodiment of the present application;

[0038] Figure 3 It is a schematic diagram of the exploded structure of the energy storage module and the circuit board assembly disclosed in the embodiment of the present application;

[0039] Figure 4 It is a structural schematic diagram of the bottom shell and the connecting seat disclosed in the embodiment of the present application;

[0040] Figure 5 yes Figure 4 A local enlarged view of the M in FIG.

[0041] Figure 6 It is a schematic diagram of the exploded structure of the bottom shell and the connecting seat disclosed in the embodiment of the present application;

[0042] Figure 7 yes Figure 6 A local enlarged view of the N position in FIG.

[0043] Figure 8 is a top view of a portable energy storage device disclosed in an embodiment of the present application;

[0044] Fig. 9 The portable energy storage device disclosed in the embodiment of the present application is Figure 8 The cross-sectional view in the AA direction;

[0045] Fig.10 yes Fig. 9 A local enlarged view of O in FIG.

[0046] Fig.11 It is a schematic diagram of the structure of the top shell disclosed in the embodiment of the present application.

[0047] Description of main reference numerals

[0048] 100-Portable energy storage device;

[0049] 10-housing assembly; 11-bottom shell; 11a-first stop surface; 111-connecting protrusion; 111a-first side wall; 111b-second side wall; 1111-accommodating cavity; 1112-opening; 1113-second through hole; 112-limiting rib; 113-first supporting rib; 114-boss; 115a-first reinforcing rib; 115b-second reinforcing rib; 116-glue reduction groove; 117-second supporting rib; 117a-sub-support Rib; 118-connecting rib; 119-positioning protrusion; 12-top shell; 12a-second stop surface; 121-positioning groove; 122-reinforcement rib; 1221-avoidance gap; 20-energy storage module; 21-energy storage unit; 22-fixing member; 22a-first fixing member; 22b-second fixing member; 22c-connecting member; 221-fixing part; 222-first through hole; 30-connecting seat; 40-connecting member; 50-circuit board assembly;

[0050] f1-first preset direction; f2-opening direction; f3-second preset direction. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0053] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first through hole may be referred to as a second through hole, and similarly, a second through hole may be referred to as a first through hole. Both the first through hole and the second through hole are through holes, but they are not the same through hole.

[0054] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission with each other.

[0055] When used herein, the singular forms of "a", "an" and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the existence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the existence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone. That is, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0056] See also Figure 1 The embodiments of the present application disclose an energy storage device, such as a portable energy storage device 100, and in particular disclose a portable energy storage device 100 with a miniaturized design, so that a user can carry the portable energy storage device 100 to facilitate moving the portable energy storage device 100.

[0057] See also Figure 1 and Figure 2 The portable energy storage device 100 provided in the embodiment of the present application includes a housing assembly 10 and an energy storage module 20 .

[0058] In the present application, the housing assembly 10 includes a bottom shell 11 and a top shell 12 which are separately arranged in a first preset direction f1, and along the first preset direction f1, the height of the bottom shell 11 is greater than the height of the top shell 12. The energy storage module 20 is arranged inside the bottom shell 11, and the energy storage module 20 includes an energy storage unit 21 and a fixing member 22 wrapped around the periphery of the energy storage unit 21, so that the energy storage unit 21 can be fixed inside the bottom shell 11 by the fixing member 22 to avoid the energy storage unit 21 shaking inside the bottom shell 11, causing the connection terminal to loosen, thereby causing the electrical connection between the energy storage unit 21 and the control component to fail.

[0059] Optionally, the energy storage unit 21 may include one or more battery cells. When the energy storage unit 21 includes multiple battery cells, such as two, three, four, five, six or more battery cells, the multiple battery cells may be arranged in a straight line along the first direction, or may be arranged in an array along the first direction and the second direction, wherein the first direction, the second direction and the first preset direction f1 are perpendicular to each other. And the multiple battery cells may be connected in series or in parallel with each other. For example, Figure 2 and Figure 3 As shown, the bottom shell 11 is a rectangular parallelepiped structure, wherein the first preset direction f1 can be understood as the height direction of the bottom shell 11, the first direction can be understood as the width direction of the top shell 12, and the second direction can be understood as the length direction of the bottom shell 11. And the energy storage unit 21 includes two battery cells connected in series, each of which is a rectangular parallelepiped structure, and the two battery cells connected in series are arranged along the first direction.

