Energy storage device and energy storage system

Abstract

The utility model provides an energy storage device and an energy storage system, and relates to the technical field of energy storage. The energy storage device comprises a shell, a roll core, a cover plate and a flow collecting disc, the shell comprises a main body part, a guide part and a mounting part, in the axial direction of the main body part, one end of the guide part is connected to the main body part, the other end of the guide part is connected to the mounting part, the guide part is of a conical structure, and the small opening end of the guide part faces the mounting part; the roll core is arranged in the shell, and the guide part is used for guiding the roll core; the cover plate covers the mounting part, and a center hole is formed in the cover plate; the flow collecting disc is arranged in the shell and between the roll core and the cover plate, and a protruding structure is arranged on the side, facing the cover plate, of the flow collecting disc and penetrates through the center hole.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage technology field in general, specifically, relate to a kind of energy storage device and energy storage system. BACKGROUND

[0002] The existing cylindrical battery includes a top cover, a current collector, an aluminum shell and a winding core. During assembly, the top cover is first welded with the aluminum shell to form a single-side opening structure. After the current collector is welded with the winding core, the current collector and the winding core are placed as a whole from the opening into the aluminum shell, and the protrusion in the middle of the current collector is inserted through the center hole of the top cover. Finally, the top cover and the current collector are welded and fixed at the matching position.

[0003] Since the diameter of the winding core is smaller than the inner diameter of the aluminum shell, there is a gap between the winding core and the inner wall of the aluminum shell. Under the action of the gap, the winding core is prone to deviate to one side during assembly, which may cause difficulty in entering the shell. Moreover, the protrusion of the current collector cannot be inserted into the center hole of the top cover, which affects the assembly precision and assembly production efficiency. SUMMARY

[0004] The energy storage device and the energy storage system provided by the utility model improve the accuracy of entering the shell and the assembly efficiency.

[0005] According to a first aspect of the utility model, an energy storage device is provided, which includes:

[0006] A shell includes a main body portion, a guide portion and a mounting portion. Along the axial direction of the main body portion, one end of the guide portion is connected to the main body portion, and the other end is connected to the mounting portion. The guide portion is a tapered structure, and the small end of the guide portion is arranged towards the mounting portion.

[0007] A winding core is arranged in the shell, and the guide portion is used for guiding the winding core.

[0008] A cover plate is arranged on the mounting portion, and the cover plate is provided with a center hole.

[0009] A current collector is arranged in the shell and between the winding core and the cover plate. The side of the current collector facing the cover plate is provided with a protruding structure, and the protruding structure is arranged in the center hole.

[0010] In some embodiments, along the axial direction of the main body portion, the wall thickness of the main body portion is uniform.

[0011] And / or, along the axial direction of the main body portion and from the main body portion to the mounting portion, the wall thickness of the guide portion gradually increases. The minimum wall thickness of the guide portion is equal to the wall thickness of the main body portion, and the maximum wall thickness of the guide portion is equal to the wall thickness of the mounting portion.

[0012] In some embodiments, the sum of the heights of the guide portion and the mounting portion is less than the height of the main body portion along the axial direction of the main body portion.

[0013] In some embodiments, the inner wall of the guide portion is curved.

[0014] In some embodiments, the energy storage device further comprises:

[0015] A buffer is arranged in the housing and at the end of the winding core facing the cover plate, the buffer is sleeved on the outside of the winding core and arranged between the winding core and the housing.

[0016] In some embodiments, the outer wall of the buffer is provided with a guide portion for guiding between the buffer and the guide portion.

[0017] In some embodiments, a gap is arranged between the outer wall of the buffer and the inner wall of the guide portion.

[0018] In some embodiments, the inner wall of the guide portion is provided with an exhaust groove for discharging heat generated by the winding core.

[0019] In some embodiments, along the axial direction of the main body portion, the end surface of the winding core facing the cover plate and the buffer divide the cavity of the housing into a first space and a second space, and the second space communicates with the first space through the exhaust groove.

