Energy storage device and energy storage system

Abstract

The utility model discloses an energy storage device and an energy storage system, the energy storage device comprises a shell assembly and a battery, the shell assembly comprises a top shell, a middle shell and a bottom shell, the middle shell is located between the top shell and the bottom shell, the middle shell is respectively connected with the top shell and the bottom shell, an air inlet space is formed between the middle shell and the top shell, and the battery is arranged in the middle shell. An air inlet space is formed between the middle shell and the bottom shell, an air outlet space is formed between the middle shell and the bottom shell, the top shell is provided with an air inlet communicated with the air inlet space, the middle shell is provided with an air supply outlet communicated with the air inlet space and the air outlet space, the bottom shell is provided with an air outlet communicated with the air outlet space, and the battery is arranged in the air outlet space; wherein the air supply outlet is provided with a fan assembly, the fan assembly is used for sucking external air into the air inlet space through the air inlet, and the fan assembly is further used for blowing the external air in the air inlet space to the battery and discharging the external air out of the air outlet space through the air outlet.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to an energy storage device and an energy storage system. Background Art

[0002] The portable energy storage system in the related technology will generate a large amount of heat during the charging and discharging process, and will cause 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 placed in an environment with inappropriate temperature, resulting in unstable battery performance, and even causing serious consequences such as thermal runaway of the battery and even fire and explosion, affecting the service life and safety of the battery. Utility Model Content

[0003] The utility model discloses an energy storage device and an energy storage system, which can achieve efficient heat dissipation effect, keep the temperature of the battery from being too high, thereby ensuring a stable working state of the battery and improving the reliability and stability of its operation.

[0004] In order to achieve the above objectives, in a first aspect, the utility model discloses an energy storage device, comprising:

[0005] A housing assembly, the housing assembly comprising a top housing, an intermediate housing and a bottom housing, the intermediate housing being located between the top housing and the bottom housing, the intermediate housing being connected to the top housing and the bottom housing respectively, an air inlet space being formed between the intermediate housing and the top housing, an air outlet space being formed between the intermediate housing and the bottom housing, the top housing being provided with an air inlet communicating with the air inlet space, the intermediate housing being provided with an air supply port communicating with the air inlet space and the air outlet space, and the bottom housing being provided with an air outlet communicating with the air outlet space; and

[0006] A battery, wherein the battery is built into the air outlet space;

[0007] Among them, the air supply outlet is installed with a fan assembly, which is used to suck the outside air into the air inlet space through the air inlet, and the fan assembly is also used to blow the outside air in the air inlet space toward the battery, and make the outside air be discharged to the outside of the air outlet space through the air outlet.

[0008] In the energy storage device provided in this embodiment, its shell assembly includes a top shell, an intermediate shell and a bottom shell, wherein 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 also provided with an air supply port connecting 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 supply port of the intermediate shell, so that the upper space of the intermediate shell (i.e., the air inlet space) can be used as the air inlet flow domain of the fan assembly, and the lower space of the intermediate shell (i.e., the air outlet space) can be used as the air outlet flow domain of the fan assembly, that is, when the fan assembly is working, the outside air passes through The air enters the air inlet space, and then is blown toward the battery under the action of the fan assembly to take away the heat of the battery, and finally is discharged from the air outlet to the outside of the air outlet space. 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 will not flow into the air inlet space, so as to ensure that the initial wind temperature entering the air outlet space will not be affected by the internal circulating wind temperature, but can be close to the ambient temperature, that is, to ensure that the temperature of the air in contact with the battery can be close to the ambient temperature, so as to achieve effective heat dissipation of the battery, keep the battery temperature not too high, thereby ensuring the stable working state of the battery and improving its working reliability and stability.

[0009] As an optional implementation, in an embodiment of the first aspect of the utility model, the top shell is provided with a power plug, and the power plug is electrically connected to the battery through a wiring harness; wherein, the intermediate shell is also provided with a wire passing hole connected to the air inlet space and the air outlet space, the wire harness is passed through the wire passing hole, and a sealing ring is provided between the wire harness and the wire passing hole.

[0010] The power plug is arranged on the top shell so that the power plug can be arranged close to the grip so that the distance between the grip and the power plug can be arranged very close. Compared with the case where the power plug is arranged on the bottom shell, since the power plug and the grip are both located on the top shell, the distance between the two parts is closer. When plugging and unplugging the power cord, better force can be applied to pull the power plug out of the power plug or insert the power cord into the power plug. At the same time, a sealing ring is provided between the wire harness and the wire through hole. The sealing ring can be used to seal the gap between the wire harness and the wire through hole to prevent the air in the air outlet space from flowing into the air inlet space through the wire through hole, so as to ensure that the initial air temperature entering the air outlet space 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 can be close to the ambient temperature, so as to achieve effective heat dissipation of the battery and keep the battery temperature from being too high, thereby ensuring the stable working state of the battery and improving its working reliability and stability.

[0011] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, the air inlet area of the air inlet is S1, and the air outlet area of the air outlet is S2, where S1 < S2, and / or, S1 / S2 = 0.8 - 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 0.8 - 0.9, the air inlet area S1 of the air inlet is made close to the air outlet area S2 of the air outlet, that is, the area of the air inlet and the air outlet area of the air outlet, to avoid the situation where the area of the air inlet is much smaller than the air outlet area of the air outlet, thereby appropriately increasing the air inlet area of the air inlet, so as to ensure the rate at which the air in the air outlet space is discharged to the outside of the air outlet space through the air outlet, to avoid the heated air lingering around the battery while increasing the air inlet rate, which is conducive to improving the heat dissipation effect and ensuring the service life and safety of the battery.

[0012] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, 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 respectively 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 of the air outlets and the air inlet are located on the same side of the housing assembly, and at least the other air outlet is located on the opposite side of the air inlet. Under the condition that the conditions and space meet the requirements, it is preferably to set the air outlet on the opposite side of the air inlet to ensure that the temperature of the outside air passing through the air inlet can be close to the ambient temperature, so as to ensure that the temperature of the air in contact with the battery can be close to the ambient temperature, and thus can effectively dissipate the heat of the battery to ensure the service life and safety of the battery.

[0013] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, when the air inlet and the air outlet are located on the same side of the housing assembly, the air outlet is located at the bottom of the bottom case away from the top case, and / or, in the height direction pointing from the bottom case to the top case, the distance between the air outlet and the bottom surface of the bottom case is d1, and the distance between the air inlet and the bottom surface of the bottom case is d2, where d1 / d2 = 2 / 25 - 7 / 25. Through the above design, compared with setting the air outlet at the position of the bottom case close to the top case, the distance between the air inlet and the air outlet can be farther, to avoid the situation where the hot air discharged through the air outlet rises to the air inlet and re-enters the air inlet, so as to ensure that the temperature of the outside air passing through the air inlet can be close to the ambient temperature, so as to ensure that the temperature of the air in contact with the battery can be close to the ambient temperature, and thus can effectively dissipate the heat of the battery to ensure the service life and safety of the battery.

[0014] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, the energy storage device further includes a circuit main board disposed in the air outlet space. The circuit main board is located on one side of the battery in its width direction, and the circuit main board is electrically connected to the battery. The circuit main board has a heat concentration area, and the air outlet is disposed adjacent to the heat concentration area. When holding the holding member to lift the energy storage device, since the circuit main board is located on one side of the battery and the weight of the battery is much heavier than that of the circuit main board, there is a large difference in weight between the two sides. Therefore, when carrying the energy storage device while walking, it will not rub against the user's leg, avoiding affecting walking. At the same time, the air outlet is disposed adjacent to the heat concentration area, enabling the heat in the heat concentration area of the circuit main board to quickly reach the outside of the bottom case through the air outlet, thereby accelerating the heat dissipation of the heat concentration area of the circuit main board, increasing the heat dissipation rate of the circuit main board, reducing the temperature of the circuit main board, and increasing the service life of the circuit main board. Among them, the heat concentration area of the circuit main board is mainly the area where high-heat-generating devices such as bidirectional buck-boost converters, bidirectional isolators, and AC-DC converters are concentratedly distributed.

[0015] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, the energy storage device further includes a circuit main board disposed in the air outlet space. The circuit main board is located on one side of the battery in its width direction, and the circuit main board is electrically connected to the battery. The circuit main board is provided with electronic components, and the electronic components include functional devices whose temperature is higher than or equal to 110 °C in the operating state; the energy storage device further includes heat dissipation fins, and the heat dissipation fins are disposed on the side of the functional device facing away from the battery and extend along the axial direction of the fan assembly.

[0016] In this application, heat dissipation fins are disposed on the side of the functional device facing away from the battery, that is, for the area with a high temperature of the circuit main board, a heat dissipation component is locally added, which can quickly dissipate heat from the functional device with a relatively high temperature in the operating state, avoiding safety accidents and improving the use safety. At the same time, the heat dissipation fins are also arranged to extend along the axial direction of the fan assembly, so that the extending direction of the heat dissipation fins can be as consistent with the wind direction as possible. In this way, the heat dissipation fins can effectively guide the gas flowing through the functional device (that is, the gas blown out by the wind assembly), enabling the gas to fully exchange heat with the functional device and improving the heat dissipation effect of the functional device, having a better heat dissipation effect.

[0017] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, the air outlet is disposed adjacent to the functional device, so that the gas that exchanges heat with the functional device can be quickly discharged outside the bottom case, avoiding staying around the functional device for a long time, which may cause the functional device to be difficult to quickly cool down in a short time. This is beneficial to improving the heat dissipation effect of the fan assembly on the functional device.

[0018] As an alternative implementation, in the embodiment of the first aspect of the present utility model, the energy storage device further includes a main board mounting member and a circuit main board disposed in the air outlet space. The main board mounting member is connected to the battery, and the main board mounting member is located on one side of the battery along its width direction. The circuit main board is mounted on the main board mounting member, and there is a spacing between the circuit main board and the battery. The circuit main board is electrically connected to the battery. By providing the main board mounting member, a spacing is provided between the circuit main board and the battery, so as to provide an expansion space for the battery to avoid the circuit main board being squeezed when the battery expands, thereby protecting the circuit main board.