[0060] As an example, Figure 2 and Figure 3 As shown, the fixing member 22 may include a first fixing member 22a, a second fixing member 22b and a connecting member 22c, the large surfaces of the cells at both ends are respectively abutted against the inner side walls of the first fixing member 22a and the second fixing member 22b, and the connecting member 22c is clamped on the outer side walls of the first fixing member 22a and the second fixing member 22b to clamp and fix the multiple cells, that is, the first fixing member 22a is covered on the large surface side of the cell at one end, and the second fixing member 22b is covered on the large surface side of the cell at the other end, and the outer side walls of the first fixing member 22a and the second fixing member 22b are sleeved by the connecting member 22c to clamp and fix the multiple cells, so that the multiple cells can be fixed inside the bottom shell 11 through the fixing member 22. Among them, the connecting member 22c can be a flexible member, such as a cable tie, a binding strap, etc.

[0061] In this way, during actual assembly, the first fixing component 22a can be first covered on the large surface side of the battery cell at one end, and the second fixing component 22b can be covered on the large surface side of the battery cell at the other end, and then the connecting component 22c can be clamped on the outer side walls of the first fixing component 22a and the second fixing component 22b to clamp and fix the multiple battery cells. Compared with the fixing part 22 which is an integrated structure with an inner cavity and an installation entrance, it can avoid the situation where the inner cavity wall rubs against the energy storage unit 21 when the energy storage unit 21 is installed into the inner cavity from the installation entrance against the wall of the inner cavity, thereby causing the energy storage unit 21 to be worn.

[0062] See also Figures 2 to 5, the inner wall surface of the bottom shell 11 in the present application is provided with a connecting protrusion 111, and the connecting protrusion 111 is provided with a receiving cavity 1111 and an opening 1112 communicating with the receiving cavity 1111; the fixing member 22 is provided with a fixing portion 221, and the fixing portion 221 is located at the top of the connecting protrusion 111 in the first preset direction f1, and the fixing portion 221 is provided with a first through hole 222 that passes through along the first preset direction f1. And the portable energy storage device 100 provided in the embodiment of the present application also includes a connecting seat 30 and a connecting member 40, the structural strength of the connecting seat 30 is different from the structural strength of the connecting protrusion 111, and the connecting seat 30 is embedded in the receiving cavity 1111 of the connecting protrusion 111 from the opening 1112 of the connecting protrusion 111, and the connecting member 40 passes through the first through hole 222 from top to bottom along the first preset direction f1 and is connected to the connecting seat 30.

[0063] Optionally, the bottom shell 11 and the connecting protrusion 111 can be integrally formed, and the materials of the two can be the same. Exemplarily, the materials of the bottom shell 11 and the connecting protrusion 111 are silicone, plastic, rubber, etc. The material of the connecting seat 30 can be metal, such as stainless steel, copper, copper alloy, aluminum, aluminum alloy, and silicone, plastic, rubber, etc. with a hardness greater than that of the connecting protrusion 111.

[0064] By adopting the above-mentioned design scheme, it is possible to avoid embedding and fixing the connecting seat 30 inside the connecting protrusion 111 by means of insert injection molding, thereby reducing the occurrence of shrinkage and avoiding the situation where the residual internal stress on the connecting protrusion 111 is too large and causes cracking, thereby reducing the risk of cracking of the connecting protrusion 111, and further ensuring the connection reliability between the energy storage module 20 and the bottom shell 11, improving the connection stability of the energy storage module 20 inside the bottom shell 11, and reducing safety hazards.

[0065] In some embodiments, the structural strength of the connection base 30 is greater than the structural strength of the connection protrusion 111 .

[0066] Since the present application can still realize that the connecting seat 30 is embedded and fixed inside the connecting protrusion 111, and the structural strength of the connecting seat 30 is greater than the structural strength of the connecting protrusion 111, it is still possible to ensure that the structure on the bottom shell 11 connected to the connecting member 40 (i.e., the connecting seat 30, the connecting protrusion 111, etc.) has a strong structural strength, thereby ensuring the connection reliability between the energy storage module 20 and the bottom shell 11.

[0067] In some embodiments, the connector 40 includes a locking member, which passes through the first through hole 222 from top to bottom along the first preset direction f1 and is screwed into the connector 30, thereby enabling the energy storage module 20 and the bottom shell 11 to be fastened by threads, thereby simplifying the disassembly and assembly of the two, and making the connection between the two stable and reliable. The connector 40 in this embodiment can be a bolt, a screw, etc.

[0068] In other embodiments, the connecting member 40 may include a buckle member, which passes through the first through hole 222 from top to bottom along the first preset direction f1 and is buckled and connected to the connecting seat 30 .

