Energy storage apparatus and energy storage system

Abstract

An energy storage apparatus (100) and an energy storage system. The energy storage apparatus (100) comprises a housing assembly (10) and a battery (11), wherein the housing assembly (10) comprises a top housing (101), a middle housing (102), and a bottom housing (103), the middle housing (102) is located between the top housing (101) and the bottom housing (103), and connected to both the top housing (101) and the bottom housing (103); an air intake space is formed between the middle housing (102) and the top housing (101), an air exhaust space is formed between the middle housing (102) and the bottom housing (103), the top housing (101) is provided with an air intake vent (1011) in communication with the air intake space, the middle housing (102) is provided with an air supply port (1021) in communication with the air intake space and the air exhaust space, the bottom housing (103) is provided with an air exhaust vent (1031) in communication with the air exhaust space, and the battery (11) is arranged within the air exhaust space; the air supply port (1021) is provided with a fan assembly (12), the fan assembly (12) is configured for drawing external air into the air intake space by means of the air intake vent (1011), and the fan assembly (12) is further configured for blowing the external air in the air intake space toward the battery (11), and discharging the external air out of the air exhaust space by means of the air exhaust vent (1031).

Description

Energy storage device and energy storage system

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to Chinese Patent Application No. 202421463271.6, filed on June 24, 2024, which is incorporated by reference herein in its entirety. TECHNICAL FIELD

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

[0004] In the related art, a portable energy storage system generates a large amount of heat during charging and discharging, which causes the internal temperature of the portable energy storage system to rise. If the heat inside the portable energy storage system cannot be discharged in time, the battery may be in an unsuitable temperature environment, causing the battery performance to be unstable, and even leading to thermal runaway of the battery and even fire and explosion, affecting the service life and safety of the battery. SUMMARY

[0005] The energy storage device and the energy storage system provided by the embodiments of the present disclosure can achieve efficient heat dissipation, keep the temperature of the battery from being too high, and thus ensure stable working state of the battery and improve the reliability and stability of the working state of the battery.

[0006] To achieve the above-mentioned purpose, in a first aspect, the present disclosure provides an energy storage device, comprising:

[0007] a shell assembly, the shell assembly comprising a top shell, an intermediate shell and a bottom shell, the intermediate shell being located between the top shell and the bottom shell, the intermediate shell being connected with the top shell and the bottom shell respectively, and an air inlet space being formed between the intermediate shell and the top shell, an air outlet space being formed between the intermediate shell and the bottom shell, the top shell being provided with an air inlet opening in communication with the air inlet space, the intermediate shell being provided with an air outlet opening in communication with the air inlet space and the air outlet space, and the bottom shell being provided with an air outlet opening in communication with the air outlet space; and

[0008] a battery, the battery being built-in in the air outlet space;

[0009] The air outlet opening is provided with a fan assembly, the fan assembly being used for sucking external air into the air inlet space through the air inlet opening, and the fan assembly being further used for blowing the external air in the air inlet space towards the battery, and making the external air discharged to outside of the air outlet space through the air outlet opening.

[0010] In the energy storage device provided in the embodiment, the shell assembly includes a top shell, an intermediate shell and a bottom shell, the top shell is provided with an air inlet, the bottom shell is provided with an air outlet, the intermediate shell is connected between the top shell and the bottom shell, an air inlet space is formed between the intermediate shell and the top shell, an air outlet space is formed between the intermediate shell and the bottom shell, the intermediate shell is further provided with an air outlet opening communicating the air inlet space and the air outlet space, the battery is arranged in the air outlet space, and the fan assembly is arranged in the air outlet opening of the intermediate shell, so that the space above the intermediate shell (i.e. the air inlet space) can be used as the air inlet flow field of the fan assembly, and the space below the intermediate shell (i.e. the air outlet space) can be used as the air outlet flow field of the fan assembly, that is, when the fan assembly is working, the external air enters the air inlet space through the air inlet, is then blown to the battery under the action of the fan assembly to take away the heat of the battery, and is finally discharged to the outside of the air outlet space from the air outlet, in this process, the air in the air inlet space and the air outlet space is relatively closed, that is, the inlet and outlet flow fields of the fan assembly are in a completely isolated state, and the air in the air outlet space cannot flow into the air inlet space, so that the initial air temperature entering the air outlet space is not affected by the internal circulating air temperature, but can be close to the ambient temperature, that is, the temperature of the air contacting the battery can be close to the ambient temperature, so that the effective heat dissipation of the battery can be realized, the temperature of the battery is prevented from being too high, and the stable working state of the battery is ensured, and the reliability and stability of the working of the battery are improved.

[0011] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the top shell is provided with a power plug, the power plug is electrically connected with the battery through a bundle wire, the intermediate shell is further provided with a wire passing hole communicating the air inlet space and the air outlet space, the bundle wire is arranged in the wire passing hole, and a sealing ring is arranged between the bundle wire and the wire passing hole.

[0012] The power plug is arranged on the top shell, so that the power plug can be arranged close to the holding member, the distance between the holding member and the power plug can be arranged to be very close, compared with arranging the power plug on the bottom shell, since the power plug and the holding member are both arranged on the top shell, the distance between the two is closer, when the power cord is plugged in or pulled out, the force can be better exerted to pull out the power plug from the power plug or insert the power cord into the power plug. Meanwhile, the sealing ring is arranged between the bundle wire and the wire passing hole, the gap between the bundle wire and the wire passing hole can be sealed by the sealing ring, so as to prevent the air in the air outlet space from flowing into the air inlet space through the wire passing hole, so as to ensure that the initial air temperature entering the air outlet space is not affected by the internal circulating air temperature, but can be close to the ambient temperature, that is, the temperature of the air contacting the battery can be close to the ambient temperature, so that the effective heat dissipation of the battery can be realized, the temperature of the battery is prevented from being too high, and the stable working state of the battery is ensured, and the reliability and stability of the working of the battery are improved.

[0013] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the air inlet area of the air inlet is S1, the air outlet area of the air outlet is S2, S1 < S2, and / or 0.8 ≤ S1 / S2 ≤ 0.9. By making the air inlet area S1 of the air inlet slightly smaller than the air outlet area S2 of the air outlet, for example, the ratio of the air inlet area S1 of the air inlet to the air outlet area S2 of the air outlet is in the range of 0.8 to 0.9, so that the air inlet area S1 of the air inlet is close to the air outlet area S2 of the air outlet, that is, the air inlet area of the air inlet and the air outlet area of the air outlet are approximately equal, avoiding that the air inlet area is much smaller than the air outlet area, thereby appropriately increasing the air inlet area of the air inlet, so that the rate of air in the air outlet space discharged to the outside of the air outlet space through the air outlet can be ensured to avoid the heated air lingering around the battery while increasing the air inlet rate, thereby facilitating to improve the heat dissipation effect and ensure the service life and safety of the battery.

[0014] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the air inlet and the air outlet are located on the same side of the shell assembly, or the air inlet and the air outlet are located on two opposite sides of the shell assembly, respectively, or when the air inlet is one and the air outlet is at least two, at least one of the air outlets and the air inlet are located on the same side of the shell assembly, and at least one of the air outlets is located on the opposite side of the air inlet. Under the condition that the requirements of conditions and space are met, it is preferred to arrange the air outlet on the opposite side of the air inlet to ensure that the temperature of the external air passing through the air inlet is close to the ambient temperature, so that the temperature of the air in contact with the battery is close to the ambient temperature, thereby achieving effective heat dissipation of the battery to ensure the service life and safety of the battery.

[0015] As an optional implementation, in the embodiment of the first aspect of the present disclosure, when the air inlet and the air outlet are located on the same side of the shell assembly, the air outlet is located on the bottom of the bottom shell away from the top shell, and / or the distance between the air outlet and the bottom surface of the bottom shell along the height direction from the bottom shell to the top shell is d1, and the distance between the air inlet and the bottom surface of the bottom shell is d2, 2 / 25 ≤ d1 / d2 ≤ 7 / 25. By the above design, compared with arranging the air outlet on the position of the bottom shell close to the top shell, the distance between the air inlet and the air outlet can be farther, so as to avoid the hot air discharged through the air outlet rising to the air inlet and re-entering the air inlet, thereby ensuring that the temperature of the external air passing through the air inlet is close to the ambient temperature, so that the temperature of the air in contact with the battery is close to the ambient temperature, thereby achieving effective heat dissipation of the battery to ensure the service life and safety of the battery.

[0016] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the energy storage device further comprises a circuit board arranged in the air outlet space, the circuit board is located at one side of the battery in the width direction of the battery, and the circuit board is electrically connected with the battery, the circuit board has a heat concentration area, and the air outlet is arranged near the heat concentration area. When the holding part is held to lift the energy storage device, because the circuit board is located at one side of the battery, and the weight of the battery is much heavier than that of the circuit board, there is a large difference in weight between the two sides, so when the energy storage device is carried for walking, it will not scratch the user's legs, avoiding affecting walking; at the same time, the air outlet is arranged near the heat concentration area, so that the heat of the heat concentration area of the circuit board can quickly reach the outside of the bottom shell through the air outlet, thereby accelerating the heat dissipation of the heat concentration area of the circuit board, accelerating the heat dissipation rate of the circuit board, reducing the temperature of the circuit board, and increasing the service life of the circuit board. The heat concentration area of the circuit board is mainly the area where high-heat devices such as bidirectional voltage regulator, bidirectional isolator and AC-DC converter are concentrated.

[0017] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the energy storage device further comprises a circuit board arranged in the air outlet space, the circuit board is located at one side of the battery in the width direction of the battery, and the circuit board is electrically connected with the battery, the circuit board is provided with electronic components, and the electronic components include functional devices with a temperature higher than or equal to 110℃ in a running state; the energy storage device further comprises a heat dissipation fin, the heat dissipation fin is arranged on the side of the functional device away from the battery, and the heat dissipation fin is arranged in the axial direction of the fan assembly.

[0018] The heat dissipation fin is arranged on the side of the functional device away from the battery, that is, the area of the circuit board with high temperature, and local heat dissipation components are added, so that the functional devices with relatively high temperature in a running state can be quickly cooled, safety accidents can be avoided, and use safety can be improved; at the same time, the heat dissipation fin is arranged in the axial direction of the fan assembly, so that the extension direction of the heat dissipation fin can be consistent with the wind direction as much as possible, so that the gas flowing through the functional device (that is, the gas blown out by the fan assembly) can be effectively guided by the heat dissipation fin, so that the gas can fully exchange heat with the functional device, the heat dissipation effect of the functional device is improved, and the heat dissipation effect is better.

[0019] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the air outlet is arranged near the functional device, so that the gas exchanged with the functional device can be quickly discharged outside the bottom shell, avoiding long-term stay around the functional device to cause the functional device difficult to quickly cool down in a short time, so as to improve the heat dissipation effect of the fan assembly on the functional device.

[0020] As an optional implementation, in the embodiments of the first aspect of the present disclosure, the energy storage device further comprises a mainboard mounting member and a circuit mainboard arranged in the air outlet space, the mainboard mounting member is connected with the battery, and the mainboard mounting member is located at one side of the battery along the width direction of the battery, the circuit mainboard is mounted on the mainboard mounting member, and the circuit mainboard and the battery have a spacing therebetween, and the circuit mainboard is electrically connected with the battery. By arranging the mainboard mounting member, the circuit mainboard and the battery have a spacing therebetween, so that the battery can be provided with an expansion space to avoid being pressed to the circuit mainboard when the battery expands, thereby protecting the circuit mainboard.