[0019] Therefore, in the design of the present application, in order to avoid the circuit main board being squeezed when the battery expands, not only the first clamping member and the second clamping member are provided to clamp the battery to reduce the expansion degree of the battery or prevent the battery from expanding, so as to avoid the circuit main board being squeezed when the battery expands; but also a main board mounting member is further added to mount the circuit main board on the first clamping member through the main board mounting member, and the main board mounting member is used to mount and support the circuit main board, so that a spacing can exist between the circuit main board and the first clamping member to provide an expansion space for the battery, so as to better avoid the circuit main board being squeezed when the battery expands and provide better and more effective protection for the circuit main board.

[0020] As an alternative implementation, in the embodiment of the first aspect of the present utility model, the main board mounting member is a housing structure with a cavity. The circuit main board is mounted in the cavity of the main board mounting member. The main board mounting member is provided with a ventilation port and heat dissipation through holes communicating with the cavity. The ventilation port is located on the top surface of the main board mounting member close to the fan assembly; the heat dissipation through holes include a top heat dissipation hole and a bottom heat dissipation hole. The top heat dissipation hole is disposed adjacent to the ventilation port, and the bottom heat dissipation hole is located at the bottom of the main board mounting member away from the fan assembly; and / or, the heat dissipation through 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 on the same side of the housing assembly, and the second side heat dissipation hole is on the opposite side of the air outlet.

[0021] Through the above design, the motherboard mounting member has a plurality of heat dissipation through holes, so that when the fan is started to dissipate heat from the electronic components, the gas can flow out to the outside of the motherboard mounting member from multiple directions, thereby improving the gas flow rate and the heat dissipation effect. At the same time, since the second side heat dissipation holes are located on the opposite side of the air outlet, and the bottom heat dissipation holes are closer to the air outlet than the second side heat dissipation holes, part of the fluid flowing out from the second side heat dissipation holes flows into the bottom heat dissipation holes after heat exchange with the bottom case, and then flows out to the air outlet, which can further reduce the fluid temperature of the bottom heat dissipation holes, so that the temperature of the electronic components on the circuit motherboard can be further reduced, and the heat dissipation effect is better.

[0022] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the top case is provided with a power plug, the intermediate case is further provided with a wire passing hole communicating with the air inlet space and the air outlet space, the energy storage device further includes a wire bundle, the wire bundle passes through the wire passing hole, and one end of the wire bundle is electrically connected to the power plug, and the other end of the wire bundle passes through the bottom heat dissipation hole and the second side heat dissipation hole and enters the cavity of the motherboard mounting member to be electrically connected to the battery; in the length direction of the energy storage device, the length of the motherboard mounting member 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 member is D0, the width of the bottom heat dissipation hole is D1, and the width of the second side heat dissipation hole is D2, where L1 / L0 = 0.85 - 0.95, L2 / L0 = 0.20 - 0.30, D1 / D0 = 0.20 - 0.30, D2 / D0 = 0.45 - 0.60.

[0023] 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 diameter, avoiding being blocked by the motherboard mounting member when inserting the other end of the wire bundle into the circuit motherboard through the bottom heat dissipation hole and the second side heat dissipation hole, so as to facilitate the insertion of the wire bundle.

[0024] As an optional implementation manner, in the embodiment of the first aspect of the present invention, the energy storage device further includes a circuit motherboard and a heat insulation plate disposed in the air outlet space. The circuit motherboard is located on one side of the battery in its width direction, and the circuit motherboard is electrically connected to the battery. The heat insulation plate is disposed between the circuit motherboard and the battery, so as to achieve a heat insulation effect, reduce or avoid the heat generated by the battery during thermal runaway from spreading to the circuit motherboard, thereby avoiding the fire spreading to the circuit motherboard when the battery catches fire; or, use the heat insulation plate to weaken the heat transferred from the circuit motherboard to the battery, so as to avoid the battery temperature being too high and resulting in thermal runaway or even fire and explosion, etc., thereby ensuring the service life and safety of the battery.

[0025] As an optional embodiment, in an embodiment of the first aspect of the utility model, the energy storage device also includes a clamping assembly arranged in the air outlet space, the clamping assembly is connected to the intermediate shell, and the clamping assembly forms a clamping space, the battery is built into the clamping space, and the heat insulation plate is located between the circuit main board and the clamping assembly; the material of the clamping assembly is metal, the heat insulation plate is provided with an avoidance gap, the avoidance gap is provided with thermal conductive glue, and the thermal conductive glue is bonded between the circuit main board and the clamping assembly.

[0026] Through the above design, on the basis of weakening the heat transfer between the circuit main board and the battery, not only can the battery be clamped by the clamping assembly to reduce the expansion of the battery, but also the heat of the circuit main board can be transferred to the metal clamping assembly by thermal conductive adhesive, so as to diffuse the heat and achieve better heat dissipation effect.

[0027] As an optional embodiment, in an embodiment of the first aspect of the utility model, the energy storage device also includes a first clamping member and a second clamping member arranged 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, a clamping space is formed between the first clamping member and the second clamping member, and the battery is built into the clamping space.

[0028] On the basis of designing the outer shell assembly as a shell structure including a top shell, an intermediate shell and a bottom shell, a first clamping member and a second clamping member for clamping the battery are additionally provided, so that not only the first clamping member and the second clamping member can be used to clamp the battery to reduce the expansion degree of the battery, but also the battery can be connected to the intermediate shell through the first clamping member and the second clamping member. Compared with the method in which the outer shell includes a top shell and a bottom shell, an additional intermediate shell connected to the top shell is additionally provided, and the first clamping member, the second clamping member and the bottom shell and other components are respectively connected to the intermediate shell, so that the intermediate shell can bear a part of the force of the top shell, that is, the intermediate shell can share a part of the force from the first clamping member, the second clamping member, the battery, the bottom shell and other components, so as to avoid all the weight being applied to the top shell and causing damage to the top shell, thereby increasing the structural strength of the top shell, and thus improving the bearing capacity of the top shell when lifting the energy storage device, thereby improving the service life of the top shell and the service life of the outer shell assembly.

[0029] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, the energy storage device further includes a circuit main board disposed in the air outlet space. The circuit main board is located on one side of the battery in its width direction, and the circuit main board is electrically connected to the battery through a connecting tab; wherein, the connecting tab includes a first connecting portion, an elastic deformation portion, and a second connecting portion connected in sequence. The first connecting portion is electrically connected to the pole column of the battery, and the second connecting portion is electrically connected to the circuit main board.

[0030] During transportation, there may inevitably be relative movement between the battery and the circuit main board. At the same time, since the connecting tab is connected between the battery and the circuit main board, when there is relative movement between the battery and the circuit main board, the connecting tab will be affected by the pulling of the battery and the circuit main board. The connecting tab includes an elastic deformation portion. When the connecting tab is affected by the pulling of the battery and the circuit main board, it can deform adaptively, better absorb energy and impact, prevent damage to the welding position of the first connecting portion and the battery, so as to protect the welding position of the second connecting portion and the circuit main board, thereby avoiding the occurrence of an open circuit.

[0031] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, a stop projection is convexly provided on the outer peripheral surface of the intermediate housing. The stop projection is arranged to surround the intermediate housing in the circumferential direction. Wherein, one end of the intermediate housing is embedded in the bottom housing, the stop projection is located outside the bottom housing, and the stop projection has a first stop surface facing the end surface of the bottom housing, and the first stop surface abuts against the end surface of the bottom housing; a groove is provided on one of the first stop surface and the end surface of the bottom housing, and a protrusion is provided on the other of the first stop surface and the end surface of the bottom housing, and the protrusion is embedded in the groove.

[0032] When a energy storage device is usually placed on a placement plane (such as the ground, a tabletop, a countertop, etc.), the energy storage device is placed upright on the placement plane, that is, the bottom surface of the bottom shell contacts the placement plane. Therefore, the liquid on the outer shell assembly generally flows from top to bottom. For example, on a rainy day, when rain falls and drips onto the top shell, the rain on the top shell usually flows from top to bottom under the action of gravity. Even if the rain flows into the gap between the first abutting surface and the end surface of the bottom shell, when the first abutting surface is provided with a groove and the end surface of the bottom shell is provided with a convex portion embedded in the groove, since the convex portion is embedded in the groove, it forms an upward block. Under the action of gravity, the rain cannot flow upward along the convex portion, thereby preventing the rain from entering the interior of the outer shell assembly to achieve a waterproof design; and when the end surface of the bottom shell is provided with a groove and the first abutting surface is provided with a convex portion embedded in the groove, even if the rain flows into the gap between the first abutting surface and the end surface of the bottom shell, the rain will flow into the groove under the action of gravity, so that the rain is temporarily stored in the groove, thereby preventing the rain from entering the interior of the outer shell assembly to achieve a waterproof design.

[0033] As an alternative implementation manner, in the embodiment of the first aspect of the present utility model, when the first abutting surface is provided with a groove and the end surface of the bottom shell is provided with a convex portion, the convex 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 fits the inclined outer side surface. In this way, on the one hand, it can increase the climbing slope of the external liquid and increase the difficulty for the external liquid to cross the convex portion and enter the interior of the outer shell assembly, thereby further improving the waterproof performance of the outer shell assembly; on the other hand, during assembly, the cooperation between the inclined outer side surface and the inclined groove wall surface can be used to guide the convex portion to be inserted into the groove, facilitating the assembly between the middle shell and the bottom shell.

[0034] As an alternative implementation manner, in the embodiment of the first aspect of the present utility model, the other end of the middle shell is embedded in the top shell, the abutting protrusion is located between the top shell and the bottom shell, in the protruding direction of the abutting protrusion protruding from the outer peripheral surface of the middle shell, the outer peripheral surface of the abutting protrusion is lower than the outer peripheral surface of the top shell, and the outer peripheral surface of the abutting 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 surface of the bottom shell.