[0069] Optionally, the shape of the connection base 30 may be square, such as a rectangle, a square, etc., and the shape of the accommodating cavity 1111 may be a square that matches the shape of the connection base 30. Specifically, when the shape of the connection base 30 is rectangular, the shape of the accommodating cavity 1111 is also rectangular, and when the shape of the connection base 30 is square, the shape of the accommodating cavity 1111 is also square. In this way, when the connecting member 40 is tightened or loosened, the connection base 30 is prevented from rotating, so as to ensure that the connecting member 40 can be smoothly connected to or separated from the connection base 30, and the energy storage module 20 can be smoothly disassembled and assembled.

[0070] At the same time, compared with the screw column with an insert nut embedded inside, the outside of the insert nut usually has knurling or other patterns to prevent the insert nut from rotating or loosening, but the depth of the knurling or other patterns embedded in the screw column is limited, and there is still a relatively large probability that the insert nut will rotate or loosen, or even cut the screw column and cause cracks in the screw column, thereby affecting the stability of the structure. The present application adopts a connecting seat 30 and a accommodating cavity 1111 that are both square in shape, instead of the knurling or other patterns on the outside of the insert nut, which can effectively prevent the connecting seat 30 from rotating or loosening in the accommodating cavity 1111 and reduce the probability of cracks in the connecting protrusion 111, thereby ensuring the overall structural strength of the connecting protrusion 111 and the connecting seat 30, which is beneficial to improving the connection reliability between the energy storage module 20 and the bottom shell 11.

[0071] Furthermore, the shape of the connecting protrusion 111 is also correspondingly square, so as to form a square accommodating cavity 1111 on the connecting protrusion 111 , and also to maintain the same wall thickness at each position of the connecting protrusion 111 , thereby preventing the connecting protrusion 111 from shrinking.

[0072] It is understandable that the connection protrusion 111 can be provided on at least one inner wall surface of the bottom shell 11 in the width direction, or on at least one inner wall surface of the bottom shell 11 in the length direction, and one inner wall surface of the bottom shell 11 can be provided with one or more connection protrusions 111. The present application does not specifically limit the location and number of the connection protrusions 111, that is, the specific location and number of the connection protrusions 111 can be selected and determined according to actual needs. For example, Figure 4 As shown, two connecting protrusions 111 are protruded from the two inner side wall surfaces of the bottom shell 11 in the width direction.

[0073] As an embodiment, the opening 1112 can be formed on the surface of the connecting protrusion 111 facing the energy storage module 20, and the top wall of the connecting protrusion 111 in the first preset direction f1 is provided with a second through hole 1113 connected to the accommodating cavity 1111 and the first through hole 222; the connecting member 40 passes through the first through hole 222 and the second through hole in sequence from top to bottom along the first preset direction f1 and is screwed into the connecting seat 30.

[0074] Compared with the opening 1112 formed on the top surface of the connecting protrusion 111 facing the top shell 12, the opening 1112 is formed on the surface of the connecting protrusion 111 facing the energy storage module 20, which is equivalent to the connecting protrusion 111 having a top wall in the first preset direction f1, and no side wall in the direction toward the energy storage module 20. In this way, on the one hand, due to the existence of the top wall, the size of the connecting protrusion 111 and the connecting seat 30 as a whole in the first preset direction f1 can be larger, thereby increasing the bearing capacity of the connecting protrusion 111 and the connecting seat 30 as a whole in the first preset direction f1, and due to the fixing portion 221 is located at the top of the connecting protrusion 111 in the first preset direction f1, and the energy storage module 20 mainly applies a force to the connecting protrusion 111 and the connecting seat 30 in the first preset direction f1, so the opening 1112 is formed on the surface of the connecting protrusion 111 facing the energy storage module 20, so that the connecting protrusion 111 and the connecting seat 30 as a whole can more reliably and stably support the energy storage module 20; on the other hand, since there is no side wall of the connecting protrusion 111 in the direction toward the energy storage module 20, it is convenient to free up space to accommodate the energy storage module 20, thereby realizing the miniaturized design of the portable energy storage device 100.

[0075] In the present application, for the convenience of description, the direction perpendicular to both the first preset direction f1 and the opening direction f2 of the opening 1112 is configured as the second preset direction f3, wherein the direction of the opening 1112 is configured as the direction from the connecting protrusion 111 to the energy storage module. It should be understood that the above definition is only limited for the convenience of description and should not be used to limit the protection scope of the present application.