[0021] Therefore, in the design of the present application, in order to avoid the battery from being pressed to the circuit mainboard when the battery expands, not only the first clamping member and the second clamping member are arranged to clamp the battery to reduce the expansion degree of the battery or prevent the battery from expanding, thereby avoiding the battery from being pressed to the circuit mainboard when the battery expands, but also the mainboard mounting member is further arranged to mount the circuit mainboard on the first clamping member by means of the mainboard mounting member, and the circuit mainboard is mounted and supported by means of the mainboard mounting member, so that there can be a spacing between the circuit mainboard and the first clamping member, thereby providing the battery with an expansion space, so that the battery can be better avoided from being pressed to the circuit mainboard when the battery expands, and the circuit mainboard can be better and more effectively protected.

[0022] As an optional implementation, in the embodiments of the first aspect of the present disclosure, the mainboard mounting member is a shell structure having a cavity, the circuit mainboard is mounted in the cavity of the mainboard mounting member, the mainboard mounting member is provided with a ventilation opening and a heat dissipation through hole in communication with the cavity, the ventilation opening is located on the top surface of the mainboard mounting member close to the fan assembly, the heat dissipation through hole includes a top heat dissipation hole and a bottom heat dissipation hole, the top heat dissipation hole is arranged adjacent to the ventilation opening, and the bottom heat dissipation hole is located at the bottom of the mainboard mounting member away from the fan assembly, and / or the heat dissipation through hole includes a first side heat dissipation hole and a second side heat dissipation hole, the first side heat dissipation hole and the air outlet are located on the same side of the shell assembly, and the second side heat dissipation hole is located on the opposite side of the air outlet.

[0023] Through the above design, the mainboard mounting member has a plurality of heat dissipation through holes, so that when the fan is started to dissipate heat of the electronic components, the gas can flow out from multiple directions to the outside of the mainboard mounting member, so that the flow rate of the gas can be improved, and the heat dissipation effect can be improved. At the same time, since the second side heat dissipation hole is located on the opposite side of the air outlet, and the bottom heat dissipation hole is closer to the air outlet than the second side heat dissipation hole, the local fluid flowing out from the second side heat dissipation hole can flow into the bottom heat dissipation hole after heat exchange with the bottom shell, and then flow out of the air outlet, thereby further reducing the fluid temperature of the bottom heat dissipation hole, so that the temperature of the electronic components on the circuit mainboard can be further reduced, and the heat dissipation effect is better.

[0024] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the top shell is provided with a power plug, the middle shell is further provided with a wire hole communicating with the air inlet space and the air outlet space, the energy storage device further comprises a wire harness, the wire harness is arranged in the wire hole, one end of the wire harness is electrically connected with the power plug, and the other end of the wire harness passes through the bottom heat dissipation hole and the second side heat dissipation hole into the cavity of the mainboard mounting piece to be electrically connected with the battery; in the length direction of the energy storage device, the length of the mainboard mounting piece is L0, the length of the bottom heat dissipation hole is L1, the length of the second side heat dissipation hole is L2, in the height direction of the energy storage device, the width of the mainboard mounting piece is D0, the width of the bottom heat dissipation hole is D1, and the width of the second side heat dissipation hole is D2, wherein 0.85≤L1 / L0≤0.95, 0.20≤L2 / L0≤0.30, 0.20≤D1 / D0≤0.30, and 0.45≤D2 / D0≤0.60.

[0025] When the bottom heat dissipation hole and the second side heat dissipation hole satisfy the above size relationship, the bottom heat dissipation hole and the second side heat dissipation hole can have a larger caliber, so as to avoid that the other end of the wire harness is blocked by the mainboard mounting piece when being inserted into the circuit mainboard from the bottom heat dissipation hole and the second side heat dissipation hole, thereby facilitating the insertion of the wire harness.

[0026] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the energy storage device further comprises a circuit mainboard and a heat insulation plate arranged in the air outlet space, the circuit mainboard is located on one side of the battery in the width direction of the battery, and the circuit mainboard is electrically connected with the battery, and the heat insulation plate is arranged between the circuit mainboard and the battery, so as to achieve the heat insulation effect, thereby reducing or avoiding the spread of heat generated by the battery in thermal runaway to the circuit mainboard, so as to avoid the spread of fire to the circuit mainboard when the battery catches fire; or, the heat insulation plate is used to weaken the heat transferred from the circuit mainboard to the battery, so as to avoid the thermal runaway and even the fire and explosion caused by the over-high temperature of the battery, thereby ensuring the service life and safety of the battery.

[0027] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the energy storage device further comprises a clamping assembly arranged in the air outlet space, the clamping assembly is connected with the middle shell, and the clamping assembly forms a clamping space, the battery is arranged in the clamping space, and the heat insulation plate is located between the circuit mainboard and the clamping assembly; the clamping assembly is made of metal, the heat insulation plate is provided with a avoiding gap, the avoiding gap is provided with a heat-conducting adhesive, and the heat-conducting adhesive is bonded between the circuit mainboard and the clamping assembly.

[0028] Through the above design, on the basis of weakening the heat transfer between the circuit mainboard and the battery, not only the battery can be clamped by the clamping assembly to reduce the expansion degree of the battery, but also the heat of the circuit mainboard can be conducted to the clamping assembly made of metal material by the heat-conducting glue, so as to diffuse the heat, thereby achieving better heat dissipation effect.

[0029] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the energy storage device further comprises a first clamping piece and a second clamping piece arranged in the air outlet space, the first clamping piece and the second clamping piece are respectively connected with the intermediate shell, and the first clamping piece and the second clamping piece are connected, and a clamping space is formed between the first clamping piece and the second clamping piece, and the battery is arranged in the clamping space.

[0030] On the basis of designing the shell assembly as a shell structure comprising a top shell, an intermediate shell and a bottom shell, the first clamping piece and the second clamping piece for clamping the battery are additionally arranged, so that not only the battery can be clamped by the first clamping piece and the second clamping piece to reduce the expansion degree of the battery, but also the battery can be connected with the intermediate shell through the first clamping piece and the second clamping piece. Compared with the mode in which the shell comprises a top shell and a bottom shell, an intermediate shell connected with the top shell is additionally arranged, and the first clamping piece, the second clamping piece and the bottom shell are respectively connected with the intermediate shell, so that the intermediate shell can bear part of the force of the top shell, i.e. the intermediate shell can share part of the force from the first clamping piece, the second clamping piece, the battery and the bottom shell, thereby avoiding all the weight being applied to the top shell to damage the top shell, increasing the structural strength of the top shell, and further improving the bearing capacity of the top shell when lifting the energy storage device, prolonging the service life of the top shell, and prolonging the service life of the shell assembly.

[0031] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the energy storage device further comprises a circuit mainboard arranged in the air outlet space, the circuit mainboard is located on one side of the battery in the width direction of the battery, and the circuit mainboard is electrically connected with the battery through a connecting tab; wherein the connecting tab comprises a first connecting portion, an elastic deformation portion and a second connecting portion connected in sequence, the first connecting portion is electrically connected with the pole of the battery, and the second connecting portion is electrically connected with the circuit mainboard.

[0032] Since there is a possibility and inevitable relative movement between the battery and the circuit mainboard during transportation, and since the connecting bar is connected between the battery and the circuit mainboard, when the battery and the circuit mainboard have relative movement, the connecting bar will be subjected to the pulling action of the battery and the circuit mainboard, and the connecting bar includes an elastic deformation part, which can adaptively deform when the connecting bar is subjected to the pulling action of the battery and the circuit mainboard, better absorb energy and impact, prevent damage to the welding position of the first connecting part and the battery, so that the welding position of the second connecting part and the circuit mainboard, thereby avoiding the occurrence of open circuit.

[0033] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the outer circumferential surface of the intermediate shell is provided with a stop protrusion, which is arranged circumferentially around the intermediate shell, wherein one end of the intermediate shell is embedded in the bottom shell, the stop protrusion is located outside the bottom shell, and the stop protrusion has a first stop surface arranged towards the bottom surface of the bottom shell, and the first stop surface abuts against the end surface of the bottom shell. One of the first stop surface and the end surface of the bottom shell is provided with a groove, and the other of the first stop surface and the end surface of the bottom shell is provided with a protruding part embedded in the groove.

[0034] Generally, when the energy storage device is placed on a placement plane (such as the ground, a table top, a countertop, etc.), the energy storage device is placed upright on the placement plane, that is, the bottom surface of the bottom shell is in contact with the placement plane, so the liquid on the shell assembly generally flows from top to bottom. For example, on a rainy day, rainwater falls and drips onto the top shell, and the rainwater on the top shell generally flows from top to bottom under the action of gravity. Even if the rainwater flows into the gap between the first stop surface and the end surface of the bottom shell, when the first stop surface is provided with a groove and the end surface of the bottom shell is provided with a protruding part embedded in the groove, since the protruding part is embedded in the groove, it forms an upward block, and the rainwater cannot flow upward along the protruding part under the action of gravity, thereby preventing the rainwater from entering the interior of the shell assembly to achieve a waterproof design. When the end surface of the bottom shell is provided with a groove and the first stop surface is provided with a protruding part embedded in the groove, even if the rainwater flows into the gap between the first stop surface and the end surface of the bottom shell, the rainwater will flow into the groove under the action of gravity, so that the rainwater is temporarily stored in the groove, thereby preventing the rainwater from entering the interior of the shell assembly to achieve a waterproof design.

[0035] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the first stop surface is provided with a groove, and the end surface of the bottom shell is provided with a protruding portion, the protruding portion has an inclined outer side surface, the inclined outer side surface and the end surface of the bottom shell are connected at an obtuse angle, and the groove has an inclined groove wall surface that is fitted with the inclined outer side surface. In this way, on the one hand, the climbing slope of external liquid can be increased, and the difficulty of external liquid entering the inside of the shell assembly through the protruding portion is increased, thereby further improving the waterproof performance of the shell assembly. On the other hand, during assembly, the protruding portion can be guided to be inserted into the groove by using the cooperation of the inclined outer side surface and the inclined groove wall surface, thereby facilitating the assembly between the intermediate shell and the bottom shell.

[0036] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the other end of the intermediate shell is embedded in the top shell, the stop protrusion is located between the top shell and the bottom shell, in the protruding direction of the stop protrusion relative to the outer circumferential surface of the intermediate shell, the outer circumferential surface of the stop protrusion is lower than the outer circumferential surface of the top shell, and the outer circumferential surface of the stop protrusion is lower than the outer circumferential surface of the bottom shell, and the connection between the outer circumferential surface of the bottom shell and the end surface of the bottom shell is provided with a chamfer.

[0037] When the energy storage device in the present application is placed outdoors and it rains, the rainwater will flow along the direction towards the bottom shell from the outer circumferential surface of the top shell, and when the rainwater flows to the edge of the top shell, because the outer circumferential surface of the intermediate shell is lower than the outer circumferential surface of the top shell, and the outer circumferential surface of the stop protrusion is lower than the outer circumferential surface of the bottom shell, the rainwater will directly drip to the outer circumferential surface of the bottom shell and continue to flow downward along the outer circumferential surface of the bottom shell under the action of gravity, or even if it drips on the end surface of the bottom shell, because of the existence of the protruding portion and the groove, the rainwater will not penetrate into the inside of the shell assembly from the connection between the top shell and the intermediate shell, and the connection between the bottom shell and the intermediate shell, and the existence of the chamfer or the rounded corner can guide the rainwater that drips on the end surface of the bottom shell to the outer circumferential surface of the bottom shell, so that the rainwater continues to flow downward along the outer circumferential surface of the bottom shell, thereby further improving the waterproof performance of the shell assembly.