[0035] When the energy storage device in the present application is placed outdoors and encounters rain, the rainwater will flow along the outer peripheral surface of the top shell towards the bottom shell. When the rainwater flows to the edge of the top shell, since the outer peripheral surface of the middle shell is lower than that of the top shell, and the outer peripheral surface of the abutting protrusion is lower than that of the bottom shell, the rainwater will cross the abutting protrusion under the action of its gravity and directly drip onto the outer peripheral surface of the bottom shell and continue to flow downward along the outer peripheral surface of the bottom shell. Or even if it drips on the end face of the bottom shell, due to the existence of the protrusion and the groove, the rainwater will not seep into the interior of the outer shell assembly at the connection between the top shell and the middle shell and at the connection between the bottom shell and the middle shell. Moreover, the existence of the chamfer or fillet can guide the rainwater dripping on the end face of the bottom shell to the outer peripheral surface of the bottom shell, so that the rainwater continues to flow downward along the outer peripheral surface of the bottom shell, thus further improving the waterproof performance of the outer shell assembly.

[0036] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, the shape of the middle shell is square. One end of the middle shell is embedded in the bottom shell, and a plurality of spaced apart clamping blocks protrude from one end of the middle shell. The plurality of clamping blocks are arranged along the circumferential direction of the middle shell on the outer peripheral surface of the middle shell. A plurality of protrusions protrude from the inner side wall of the bottom shell. The plurality of protrusions are arranged along the circumferential direction of the bottom shell. Each protrusion is provided with a plug-in groove, and one clamping block is embedded in one plug-in groove to realize the connection between the middle shell and the bottom shell, so that the assembly and installation between the middle shell and the bottom shell can be facilitated.

[0037] As an alternative embodiment, in the embodiment of the first aspect of the present utility model, the energy storage device further includes a buffer member. The buffer member wraps around the outer peripheral surface and the bottom surface of the battery, so that the buffer member can play 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 directly acting on the battery by the bottom shell or the clamping assembly and protecting the battery.

[0038] In the second aspect, the present utility model discloses an energy storage system, and the energy storage system has 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 above also has all the beneficial effects of the energy storage device as described in the first aspect above. That is, the energy storage system having the energy storage device as described in the first aspect above can also achieve an efficient heat dissipation effect, keep the temperature of the battery from being too high, and further ensure the stable working state of the battery, improving the reliability and stability of its work.

[0039] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0040] The energy storage device and energy storage system provided by the embodiment of the present utility model, its housing assembly includes a top shell, an intermediate shell and a bottom shell. Among them, 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 also provided with an air supply port 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 supply port of the intermediate shell, so that the upper space of the intermediate shell (i.e., the air inlet space) can be used as the air inlet watershed of the fan assembly, and the lower space of the intermediate shell (i.e., the air outlet space) can be used as the air outlet watershed of the fan assembly. That is, when the fan assembly works, the outside air enters the air inlet space through the air inlet, and then blows towards the battery under the action of the fan assembly to take away the heat of the battery, and finally is discharged from the air outlet to the outside of the air outlet space. In this process, the path of the outside air is successively: 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 will not return to the air inlet space from the air supply port, so that the air in the air inlet space and the air outlet space can be relatively closed, that is, the inlet and outlet flow fields of the fan assembly are in a completely separated state, and the air in the air outlet space will not flow into the air inlet space, so as to ensure that the initial air temperature entering the air outlet space 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 can be close to the ambient temperature, so as to effectively dissipate the heat of the battery, keep the temperature of the battery from being too high, and then ensure the stable working state of the battery and improve its working reliability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 is the first structural schematic diagram of the energy storage device disclosed in the embodiment of the present utility model;

[0043] Figure 2 is the second structural schematic diagram of the energy storage device disclosed in the embodiment of the present utility model;

[0044] Figure 3 is Figure 2 the structural schematic diagram of the energy storage device in from another perspective;

[0045] Figure 4 is Figure 2 the sectional view of the energy storage device in along the A-A direction;

[0046] Figure 5A is Figure 2 a schematic exploded view of the energy storage device in

[0047] Figure 5B is Figure 2 a schematic exploded view of the energy storage device from another perspective in

[0048] Figure 6 is Figure 2 a side view of the energy storage device in

[0049] Figure 7 is the first schematic exploded view of the battery, the first clamping member, the second clamping member, the circuit main board, the main board mounting member and the heat insulation board disclosed in the embodiment of the present utility model;

[0050] Figure 8 is Figure 7 a schematic exploded view of another angle;

[0051] Figure 9 is the second schematic exploded view of the battery, the first clamping member, the second clamping member, the circuit main board, the main board mounting member and the heat insulation board disclosed in the embodiment of the present utility model;

[0052] Figure 10 is the schematic exploded view of the main board mounting member disclosed in the embodiment of the present utility model;

[0053] Figure 11 is the schematic exploded view of the connecting tab disclosed in the embodiment of the present utility model;

[0054] Figure 12 is the structural schematic diagram of the housing assembly disclosed in the embodiment of the present utility model;

[0055] Figure 13 is Figure 12 a partial enlarged view at M in

[0056] Figure 14 is Figure 12 a sectional view along the B-B direction of the housing assembly in

[0057] Figure 15 is Figure 14 a partial enlarged view at N in

[0058] Figure 16 is the structural schematic diagram of the intermediate housing disclosed in the embodiment of the present utility model;

[0059] Figure 17 is the structural schematic diagram of the intermediate housing from another perspective disclosed in the embodiment of the present utility model;

[0060] Figure 18It is a schematic structural diagram of a battery, a first clamping member, a second clamping member and a bottom case disclosed in an embodiment of the present utility model.

[0061] Main reference numeral description

[0062] 100 - Energy storage device; 10 - Housing assembly; 10a - Air inlet space; 10b - Air outlet space; 101 - Top case; 1011 - Air inlet; 1012 - Receiving groove; 1013 - Power plug; 102 - Intermediate housing; 102a - Wire passing hole; 1021 - Air supply port; 1022 - Stopping projection; 1022a - First stopping surface; 1022b - Groove; 1022c - Inclined groove wall surface; 1023 - Clamping block; 103 - Bottom case; 1031 - Air outlet; 1032 - Protrusion; 1032a - Inclined outer side surface; 1033 - Chamfer; 1034 - Protrusion; 1034a - Insertion groove; 1035 - Reinforcing rib; 11 - Battery; 11a - Cable bundle; 12 - Fan assembly; 13 - Holding member; 14a - First clamping member; 14a1 - Convex column; 14b - Second clamping member; 14c - Clamping space; 15 - Circuit main board; 151 - Electronic components; 1511 - Functional devices; 152 - Heat dissipation fins; 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 - Wiring groove; 164 - Sleeve structure; 1641 - Reinforcing rib strip; 17 - Heat insulation board; 171 - Avoidance notch; 17a - Thermal conductive adhesive; 18 - Connecting tab; 181 - First connecting portion; 182 - Elastic deformation portion; 183 - Second connecting portion; 19 - Buffer member; f1 - Length direction; f2 - Width direction; f3 - Height direction. Detailed implementation manners

[0063] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0065] It will be appreciated that the terms "first", "second", etc. used in the present application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of the present application, the first side heat dissipation holes may be referred to as the second side heat dissipation holes, and similarly, the second side heat dissipation holes may be referred to as the first side heat dissipation holes. Both the first side heat dissipation holes and the second side heat dissipation holes are side heat dissipation holes, but they are not the same side heat dissipation holes.

[0066] It will be appreciated that for "connection" in the following embodiments, if there is transmission of electrical signals or data between the connected circuits, modules, units, etc., it should be understood as "electrical connection", "communication connection", etc.

[0067] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising", "including" or "having", etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0068] The portable energy storage systems in the related art are generally battery systems with a low-voltage design. During the charging and discharging process, the voltage can be boosted from 3.2V on the cell side to 220V on the AC side, or reduced from 220V on the AC side to 3.2V on the cell side. During this process, a large amount of heat is generated. Most of the portable energy storage systems in the related art dissipate heat by means of air cooling. However, in actual applications, since the air inlet and outlet of the fan share the same outlet, and the air that comes into contact with the cells to take away the heat of the cells will be blown back to the battery by the fan again, the temperature of the air in contact with the cells is relatively high, making it difficult to effectively dissipate the heat of the cells. This will also cause the temperature of the cells to be relatively high, unable to meet the requirement that the temperature rise is less than 25°C, that is, the cells may still be in an environment with inappropriate temperature, which will lead to unstable battery performance and even serious consequences such as battery thermal runaway and even fire and explosion, affecting the service life and safety of the battery.

[0069] In view of this, the present application provides an energy storage device and an energy storage system that can make the temperature of the air blowing towards the battery close to the environment temperature, so as to effectively and efficiently dissipate the heat of the battery.

[0070] 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.

[0071] Please refer to Figures 1 to 4, an embodiment of the present application discloses an energy storage device. The energy storage device 100 includes a housing assembly 10 and a battery 11. The battery 11 is built into the housing assembly 10. Thus, the housing assembly 10 can be used to fix and protect the battery 11, so that under external forces, such as in the cases of dropping, knocking, and bumping, etc., it can fix and protect the battery 11 and other electronic devices or structures provided inside the housing, and can form a sealing effect on the battery 11 and other electronic devices or structures provided inside the housing, so as to prevent external impurities such as water vapor and dust from eroding the electronic devices or structures provided inside the housing assembly 10.

[0072] Please refer to Figure 4 and Figure 5A , in the present application, the housing assembly 10 includes a top shell 101, an intermediate housing 102, and a bottom shell 103. The intermediate housing 102 is located between the top shell 101 and the bottom shell 103. The intermediate housing 102 is respectively connected to the top shell 101 and the bottom shell 103. An air inlet space 10a is formed between the intermediate housing 102 and the top shell 101, and an air outlet space 10b is formed between the intermediate housing 102 and the bottom shell 103. And the top shell 101 is provided with an air inlet 1011 communicating with the air inlet space 10a. The intermediate housing 102 is provided with an air supply port 1021 communicating with the air inlet space 10a and the air outlet space 10b. The bottom shell 103 is provided with an air outlet 1031 communicating with the air outlet space 10b. The battery 11 is built into the air outlet space 10b. Among them, a fan assembly 12 is installed at the air supply port 1021 of the intermediate housing 102. The fan assembly 12 is used to suck external air through the air inlet 1011 into the air inlet space 10a, and the fan assembly 12 is also used to blow the external air in the air inlet space 10a towards the battery 11, and make the external air discharged out of the air outlet space 10b through the air outlet 1031.