[0076] As an example, Figure 6 and Figure 7As shown, the connecting protrusion 111 in the present application has a first side wall 111a and a second side wall 111b which are arranged opposite to each other in the second preset direction f3, and the first side wall 111a and / or the second side wall 111b are provided with a limiting rib 112 located in the accommodating cavity 1111, that is, only the first side wall 111a may be provided with a limiting rib 112 located in the accommodating cavity 1111, or only the second side wall 111b may be provided with a limiting rib 112 located in the accommodating cavity 1111, or the first side wall 111a and the second side wall 111b may be provided with a limiting rib 112 located in the accommodating cavity 1111 at the same time, and the limiting rib 112 abuts against the connecting seat 30, for example, the limiting rib 112 is used to limit the movement stroke of the connecting seat 30 in the second preset direction f3, that is, the connecting seat 30 will not move along the second preset direction f3 under the limiting action of the limiting rib 112. In this way, the wall thickness of the first side wall 111a and the second side wall 111b can be kept substantially the same as the wall thickness of the bottom shell 11 to avoid shrinkage, while ensuring that the position of the connecting seat 30 is fixed and does not move in the left and right space in the second preset direction f3.

[0077] Optionally, there is a gap between the connecting seat 30 and the limiting rib 112 in the second preset direction f3, and / or, an adhesive layer (not shown) bonded to both the connecting seat 30 and the limiting rib 112 is provided in the gap, and the limiting rib 112 is indirectly abutted against the connecting seat 30 through the adhesive layer.

[0078] In the above design, there is a gap between the connecting seat 30 and the limiting rib 112 in the second preset direction f3, that is, the space in the accommodating cavity 1111 for accommodating the connecting seat 30 is larger than the connecting seat 30, so that the accommodating cavity 1111 can be used to adapt to connecting seats 30 of different sizes, and to assemble connecting seats 30 with different apertures, which has high flexibility; at the same time, an adhesive is filled in the gap between the connecting seat 30 and the limiting rib 112 to form an adhesive layer, which can not only fill the gap between the connecting seat 30 and the limiting rib 112 with the adhesive layer, so that the limiting rib 112 can indirectly abut against the connecting seat 30 through the adhesive layer to achieve the limiting effect on the connecting seat 30, but also can use the adhesive layer to tightly fix the connecting seat 30 in the accommodating cavity 1111 to prevent the connecting seat 30 from being separated from the accommodating cavity 1111 of the connecting protrusion 111 from the opening 1112.

[0079] Optionally, the upper surface of the limiting rib 112 in the first preset direction f1 has a distance from the top wall of the connecting protrusion 111, and the lower surface of the limiting rib 112 in the first preset direction f1 also has a distance from the bottom wall of the connecting protrusion 111. This can prevent the limiting rib 112 from being too thick in the first preset direction f1, so that the wall thickness of the limiting rib 112, the connecting protrusion 111 and the bottom shell 11 can be kept roughly the same, reducing the possibility of shrinkage; at the same time, the distance between the upper surface of the limiting rib 112 and the top wall of the connecting protrusion 111, and the distance between the lower surface of the limiting rib 112 and the bottom wall of the connecting protrusion 111, can be used as glue filling space to increase the bonding area between the connecting seat 30 and the glue layer, and improve the stability of the connecting seat 30 in the accommodating cavity 1111.

[0080] As an example, Figure 6 and Figure 7 As shown, the bottom wall of the connecting protrusion 111 in the first preset direction f1 is provided with a first supporting rib 113 located in the accommodating cavity 1111, and the first supporting rib 113 is in contact with the connecting seat 30, and the opening 1112 is formed on the surface of the connecting protrusion 111 facing the energy storage module, thereby ensuring that the connecting seat 30 cannot be assembled into the accommodating cavity 1111 in a vertical state, avoiding the movement of the upper and lower spaces when connected in the first preset direction f1, thereby ensuring that the position of the connecting seat 30 is fixed, and at the same time, it can also avoid the thickness of the bottom wall of the connecting protrusion 111 in the first preset direction f1 being too thick, so that the bottom wall of the connecting protrusion 111 can be kept roughly the same as the wall thickness of the bottom shell 11, thereby avoiding shrinkage.

[0081] Optionally, the two side surfaces of the first supporting rib 113 in the second preset direction f3 are spaced from the first side wall 111a and the second side wall 111b, respectively, so as to avoid the first supporting rib 113 being too thick in the second preset direction f3, so that the wall thicknesses of the first supporting rib 113, the limiting rib 112, the connecting protrusion 111 and the bottom shell 11 can be kept substantially the same, thereby reducing the possibility of shrinkage.