[0038] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the shape of the intermediate shell is square, one end of the intermediate shell is embedded in the bottom shell, and the one end of the intermediate shell is provided with a plurality of spaced apart clamping blocks, the plurality of clamping blocks are arranged along the circumferential direction of the intermediate shell and are arranged on the outer circumferential surface of the intermediate shell, the inner side wall of the bottom shell is provided with a plurality of protruding blocks, the plurality of protruding blocks are arranged along the circumferential direction of the bottom shell, each protruding block is provided with a plug-in groove, and one clamping block is embedded in one plug-in groove, so as to realize the connection between the intermediate shell and the bottom shell, thereby facilitating the assembly and installation between the intermediate shell and the bottom shell.

[0039] As an optional implementation, in the embodiment of the first aspect of the present disclosure, the energy storage device further comprises a buffer member wrapped around the outer circumferential surface and the bottom surface of the battery, so that the buffer member can provide a certain buffering effect on the battery, avoiding hard contact between the battery and the bottom shell or between the battery and the clamping assembly, thereby reducing the risk of damage to the battery caused by direct action of the bottom shell or the clamping assembly on the battery, and protecting the battery.

[0040] In a second aspect, the present disclosure discloses an energy storage system having the energy storage device as described in the first aspect above. It can be understood that the energy storage system having the energy storage device as described in the first aspect also has all the beneficial effects of the energy storage device as described in the first aspect, i.e. the energy storage system having the energy storage device as described in the first aspect can also achieve efficient heat dissipation effect, keep the temperature of the battery from being too high, and thus ensure the stable working state of the battery and improve the reliability and stability of its work.

[0041] Compared with the prior art, the present disclosure has the beneficial effects that:

[0042] The energy storage device and the energy storage system provided by the embodiments of the present disclosure have the following beneficial effects: the shell assembly comprises a top shell, an intermediate shell and a bottom shell, the top shell is provided with an air inlet, the bottom shell is provided with an air outlet, the intermediate shell is connected between the top shell and the bottom shell, and an air inlet space is formed between the intermediate shell and the top shell, and an air outlet space is formed between the intermediate shell and the bottom shell, the intermediate shell is further provided with an air outlet opening communicating the air inlet space and the air outlet space, the battery is arranged in the air outlet space, and the fan assembly is arranged in the air outlet opening of the intermediate shell, so that the space above the intermediate shell (i.e. the air inlet space) can be used as the air inlet flow field of the fan assembly, and the space below the intermediate shell (i.e. the air outlet space) can be used as the air outlet flow field of the fan assembly, i.e. when the fan assembly works, the external air enters the air inlet space through the air inlet, and then is blown to the battery under the action of the fan assembly to take away the heat of the battery, and finally is discharged to the outside of the air outlet space through the air outlet, in this process, the path of the external air is: air inlet→air inlet space→fan assembly→air outlet space→air outlet, under the action of the fan assembly, the air in the air outlet space cannot return to the air inlet space from the air outlet opening, so that the air in the air inlet space and the air outlet space can be relatively closed, i.e. the inlet and outlet flow fields of the fan assembly are in a completely isolated state, and the air in the air outlet space cannot flow into the air inlet space, so as to ensure that the initial air temperature entering the air outlet space is not affected by the internal circulating air temperature, but can be close to the ambient temperature, i.e. the temperature of the air in contact with the battery can be close to the ambient temperature, thereby achieving effective heat dissipation of the battery, keeping the temperature of the battery from being too high, and thus ensuring the stable working state of the battery and improving the reliability and stability of its work. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following embodiments are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0044] Fig. 1 is a first structural schematic diagram of an energy storage device according to an embodiment of the present disclosure;

[0045] Fig. 2 is a second structural schematic diagram of an energy storage device according to an embodiment of the present disclosure;

[0046] Fig. 3 is a structural schematic diagram of the energy storage device in Fig. 2 from another perspective;

[0047] Fig. 4 is a sectional view of the energy storage device in Fig. 2 along the direction of A-A;

[0048] Fig. 5A is an exploded structural schematic diagram of the energy storage device in Fig. 2;

[0049] Fig. 5B is an exploded structural schematic diagram of the energy storage device in Fig. 2 from another perspective;

[0050] Fig. 6 is a side view of the energy storage device in Fig. 2;

[0051] Fig. 7 is a first exploded structural schematic diagram of a battery, a first clamping member, a second clamping member, a circuit main board, a main board mounting member and a heat insulation plate according to an embodiment of the present disclosure;

[0052] Fig. 8 is an exploded structural schematic diagram of Fig. 7 from another perspective;

[0053] Fig. 9 is a second exploded structural schematic diagram of a battery, a first clamping member, a second clamping member, a circuit main board, a main board mounting member and a heat insulation plate according to an embodiment of the present disclosure;

[0054] Fig. 10 is an exploded structural schematic diagram of a main board mounting member according to an embodiment of the present disclosure;

[0055] Fig. 11 is an exploded structural schematic diagram of a connecting tab according to an embodiment of the present disclosure;

[0056] Fig. 12 is a structural schematic diagram of a shell assembly according to an embodiment of the present disclosure;

[0057] Fig. 13 is an enlarged view of a portion M in Fig. 12;

[0058] Fig. 14 is a sectional view of the shell assembly in Fig. 12 along the direction of B-B;

[0059] Fig. 15 is an enlarged view of a portion N in Fig. 14;

[0060] Fig. 16 is a structural schematic diagram of an intermediate shell according to an embodiment of the present disclosure;

[0061] FIG. 17 is a structural schematic diagram of another perspective view of the middle shell according to an embodiment of the present disclosure;

[0062] FIG. 18 is a structural schematic diagram of the battery, the first clamping member, the second clamping member and the bottom shell according to an embodiment of the present disclosure.

[0063] Main reference signs 100 - energy storage device; 10 - housing assembly; 10a - air inlet space; 10b - air outlet space; 101 - top shell; 1011 - air inlet; 1012 - receiving groove; 1013 - power plug; 102 - middle shell; 102a - wire passing hole; 1021 - air outlet; 1022 - abutting protrusion; 1022a - first abutting surface; 1022b - groove; 1022c - inclined groove wall surface; 1023 - clamping block; 103 - bottom shell; 1031 - air outlet; 1032 - protruding part; 1032a - inclined outer side surface; 1033 - chamfer; 1034 - protruding block; 1034a - insertion slot; 1035 - reinforcing rib; 11 - battery; 11a - wire bundle; 12 - fan assembly; 13 - holding member; 14a - first clamping member; 14a1 - protruding column; 14b - second clamping member; 14c - clamping space; 15 - main circuit board; 151 - electronic component; 1511 - functional component; 152 - heat dissipation fin; 16 - main board mounting member; 161 - ventilation opening; 162 - heat dissipation through hole; 1621 - top heat dissipation hole; 1622 - bottom heat dissipation hole; 1623 - first side heat dissipation hole; 1624 - second side heat dissipation hole; 163 - wire slot; 164 - sleeve structure; 1641 - reinforcing rib; 17 - heat insulation plate; 171 - avoiding notch; 17a - heat conductive adhesive; 18 - connecting gasket; 181 - first connecting part; 182 - elastically deformed part; 183 - second connecting part; 19 - buffer member; f1 - length direction; f2 - width direction; f3 - height direction. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0066] It can be understood that the terms "first", "second" and the like used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first side heat dissipation hole can be referred to as the second side heat dissipation hole, and similarly, the second side heat dissipation hole can be referred to as the first side heat dissipation hole. Both the first side heat dissipation hole and the second side heat dissipation hole are side heat dissipation holes, but they are not the same side heat dissipation hole.

[0067] It can be understood that "connection" in the following embodiments should be understood as "electrical connection", "communication connection" and the like if the circuits, modules, units and the like connected to each other have transmission of electrical signals or data.

[0068] As used herein, the singular forms "a", "an" and "the" can also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprise / contain" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in the specification includes any and all combinations of the related listed items.

[0069] The portable energy storage system in the related art is usually a low-voltage designed battery system, and in the process of charging and discharging, the voltage can be boosted from 3.2V on the side of the battery cell to 220V on the side of alternating current, or reduced from 220V on the side of alternating current to 3.2V on the side of the battery cell, and in this process, a large amount of heat will be generated. The portable energy storage system in the related art is mostly cooled by air cooling, but in actual application, since the air inlet and air outlet of the fan share one outlet, and the air in contact with the battery cell is blown by the fan again, the temperature of the air in contact with the battery cell is high, and it is difficult to effectively cool the battery cell, which also causes the battery cell to have a high temperature, and cannot meet the requirement that the temperature rise is less than 25℃, that is, the battery cell may still be in an unsuitable environment, thereby causing unstable performance of the battery, and even causing thermal runaway of the battery, and even fire and explosion, which affects the service life and safety of the battery.

[0070] Therefore, the present application provides an energy storage device and an energy storage system capable of blowing air to the battery at a temperature close to the environment, so as to effectively and efficiently cool the battery.

[0071] The energy storage device and the energy storage system in the present application will be described in detail below with reference to the accompanying drawings.

[0072] Referring to FIGS. 1-4, the energy storage device 100 includes a housing assembly 10 and a battery 11, which is built in the housing assembly 10, so that the housing assembly 10 can be used to fix and protect the battery 11, so as to fix and protect the battery 11 and other electronic devices or structures arranged inside the housing under the action of external force, such as falling, knocking, and colliding, and can seal the battery 11 and other electronic devices or structures arranged inside the housing, so as to avoid the invasion of external moisture, dust and other impurities to the electronic devices or structures arranged inside the housing assembly 10.

[0073] Referring to FIGS. 4 and 5A, the housing assembly 10 in the present application includes a top shell 101, an intermediate shell 102 and a bottom shell 103, the intermediate shell 102 is located between the top shell 101 and the bottom shell 103, and the intermediate shell 102 is connected with the top shell 101 and the bottom shell 103 respectively, and the intermediate shell 102 and the top shell 101 form an air inlet space 10a, and the intermediate shell 102 and the bottom shell 103 form an air outlet space 10b. And the top shell 101 is provided with an air inlet 1011 which communicates with the air inlet space 10a, the intermediate shell 102 is provided with a air outlet 1021 which communicates with the air inlet space 10a and the air outlet space 10b, and the bottom shell 103 is provided with an air outlet 1031 which communicates with the air outlet space 10b, and the battery 11 is built in the air outlet space 10b. Among them, the air outlet 1021 of the intermediate shell 102 is installed with a fan assembly 12, which is used to suck the external air into the air inlet space 10a through the air inlet 1011, and the fan assembly 12 is also used to blow the external air in the air inlet space 10a to the battery 11, and make the external air exhaust to the outside of the air outlet space 10b through the air outlet 1031.