[0073] By arranging the air inlet 1011 on the top shell 101 and the air outlet 1031 on the bottom shell 103, and at the same time using the intermediate shell 102 to divide the internal space of the housing assembly 10 into two relatively enclosed spaces, one of which serves as the air inlet space 10a and the other as the air outlet space 10b. Specifically, an air inlet space 10a is formed between the intermediate shell 102 and the top shell 101, and an air outlet space 10b is formed between the intermediate 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 kept relatively enclosed under the action of the fan assembly 12. Thus, when the fan assembly 12 works, the outside air enters the air inlet space 10a through the air inlet 1011, and then blows towards the battery 11 under the action of the fan assembly 12 to take away the heat of the battery 11, and finally is discharged out of the air outlet space 10b through the air outlet 1031. In this process, the path of the outside air is successively: 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 supply port, so that the air in the air inlet space 10a and the air outlet space 10b is relatively enclosed, that is, the inlet and outlet flow fields of the fan assembly 12 are in a completely separated 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 is not affected by the internal circulating air temperature, but is close to the ambient temperature, that is, to ensure that the temperature of the air in contact with the battery 11 is close to the ambient temperature, so as to effectively dissipate the heat 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, and improve its working reliability and stability.

[0074] For the convenience of description, the present application defines the air inlet area of the air inlet 1011 as S1 and the air outlet area of the air outlet 1031 as S2. It can be understood that the above definitions are only for the convenience of description and should not be used to limit the scope of the present application.

[0075] In some alternative 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, S1 / S2 = 0.8 - 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 to the air outlet area S2 of the air outlet 1031 is 0.8 - 0.9, the air inlet area S1 of the air inlet 1011 is made close to the air outlet area S2 of the air outlet 1031, that is, the area S1 of the air inlet 1011 and the air outlet area S2 of the air outlet 1031. This avoids the situation where 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. Thus, it can ensure the rate at which the air in the air outlet space 10b is discharged outside the air outlet space 10b through the air outlet 1031, so as to avoid the heated air lingering around the battery 11 while increasing the air inlet rate, which is conducive to improving the heat dissipation effect and ensuring the service life and safety of the battery 11.

[0076] Optionally, both the air inlet 1011 and the air outlet 1031 can be one or more. Moreover, the shapes of both the air inlet 1011 and the air outlet 1031 can be regular shapes or irregular shapes. For example, the shapes of both the air inlet 1011 and the air outlet 1031 can be circular, elliptical, triangular, square, rectangular, rhombic or trapezoidal, etc. The embodiments of the present application do not specifically limit the shapes of the air inlet 1011 and the air outlet 1031, as long as the shapes of the air inlet 1011 and the air outlet 1031 meet the appearance requirements and the system air resistance requirements.

[0077] Optionally, waterproof breathable membranes (not shown) can be provided at both the air inlet 1011 and the air outlet 1031. In this way, while enabling the internal and external gas of the housing assembly 10 to flow through the air inlet 1011 and the air outlet 1031 to achieve the heat dissipation effect, it can also play a waterproof role, avoiding the situation where external liquid enters the inside of the housing assembly 10 through the air inlet 1011 and the air outlet 1031 and causing the battery 11 to short-circuit, thereby ensuring the use safety of the energy storage device 100 and the performance of the battery 11.

[0078] In the present application, the shape of the energy storage device 100 can be square, then the shape of the housing assembly 10 is square, and the shape of the battery 11 is square. For example, Figure 5AAs shown, the shapes of the energy storage device 100, the housing assembly 10, and the battery 11 are all rectangular. Then, the battery 11 has a length direction f1, a width direction f2, and a height direction f3, and the height direction f3 is also the direction pointing from the bottom case 103 to the top case 101.

[0079] Please refer to Figure 5A , the energy storage device 100 in this application further includes a holding member 13. The holding member 13 is connected to the top case 101 so that when moving the energy storage device 100, the holding member 13 can be held to lift the energy storage device 100 for movement, thus making the movement of the energy storage device 100 more convenient. And a receiving groove 1012 is provided on the top surface of the top case 101 in the height direction f3. At least a part of the holding member 13 is received in the receiving groove 1012, and a holding space is formed between the holding member 13 and the receiving groove 1012 for the user's hand to extend into to hold the holding member 13. In the height direction f3, the surface of the holding member 13 facing away from the top case 101 is lower than or flush with the top surface of the top case 101. Thus, when the housing assembly 10 is placed on a placement plane such as a tabletop, a countertop, or the ground, the housing assembly 10 can be placed upside down, that is, the top surface of the top case 101 can be placed on the placement plane so that the energy storage device 100 can be placed upside down on the placement plane.

[0080] Preferably, the surface of the holding member 13 facing away from the top case 101 is lower than the top surface of the top case 101. Compared with the way that the surface of the holding member 13 facing away from the top case 101 is flush with the top surface of the top case 101, since it is difficult to maintain absolute flatness between the surface of the holding member 13 facing away from the top case 101 and the top surface of the top case 101, that is, there is likely to be a height difference between the surface of the holding member 13 facing away from the top case 101 and the top surface of the top case 101, which will affect the stability of the housing assembly 10 when placed upside down on the placement plane. Therefore, by adopting the way that the surface of the holding member 13 facing away from the top case 101 is flush with the top surface of the top case 101, the stability of the housing assembly 10 when placed upside down on the placement plane can be improved.

[0081] Considering that the holding member 13 in this application is located on the top surface of the top case 101, the air inlet 1011 is preferably provided on the side wall of the top case 101 along the width direction f2. Thus, when holding the holding member 13 to lift the energy storage device 100, on the one hand, it can avoid the situation that the user's body and hand block the air inlet 1011 and affect the air intake volume, which is beneficial to ensuring the heat dissipation effect; on the other hand, since the holding member 13 is provided on the top surface of the top case 101, occupying the space on the top surface of the top case 101, if the air inlet 1011 is also provided on the top surface of the top case 101, it is necessary to increase the area of the top surface of the top case 101, which is not conducive to the miniaturization design of the energy storage device 100 in this application. Therefore, setting the air inlet 1011 on the side wall of the top case 101 is also beneficial to the miniaturization design of the energy storage device 100.

[0082] In the present application, the air outlet 1031 and the air inlet 1011 may be located on the same side of the housing assembly 10; alternatively, the air outlet 1031 and the air inlet 1011 may be respectively located on two opposite sides of the housing assembly 10, that is, the air outlet 1031 is located on the opposite side of the air inlet 1011; or, at least one air outlet 1031 and the air inlet 1011 are located on the same side of the housing assembly 10, and at least one other air outlet 1031 and the air inlet 1011 are respectively located on two opposite sides of the housing assembly 10. For example, as Figure 2 and Figure 3 shown, the air inlet 1011 is located on the right side of the housing assembly 10, one air outlet 1031 is located on the right side of the housing assembly 10, and the other air outlet 1031 is located on the left side of the housing assembly 10.

[0083] The applicant has found through research that if the air outlet 1031 and the air inlet 1011 are arranged on the same side of the housing assembly 10, the incoming air temperature above will be affected by the outgoing air temperature below, making the temperature of the outside air passing through the air inlet 1011 slightly higher than the ambient temperature. Therefore, when conditions and space meet the requirements, it is preferably to set the air outlet 1031 on the opposite side of the air inlet 1011 to ensure that the temperature of the outside air passing through the air inlet 1011 can be close to the ambient temperature, so as to ensure that the temperature of the air in contact with the battery 11 can be close to the ambient temperature, and further to effectively dissipate the heat of the battery 11 to ensure the service life and safety of the battery 11.

[0084] As Figure 5A and Figure 6 shown, when the air inlet 1011 and the air outlet 1031 are located on the same side of the housing assembly 10, the air outlet 1031 is located at the bottom of the bottom case 103 away from the top case 101, and / or, along the height direction f3, the distance between the air outlet 1031 and the bottom surface of the bottom case 103 is d1, and the distance between the air inlet 1011 and the bottom surface of the bottom case 103 is d2, d1 / d2 = 2 / 25 - 7 / 25, such as 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 far. Through the above design, compared with setting the air outlet 1031 at a position close to the top case 101 of the bottom case 103, the distance between the air inlet 1011 and the air outlet 1031 can be farther, so as to avoid the situation that the hot air discharged through the air outlet 1031 rises to the air inlet 1011 and re-enters the air inlet 1011, thereby ensuring that the temperature of the outside air passing through the air inlet 1011 can be close to the ambient temperature, so as to ensure that the temperature of the air in contact with the battery 11 can be close to the ambient temperature, and further to effectively dissipate the heat of the battery 11 to ensure the service life and safety of the battery 11.

[0085] In some optional embodiments, combined with Figures 4 to 7 As shown, the energy storage device 100 also includes a clamping assembly disposed in the air outlet space 10b, the clamping assembly is connected to the intermediate housing 102, and the clamping assembly has a clamping space. Specifically, the clamping assembly includes a first clamping member 14a and a second clamping member 14b, the first clamping member 14a and the second clamping member 14b are respectively connected to the intermediate housing 102, and the first clamping member 14a and the second clamping member 14b are connected, a clamping space 14c is formed between the first clamping member 14a and the second clamping member 14b, and the battery 11 is built in the clamping space 14c. On the basis of designing the housing assembly 10 as a housing structure including the top housing 101, the middle housing 102 and the bottom housing 103, a first clamping member 14a and a second clamping member 14b are additionally provided for clamping the battery 11. In this way, the battery 11 can be clamped by the first clamping member 14a and the second clamping member 14b to reduce the expansion degree of the battery 11, and the battery 11 can be connected to the middle housing 102 through the first clamping member 14a and the second clamping member 14b. Compared with the mode in which the housing includes the top housing 101 and the bottom housing 103, an additional middle housing 102 connected to the top housing 101 is added, and the first clamping member 14a and the second clamping member 14b are provided. The fastener 14a, the second clamping member 14b, the bottom shell 103 and other components are respectively connected to the middle shell 102, so that the middle shell 102 can bear part of the force of the top shell 101, that is, the middle shell 102 can share part of the force from the first clamping member 14a, the second clamping member 14b, the battery 11, the bottom shell 103 and other components, to avoid all the weight being applied to the top shell 101 and causing damage to the top shell 101, increase the structural strength of the top shell 101, and then improve the bearing capacity of the top shell 101 when lifting the energy storage device 100, improve the service life of the top shell 101, and improve the service life of the outer shell assembly 10.