[0082] Furthermore, there may be multiple first support ribs 113, for example, two, three, four, etc., and the multiple first support ribs 113 are arranged at intervals along the second preset direction f3. In this way, on the one hand, the thickness of the first support rib 113 in the second preset direction f3 can be prevented from being too thick, so that the wall thickness of the first support rib 113, the limiting rib 112, the connecting protrusion 111 and the bottom shell 11 can be kept roughly the same, thereby reducing the possibility of shrinkage; on the other hand, the distance formed between two adjacent first support ribs 113 can be used as a glue filling space, thereby increasing the bonding area between the connecting seat 30 and the glue layer, and improving the stability of the connecting seat 30 in the accommodating cavity 1111.

[0083] As an embodiment, a top wall of the connecting protrusion 111 in the first preset direction f1 is provided with a boss 114 extending along the first preset direction f1, the boss 114 is located outside the accommodating cavity 1111, and the boss 114 and the inner wall of the bottom shell 11 are spaced apart, and the second through hole 1113 passes through the boss 114 along the first preset direction f1. By providing a boss 114 spaced apart from the inner wall of the bottom shell 11, and allowing the second through hole 1113 to penetrate the boss 114 along the first preset direction f1, a local thickening design of the top wall of the connecting protrusion 111 is achieved. Specifically, the thickness at the peripheral position for the connecting member to pass through is increased, while the wall thickness at the position where the top wall of the connecting protrusion 111 is connected to the inner wall of the bottom shell 11 can be kept roughly the same to avoid shrinkage at the position where the top wall of the connecting protrusion 111 is connected to the inner wall of the bottom shell 11. In this way, the boss 114 can be used to increase the supporting capacity of the connecting protrusion 111 for the energy storage module, and the possibility of shrinkage can be reduced, thereby ensuring the structural stability of the connecting protrusion 111.

[0084] Optionally, the boss 114 is provided with a plurality of first reinforcing ribs 115a arranged at intervals along the circumference of the boss 114, and each first reinforcing rib 115a is connected to the outer circumferential surface of the boss 114 and the top wall of the connecting protrusion 111 in the first preset direction f1. Thus, the first reinforcing ribs 115a can be used to enhance the structural strength of the boss 114, so that the boss 114 can withstand a larger force, thereby further improving the supporting capacity of the connecting protrusion 111 for the energy storage module, and improving the connection reliability between the energy storage module and the bottom shell 11.

[0085] As an embodiment, the top wall of the connecting protrusion 111 in the first preset direction f1 is provided with a second reinforcing rib 115b located outside the accommodating cavity 1111, and at least one second reinforcing rib 115b is connected to the inner wall surface of the bottom shell 11. The top wall of the connecting protrusion 111 is connected to the inner wall surface of the bottom shell 11 by the second reinforcing rib 115b, so as to disperse the stress, reduce the possibility of shrinkage, and avoid the shrinkage problem caused by the increase of the local wall thickness of the top wall of the connecting protrusion 111.

[0086] Optionally, there may be multiple second reinforcing ribs 115b, such as two, three, four, five, six, etc., and the multiple second reinforcing ribs 115b are arranged at intervals along the second preset direction f3, thereby better dispersing the stress and reducing the possibility of shrinkage, while avoiding the second reinforcing ribs 115b from being too thick in the second preset direction f3, thereby avoiding the second reinforcing ribs 115b from shrinking.

[0087] As an embodiment, a glue reduction groove 116 is provided at the connection between the top wall of the connecting protrusion 111 in the first preset direction f1 and the inner wall of the bottom shell 11. By designing the glue reduction groove 116 at the connection between the top wall of the connecting protrusion 111 and the inner wall of the bottom shell 11, a glue reduction process is performed to eliminate the shrinkage problem of the bottom shell 11 connecting protrusion 111 corresponding to the front side of the bottom shell 11.

[0088] As an example, Figure 6 and Figure 7 As shown, the bottom wall of the connecting protrusion 111 in the first preset direction f1 is provided with a second supporting rib 117 located outside the accommodating cavity 1111, and the second supporting rib 117 is connected to the inner wall surface of the bottom shell 11, and the second supporting rib 117 extends along the first preset direction f1 to connect with the inner bottom surface of the bottom shell 11. Thus, the connecting protrusion 111 can be supported by the second supporting rib 117, and the connecting protrusion 111 is prevented from being suspended in the first preset direction f1, which is conducive to further improving the supporting capacity of the connecting protrusion 111 for the energy storage module and improving the connection reliability between the energy storage module and the bottom shell 11.