[0074] By setting the air inlet 1011 on the top shell 101, the air outlet 1031 on the bottom shell 103, and dividing the internal space of the shell assembly 10 into two relatively closed spaces by the middle shell 102, one of which is the air inlet space 10a and the other is the air outlet space 10b, specifically, the air inlet space 10a is formed between the middle shell 102 and the top shell 101, and the air outlet space 10b is formed between the middle shell 102 and the bottom shell 103, so that the air in the air inlet space 10a and the air outlet space 10b can be relatively closed under the action of the fan assembly 12, so that when the fan assembly 12 works, the external air enters the air inlet space 10a through the air inlet 1011, and then is blown to the battery 11 under the action of the fan assembly 12 to take away the heat of the battery 11, and finally is discharged to the outside of the air outlet space 10b from the air outlet 1031, in this process, the path of the external air is: air inlet 1011→air inlet space 10a→fan assembly 12→air outlet space 10b→air outlet 1031, under the action of the fan assembly 12, the air in the air outlet space 10b will not return to the air inlet space 10a from the air outlet, so that the air in the air inlet space 10a and the air outlet space 10b is relatively closed, that is, the inlet and outlet flow fields of the fan assembly 12 are in a completely isolated state, and the air in the air outlet space 10b will not flow into the air inlet space 10a, so as to ensure that the initial air temperature entering the air outlet space 10b will not be affected by the internal circulating air temperature, but can be close to the ambient temperature, that is, the temperature of the air in contact with the battery 11 can be close to the ambient temperature, so as to realize effective heat dissipation of the battery 11, keep the temperature of the battery 11 from being too high, and further ensure the stable working state of the battery 11, improve the reliability and stability of the working state of the battery 11.

[0075] For the convenience of description, the air inlet area of the air inlet 1011 is defined as S1, and the air outlet area of the air outlet 1031 is defined as S2. It can be understood that the above definition is only for the convenience of description, and should not limit the scope of the application.

[0076] In some optional embodiments, the air inlet area S1 of the air inlet 1011 is slightly smaller than the air outlet area S2 of the air outlet 1031. Optionally, 0.8≤S1 / S2≤0.9, for example, S1 / S2=0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, or 0.9, etc. By making the air inlet area S1 of the air inlet 1011 slightly smaller than the air outlet area S2 of the air outlet 1031, for example, the ratio of the air inlet area S1 of the air inlet 1011 and the air outlet area S2 of the air outlet 1031 is in the range of 0.8 to 0.9, so that the air inlet area S1 of the air inlet 1011 is close to the air outlet area S2 of the air outlet 1031, i.e., the area S1 of the air inlet 1011 and the air outlet area S2 of the air outlet 1031, avoiding that the area S1 of the air inlet 1011 is much smaller than the air outlet area S2 of the air outlet 1031, thereby appropriately increasing the air inlet area S1 of the air inlet 1011, so as to be able to ensure the rate of air in the air outlet space 10b passing through the air outlet 1031 to be discharged to the outside of the air outlet space 10b, while increasing the air inlet rate, thereby being beneficial to improving the heat dissipation effect and ensuring the service life and safety of the battery 11.

[0077] Optionally, the air inlet 1011 and the air outlet 1031 can each be one or more, and the shapes of the air inlet 1011 and the air outlet 1031 can each be a regular shape or an irregular shape, for example, the shapes of the air inlet 1011 and the air outlet 1031 can each be a circular shape, an elliptical shape, a triangular shape, a square shape, a rectangular shape, a diamond shape, or a trapezoidal shape, etc. The embodiments of the present application do not specifically limit the shapes of the air inlet 1011 and the air outlet 1031, and the shapes of the air inlet 1011 and the air outlet 1031 can each meet the appearance requirements and system wind resistance requirements.

[0078] Optionally, a waterproof and breathable film (not shown) can be arranged at the air inlet 1011 and the air outlet 1031, so that the air inside and outside the shell assembly 10 can flow through the air inlet 1011 and the air outlet 1031 to achieve the heat dissipation effect, and also can play a waterproof role, avoiding that the liquid from the outside enters the inside of the shell assembly 10 through the air inlet 1011 and the air outlet 1031 to cause the battery 11 to be short-circuited, thereby ensuring the use safety of the energy storage device 100 and the performance of the battery 11.

[0079] In the present application, the shape of the energy storage device 100 can be a square shape, the shape of the shell assembly 10 is a square shape, and the shape of the battery 11 is a square shape, for example, as shown in FIG. 5A, the shapes of the energy storage device 100, the shell assembly 10, and the battery 11 are all rectangular shapes, the battery 11 has a length direction f1, a width direction f2, and a height direction f3, and the height direction f3 is the direction from the bottom shell 103 to the top shell 101.

[0080] Referring to FIG. 5A, the energy storage device 100 in the application further comprises a holding member 13 connected with the top shell 101, so that the holding member 13 can be held to lift the energy storage device 100 for moving the energy storage device 100, thus making the movement of the energy storage device 100 more convenient. The top surface of the top shell 101 in the height direction f3 is provided with a receiving groove 1012, and the holding member 13 is at least partially received in the receiving groove 1012, and a holding space for the user to put his hand in to hold the holding member 13 is formed between the holding member 13 and the receiving groove 1012. In the height direction f3, the surface of the holding member 13 away from the top shell 101 is lower than or flush with the top surface of the top shell 101, so that when the shell assembly 10 is placed on a placing plane such as a table top, countertop, ground, etc., the shell assembly 10 can be placed upside down, i.e. the top surface of the top shell 101 can be placed on the placing plane, so that the energy storage device 100 can be placed upside down on the placing plane.

[0081] Preferably, the surface of the holding member 13 away from the top shell 101 is lower than the top surface of the top shell 101. Compared with the way that the surface of the holding member 13 away from the top shell 101 is flush with the top surface of the top shell 101, since it is difficult to keep the surface of the holding member 13 away from the top shell 101 absolutely flush with the top surface of the top shell 101, i.e. there is a height difference between the surface of the holding member 13 away from the top shell 101 and the top surface of the top shell 101, which affects the stability of the shell assembly 10 placed upside down on the placing plane, so that the surface of the holding member 13 away from the top shell 101 is lower than the top surface of the top shell 101, which improves the stability of the shell assembly 10 placed upside down on the placing plane.

[0082] Considering that the holding member 13 in the application is located on the top surface of the top shell 101, the air inlet 1011 is preferably arranged on the side wall of the top shell 101 in the width direction f2. In this way, when holding the holding member 13 to lift the energy storage device 100, on the one hand, the user's body and hands will not block the air inlet 1011, thus affecting the air inlet amount, which is conducive to ensuring the heat dissipation effect; on the other hand, since the holding member 13 is arranged on the top surface of the top shell 101, it occupies the space of the top surface of the top shell 101. If the air inlet 1011 is also arranged on the top surface of the top shell 101, the area of the top surface of the top shell 101 needs to be increased, which is not conducive to the miniaturization design of the energy storage device 100 in the application. Therefore, arranging the air inlet 1011 on the side wall of the top shell 101 is also conducive to the miniaturization design of the energy storage device 100.

[0083] In the present application, the air outlet 1031 and the air inlet 1011 can be located on the same side of the shell assembly 10; alternatively, the air outlet 1031 and the air inlet 1011 can be located on opposite sides of the shell assembly 10, i.e. the air outlet 1031 is located on the opposite side of the air inlet 1011; alternatively, at least one air outlet 1031 and the air inlet 1011 are located on the same side of the shell assembly 10, and at least one air outlet 1031 and the air inlet 1011 are located on opposite sides of the shell assembly 10, for example, as shown in FIGS. 2 and 3, the air inlet 1011 is located on the right side of the shell assembly 10, one air outlet 1031 is located on the right side of the shell assembly 10, and the other air outlet 1031 is located on the left side of the shell assembly 10.

[0084] The applicant has found that if the air outlet 1031 and the air inlet 1011 are located on the same side of the shell assembly 10, the air temperature entering from above will be affected by the air temperature discharged from below, so that the temperature of the external air entering through the air inlet 1011 is slightly higher than the ambient temperature. Therefore, under the condition that the conditions and space meet the requirements, it is preferred to arrange the air outlet 1031 on the opposite side of the air inlet 1011, so as to ensure that the temperature of the external air entering through the air inlet 1011 is close to the ambient temperature, thereby ensuring that the temperature of the air in contact with the battery 11 is close to the ambient temperature, and thus effectively cooling the battery 11 to ensure the service life and safety of the battery 11.

[0085] As shown in FIGS. 5A and 6, when the air inlet 1011 and the air outlet 1031 are located on the same side of the shell assembly 10, the air outlet 1031 is located on the bottom of the bottom shell 103 away from the top shell 101, and / or the distance between the air outlet 1031 and the bottom surface of the bottom shell 103 is d1, and the distance between the air inlet 1011 and the bottom surface of the bottom shell 103 is d2, 2 / 25≤d1 / d2≤7 / 25, for example, d1 / d2=2 / 25, 1 / 25, 3 / 25, 7 / 50, 4 / 25, 9 / 50, 1 / 5, 11 / 50, 6 / 25, 13 / 50 or 7 / 25, etc., so that the distance between the air inlet 1011 and the air outlet 1031 can be set very far. Through the above design, compared with arranging the air outlet 1031 on the position of the bottom shell 103 close to the top shell 101, the distance between the air inlet 1011 and the air outlet 1031 can be farther, so as to avoid the hot air discharged through the air outlet 1031 rising to the air inlet 1011 and re-entering the air inlet 1011, thereby ensuring that the temperature of the external air entering through the air inlet 1011 is close to the ambient temperature, thereby ensuring that the temperature of the air in contact with the battery 11 is close to the ambient temperature, and thus effectively cooling the battery 11 to ensure the service life and safety of the battery 11.

[0086] In some optional embodiments, as shown in FIGS. 4-7, the energy storage device 100 further comprises a clamping assembly arranged in the air outlet space 10b, the clamping assembly is connected with the intermediate shell 102, and the clamping assembly has a clamping space. Specifically, the clamping assembly comprises a first clamping piece 14a and a second clamping piece 14b, the first clamping piece 14a and the second clamping piece 14b are respectively connected with the intermediate shell 102, and the first clamping piece 14a and the second clamping piece 14b are connected, a clamping space 14c is formed between the first clamping piece 14a and the second clamping piece 14b, and the battery 11 is arranged in the clamping space 14c. On the basis of designing the shell assembly 10 as a shell structure comprising the top shell 101, the intermediate shell 102, and the bottom shell 103, the first clamping piece 14a and the second clamping piece 14b for clamping the battery 11 are additionally arranged, so that the battery 11 can be clamped by the first clamping piece 14a and the second clamping piece 14b to reduce the expansion degree of the battery 11, and the battery 11 can be connected with the intermediate shell 102 through the first clamping piece 14a and the second clamping piece 14b. Compared with the shell comprising the top shell 101 and the bottom shell 103, the intermediate shell 102 connected with the top shell 101 is additionally arranged, and the first clamping piece 14a, the second clamping piece 14b, and the bottom shell 103 are respectively connected with the intermediate shell 102, so that the intermediate shell 102 can bear part of the force of the top shell 101, i.e., the intermediate shell 102 can share part of the force of the first clamping piece 14a, the second clamping piece 14b, the battery 11, the bottom shell 103, and other components, so as to avoid all the weight being applied to the top shell 101 to cause damage to the top shell 101, increase the structural strength of the top shell 101, and thus improve the bearing capacity of the top shell 101 when the energy storage device 100 is lifted, prolong the service life of the top shell 101, and prolong the service life of the shell assembly 10.