[0086] Optionally, the battery 11 in the present application may be one, and the energy of the energy storage device 100 in the present application may be 1KWH (1 kWh), 2KWH (2 kWh), 3KWH (3 kWh), 4KWH (4 kWh), 5KWH (5 kWh), etc., that is, the battery 11 in the present application may be a large-capacity battery 11, so that a single battery 11 can constitute an energy storage device 100, realize independent charging and discharging, and reduce the occupied space of the energy storage device 100, so that the energy storage device 100 in the present application can be adapted to more application scenarios, such as household energy storage, mobile power supply, etc. 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 energy-poor areas around the world can also obtain affordable, reliable and sustainable sources of electricity to help improve the electricity consumption of production and life in energy-poor areas. Among them, "KWH" stands for kilowatt-hours.

[0087] Exemplarily, when the energy storage device 100 in the present application is an energy storage device 100 with an energy of 1 kilowatt-hour (one degree of electricity), for energy-poor families, the energy storage device 100 with one 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 with one degree of electricity in the present application can also promote home-based small businesses, such as supporting 80 hours of irrigation or 10 hours of sewing machines, etc., enabling people in energy-poor areas to continuously increase their family income and improve their lives; or, in terms of public health, the energy storage device 100 with one degree of electricity in the present application can also support small medical devices, such as medical small refrigerators, etc., which can be used to store vaccines and medicines to improve medical conditions.

[0088] Also because the battery 11 in the present application uses a large-capacity battery, its expansion force is usually greater than that of multiple small-capacity batteries 11 in the related art. Therefore, the present application uses the first clamping member 14a and the second clamping member 14b to clamp the battery 11 to reduce the expansion degree of the battery 11, thereby facilitating ensuring the use performance of the battery 11, improving the service life of the battery 11, and reducing the potential safety hazards of the battery 11.

[0089] On this basis, in order to meet the requirement of a large expansion force, the present application also limits the materials of both the first clamping member 14a and the second clamping member 14b to metals, such as stainless steel, iron, aluminum, aluminum alloy, copper, copper alloy, etc. The materials of the first clamping member 14a and the second clamping member 14b are made of metal. Compared with the first clamping member 14a and the second clamping member 14b being plastic parts, the hardness of the first clamping member 14a and the second clamping member 14b can reach the range of 150HB - 220HB. Then, the first clamping member 14a and the second clamping member 14b have a strong ability to resist deformation, have a better pressing effect on the battery 11, so as to prevent the battery 11 from expanding, ensure that the battery 11 has excellent use performance, improve the service life of the battery 11, and reduce potential safety hazards. Among them, "HB" represents Brinell hardness.

[0090] Please refer to Figures 5A to 7 , the top shell 101 in the present application is provided with a power plug 1013, and the power plug 1013 is electrically connected to the battery 11 through a wire bundle 11a. Thus, the energy storage device 100 can be externally connected to a power source or electrically connected to a device to be charged through the power plug 1013 to achieve charging and discharging. Exemplarily, as Figure 2 and Figure 3As shown, the power plug 1013 may include three sub-power plugs 1013. One of the sub-power plugs 1013 is used to implement the function of the energy storage device 100 to charge the device to be charged; the remaining two sub-power plugs 1013 are used to implement the function of charging the energy storage device 100. Among them, one of the remaining two sub-power plugs 1013 is a mains charging plug, and the other is a photovoltaic charging plug, so that the charging and discharging of the energy storage device 100 are facilitated.

[0091] The power plug 1013 is arranged on the top shell 101 so that the power plug 1013 can be close to the holding member 13, and the distance between the holding member 13 and the power plug 1013 can be set very close. Compared with arranging the power plug 1013 on the bottom shell 103, since both the power plug 1013 and the holding member 13 are located on the top shell 101, the distance between the two is closer. When plugging and unplugging the power cord, it is easier to apply force to pull out the power plug 1013 from the power plug 1013 or insert the power cord into the power plug 1013.

[0092] Furthermore, the middle shell 102 is also provided with a wire passing hole 102a communicating with the air inlet space 10a and the air outlet space 10b. The wire bundle 11a passes through the wire passing hole 102a, and one end of the wire bundle 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 provided between the wire bundle 11a and the wire passing hole 102a. In this way, the sealing ring can seal the gap between the wire bundle 11a and the wire passing hole 102a to prevent 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 is not affected by the internal circulating air temperature, but is close to the ambient temperature, that is, to ensure that the temperature of the air in contact with the battery 11 is close to the ambient temperature, so as to effectively dissipate the heat 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, and improve its working reliability and stability.

[0093] Optionally, the sealing ring can be, but is not limited to, a silicone ring, a plastic ring, a rubber ring or a foam ring with elastic ability, etc.

[0094] Please refer to Figures 4 to 7, the energy storage device 100 further includes a circuit main board 15 disposed in the air outlet space 10b. The circuit main board 15 is located on one side of the battery 11 in its width direction f2, and the circuit main board 15 is electrically connected to the battery 11. Wherein, the other end of the wire harness is electrically connected to the circuit main board 15, that is, the electrical connection between the battery 11 and the other end of the wire harness is realized through the circuit main board 15. Thus, during discharge, the current output by the battery 11 is first transmitted to the circuit main board 15, then transmitted to the power plug 1013 through the wire harness, and finally transmitted to the device to be charged to realize the discharge of the battery 11; while during charging, the external current is transmitted to the circuit main board 15 through the power plug 1013 and the wire harness, and then transmitted to the battery 11 to realize the charging of the battery 11. Wherein, electronic components 151 are provided on the circuit main board 15, and the electronic components 151 can be but not limited to at least one of a bidirectional buck-boost converter, a bidirectional isolator, an AC-DC converter, a control chip, a control switch, and a sensor. When holding the holding member 13 to lift the energy storage device 100, since the circuit main board 15 is located on one side of the battery 11, and the weight of the battery 11 is much heavier than that of the circuit main board 15, there is a large difference in weight between the two sides. Therefore, when carrying the energy storage device 100 while walking, it will not rub against the user's leg, avoiding affecting walking.

[0095] In the present application, the circuit main board 15 can be used as a key component for monitoring, controlling, and protecting the battery 11, and a battery 11 management system (Battery Management System, BMS) can be integrated therein. On the one hand, it can monitor and manage parameters such as the voltage, temperature, charging state, and discharging state of the battery 11, thereby avoiding dangerous situations such as overcharging, over-discharging, over-current, and short circuits, ensuring the safe operation of the battery cells and extending the working life of the battery cells; on the other hand, since the energy storage device 100 of the present application is a battery 11 system composed of a single battery 11 and is a low-voltage design, the safety factor of the operator during production and maintenance can be greatly improved, and the risk factor of the product can be reduced. At the same time, based on the voltage conversion function provided by the internal voltage conversion circuit of the battery 11 management system, the low-voltage battery 11 system can output high voltages adapted to different application scenarios, that is, flexible buck-boost can be realized while reducing the operation difficulty.

[0096] Exemplarily, functional circuits with different functions are provided in the circuit main board 15. For example, a bidirectional buck-boost circuit (such as a Buck / Boost circuit), a bidirectional isolation circuit (such as an LLC circuit), and an AC-DC conversion circuit (such as CCM Totem-Pole, continuous conduction totem pole), etc. It can be understood that in actual use, the circuit main board 15 can integrate different functional circuits in the circuit main board 15 according to the application scenario of the energy storage device 100 to meet the application requirements.

[0097] Based on the energy storage device 100 in the present application, which is a battery system composed of a single battery and is a low-voltage design. Generally, the voltage value of a single battery 11 is relatively low, usually about 3.2V. When the energy storage device 100 in the present application discharges, the 3.2V DC voltage output by the battery 11 will first be boosted to 310V DC through the bidirectional buck-boost circuit on the circuit main board 15, and then inverted to 220V AC through the AC-DC conversion circuit on the circuit main board 15 to meet the charging requirements of the device to be charged, thus realizing the discharge of the energy storage device 100. When the energy storage device 100 in the present application is charged, the externally input 220V AC is first inverted to 310V DC through the AC-DC conversion circuit on the circuit main board 15, and then stepped down to 3.2V DC through the bidirectional buck-boost circuit on the circuit main board 15 to meet the charging requirements of the battery 11, thus realizing the charging of the energy storage device 100.

[0098] In some alternative embodiments, the circuit main board 15 has a heat concentration area, and the air outlet 1031 is arranged adjacent to the heat concentration area. In this way, the heat in the heat concentration area of the circuit main board 15 can quickly reach the outside of the bottom case 103 through the air outlet 1031, thereby accelerating the heat dissipation of the heat concentration area of the circuit main board 15, increasing the heat dissipation rate of the circuit main board 15, reducing the temperature of the circuit main board 15, and increasing the service life of the circuit main board 15. Among them, the heat concentration area of the circuit main board 15 is mainly the area where high-heat-generating devices such as bidirectional voltage regulators, bidirectional isolators, and AC-DC converters are concentratedly distributed.

[0099] In some alternative embodiments, in combination with Figure 5A 、 Figure 7 and Figure 8As shown, the electronic component 151 includes a functional device 1511 whose temperature is higher than or equal to 110°C in the operating state. Among them, the functional device 1511 can be, but is not limited to, at least one of a bidirectional buck-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 includes a heat dissipation fin 152, which is disposed on the side of the functional device 1511 facing away from the battery 11, and the heat dissipation fin 152 extends along the axial direction of the fan assembly 12. In this application, the heat dissipation fin 152 is disposed on the side of the functional device 1511 facing away from the battery 11, that is, for the area of the circuit board 15 with a high temperature, a heat dissipation component is locally added, which can quickly dissipate heat and cool down the functional device 1511 with a relatively high temperature in the operating state, avoid safety accidents, and improve the use safety; at the same time, the heat dissipation fin 152 is also arranged to extend along the axial direction of the fan assembly 12, so that the extending direction of the heat dissipation fin 152 can be as consistent with the wind direction as possible, so that the heat dissipation fin 152 can effectively guide the gas flowing through the functional device 1511 (that is, the gas blown out by the wind assembly), so that the gas can fully exchange heat with the functional device 1511, improve the heat dissipation effect of the functional device 1511, and have a better heat dissipation effect.