[0089] Optionally, the second supporting ribs 117 include at least two sub-supporting ribs 117a arranged at intervals along the second preset direction f3, and a plurality of connecting ribs 118 arranged at intervals along the first preset direction f1 are connected between two adjacent sub-supporting ribs 117a. Compared with using a relatively thick second support rib 117 to support the connecting protrusion 111, using at least two spaced-apart sub-support ribs 117a can ensure the supporting effect of the second support rib 117 on the connecting protrusion 111 while avoiding the thickness of the second support rib in the second preset direction f3 being too thick, so that the thickness of the second support rib 117 can be kept roughly the same as the wall thickness of the bottom shell 11, thereby avoiding the occurrence of shrinkage; at the same time, the present application also forms a connecting rib 118 between two adjacent sub-support ribs 117a, and the two ends of the connecting rib 118 are respectively connected to the two adjacent sub-support ribs 117a, thereby improving the overall structural stability of the second support rib 117, further improving the supporting capacity of the connecting protrusion 111 to the energy storage module, and improving the connection reliability between the energy storage module 20 and the bottom shell 11.

[0090] As an example, combining Figures 8 to 10As shown, one end of the bottom shell 11 close to the top shell 12 has a first stop surface 11a abutting against the top shell 12, and one end of the top shell 12 close to the bottom shell 11 has a second stop surface 12a abutting against the first stop surface 11a, and one of the first stop surface 11a and the second stop surface 12a is provided with a positioning protrusion 119, and the other of the first stop surface 11a and the second stop surface 12a is provided with a positioning groove 121, that is, when the first stop surface 11a is provided with the positioning protrusion 119, the second stop surface 12a is provided with the positioning groove 121, and when the first stop surface 11a is provided with the positioning groove 121, the second stop surface 12a is provided with the positioning protrusion 119, and the positioning protrusion 119 is embedded in the positioning groove 121. In this way, when the top shell 12 is assembled to the bottom shell 11, the cooperation between the positioning protrusion 119 and the positioning groove 121 can be used to position and limit the assembly between the top shell 12 and the bottom shell 11, so as to facilitate the assembly of the two together and improve the assembly efficiency of the two.

[0091] When the first stop surface 11a is provided with a positioning protrusion 119 and the second stop surface 12a is provided with a positioning groove 121, the positioning groove 121 passes through the inner wall surface of the top shell 12, and the inner wall surface of the top shell 12 is provided with a plurality of reinforcing ribs 122 arranged at intervals along the circumference of the top shell 12, and the reinforcing ribs 122 extend along the first preset direction f1 to abut against the positioning protrusion 119, for example, against one side of the positioning protrusion 119 in the wall thickness direction of the bottom shell 11. In this way, the reinforcing ribs 122 can be used to enhance the structural strength of the top shell 12 and ensure the service life of the top shell 12; the reinforcing ribs 122 can also be used as a groove wall of the positioning groove 121 to abut against the positioning protrusion 119, thereby forming a positioning groove 121 with a larger size along the wall thickness direction of the top shell 12, so as to cooperate with the positioning protrusion 119 while reducing the wall thickness of the top shell 12, thereby facilitating the lightweight design of the top shell 12, so that the user can carry and move the portable energy storage device 100 by hand.

[0092] As an example, Fig.10 , Fig.11 and Figure 2 As shown, the portable energy storage device 100 also includes a circuit board assembly 50, which is arranged inside the bottom shell 11, and the circuit board assembly 50 is located on one side of the energy storage module 20, and the reinforcing ribs 122 arranged near the circuit board assembly 50 are provided with avoidance gaps 1221 for avoiding the circuit board assembly 50, so as to prevent the reinforcing ribs 122 from interfering with the circuit board assembly 50 inside the bottom shell 11, thereby ensuring the smooth assembly of various components and thus ensuring the completeness of the internal structure of the bottom shell 11.

[0093] Among them, the circuit board assembly 50 can be integrated with electronic components such as a bidirectional buck-boost converter and an inverter, so that when the energy storage module 20 of the present application is discharged, the low-voltage DC (for example, 3.2V DC) output by the energy storage module 20 will first be boosted to 310V DC by the bidirectional buck-boost converter on the circuit board assembly 50, and then inverted into 220V AC by the inverter on the circuit board assembly 50 to meet the charging requirements of the device to be charged, thereby realizing the discharge of the energy storage module 20; and when the energy storage module 20 of the present application is charged, the external input 220V AC will first be inverted into 310V DC by the inverter on the circuit board assembly 50, and then stepped down to a voltage of 3.2V DC by the bidirectional buck-boost converter on the circuit board assembly 50 to meet the charging requirements of the energy storage module 20, thereby realizing the charging of the energy storage module 20.