[0087] Optionally, the battery 11 in the present application can be one, and the energy of the energy storage device 100 in the present application can be 1 KWH (1 degree of electricity), 2 KWH (2 degrees of electricity), 3 KWH (3 degrees of electricity), 4 KWH (4 degrees of electricity), 5 KWH (5 degrees of electricity), etc., i.e., the battery 11 in the present application can be a large-capacity battery 11, so that a single battery 11 can constitute an energy storage device 100 to realize independent charging and discharging, reduce the occupied space of the energy storage device 100, and thus enable the energy storage device 100 in the present application to adapt to more application scenarios, such as household energy storage and mobile power supply. Compared with the energy storage device 100 using multiple batteries 11, the cost is lower, so that families in energy-poor areas can afford and use it, and people in global energy-poor areas can also obtain affordable, reliable, and sustainable power sources to help improve the electricity for production and life in energy-poor areas. Wherein, “KWH” represents kilowatt-hour.

[0088] Exemplarily, when the energy storage device 100 in the present application is an energy storage device 100 with an energy of 1 kWh (1 degree of electricity), for energy-poor families, the energy storage device 100 of 1 degree of electricity in the present application can provide 80 hours of lighting or 16 hours of electric fan use, etc.; or, the energy storage device 100 of 1 degree of electricity in the present application can also promote small household businesses, such as supporting 80 hours of irrigation or 10 hours of sewing machine, etc., to continuously increase the income of the people in energy-poor areas and improve their lives; or, in terms of public health, the energy storage device 100 of 1 degree of electricity in the present application can also support small medical equipment, such as a small medical refrigerator, which can be used to store vaccines and medicines, and improve medical conditions.

[0089] Also because the battery 11 in the present application adopts a large-capacity battery, the expansion force of the battery 11 is usually greater than that of the plurality of small-capacity batteries 11 in the related art, so the first clamping member 14a and the second clamping member 14b are adopted to clamp the battery 11 to reduce the expansion degree of the battery 11, thereby facilitating the guarantee of the use performance of the battery 11, the improvement of the service life of the battery 11, and the reduction of the use safety hazards of the battery 11.

[0090] On this basis, in order to meet the requirement of large expansion force, the material of the first clamping member 14a and the second clamping member 14b is limited to metal, such as stainless steel, iron, aluminum, aluminum alloy, copper, copper alloy, etc. Compared with the case that the first clamping member 14a and the second clamping member 14b are plastic members, the hardness of the first clamping member 14a and the second clamping member 14b can reach the range of 150 HB to 220 HB, and the first clamping member 14a and the second clamping member 14b have strong resistance to deformation, and have better compression effect on the battery 11, so as to avoid the expansion of the battery 11, so as to guarantee the excellent use performance of the battery 11, improve the service life of the battery 11, and reduce the safety hazards. Wherein, "HB" represents Brinell hardness.

[0091] Please refer to FIGS. 5A to 7, the top shell 101 in the present application is provided with a power plug 1013, which is electrically connected with the battery 11 through the bundle wire 11a, so that the energy storage device 100 can be externally connected with a power source or electrically connected with a device to be charged through the power plug 1013 to realize charging and discharging. Exemplarily, as shown in FIGS. 2 and 3, the power plug 1013 can include three sub-power plugs 1013, one of which is used to realize the function of charging the device to be charged by the energy storage device 100; the remaining two are used to realize the function of charging the energy storage device 100, wherein one of the remaining two is a mains charging plug, and the other is a photovoltaic charging plug, which facilitates the charging and discharging of the energy storage device 100.

[0092] The power plug 1013 is arranged on the top shell 101, so that the power plug 1013 can be arranged close to the holding member 13, and the distance between the holding member 13 and the power plug 1013 can be arranged to be very close. Compared with arranging the power plug 1013 on the bottom shell 103, since the power plug 1013 and the holding member 13 are both located on the top shell 101, the distance between the two is closer, and when plugging or unplugging the power cord, the force can be better exerted to pull the power cord out of the power plug 1013 or insert the power cord into the power plug 1013.

[0093] Further, the intermediate shell 102 is further provided with a wire passing hole 102a which is in communication with the air inlet space 10a and the air outlet space 10b, the bundle wire 11a is arranged in the wire passing hole 102a, and one end of the bundle wire 11a is electrically connected to the power plug 1013, and the other end is electrically connected to the battery 11. And a sealing ring (not shown) is arranged between the bundle wire 11a and the wire passing hole 102a, so that the gap between the bundle wire 11a and the wire passing hole 102a can be sealed by the sealing ring, so as to avoid the air in the air outlet space 10b from flowing into the air inlet space 10a through the wire passing hole 102a, so as to ensure that the initial air temperature entering the air outlet space 10b will not be affected by the internal circulating air temperature, but can be close to the ambient temperature, that is, to ensure that the temperature of the air in contact with the battery 11 can be close to the ambient temperature, so as to achieve effective heat dissipation of the battery 11, and keep the temperature of the battery 11 from being too high, thereby ensuring the stable working state of the battery 11 and improving the reliability and stability of its work.

[0094] Optionally, the sealing ring can be, but is not limited to, a silica gel ring, a plastic ring, a rubber ring, a foam ring, etc.

[0095] Referring to FIGS. 4-7, the energy storage device 100 further comprises a circuit board 15 disposed in the air outlet space 10b, the circuit board 15 is located at one side of the battery 11 in the width direction f2 of the battery 11, and the circuit board 15 is electrically connected with the battery 11, wherein the other end of the wire harness is electrically connected with the circuit board 15, that is, the battery 11 and the other end of the wire harness are electrically connected through the circuit board 15, so that when discharging, the current output by the battery 11 is first transmitted to the circuit board 15, and then transmitted to the power plug 1013 through the wire harness, and finally transmitted to the device to be charged, so as to realize the discharging of the battery 11; and when charging, the external current is transmitted to the circuit board 15 through the power plug 1013 and the wire harness, and then transmitted to the battery 11, so as to realize the charging of the battery 11. Wherein, the circuit board 15 is provided with electronic components 151, which can be at least one of bidirectional voltage regulator, bidirectional isolator, AC / DC converter, control chip, control switch and sensor, but is not limited to. When holding the holding part 13 to lift the energy storage device 100, since the circuit board 15 is located at one side of the battery 11, and the weight of the battery 11 is much heavier than that of the circuit board 15, there is a big difference in weight between the two sides, so when walking with the energy storage device 100, the user's legs will not be scratched, avoiding affecting walking.

[0096] In the present application, the circuit board 15 can be used as a key component for monitoring, controlling and protecting the battery 11, wherein a battery management system (BMS) can be integrated. On the one hand, it can monitor and manage parameters such as voltage, temperature, state of charge and state of discharge of the battery 11, so as to avoid dangerous situations such as overcharging, overdischarging, overcurrent and short circuit, and ensure the safe operation of the battery cell and improve the working life of the battery cell; on the other hand, the energy storage device 100 based on the present application is a battery 11 system composed of a single battery 11, which is a low-voltage design, which can greatly improve the safety use coefficient of the operator and reduce the risk coefficient of the product in production and maintenance. At the same time, based on the voltage conversion circuit provided by the battery management system, the low-voltage battery 11 system can output high-voltage suitable for different application scenarios, that is, it can realize flexible voltage conversion while reducing the difficulty of operation.

[0097] For example, the circuit board 15 is provided with functional circuits with different functions. For example, bidirectional voltage conversion circuit (such as Buck / Boost circuit), bidirectional isolation circuit (such as LLC circuit) and AC / DC conversion circuit (such as CCM Totem-Pole, continuous conduction Totem-Pole) and the like. It can be understood that in actual use, the circuit board 15 can integrate different functional circuits in the circuit board 15 according to the application scenario of the energy storage device 100 to meet the application requirements.

[0098] The energy storage device 100 in the present application is a battery system composed of a single battery, which is a low-voltage design. Generally, the voltage value of a single battery 11 is relatively low, usually about 3.2V. Therefore, when the energy storage device 100 discharges, the voltage 3.2V DC output by the battery 11 will first be boosted to 310V DC through the bidirectional voltage converter on the circuit mainboard 15, and then be inverted to 220V AC through the AC-DC converter on the circuit mainboard 15, so as to meet the charging requirements of the equipment to be charged and realize the discharge of the energy storage device 100. When the energy storage device 100 charges, the external input 220V AC will first be inverted to 310V DC through the AC-DC converter on the circuit mainboard 15, and then be reduced to voltage 3.2V DC through the bidirectional voltage converter on the circuit mainboard 15, so as to meet the charging requirements of the battery 11 and realize the charging of the energy storage device 100.

[0099] In some optional embodiments, the circuit mainboard 15 has a heat concentration area, and the air outlet 1031 is arranged adjacent to the heat concentration area, so that the heat of the heat concentration area of the circuit mainboard 15 can quickly reach the outside of the bottom shell 103 through the air outlet 1031, thereby accelerating the heat dissipation of the heat concentration area of the circuit mainboard 15, speeding up the heat dissipation rate of the circuit mainboard 15, reducing the temperature of the circuit mainboard 15, and increasing the service life of the circuit mainboard 15. The heat concentration area of the circuit mainboard 15 is mainly the area where high-heat devices such as bidirectional voltage converters, bidirectional isolators, and AC-DC converters are concentratedly distributed.

[0100] In some optional embodiments, as shown in FIGS. 5A, 7 and 8, the electronic component 151 comprises a functional device 1511 with a temperature higher than or equal to 110°C in the running state, wherein the functional device 1511 can be, but is not limited to, at least one of a bidirectional voltage booster, a bidirectional isolator and an AC / DC converter, and the temperature of the functional device 1511 can be, but is not limited to, 110°C, 112°C, 114.4°C, 115°C, 115.4°C, 117.4°C, 118.06°C, 120°C, 120.9°C, 122.5°C, 123.09°C, 125.7°C, 129.06°C, 130°C, 130.5°C, 132.56°C, 134.5°C, 135.18°C, 137.6°C, 139.5°C, etc. The energy storage device 100 further comprises a heat dissipation fin 152 arranged on the side of the functional device 1511 away from the battery 11, and the heat dissipation fin 152 extends along the axial direction of the fan assembly 12. In the present application, the heat dissipation fin 152 is arranged on the side of the functional device 1511 away from the battery 11, i.e., the area with a high temperature of the circuit mainboard 15, and a local heat dissipation member is added to quickly dissipate heat of the functional device 1511 with a relatively high temperature in the running state, thereby avoiding safety accidents and improving the use safety. At the same time, the heat dissipation fin 152 is arranged to extend along the axial direction of the fan assembly 12, so that the extension direction of the heat dissipation fin 152 can be consistent with the wind direction as much as possible. In this way, the heat dissipation fin 152 can effectively guide the gas (i.e., the gas blown by the fan assembly) flowing through the functional device 1511, so that the gas can fully exchange heat with the functional device 1511, thereby improving the heat dissipation effect of the functional device 1511 and achieving better heat dissipation effect.

[0101] Optionally, the height of the heat dissipation fin 152 protruding relative to the circuit mainboard 15 is as high as possible to avoid that the flow field passing through the heat dissipation fin 152 is blocked by other devices on the circuit mainboard 15.

[0102] In some optional embodiments, the air outlet 1031 is arranged adjacent to the functional device 1511, in other words, the projection of the functional device 1511 on the side wall of the bottom shell 103 is at least partially located in the air outlet 1031. In this way, the gas exchanged with the functional device 1511 can be quickly discharged out of the bottom shell 103, thereby avoiding long-term stay around the functional device 1511 and causing the functional device 1511 difficult to quickly cool down in a short time. In this way, it is beneficial to improve the heat dissipation effect of the fan assembly 12 on the functional device 1511.