[0100] Optionally, the height of the heat dissipation fin 152 protruding relative to the circuit board 15 is as high as possible to prevent the flow field after passing through the heat dissipation fin 152 from being blocked by other devices on the circuit board 15.

[0101] In some alternative embodiments, the air outlet 1031 is disposed adjacent to the functional device 1511. In other words, at least a part of the projection of the functional device 1511 on the side wall of the bottom case 103 is located within the air outlet 1031. In this way, the gas that exchanges heat with the functional device 1511 can be quickly discharged outside the bottom case 103, avoiding staying around the functional device 1511 for a long time, which may cause the functional device 1511 to be difficult to cool down quickly 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.

[0102] In some alternative embodiments, in combination with Figure 5A 、 Figures 7 to 9As shown, the energy storage device 100 further includes a main board mounting member 16 disposed in the air outlet space 10b. The main board mounting member 16 is connected to the battery 11. Specifically, the main board mounting member 16 is connected to the first clamping member 14a, and the main board mounting member 16 is located on one side of the battery 11 along its width direction f2. The circuit main board 15 is mounted on the main board mounting member 16, and there is a spacing between the circuit main board 15 and the battery 11, so as to provide an expansion space for the battery 11 to prevent the battery 11 from squeezing the circuit main board 15 when expanding and protect the circuit main board 15.

[0103] Therefore, in the design of the present application, in order to prevent the battery 11 from squeezing the circuit main board 15 when expanding, not only the first clamping member 14a and the second clamping member 14b are provided to clamp the battery 11 to reduce the expansion degree of the battery 11 or prevent the battery 11 from expanding, so as to avoid the battery 11 squeezing the circuit main board 15 when expanding; but also the main board mounting member 16 is further added to mount the circuit main board 15 on the first clamping member 14a through the main board mounting member 16, and the circuit main board 15 is installed and supported by the main board mounting member 16, so that there can be a spacing between the circuit main board 15 and the first clamping member 14a to provide an expansion space for the battery 11, thus better avoiding the battery 11 squeezing the circuit main board 15 when expanding and providing better and more effective protection for the circuit main board 15.

[0104] In some alternative embodiments, the main board mounting member 16 can be a support column structure or a housing structure with a cavity, etc. When the main board mounting member 16 is a support column structure, the main board mounting member 16 protrudes from the surface of the first clamping member 14a facing away from the battery 11, and the circuit main board 15 is disposed on the end face of the main board mounting member 16 facing away from the first clamping member 14a, so that there is a spacing between the circuit main board 15 and the first clamping member 14a. When the main board mounting member 16 is a housing structure with a cavity, the circuit main board 15 is mounted in the cavity of the main board mounting member 16, so that there is a spacing between the circuit main board 15 and the first clamping member 14a.

[0105] Preferably, the main board mounting member 16 is a housing structure with a cavity, which can not only make there be a spacing between the circuit main board 15 and the first clamping member 14a to prevent the battery 11 from squeezing the circuit main board 15 when expanding, but also protect the circuit main board 15 from being squeezed when being externally squeezed, thus being beneficial to ensuring the service performance and service life of the circuit main board 15.

[0106] When the main board mounting member 16 is a housing structure with a cavity, it should also be noted in the present application that even if the battery 11 expands, causing the first clamping member 14a to deform, since the main board mounting member 16 is connected to the first clamping member 14a and the circuit main board 15 is mounted on the main board mounting member 16, when the battery 11 expands, the main board mounting member 16 will move outward along the expansion direction of the battery 11, and the circuit main board 15 will move outward together with the main board mounting member 16. In this way, a certain distance can be maintained between the circuit main board 15 and the main board mounting member 16 even when the battery 11 expands. Therefore, even if the battery 11 expands, the circuit main board 15 will not be squeezed. Usually, electronic components 151 are provided on the side of the circuit main board 15 facing away from the first clamping member 14a, that is, the components are located on the side of the circuit main board 15 facing the main board mounting member 16. When the battery 11 expands to a certain extent and cannot squeeze the bottom case 103, shortening the distance between the first clamping member 14a and the circuit main board 15, even if there is squeezing, it is the side of the circuit main board 15 without the electronic components 151, so as to further effectively protect the electronic components 151 on the circuit main board 15.

[0107] Please refer to Figure 7 and Figure 8 , in the present application, the main board mounting member 16 is provided with a ventilation opening 161 and a heat dissipation through hole 162 communicating with the cavity. The ventilation opening 161 is located on the top surface of the main board 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 adjacent to the ventilation opening 161, and the bottom heat dissipation hole 1622 is located at the bottom of the main board 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 both sides of the main board 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 on the same side of the housing assembly 10, and the second side heat dissipation hole 1624 is located on the opposite side of the air outlet 1031.

[0108] Specifically, when starting the fan assembly 12, under the action of the fan assembly 12, outside air enters the air inlet space 10a from the air inlet 1011, and through the action of the fan assembly 12, enters the cavity of the main board mounting member 16 through the ventilation opening 161 to blow towards the electronic components 151 and flow through the electronic components 151, taking away the heat of the electronic components 151, and then discharging to the outside of the main board mounting member 16 from the top heat dissipation holes 1621, the bottom heat dissipation holes 1622, or from the first side heat dissipation holes 1623, the second side heat dissipation holes 1624, or from the top heat dissipation holes 1621, the bottom heat dissipation holes 1622, the first side heat dissipation holes 1623 and the second side heat dissipation holes 1624, and finally discharging to the outside of the bottom case 103 from the air outlet 1031, thereby achieving the heat dissipation effect.

[0109] Through the above design, the main board mounting member 16 has a plurality of heat dissipation through holes 162, so that when starting the fan to dissipate heat from the electronic components 151, gas can flow out to the outside of the main board mounting member 16 from multiple directions, so as to improve the gas flow rate and 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, part of the local fluid flowing out from the second side heat dissipation hole 1624 flows into the bottom heat dissipation hole 1622 after heat exchange with the bottom case 103, and then flows out towards the air outlet 1031, thereby further reducing the fluid temperature of the bottom heat dissipation hole 1622, enabling the temperature of the electronic components 151 on the circuit board 15 to be further reduced, and the heat dissipation effect is better.

[0110] Optionally, for 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 operating state, at least part of the projection on the main board mounting member 16 is located in the top heat dissipation holes 1621, so as to quickly discharge the heat of the electronic components 151 with relatively large heat generation to the outside of the main board mounting member 16, thereby facilitating the improvement of the heat dissipation efficiency; and, the top heat dissipation holes 1621 are heat dissipation hole structures with completely hollow interiors, rather than heat dissipation hole structures with multiple intersecting ribs inside to divide the interior into multiple small heat dissipation holes, nor heat dissipation hole structures formed by arranging multiple spaced small heat dissipation holes, so that the top heat dissipation holes 1621 can have 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 main board mounting member 16, thereby further improving the heat dissipation efficiency.

[0111] In some alternative embodiments, a wire routing groove 163 is provided on the outer surface of the main board mount 16, and the wire harness connecting the circuit main board 15 and the power plug 1013 is clamped in the wire routing groove 163. In this way, the wire harness can be bound and guided by the wire routing groove 163, so that the circuit layout can be more concise, thereby avoiding problems such as wire harness chaos, cross distribution, and mutual entanglement, which is conducive to reducing the occupation of the internal space of the housing by the wire harness.

[0112] Furthermore, the bottom heat dissipation holes 1622 and the second side heat dissipation holes 1624 can also allow the wire harness to pass through and enter the cavity of the main board mount 16. That is, one end of a part of the wire harness can pass through the bottom heat dissipation holes 1622 and enter the cavity of the main board mount 16 to be electrically connected to the circuit main board 15 (such as the first conductive protrusion on the circuit main board 15), and one end of another part of the wire harness can pass through the second side heat dissipation holes 1624 and enter the cavity of the main board mount 16 to be electrically connected to the circuit main board 15 (such as the second conductive protrusion on the circuit main board 15).

[0113] In some embodiments, in the length direction of the energy storage device, the length of the main board mount 16 is L0, the length of the bottom heat dissipation holes 1622 is L1, and the length of the second side heat dissipation holes 1624 is L2. In the height direction of the energy storage device, the width of the main board mount 16 is D0, the width of the bottom heat dissipation holes 1622 is D1, and the width of the second side heat dissipation holes 1624 is D2. Among them, L1 / L0 = 0.85 - 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; L2 / L0 = 0.20 - 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, D1 / D0 = 0.20 - 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, D2 / D0 = 0.45 - 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 holes 1622 and the second side heat dissipation holes 1624 satisfy the above size relationship, the bottom heat dissipation holes 1622 and the second side heat dissipation holes 1624 can have a larger diameter, avoiding being blocked by the main board mount 16 when inserting the other end of the wire harness into the circuit main board 15 through the bottom heat dissipation holes 1622 and the second side heat dissipation holes 1624, which is convenient for inserting the wire harness.

[0114] In some alternative embodiments, such as Figure 8 and Figure 10 shown, a convex post 14a1 may protrude from the middle of the first clamping member 14a. The circuit main board 15 is provided with a connection hole, and the convex post 14a1 passes through the connection hole on the circuit main board 15. Since during assembly, usually the circuit main board 15 is first installed on the main board mounting member 16, and then the whole of the circuit main board 15 and the main board mounting member 16 is assembled to the first clamping member 14a. In this way, when assembling the circuit main board 15 and the main board mounting member 16 to the first clamping member 14a, the cooperation of the convex post 14a1 and the connection hole can play a role in positioning the assembly of the whole of the circuit main board 15 and the main board mounting member 16, thus facilitating the assembly between the whole of the circuit main board 15 and the main board mounting member 16 and the first clamping member 14a.