[0094] It can be understood that in actual use, the circuit board assembly 50 can be integrated with different functional electronic components according to the application scenario of the portable energy storage device 100 to meet application requirements.

[0095] Furthermore, in addition to the bidirectional buck-boost converter and inverter, the circuit board assembly 50 in the present application can also be integrated with a battery management system (Battery Management System, BMS for short), so that the circuit board assembly 50 can be used as a key component for monitoring, controlling and protecting the energy storage module 20. For example, it can monitor and manage parameters such as the voltage, temperature, charging state and discharging state of the energy storage module 20, so as to avoid dangerous situations such as overcharging, over-discharging, overcurrent and short circuit, ensure the safe operation of the energy storage module 20 and improve the service life of the energy storage module 20.

[0096] Optionally, the circuit board assembly 50 is arranged on the side where the small surface of each battery cell is located. Since the expansion deformation of the battery cell is mainly on the large surface of the battery cell, the degree of compression of the circuit board assembly 50 by the battery cell during expansion can be reduced to avoid damage to the circuit board assembly 50, thereby facilitating the improvement of the service life of the circuit board assembly 50.

[0097] The embodiment of the present invention also discloses an energy storage system, which has a portable energy storage device as described in any of the aforementioned embodiments. Specifically, the energy storage system may include an electrical device and a portable energy storage device as described in any of the aforementioned embodiments, and the portable energy storage device may be used to supply power to the electrical device. It is understandable that the energy storage system having the portable energy storage device described above can bring the same or similar beneficial effects as the portable energy storage device, and the specific details can be referred to the description of the embodiment of the portable energy storage device, which will not be repeated here.

[0098] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] In addition, the above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the content of this specification should not be understood as limiting the present application, and the protection scope of the present application shall be subject to the attached claims.

Claims

1. A portable energy storage device, characterized in that: The portable energy storage device comprises: A housing component (10), the housing component (10) comprising a bottom housing (11) and a top housing (12) which are separately arranged in a first preset direction (f1); along the first preset direction (f1), the height of the bottom housing (11) is greater than the height of the top housing (12); and a connecting protrusion (111) is convexly provided on the inner wall surface of the bottom housing (11); the connecting protrusion (111) is provided with a receiving cavity (1111) and an opening (1112) communicating with the receiving cavity (1111); An energy storage module (20), the energy storage module (20) being arranged inside the bottom shell (11), the energy storage module (20) comprising an energy storage unit (21) and a fixing member (22) covering the outer periphery of the energy storage unit (21), the energy storage unit (21) being fixed inside the bottom shell (11) by the fixing member (22), the fixing member (22) being provided with a fixing portion (221), the fixing portion (221) being provided with a first through hole (222) penetrating along the first preset direction (f1); a connecting seat (30), the structural strength of the connecting seat (30) being different from the structural strength of the connecting protrusion (111), the connecting seat (30) being embedded in the accommodating cavity (1111) from the opening (1112); and, A connecting member (40), wherein the connecting member (40) passes through the first through hole (222) from top to bottom along the first preset direction (f1) and is connected to the connecting seat (30).

2. The portable energy storage device according to claim 1, characterized in that: The structural strength of the connecting seat (30) is greater than the structural strength of the connecting protrusion (111).

3. The portable energy storage device according to claim 1, characterized in that: The connecting member comprises a locking member, which passes through the first through hole (222) from top to bottom along the first preset direction (f1) and is screwed into the connecting seat (30).

4. The portable energy storage device according to claim 1, characterized in that: The opening (1112) is formed on the surface of the connecting protrusion (111) facing the energy storage module (20), and the top wall of the connecting protrusion (111) in the first preset direction (f1) is provided with a second through hole (1113) communicating with the accommodating cavity (1111) and the first through hole (222); The connecting member (40) passes through the first through hole (222) and the second through hole (1113) in sequence from top to bottom along the first preset direction (f1) and is connected to the connecting seat (30).