[0103] In some optional embodiments, as shown in FIGS. 5A, 7-9, the energy storage device 100 further comprises a mainboard mounting member 16 disposed in the air outlet space 10b, the mainboard mounting member 16 is connected with the battery 11, specifically, the mainboard mounting member 16 is connected with the first clamping member 14a, and the mainboard mounting member 16 is located on one side of the battery 11 along the width direction f2 of the battery 11. The circuit mainboard 15 is mounted on the mainboard mounting member 16, and there is a spacing between the circuit mainboard 15 and the battery 11. In this way, the expansion space can be provided for the battery 11 to avoid the battery 11 from pressing the circuit mainboard 15 when the battery 11 expands, thereby protecting the circuit mainboard 15.

[0104] Therefore, in the design of the present application, in order to avoid the battery 11 from pressing the circuit mainboard 15 when the battery 11 expands, not only the first clamping member 14a and the second clamping member 14b are arranged to clamp the battery 11 to reduce the expansion degree of the battery 11 or prevent the battery 11 from expanding, thereby avoiding the battery 11 from pressing the circuit mainboard 15 when the battery 11 expands, but further the mainboard mounting member 16 is additionally arranged to mount the circuit mainboard 15 on the first clamping member 14a by the mainboard mounting member 16, and the circuit mainboard 15 is mounted and supported by the mainboard mounting member 16, so that there is a spacing between the circuit mainboard 15 and the first clamping member 14a, and the expansion space is provided for the battery 11. In this way, the battery 11 can be better avoided from pressing the circuit mainboard 15 when the battery 11 expands, and the circuit mainboard 15 can be better and more effectively protected.

[0105] In some optional embodiments, the mainboard mounting member 16 can be a support column structure or a shell structure with a cavity, etc. When the mainboard mounting member 16 is a support column structure, the mainboard mounting member 16 is protruded from the surface of the first clamping member 14a away from the battery 11, and the circuit mainboard 15 is arranged on the end surface of the mainboard mounting member 16 away from the first clamping member 14a, so that there is a spacing between the circuit mainboard 15 and the first clamping member 14a. When the mainboard mounting member 16 is a shell structure with a cavity, the circuit mainboard 15 is mounted in the cavity of the mainboard mounting member 16, so that there is a spacing between the circuit mainboard 15 and the first clamping member 14a.

[0106] Preferably, the mainboard mounting member 16 is a shell structure with a cavity, which not only can make there be a spacing between the circuit mainboard 15 and the first clamping member 14a to avoid the battery 11 from pressing the circuit mainboard 15 when the battery 11 expands, but also can protect the circuit mainboard 15 from being pressed when the circuit mainboard 15 is externally pressed, thereby being conducive to ensuring the use performance and service life of the circuit mainboard 15.

[0107] When the mainboard mounting member 16 is a shell structure with a cavity, the application also intends to indicate that even if the battery 11 expands and the first clamping member 14a deforms, since the mainboard mounting member 16 is connected to the first clamping member 14a and the circuit mainboard 15 is mounted on the mainboard mounting member 16, when the battery 11 expands, the mainboard mounting member 16 will move in the expansion direction (outward) of the battery 11, and the circuit mainboard 15 will move outward together with the mainboard mounting member 16. In this way, the circuit mainboard 15 can maintain a certain distance with the mainboard mounting member 16 even when the battery 11 expands, so that the circuit mainboard 15 will not be squeezed even if the battery 11 expands. Moreover, usually, the side of the circuit mainboard 15 away from the first clamping member 14a is provided with electronic components 151. That is, the electronic components are located on the side of the circuit mainboard 15 facing the mainboard mounting member 16. In this way, when the battery 11 expands to a certain extent and cannot squeeze the bottom shell 103, and the distance between the first clamping member 14a and the circuit mainboard 15 is shortened, even if it is squeezed, it is the side of the circuit mainboard 15 without electronic components 151, so that the electronic components 151 on the circuit mainboard 15 can be further effectively protected.

[0108] Please refer to FIG. 7 and FIG. 8, the mainboard mounting member 16 in the application is provided with a ventilation opening 161 and a heat dissipation through hole 162 which are in communication with the cavity, and the ventilation opening 161 is located on the top surface of the mainboard mounting member 16 close to the fan assembly 12. Among them, the heat dissipation through hole 162 includes a top heat dissipation hole 1621 and a bottom heat dissipation hole 1622, the top heat dissipation hole 1621 is arranged close to the ventilation opening 161, and the bottom heat dissipation hole 1622 is located on the bottom of the mainboard mounting member 16 away from the fan assembly 12; and / or, the heat dissipation through hole 162 includes a first side heat dissipation hole 1623 and a second side heat dissipation hole 1624, the first side heat dissipation hole 1623 and the second side heat dissipation hole 1624 are respectively located on the two sides of the mainboard mounting member 16 along the length direction f1 of the battery 11, and the first side heat dissipation hole 1623 and the air outlet 1031 are located on the same side of the shell assembly 10, and the second side heat dissipation hole 1624 is located on the opposite side of the air outlet 1031.

[0109] Specifically, when the fan assembly 12 is started, external air enters the air inlet space 10a from the air inlet 1011 under the action of the fan assembly 12, and then enters the cavity of the mainboard mounting member 16 through the air vent 161 under the action of the fan assembly 12 to blow to and flow through the electronic components 151, thereby taking away the heat of the electronic components 151, and then being discharged to the outside of the mainboard mounting member 16 from the top heat dissipation hole 1621, the bottom heat dissipation hole 1622, or the first side heat dissipation hole 1623 and the second side heat dissipation hole 1624, or from the top heat dissipation hole 1621, the bottom heat dissipation hole 1622, the first side heat dissipation hole 1623 and the second side heat dissipation hole 1624, and finally being discharged to the outside of the bottom shell 103 from the air outlet 1031, thereby achieving the heat dissipation effect.

[0110] Through the above design, the mainboard mounting member 16 has a plurality of heat dissipation through holes 162, so that when the fan is started to dissipate heat from the electronic components 151, the gas can flow out from multiple directions to the outside of the mainboard mounting member 16, thereby improving the flow rate of the gas and improving the heat dissipation effect. At the same time, since the second side heat dissipation hole 1624 is located on the opposite side of the air outlet 1031, and the bottom heat dissipation hole 1622 is closer to the air outlet 1031 than the second side heat dissipation hole 1624, the local fluid flowing out of the second side heat dissipation hole 1624 can flow into the bottom heat dissipation hole 1622 after heat exchange with the bottom shell 103, and then flow out of the air outlet 1031, thereby further reducing the temperature of the fluid flowing out of the bottom heat dissipation hole 1622, and further reducing the temperature of the electronic components 151 on the circuit board 15, thereby improving the heat dissipation effect.

[0111] Optionally, the electronic components 151 with relatively large heat generation, such as the electronic components 151 with a temperature higher than or equal to 110°C in the running state, have a projection on the mainboard mounting member 16 at least partially located in the top heat dissipation hole 1621, so that the heat of the electronic components 151 with relatively large heat generation can be quickly discharged to the outside of the mainboard mounting member 16, thereby improving the heat dissipation efficiency. In addition, the top heat dissipation hole 1621 is a heat dissipation hole structure with an internal complete hollow, rather than a heat dissipation hole structure with a plurality of intersecting ribs arranged inside to divide the inside into a plurality of small heat dissipation holes, or a heat dissipation hole structure formed by a plurality of small heat dissipation holes arranged at intervals. In this way, the top heat dissipation hole 1621 has a larger heat dissipation area, and can more quickly discharge the heat of the electronic components 151 with relatively large heat generation to the outside of the mainboard mounting member 16, thereby further improving the heat dissipation efficiency.

[0112] In some optional embodiments, the outer surface of the mainboard mounting member 16 is provided with a wire slot 163, and the wire harness connected between the circuit mainboard 15 and the power plug 1013 is arranged in the wire slot 163. Thus, the wire harness can be bound and guided by the wire slot 163, so that the layout of the wire harness can be more compact, thereby avoiding the problems of disordered, cross-distributed and intertwined wire harnesses, and thus facilitating the reduction of the occupation of the internal space of the shell by the wire harness.

[0113] Further, the bottom heat dissipation hole 1622 and the second side heat dissipation hole 1624 can also be used for the wire harness to pass into the cavity of the mainboard mounting member 16. That is, one end of a part of the wire harness can pass through the bottom heat dissipation hole 1622 into the cavity of the mainboard mounting member 16 to be electrically connected with the circuit mainboard 15 (e.g., the first conductive protrusion on the circuit mainboard 15), and one end of another part of the wire harness can pass through the second side heat dissipation hole 1624 into the cavity of the mainboard mounting member 16 to be electrically connected with the circuit mainboard 15 (e.g., the second conductive protrusion on the circuit mainboard 15).

[0114] In some embodiments, in the length direction of the energy storage device, the length of the mainboard mounting member 16 is L0, the length of the bottom heat dissipation hole 1622 is L1, and the length of the second side heat dissipation hole 1624 is L2; in the height direction of the energy storage device, the width of the mainboard mounting member 16 is D0, the width of the bottom heat dissipation hole 1622 is D1, and the width of the second side heat dissipation hole 1624 is D2, wherein 0.85≤L1 / L0≤0.95, for example, L1 / L0=0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94 or 0.95; 0.20≤L2 / L0≤0.30, for example, L2 / L0=0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29 or 0.30; 0.20≤D1 / D0≤0.30, for example, D2 / D0=0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29 or 0.30; 0.45≤D2 / D0≤0.60, for example, D2 / D0=0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59 or 0.60. When the bottom heat dissipation hole 1622 and the second side heat dissipation hole 1624 satisfy the above size relationship, the bottom heat dissipation hole 1622 and the second side heat dissipation hole 1624 can have a larger caliber, so as to avoid the problem that the other end of the wire harness is blocked by the mainboard mounting member 16 when being inserted into the circuit mainboard 15 from the bottom heat dissipation hole 1622 and the second side heat dissipation hole 1624, thereby facilitating the insertion of the wire harness.

[0115] In some optional embodiments, as shown in FIGS. 8 and 10, the middle part of the first clamping member 14a can be provided with a protruding column 14a1, and the circuit board 15 is provided with a connecting hole, and the protruding column 14a1 is arranged in the connecting hole on the circuit board 15. Since during assembly, the circuit board 15 is usually first installed to the main board mounting member 16, and then the whole of the circuit board 15 and the main board mounting member 16 is assembled to the first clamping member 14a, thus, when the circuit board 15 and the main board mounting member 16 are assembled to the first clamping member 14a, the assembly of the whole of the circuit board 15 and the main board mounting member 16 can be positioned by the cooperation of the protruding column 14a1 and the connecting hole, so as to facilitate the assembly between the whole of the circuit board 15 and the main board mounting member 16 and the first clamping member 14a.

[0116] Further, the protruding column 14a1 can be connected with the inner wall surface of the main board mounting member 16 through the connecting hole, so that the middle part of the main board mounting member 16 can be supported by the protruding column 14a1, the load bearing capacity of the main board mounting member 16 is improved, so as to avoid the circuit board 15 and the battery 11 from being extruded when being extruded from outside, thereby protecting the circuit board 15 and the battery 11.