[0115] Furthermore, the convex post 14a1 can pass through the connection hole and be connected to the inner wall surface of the main board mounting member 16. In this way, the middle part of the main board mounting member 16 can be supported by the convex post 14a1, improving the load-bearing capacity of the main board mounting member 16 to avoid the situation that the circuit main board 15 and the battery 11 are squeezed when being externally squeezed, thereby protecting the circuit main board 15 and the battery 11.

[0116] In some alternative 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 convex post 14a1 on the first clamping member 14a passes through the hollow part of the sleeve structure 164 to realize the connection between the convex post 14a1 and the main board mounting member 16, thus improving the connection stability and installation convenience between the convex post 14a1 and the main board mounting member 16.

[0117] Optionally, the outer peripheral surface of the sleeve structure 164 is provided with a plurality of reinforcing ribs 1641. The plurality of reinforcing ribs 1641 are arranged at intervals along the circumferential direction of the sleeve structure 164 in the cavity of the main board mounting member 16, and the plurality of reinforcing ribs 1641 are respectively connected to the inner wall surface of the main board mounting member 16. The setting of the reinforcing ribs 1641 helps to 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 to avoid the situation that the circuit main board 15 and the battery 11 are squeezed when being externally squeezed, thereby protecting the circuit main board 15 and the battery 11.

[0118] In some alternative embodiments, in combination with Figure 5A 、 Figure 7 and Figure 8As shown in the figure, the energy storage device 100 further includes a heat insulation plate 17 disposed in the air outlet space 10b. The heat insulation plate 17 is disposed 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 during thermal runaway to the circuit main board 15, thereby preventing the fire from spreading to the circuit main board 15 when the battery 11 catches fire; or, the heat insulation plate 17 is used to weaken the heat transferred from the circuit main board 15 to the battery 11, so as to avoid the battery 11 from overheating and causing thermal runaway and even fire and explosion, etc., thereby ensuring the service life and safety of the battery 11.

[0119] 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, when the temperature of the circuit main board 15 is relatively low, if it is desired to further reduce the temperature of the battery 11, the area of the heat insulation plate 17 can be increased to block the heated air flow passing through the circuit main board 15 from bypassing the battery 11 and then flowing out of the air outlet 1031 of the bottom case 103.

[0120] Exemplarily, the heat insulation plate 17 can be a mica plate or a metal plate with a heat insulation coating on its surface. Using the above heat insulation plate 17 can better isolate the heat spread from one battery 11 to the circuit main board 15 during thermal runaway, with better heat insulation effect. At the same time, the mica plate can also prevent electric breakdown and prevent damage to the circuit main board 15. Among them, the heat insulation coating can be mainly composed of a thermal insulation material, and the thermal insulation material can be but not limited to glass fiber, asbestos, rock wool, silicate, aerogel felt, vacuum plate, etc., which has good heat insulation ability and prevents heat exchange between the battery 11 and the circuit main board 15.

[0121] In some alternative embodiments, the material of the clamping assembly is metal, that is, the materials of the first clamping member 14a and the second clamping member 14b are metal. The heat insulation plate 17 is provided with an avoidance notch 171, and a heat conductive adhesive 17a is provided in the avoidance notch 171. The heat conductive adhesive 17a is 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, not only can the first clamping member 14a and the second clamping member 14b be used to clamp the battery 11 to reduce the expansion degree of the battery 11, but also the heat of the circuit main board 15 can be conducted to the first clamping member 14a and the second clamping member 14b made of metal by using the heat conductive adhesive 17a, so as to facilitate the diffusion of heat, thereby achieving a better heat dissipation effect.

[0122] In some alternative embodiments, in combination with Figure 5A and Figure 11As shown, the circuit main board 15 is electrically connected to the battery 11 through the connecting tab 18. During discharging, the current output by the battery 11 first passes through the connecting tab 18 and is transmitted to the circuit main board 15, then is transmitted to the power plug 1013 through the cable bundle, and finally is transmitted to the device to be charged, so as to realize the discharging of the battery 11; while during charging, the external current passes through the power plug 1013 and the cable bundle and is transmitted to the circuit main board 15, and then is transmitted to the battery 11 through the connecting tab 18, so as to realize the charging of the battery 11. Wherein, the connecting tab 18 includes a first connecting portion 181, an elastic deformation portion 182 and a second connecting portion 183 which are connected in sequence. The first connecting portion 181 is electrically connected to the pole of the battery 11, and the second connecting portion 183 is electrically connected to the circuit main board 15.

[0123] During transportation, it is possible and inevitable that there is relative movement between the battery 11 and the circuit main board 15. At the same time, since the connecting tab 18 is connected between the battery 11 and the circuit main board 15, when there is relative movement between the battery 11 and the circuit main board 15, for example, when the battery 11 moves relative to the circuit main board 15, or the circuit main board 15 moves relative to the battery 11, the connecting tab 18 will be affected by the pulling of the battery 11 and the circuit main board 15. The connecting tab 18 includes an elastic deformation portion 182. When the connecting tab 18 is affected by the pulling of the battery 11 and the circuit main board 15, it can adaptively deform, better absorb energy and impact, prevent damage to the welding position of the first connecting portion 181 and the battery 11, so as to protect the welding position of the second connecting portion 183 and the circuit main board 15, thereby avoiding the occurrence of an open circuit.

[0124] In some alternative embodiments, in combination with Figures 12 to 15 As shown, a stop projection 1022 is convexly provided on the outer peripheral surface of the middle housing 102. The stop projection 1022 is arranged to surround the middle housing 102 in the circumferential direction. One end of the middle housing 102 is embedded in the bottom housing 103, the stop projection 1022 is located outside the bottom housing 103, and the stop projection 1022 has a first stop surface 1022a facing the bottom surface of the bottom housing 103. The first stop surface 1022a abuts against the end surface of the bottom housing 103, and a groove 1022b is provided on one of the first stop surface 1022a and the end surface of the bottom housing 103, and a protrusion 1032 is provided on the other of the first stop surface 1022a and the end surface of the bottom housing 103. That is, when the first stop surface 1022a is provided with the groove 1022b, the end surface of the bottom housing 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 housing 103 is provided with the groove 1022b, and the protrusion 1032 is embedded in the groove 1022b.

[0125] Generally, when the energy storage device 100 is placed on a placement plane (such as the ground, a tabletop, a countertop, etc.), the energy storage device 100 is placed upright on the placement plane, that is, the bottom surface of the bottom case 103 is in contact with the placement plane. Therefore, the liquid on the outer shell assembly 10 generally flows from top to bottom. For example, on a rainy day, when rain falls and drips onto the top case 101, the rain on the top case 101 usually flows from top to bottom under the action of gravity. Even if the rain flows into the gap between the first abutting surface 1022a and the end face of the bottom case 103, when the first abutting surface 1022a is provided with a groove 1022b and the end face of the bottom case 103 is provided with a protruding portion 1032 embedded in the groove 1022b, when the bottom case is in contact with the placement plane to place the energy storage device upright, the protruding portion 1032 can form an upward block, and the rain cannot flow upward along the protruding portion 1032 under the action of gravity, thereby preventing the rain from entering the interior of the outer shell assembly 10 to achieve 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 abutting surface 1022a and the end face of the bottom case 103, the rain will flow into the groove 1022b under the action of gravity, so that the rain is temporarily stored in the groove 1022b, thereby preventing the rain from entering the interior of the outer shell assembly 10 to achieve a waterproof design. When the end face of the bottom case 103 is provided with a groove 1022b and the first abutting surface 1022a is provided with a protruding portion 1032 embedded in the groove 1022b, when the bottom case is in contact with the placement plane to place the energy storage device upright, even if the rain flows into the gap between the first abutting surface 1022a and the end face of the bottom case 103, the rain will flow into the groove 1022b under the action of gravity, so that the rain is temporarily stored in the groove 1022b, thereby preventing the rain from entering the interior of the outer shell assembly 10 to achieve a waterproof design; when the top case is in contact with the placement plane to place the energy storage device upside down, the protruding portion 1032 can form an upward block, and the rain cannot flow upward along the protruding portion 1032 under the action of gravity, thereby preventing the rain from entering the interior of the outer shell assembly 10 to achieve a waterproof design.

[0126] Such as Figure 15As shown, when the first abutting surface 1022a is provided with a groove 1022b and the end surface of the bottom case 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 case 103 are connected at an obtuse angle. The groove 1022b has an inclined groove wall surface 1022c that fits the inclined outer side surface 1032a. In this way, on the one hand, it can increase the climbing slope of the external liquid and increase the difficulty for the external liquid to cross the protrusion 1032 and enter the interior of the housing assembly 10, thereby further improving the waterproof performance of the housing assembly 10; on the other hand, during assembly, the cooperation between the inclined outer side surface 1032a and the inclined groove wall surface 1022c can be used to guide the protrusion 1032 into the groove 1022b, facilitating the assembly between the intermediate housing 102 and the bottom case 103.

[0127] In some alternative embodiments, as Figure 14 and Figure 15 shown, the other end of the intermediate housing 102 is embedded in the top case 101, and the abutting protrusion 1022 is located between the top case 101 and the bottom case 103. In the protruding direction in which the abutting protrusion 1022 protrudes relative to the outer peripheral surface of the intermediate housing 102, the outer peripheral surface of the abutting protrusion 1022 is lower than the outer peripheral surface of the top case 101, and the outer peripheral surface of the abutting protrusion 1022 is lower than the outer peripheral surface of the bottom case 103. A chamfer 1033, such as an inclined chamfer or a rounded corner, etc., is provided at the connection between the outer peripheral surface and the end surface of the bottom case 103.