5. The portable energy storage device according to claim 4, characterized in that: A direction perpendicular to both the first preset direction (f1) and the opening direction (f2) of the opening (1112) is configured as a second preset direction (f3), wherein the opening direction (f2) is configured as a direction from the connecting protrusion (111) to the energy storage module (20); The connecting protrusion (111) comprises a first side wall (111a) and a second side wall (111b) which are arranged opposite to each other in a second preset direction (f3); the first side wall (111a) and / or the second side wall (111b) are provided with a limiting rib (112) which is located in the accommodating cavity (1111); the limiting rib (112) is in abutment with the connecting seat (30).

6. The portable energy storage device according to claim 5, characterized in that: There is a gap between the connecting seat (30) and the limiting rib (112) in the second preset direction (f3), and / or an adhesive layer bonded to both the connecting seat (30) and the limiting rib (112) is provided in the gap between the connecting seat (30) and the limiting rib (112) in the second preset direction (f3).

7. The portable energy storage device according to claim 4, characterized in that: A first supporting rib (113) located in the accommodating cavity (1111) is protruded from the bottom wall of the connecting protrusion (111) in the first preset direction (f1), and the first supporting rib (113) is in abutment with the connecting seat (30).

8. The portable energy storage device according to claim 4, characterized in that: A boss (114) extending along the first preset direction (f1) is protruded from the top wall of the connecting protrusion (111) in the first preset direction (f1); the boss (114) is located outside the accommodating cavity (1111), and the boss (114) and the inner wall surface of the bottom shell (11) are spaced apart; and the second through hole (1113) passes through the boss (114) along the first preset direction (f1).

9. The portable energy storage device according to claim 8, characterized in that: The boss (114) is provided with a plurality of first reinforcing ribs (115a) arranged at intervals along the circumference of the boss (114), and the first reinforcing ribs (115a) are connected to the outer circumferential surface of the boss (114) and the top wall of the connecting protrusion (111) in the first preset direction (f1).

10. The portable energy storage device according to claim 4, characterized in that: The top wall of the connecting protrusion (111) in the first preset direction (f1) is provided with a second reinforcing rib (115b) located outside the accommodating cavity (1111), and at least one of the second reinforcing ribs (115b) is connected to the inner wall surface of the bottom shell (11).

11. The portable energy storage device according to claim 1, characterized in that: The bottom wall of the connecting protrusion (114) in the first preset direction (f1) is provided with a second supporting rib (117) located outside the accommodating cavity (1111), the second supporting rib (117) is connected to the inner wall surface of the bottom shell (11), and the second supporting rib (117) extends along the first preset direction (f1) to connect to the inner bottom surface of the bottom shell (11).

12. The portable energy storage device according to claim 11, characterized in that: configuring a direction perpendicular to both the first preset direction (f1) and the opening direction (f2) of the opening (1112) as a second preset direction (f3); The second supporting rib (117) comprises at least two sub-supporting ribs (117a) arranged at intervals along the second preset direction (f3), and a plurality of connecting ribs (118) arranged at intervals along the first preset direction (f1) are connected between two adjacent sub-supporting ribs (117a).

13. The portable energy storage device according to any one of claims 1 to 12, characterized in that: One end of the bottom shell (11) close to the top shell (12) has a first stop surface (11a) abutting against the top shell (12), and one end of the top shell (12) close to the bottom shell (11) has a second stop surface (12a) abutting against the first stop surface (11a), and one of the first stop surface (11a) and the second stop surface (12a) is provided with a positioning protrusion (119), and the other of the first stop surface (11a) and the second stop surface (12a) is provided with a positioning groove (121), and the positioning protrusion (119) is embedded in the positioning groove (121).

14. The portable energy storage device according to claim 13, characterized in that: When the first stop surface (11a) is provided with a positioning protrusion (119), and the second stop surface (12a) is provided with a positioning groove (121), the positioning groove (121) passes through the inner wall surface of the top shell (12), and the inner wall surface of the top shell (12) is provided with a plurality of reinforcing ribs (122) arranged at intervals along the circumference of the top shell (12), and the reinforcing ribs (122) extend along the first preset direction (f1) until they abut against the positioning protrusion (119).

15. The portable energy storage device according to claim 14, characterized in that: The portable energy storage device (100) further comprises a circuit board assembly (50), wherein the circuit board assembly (50) is arranged inside the bottom shell (11), and the circuit board assembly (50) is located on one side of the energy storage module (20), and a reinforcement rib (122) arranged near the circuit board assembly (50) is provided with an avoidance notch (1221) for avoiding the circuit board assembly (50).

16. An energy storage system, characterized in that: The energy storage system comprises the portable energy storage device as described in any one of claims 1-15.

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