[0117] In some optional embodiments, the main board mounting member 16 is provided with a sleeve structure 164 in the cavity of the main board mounting member 16, and the protruding column 14a1 on the first clamping member 14a is arranged in the hollow part of the sleeve structure 164, so as to realize the connection between the protruding column 14a1 and the main board mounting member 16, thereby improving the connection stability and installation convenience between the protruding column 14a1 and the main board mounting member 16.

[0118] Optionally, the outer circumferential surface of the sleeve structure 164 is provided with a plurality of reinforcing ribs 1641, and the plurality of reinforcing ribs 1641 are arranged in the cavity of the main board mounting member 16 along the circumferential direction of the sleeve structure 164 and connected with the inner wall surface of the main board mounting member 16 respectively. The arrangement of the reinforcing ribs 1641 can further enhance the structural strength of the main board mounting member 16 and improve the load bearing capacity of the main board mounting member 16, so as to avoid the circuit board 15 and the battery 11 from being extruded when being extruded from outside, thereby protecting the circuit board 15 and the battery 11.

[0119] In some optional embodiments, as shown in FIGS. 5A, 7 and 8, the energy storage device 100 further comprises a heat insulation plate 17 arranged in the air outlet space 10b, which is arranged between the circuit main board 15 and the battery 11, specifically between the circuit main board 15 and the first clamping member 14a. In this way, the heat insulation effect can be achieved to reduce or avoid the spread of heat generated by the battery 11 in thermal runaway to the circuit main board 15, thereby avoiding the spread of fire to the circuit main board 15 when the battery 11 catches fire. Alternatively, the heat insulation plate 17 can be used to weaken the heat transferred from the circuit main board 15 to the battery 11, so as to avoid the situation that the battery 11 overheats and causes thermal runaway and even fire and explosion, thereby ensuring the service life and safety of the battery 11.

[0120] It can be understood that the temperature of the circuit main board 15 and the battery 11 can be controlled by adjusting the size of the heat insulation plate 17. For example, if it is desired to further reduce the temperature of the battery 11 when the temperature of the circuit main board 15 is relatively low, the area of the heat insulation plate 17 can be increased to block the airflow heated after passing through the circuit main board 15 and prevent the heated airflow from bypassing the battery 11 and then flowing out from the air outlet 1031 of the bottom shell 103.

[0121] For example, the heat insulation plate 17 can be a mica plate or a metal plate coated with a heat insulation coating. The use of the above heat insulation plate 17 can better prevent the spread of heat from one battery 11 in thermal runaway to the circuit main board 15, and the heat insulation effect is better. In addition, the mica plate can also prevent electrical breakdown and prevent damage to the circuit main board 15. The heat insulation coating can mainly consist of thermal insulation materials such as, but not limited to, glass fiber, asbestos, rock wool, silicate, aerogel felt, vacuum plate, etc., which have good heat insulation ability and can prevent heat exchange between the battery 11 and the circuit main board 15.

[0122] In some optional embodiments, the clamping assembly is made of metal, i.e., the first clamping member 14a and the second clamping member 14b are made of metal, and the heat insulation plate 17 is provided with a heat conduction gap 171 provided with a heat conduction adhesive 17a bonded between the circuit main board 15 and the first clamping member 14a of the clamping assembly. Through the above design, on the basis of weakening the heat transfer between the circuit main board 15 and the battery 11, the first clamping member 14a and the second clamping member 14b can be used to clamp the battery 11 to reduce the expansion degree of the battery 11, and the heat conduction adhesive 17a can be used to conduct the heat of the circuit main board 15 to the first clamping member 14a and the second clamping member 14b made of metal, so as to diffuse the heat, thereby achieving a better heat dissipation effect.

[0123] In some optional embodiments, as shown in FIGS. 5A and 11, the circuit board 15 is electrically connected with the battery 11 through the connecting tab 18. When discharging, the current output by the battery 11 is first transmitted to the circuit board 15 through the connecting tab 18, and then transmitted to the power plug 1013 through the bundle wire, and finally transmitted to the device to be charged, so as to realize the discharging of the battery 11. When charging, the external current is transmitted to the circuit board 15 through the power plug 1013 and the bundle wire, and then transmitted to the battery 11 through the connecting tab 18, so as to realize the charging of the battery 11. The connecting tab 18 includes a first connecting portion 181, an elastic deformation portion 182 and a second connecting portion 183 connected in sequence. The first connecting portion 181 is electrically connected with the pole of the battery 11, and the second connecting portion 183 is electrically connected with the circuit board 15.

[0124] During transportation, the relative motion between the battery 11 and the circuit board 15 may exist inevitably. Since the connecting tab 18 is connected between the battery 11 and the circuit board 15, when the relative motion between the battery 11 and the circuit board 15 occurs, for example, the motion of the battery 11 relative to the circuit board 15 or the motion of the circuit board 15 relative to the battery 11, the connecting tab 18 will be subjected to the pulling action of the battery 11 and the circuit board 15. The connecting tab 18 includes the elastic deformation portion 182, which can adaptively deform when subjected to the pulling action of the battery 11 and the circuit board 15, better absorb energy and impact, and prevent the damage to the welding positions of the first connecting portion 181 and the battery 11 and the welding positions of the second connecting portion 183 and the circuit board 15, thereby avoiding the open circuit.

[0125] In some optional embodiments, as shown in FIGS. 12 to 15, the outer circumferential surface of the middle shell 102 is provided with a stop protrusion 1022 which is arranged along the circumference of the middle shell 102. One end of the middle shell 102 is embedded in the bottom shell 103, and the stop protrusion 1022 is located outside the bottom shell 103. The stop protrusion 1022 has a first stop surface 1022a which is arranged on the bottom surface of the stop protrusion 1022 and faces the bottom shell 103. The first stop surface 1022a abuts against the end surface of the bottom shell 103. One of the first stop surface 1022a and the end surface of the bottom shell 103 is provided with a groove 1022b, and the other is provided with a protrusion 1032. That is, when the first stop surface 1022a is provided with the groove 1022b, the end surface of the bottom shell 103 is provided with the protrusion 1032. When the first stop surface 1022a is provided with the protrusion 1032, the end surface of the bottom shell 103 is provided with the groove 1022b, and the protrusion 1032 is embedded in the groove 1022b.

[0126] Generally, when the energy storage device 100 is placed on a placement plane (e.g. the ground, a table top, a counter top, etc.), the energy storage device 100 is placed right side up on the placement plane, i.e. the bottom surface of the bottom case 103 is in contact with the placement plane, so the liquid on the housing assembly 10 generally flows from top to bottom, for example, when it is raining, the rain falls and drips onto the top case 101, the rain on the top case 101 generally flows from top to bottom under the action of gravity. Even if the rain flows into the gap between the first stop surface 1022a and the end surface of the bottom case 103, but the first stop surface 1022a is provided with a groove 1022b, and the end surface of the bottom case 103 is provided with a protrusion 1032 embedded in the groove 1022b, when the bottom case is in contact with the placement plane to place the energy storage device right side up, the protrusion 1032 can form an upward block, the rain cannot flow upward along the protrusion 1032 under the action of gravity, thereby preventing the rain from entering the interior of the housing assembly 10, achieving a waterproof design; when the top case is in contact with the placement plane to place the energy storage device upside down, even if the rain flows into the gap between the first stop surface 1022a and the end surface of the bottom case 103, but the rain will flow into the groove 1022b under the action of gravity, so the rain is temporarily stored in the groove 1022b, thereby preventing the rain from entering the interior of the housing assembly 10, achieving a waterproof design. In the case where the end surface of the bottom case 103 is provided with a groove 1022b, and the first stop surface 1022a is provided with a protrusion 1032 embedded in the groove 1022b, when the bottom case is in contact with the placement plane to place the energy storage device right side up, even if the rain flows into the gap between the first stop surface 1022a and the end surface of the bottom case 103, but the rain will flow into the groove 1022b under the action of gravity, so the rain is temporarily stored in the groove 1022b, thereby preventing the rain from entering the interior of the housing assembly 10, achieving a waterproof design; when the top case is in contact with the placement plane to place the energy storage device upside down, the protrusion 1032 can form an upward block, the rain cannot flow upward along the protrusion 1032 under the action of gravity, thereby preventing the rain from entering the interior of the housing assembly 10, achieving a waterproof design.

[0127] As shown in FIG. 15, when the first stop surface 1022a is provided with a groove 1022b, and the end surface of the bottom shell 103 is provided with a protrusion 1032, the protrusion 1032 has an inclined outer side surface 1032a, the inclined outer side surface 1032a and the end surface of the bottom shell 103 are connected at an obtuse angle, the groove 1022b has an inclined groove wall surface 1022c which is in contact with the inclined outer side surface 1032a, in this way, on the one hand, the climbing slope of the external liquid can be increased, and the difficulty of the external liquid entering the inside of the shell assembly 10 over the protrusion 1032 is increased, so as to further improve the waterproof performance of the shell assembly 10; on the other hand, in assembly, the protrusion 1032 can be guided to be inserted into the groove 1022b by using the cooperation of the inclined outer side surface 1032a and the inclined groove wall surface 1022c, so as to facilitate the assembly between the intermediate shell 102 and the bottom shell 103.

[0128] In some optional embodiments, as shown in FIG. 14 and FIG. 15, the other end of the intermediate shell 102 is embedded in the top shell 101, the stop protrusion 1022 is located between the top shell 101 and the bottom shell 103, in the protruding direction of the stop protrusion 1022 relative to the outer peripheral surface of the intermediate shell 102, the outer peripheral surface of the stop protrusion 1022 is lower than the outer peripheral surface of the top shell 101, and the outer peripheral surface of the stop protrusion 1022 is lower than the outer peripheral surface of the bottom shell 103, and the connection between the outer peripheral surface of the bottom shell 103 and the end surface of the bottom shell 103 is provided with a chamfer 1033, such as an inverted bevel or an inverted round corner.

[0129] When the energy storage device 100 in the present application is placed outdoors and it rains, the rainwater will flow along the direction towards the bottom shell 103 from the outer peripheral surface of the top shell 101, and when the rainwater flows to the edge of the top shell 101, since the outer peripheral surface of the intermediate shell 102 is lower than the outer peripheral surface of the top shell 101, and the outer peripheral surface of the stop protrusion 1022 is lower than the outer peripheral surface of the bottom shell 103, the rainwater will flow over the stop protrusion 1022 under the action of gravity, directly drop onto the outer peripheral surface of the bottom shell 103 and continue to flow downward along the outer peripheral surface of the bottom shell 103, or even if it drops on the end surface of the bottom shell 103, since the protrusion 1032 exists, the rainwater will not penetrate into the inside of the shell assembly 10 from the connection between the top shell 101 and the intermediate shell 102, and the connection between the bottom shell 103 and the intermediate shell 102, and moreover, the existence of the inverted bevel or the inverted round corner can guide the rainwater which drops on the end surface of the bottom shell 103 to the outer peripheral surface of the bottom shell 103, so as to make the rainwater continue to flow downward along the outer peripheral surface of the bottom shell 103, so as to further improve the waterproof performance of the shell assembly 10.