[0128] When the energy storage device 100 in the present application is placed outdoors and it rains, rainwater will flow from the outer peripheral surface of the top case 101 in the direction towards the bottom case 103. When the rainwater flows to the edge of the top case 101, since the outer peripheral surface of the intermediate housing 102 is lower than the outer peripheral surface of the top case 101 and the outer peripheral surface of the abutting protrusion 1022 is lower than the outer peripheral surface of the bottom case 103, the rainwater crosses the abutting protrusion 1022 under the action of its gravity and directly drips onto the outer peripheral surface of the bottom case 103 and continues to flow downward along the outer peripheral surface of the bottom case 103. Or even if it drips on the end surface of the bottom case 103, due to the existence of the protrusion 1032, the rainwater will not seep into the interior of the housing assembly 10 from the connection between the top case 101 and the intermediate housing 102, and the connection between the bottom case 103 and the intermediate housing 102. Moreover, the existence of the inclined chamfer or the rounded corner can guide the rainwater dripping on the end surface of the bottom case 103 to the outer peripheral surface of the bottom case 103, so that the rainwater continues to flow downward along the outer peripheral surface of the bottom case 103, thus further improving the waterproof performance of the housing assembly 10.

[0129] In some alternative embodiments, as Figure 16 、 Figure 17 and Figure 18As shown, the intermediate housing 102 is square in shape. One end of the intermediate housing 102 is convexly provided with a plurality of spaced clamping blocks 1023. The plurality of clamping blocks 1023 are arranged along the axial direction of the intermediate housing 102 on the outer peripheral surface of the intermediate housing 102. The inner side wall of the bottom housing 103 is convexly provided with a plurality of protrusions 1034. The plurality of protrusions 1034 are arranged along the circumferential direction of the bottom housing 103. Each protrusion 1034 is provided with a socket groove 1034a. One clamping block 1023 is embedded in one socket groove 1034a to realize the connection between the intermediate housing 102 and the bottom housing 103, so as to facilitate the assembly and installation between the intermediate housing 102 and the bottom housing 103.

[0130] Optionally, the bottom of each protrusion 1034 is connected with a plurality of reinforcing ribs 1035. The plurality of reinforcing ribs 1035 are convexly arranged on the inner side wall of the bottom housing 103 along the circumferential direction of the bottom housing 103, so that the structure of the protrusion 1034 can be strengthened by the plurality of reinforcing ribs 1035.

[0131] In some alternative embodiments, as Figure 18 shown, the energy storage device further includes a buffer member 19. The buffer member 19 wraps around the outer peripheral surface and the bottom surface of the battery 11, so that the buffer member 19 can play a certain buffering effect on the battery 11, and avoid the hard contact between the battery 11 and the bottom housing 103 or 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 housing 103 or the clamping assembly on the battery 11 and protecting the battery.

[0132] Specifically, when the battery 11 is directly arranged on the bottom housing 103, the buffer member 19 is located between the battery 11 and the bottom housing 103, so that the hard contact between the battery 11 and the bottom housing 103 can be avoided, and further the risk of damage to the battery 11 caused by the direct action of the bottom housing 103 on the battery 11 can be reduced, protecting the battery; when the battery 11 is arranged on the bottom housing 103 through the clamping assembly, the buffer member 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 further the risk of damage to the battery 11 caused by the direct action of the clamping assembly on the battery 11 can be reduced, protecting the battery.

[0133] Exemplarily, the buffer member 19 can be a silica gel member, a rubber member, a plastic member or a foam member, etc.

[0134] The embodiment of the present utility model also discloses an energy storage system, and the energy storage system has the energy storage device as described in any one of the foregoing embodiments. It can be understood that the energy storage system having the energy storage device described above can bring the same or similar beneficial effects as the energy storage device. For details, reference can be made to the description of the embodiments of the energy storage device, and details will not be repeated here.

[0135] In practical applications, the energy storage system can be a portable energy storage system, and can be conveniently moved to a target location according to the actual application location.

[0136] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0137] In addition, the above-described embodiments only represent several implementation manners of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the content of this specification should not be construed 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, characterized in that: The energy storage device comprises: A housing assembly, the housing assembly comprising a top housing, an intermediate housing and a bottom housing, the intermediate housing being located between the top housing and the bottom housing, the intermediate housing being connected to the top housing and the bottom housing respectively, an air inlet space being formed between the intermediate housing and the top housing, an air outlet space being formed between the intermediate housing and the bottom housing, the top housing being provided with an air inlet communicating with the air inlet space, the intermediate housing being provided with an air supply port communicating with the air inlet space and the air outlet space, and the bottom housing being provided with an air outlet communicating with the air outlet space; and A battery, wherein the battery is built into the air outlet space; Among them, the air supply outlet is installed with a fan assembly, which is used to suck the outside air into the air inlet space through the air inlet, and the fan assembly is also used to blow the outside air in the air inlet space toward the battery, and make the outside air be discharged to the outside of the air outlet space through the air outlet.

2. The energy storage device according to claim 1, characterized in that: The top shell is provided with a power plug, and the power plug is electrically connected to the battery through a harness; wherein, The intermediate shell is further provided with a wire passing hole communicating with the air inlet space and the air outlet space, the wire harness is passed through the wire passing hole, and a sealing ring is provided between the wire harness and the wire passing hole.

3. The energy storage device according to claim 1, characterized in that: The air inlet area of ​​the air inlet is S1, the air outlet area of ​​the air outlet is S2, S1<S2, and / or, S1 / S2=0.8-0.

9.

4. The energy storage device according to claim 1, characterized in that: The air inlet and the air outlet are located on the same side of the shell component, or the air inlet and the air outlet are located on two opposite sides of the shell component respectively, 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 shell component, 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, characterized in that: When the air inlet and the air outlet are located on the same side of the housing assembly; The air outlet is located at the bottom of the bottom shell away from the top shell, and / 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, d1 / d2=2 / 25-7 / 25.

6. The energy storage device according to claim 1, characterized in that: The energy storage device also includes a circuit mainboard arranged in the air outlet space, the circuit mainboard is located on one side of the battery in its width direction, and the circuit mainboard is electrically connected to the battery. The circuit mainboard has a heat concentration area, and the air outlet is arranged adjacent to the heat concentration area.

7. The energy storage device according to claim 1, characterized in that: The energy storage device further includes a circuit mainboard arranged in the air outlet space, the circuit mainboard is located on one side of the battery in the width direction thereof, and the circuit mainboard is electrically connected to the battery, the circuit mainboard is provided with electronic components, and the electronic components include functional components whose temperature is higher than or equal to 110° C. in the operating state; The energy storage device further comprises a heat dissipation fin, which is arranged on a side of the functional device facing away from the battery, and the heat dissipation fin is extended along the axial direction of the fan assembly.

8. The energy storage device according to claim 7, characterized in that: The air outlet is arranged adjacent to the functional device.

9. The energy storage device according to claim 1, characterized in that: The energy storage device further includes a mainboard mounting member and a circuit mainboard disposed in the air outlet space, the mainboard mounting member is connected to the battery, and the mainboard mounting member is located on one side of the battery along its width direction, the mainboard mounting member is a shell structure having a cavity, the circuit mainboard is mounted in the cavity of the mainboard mounting member, and there is a spacing between the circuit mainboard and the battery, and the circuit mainboard is electrically connected to the battery, wherein, The mainboard mounting component is provided with a ventilation hole and a heat dissipation through-hole connected to the cavity, the ventilation hole is located on the top surface of the mainboard mounting component 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 hole, the bottom heat dissipation hole is located at the bottom of the mainboard mounting component 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 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, characterized in that: The top shell is provided with a power plug, the intermediate shell is also 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 passed through the wire hole, one end of the wire harness is electrically connected to 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 member to be electrically connected to the battery; In the length direction of the energy storage device, the length of the mainboard 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 mainboard 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 L1 / L0=0.85-0.95, L2 / L0=0.20-0.30, D1 / D0=0.20-0.30, and D2 / D0=0.45-0.

60.

11. The energy storage device according to claim 1, characterized in that: The energy storage device also includes a circuit main board and a heat insulation board arranged in the air outlet space, the circuit main board is located on one side of the battery in its width direction, and the circuit main board is electrically connected to the battery, and the heat insulation board is arranged between the circuit main board and the battery.

12. The energy storage device according to claim 11, characterized in that: The energy storage device further comprises a clamping assembly disposed in the air outlet space, the clamping assembly is connected to the intermediate housing, and the clamping assembly forms a clamping space, the battery is built in the clamping space, and the heat insulation board is located between the circuit main board and the clamping assembly; The material of the clamping assembly is metal, the heat insulation plate is provided with an avoidance gap, the avoidance gap is provided with a thermal conductive adhesive, and the thermal conductive adhesive is bonded between the circuit main board and the clamping assembly.

13. The energy storage device according to claim 1, characterized in that: The energy storage device also includes a first clamping member and a second clamping member arranged 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, 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 claim 1, characterized in that: The energy storage device further includes a circuit mainboard disposed in the air outlet space, the circuit mainboard is located on one side of the battery in its width direction, and the circuit mainboard is electrically connected to the battery via a connecting bar; wherein, The connecting bar includes a first connecting portion, an elastic deformation portion, and a second connecting portion which are connected in sequence. The first connecting portion is electrically connected to the pole of the battery, and the second connecting portion is electrically connected to the circuit board.

15. The energy storage device according to any one of claims 1 to 14, characterized in that: The outer circumferential surface of the intermediate shell is convexly provided with a stop protrusion, and the stop protrusion is arranged around the circumference of 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 toward 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 protrusion, and the protrusion is embedded in the groove.

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

17. The energy storage device according to claim 15, characterized in that: The other end of the intermediate shell is embedded in the top shell, and 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 a chamfer is provided at the connection between the outer circumferential surface of the bottom shell and the end surface of the bottom shell.

18. The energy storage device according to any one of claims 1 to 14, characterized in that: 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 is protruding with a plurality of spaced-apart blocks, and the plurality of blocks are arranged along the circumference of the intermediate shell on the outer circumferential surface of the intermediate shell, and the inner side wall of the bottom shell is protruding with a plurality of protrusions, and the plurality of protrusions are arranged along the circumference of the bottom shell, each of the protrusions is provided with an insertion groove, and one of the blocks is embedded in one of the insertion grooves.

19. The energy storage device according to any one of claims 1 to 14, characterized in that: The energy storage device further includes a buffer member, which is wrapped around the outer peripheral surface and the bottom surface of the battery.

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

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