[0130] In some optional embodiments, as shown in FIGS. 16, 17 and 18, the intermediate shell 102 is square in shape, and a plurality of clamping blocks 1023 are arranged on one end of the intermediate shell 102 and arranged on the outer circumferential surface of the intermediate shell 102 along the axial direction of the intermediate shell 102. The inner side wall of the bottom shell 103 is provided with a plurality of protrusions 1034 arranged along the circumferential direction of the bottom shell 103, and each protrusion 1034 is provided with a plug-in slot 1034a. One clamping block 1023 is embedded in one plug-in slot 1034a to realize the connection between the intermediate shell 102 and the bottom shell 103, so that the assembly and installation of the intermediate shell 102 and the bottom shell 103 can be facilitated.

[0131] Optionally, the bottom of each protrusion 1034 is connected with a plurality of reinforcing ribs 1035 arranged along the circumferential direction of the bottom shell 103 and protruding on the inner side wall of the bottom shell 103, so that the structure of the protrusion 1034 can be reinforced by the plurality of reinforcing ribs 1035.

[0132] In some optional embodiments, as shown in FIG. 18, the energy storage device further comprises a buffer 19 wrapped around the outer circumferential surface and the bottom surface of the battery 11, so that the buffer 19 can have a certain buffering effect on the battery 11, avoiding the hard contact between the battery 11 and the bottom shell 103 or the hard contact between the battery 11 and the clamping assembly (i.e., the first clamping member 14a and the second clamping member 14b), thereby reducing the risk of damage to the battery 11 caused by the direct action of the bottom shell 103 or the clamping assembly on the battery 11, and protecting the battery.

[0133] Specifically, when the battery 11 is directly arranged on the bottom shell 103, the buffer 19 is located between the battery 11 and the bottom shell 103, so that the hard contact between the battery 11 and the bottom shell 103 can be avoided, and the risk of damage to the battery 11 caused by the direct action of the bottom shell 103 on the battery 11 can be reduced, thereby protecting the battery. When the battery 11 is arranged on the bottom shell 103 through the clamping assembly, the buffer 19 is located between the battery 11 and the clamping assembly, so that the hard contact between the battery 11 and the clamping assembly can be avoided, and the risk of damage to the battery 11 caused by the direct action of the clamping assembly on the battery 11 can be reduced, thereby protecting the battery.

[0134] For example, the buffer 19 can be a silica gel piece, a rubber piece, a plastic piece, a foam piece, or the like.

[0135] The energy storage system disclosed in the embodiments of the present disclosure also discloses an energy storage system having the energy storage device as described in any of the preceding embodiments. It can be understood that the energy storage system having the energy storage device described above can have the same or similar beneficial effects as the energy storage device, and specific descriptions can be referred to the description of the embodiments of the energy storage device, which will not be repeated here.

[0136] In practical application, the energy storage system can be a portable energy storage system, which can be conveniently moved to a target location according to an actual application location.

[0137] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0138] In addition, the above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the content of the present description should not be understood as a limitation on the present application, and the protection scope of the present application should be subject to the appended claims.

Claims

1. An energy storage device, comprising: A housing assembly includes a top shell, a middle shell, and a bottom shell. The middle shell is located between the top shell and the bottom shell, and is connected to both the top shell and the bottom shell. An air inlet space is formed between the middle shell and the top shell, and an air outlet space is formed between the middle shell and the bottom shell. The top shell has an air inlet communicating with the air inlet space, the middle shell has an air outlet communicating with both the air inlet space and the air outlet space, and the bottom shell has an air outlet communicating with the air outlet space. A battery, which is built into the air outlet space; The air outlet is equipped with a fan assembly, which is used to draw outside air into the air intake space through the air inlet, and the fan assembly is also used to blow the outside air in the air intake space toward the battery, and to discharge the outside air out of the air outlet through the air outlet.

2. The energy storage device according to claim 1, wherein, The top casing is equipped with a power plug, which is electrically connected to the battery via a cable harness; wherein... The intermediate housing is also provided with a wire passage hole that communicates with the air inlet space and the air outlet space. The wire bundle passes through the wire passage hole, and a sealing ring is provided between the wire bundle and the wire passage hole.

3. The energy storage device according to any one of the preceding claims, wherein, The air inlet area is S1, and the air outlet area is S2, where S1 < S2, and / or 0.8 ≤ S1 / S2 ≤ 0.

9.

4. The energy storage device according to any one of the preceding claims, wherein, The air inlet and the air outlet are located on the same side of the housing assembly, or the air inlet and the air outlet are located on two opposite sides of the housing assembly, or when there is one air inlet and at least two air outlets, at least one air outlet and the air inlet are located on the same side of the housing assembly, and at least another air outlet is located on the opposite side of the air inlet.

5. The energy storage device according to claim 4, wherein, The air inlet and the air outlet are located on the same side of the housing assembly, and the air outlet and the air inlet are configured according to at least one of the following: The air outlet is located at the bottom of the bottom shell, away from the top shell, or Along the height direction from the bottom shell to the top shell, the distance between the air outlet and the bottom surface of the bottom shell is d1, and the distance between the air inlet and the bottom surface of the bottom shell is d2, where 2 / 25≤d1 / d2≤7 / 25.

6. The energy storage device according to any one of the preceding claims, wherein, The energy storage device also includes a circuit board disposed in the air outlet space. The circuit board is located on one side of the battery in its width direction and is electrically connected to the battery. The circuit board has a heat concentration area, and the air outlet is disposed adjacent to the heat concentration area.

7. The energy storage device according to any one of the preceding claims, wherein, The energy storage device also includes a circuit board disposed in the air outlet space. The circuit board is located on one side of the battery in its width direction and is electrically connected to the battery. The circuit board is provided with electronic components, including functional devices with a temperature higher than or equal to 110°C in the operating state. The energy storage device further includes heat dissipation fins, which are disposed on the side of the functional device facing away from the battery and extend along the axial direction of the fan assembly.

8. The energy storage device according to claim 7, wherein, The air outlet is located near the functional device.

9. The energy storage device according to any one of the preceding claims, wherein, The energy storage device further includes a mainboard mounting component and a circuit board disposed within the air outlet space. The mainboard mounting component is connected to the battery and is located on one side of the battery along its width. The mainboard mounting component is a housing structure with a cavity. The circuit board is installed in the cavity of the mainboard mounting component, and there is a gap between the circuit board and the battery. The circuit board is electrically connected to the battery. The motherboard mounting component is provided with a ventilation opening and a heat dissipation hole communicating with the cavity. The ventilation opening is located on the top surface of the motherboard mounting component near the fan assembly, and the heat dissipation hole is configured according to at least one of the following: The heat dissipation holes include top heat dissipation holes and bottom heat dissipation holes. The top heat dissipation holes are located near the vent, and the bottom heat dissipation holes are located at the bottom of the motherboard mounting component away from the fan assembly. The heat dissipation holes include a first side heat dissipation hole and a second side heat dissipation hole. The first side heat dissipation hole and the air outlet are located on the same side of the housing assembly, and the second side heat dissipation hole is located on the opposite side of the air outlet.

10. The energy storage device according to claim 9, wherein, The top shell is provided with a power plug, and the middle shell is also provided with a cable passage hole communicating with the air inlet space and the air outlet space. The energy storage device also includes a cable bundle, which passes through the cable passage hole. One end of the cable bundle is electrically connected to the power plug, and the other end of the cable bundle passes through the bottom heat dissipation hole and the second side heat dissipation hole to enter the cavity of the motherboard mounting component to be electrically connected to the battery. In the length direction of the energy storage device, the length of the motherboard mounting component is L0, the length of the bottom heat dissipation hole is L1, and the length of the second side heat dissipation hole is L2. In the height direction of the energy storage device, the width of the motherboard mounting component is D0, the width of the bottom heat dissipation hole is D1, and the width of the second side heat dissipation hole is D2, wherein 0.85≤L1 / L0≤0.95, 0.20≤L2 / L0≤0.30, 0.20≤D1 / D0≤0.30, and 0.45≤D2 / D0≤0.

60.

11. The energy storage device according to any one of the preceding claims, wherein, The energy storage device also includes a circuit board and a heat insulation plate disposed in the air outlet space. The circuit board is located on one side of the battery in its width direction and is electrically connected to the battery. The heat insulation plate is disposed between the circuit board and the battery.

12. The energy storage device according to claim 11, wherein, The energy storage device further includes a clamping assembly disposed in the air outlet space. The clamping assembly is connected to the intermediate shell and forms a clamping space. The battery is built into the clamping space, and the heat insulation plate is located between the circuit board and the clamping assembly. The clamping assembly is made of metal, the heat insulation plate has a clearance notch, the clearance notch is provided with thermally conductive adhesive, and the thermally conductive adhesive is bonded between the circuit board and the clamping assembly.

13. The energy storage device according to any one of the preceding claims, wherein, The energy storage device further includes a first clamping member and a second clamping member disposed in the air outlet space. The first clamping member and the second clamping member are respectively connected to the intermediate shell, and the first clamping member and the second clamping member are connected to each other. A clamping space is formed between the first clamping member and the second clamping member, and the battery is built into the clamping space.

14. The energy storage device according to any one of the preceding claims, wherein, The energy storage device further includes a circuit board disposed within the air outlet space. The circuit board is located on one side of the battery in its width direction, and the circuit board is electrically connected to the battery via a connecting tab. The connecting plate includes a first connecting part, an elastic deformation part, and a second connecting part connected in sequence. The first connecting part is electrically connected to the terminal of the battery, and the second connecting part is electrically connected to the circuit board.

15. The energy storage device according to any one of the preceding claims, wherein, The outer peripheral surface of the intermediate shell is provided with a stop protrusion, which is arranged around the circumference of the intermediate shell. One end of the intermediate shell is embedded in the bottom shell, the stop protrusion is located outside the bottom shell, and the stop protrusion has a first stop surface facing the bottom surface of the bottom shell, which abuts against the end face of the bottom shell. One of the first stop surface and the end face of the bottom shell is provided with a groove, and the other of the first stop surface and the end face of the bottom shell is provided with a protrusion, which is embedded in the groove.

16. The energy storage device according to claim 15, wherein, The first stop surface is provided with a groove, and when the end face of the bottom shell is provided with a protrusion, the protrusion has an inclined outer side surface, the inclined outer side surface and the end face of the bottom shell are connected at an obtuse angle, and the groove has an inclined groove wall surface that fits with the inclined outer side surface.

17. The energy storage device according to claim 15, wherein, The other end of the intermediate shell is embedded in the top shell. The stop protrusion is located between the top shell and the bottom shell. In the protruding direction of the stop protrusion relative to the outer peripheral surface of the intermediate shell, the outer peripheral surface of the stop protrusion is lower than the outer peripheral surface of the top shell, and the outer peripheral surface of the stop protrusion is lower than the outer peripheral surface of the bottom shell. A chamfer is provided at the connection between the outer peripheral surface of the bottom shell and the end face of the bottom shell.

18. The energy storage device according to any one of the preceding claims, wherein, The intermediate shell is square in shape. One end of the intermediate shell is embedded in the bottom shell, and one end of the intermediate shell has a plurality of spaced-apart locking blocks. The plurality of locking blocks are arranged along the circumference of the intermediate shell on its outer circumference. The inner sidewall of the bottom shell has a plurality of protrusions. The plurality of protrusions are arranged along the circumference of the bottom shell. Each protrusion has a insertion groove, and a locking block is embedded in one insertion groove.

19. The energy storage device according to any one of the preceding claims, wherein, The energy storage device also includes a buffer element, which is wrapped around the outer peripheral surface and bottom surface of the battery.

20. An energy storage system, characterized in that, The energy storage system has an energy storage device as described in any one of claims 1 to 19.

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