[0020] In some embodiments, the exhaust groove is arranged extending along the axial direction of the main body portion.

[0021] In some embodiments, the exhaust groove is arranged in the mounting portion and / or the guide portion.

[0022] In some embodiments, along the axial direction of the main body portion, the length of the exhaust groove is greater than or equal to the height of the mounting portion.

[0023] In some embodiments, the number of exhaust grooves is multiple, and the multiple exhaust grooves are arranged along the circumferential direction of the main body portion.

[0024] According to a second aspect of the present application, an energy storage system is provided, comprising the energy storage device.

[0025] An embodiment of the present application has the following advantages or beneficial effects:

[0026] The energy storage device and the energy storage system provided by the embodiment of the utility model, the main part is connected to the mounting part through the guide part, the guide part is tapered structure, because the inner diameter of the shell is gradually reduced, the guide part plays a role of guiding the winding core, the central effect of the winding core with the current collecting disc when assembling into the shell is realized, the condition that the winding core is relatively displaced from the shell due to the existence of large gap between the shell and the winding core is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0027] For better understanding of the utility model, the embodiments shown in the following drawings can be referred to. The components in the drawings are not necessarily in proportion, and the related elements can be omitted in order to emphasize and clearly illustrate the technical features of the utility model. In addition, the related elements or components can have different settings as known in the art. Furthermore, in the drawings, the same reference signs represent the same or similar components in each drawing. The above and other features and advantages of the utility model will become more apparent by describing example embodiments thereof with reference to the accompanying drawings.

[0028] Wherein:

[0029] Figure 1 The structure schematic diagram of the energy storage device of an embodiment of the utility model is shown;

[0030] Figure 2 The explosion schematic diagram of the energy storage device of an embodiment of the utility model is shown;

[0031] Figure 3 The sectional view of the energy storage device of an embodiment of the utility model is shown;

[0032] Figure 4 The cooperation schematic diagram of the winding core, the buffer and the shell in the energy storage device of an embodiment of the utility model is shown;

[0033] Figure 5 The structure schematic diagram of the buffer of the energy storage device of an embodiment of the utility model is shown;

[0034] Figure 6 The structure schematic diagram of the shell in the energy storage device of an embodiment of the utility model is shown;

[0035] Figure 7 The structure schematic diagram of the energy storage device of an embodiment of the utility model is shown;

[0036] Figure 8 The structure schematic diagram of the energy storage system of an embodiment of the utility model is shown.

[0037] Wherein, the reference signs are explained as follows:

[0038] 100, energy storage device; 200, electric energy conversion device; 300, user load;

[0039] 1, housing; 2, winding core; 3, cover plate; 4, current collector plate; 5, buffer;

[0040] 10, exhaust groove; 11, main body part; 12, guide part; 13, mounting part;

[0041] 101, first space; 102, second space;

[0042] 31, center hole; 32, second exhaust hole;

[0043] 41, protruding structure; 42, first exhaust hole;

[0044] 51, guide part; 52, mounting groove. DETAILED DESCRIPTION

[0045] The technical solutions in the example embodiments of the present application will be described clearly and completely in combination with the drawings in the example embodiments of the present application. The example embodiments described in the text are only for the purpose of illustration, and are not intended to limit the protection scope of the present application, so it should be understood that various modifications and changes can be made to the example embodiments without departing from the protection scope of the present application.

[0046] In the description of the present application, unless otherwise explicitly specified and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" means two or more than two; the term "and / or" includes any combination and all combinations of one or more associated listed items. In particular, referring to "the" object or "one" object is also intended to represent one of the possible multiple such objects.

[0047] Unless otherwise specified or described, the terms "connection", "fixing" and the like should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integrally connected, or electrically connected, or signal connected; "connection" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Further, in the description of the utility model, it needs to be understood that the orientation words such as '' upper '', '' lower '', '' inner '' and '' outer '' described in the example embodiment of the utility model are described with the angle shown in the drawing, and should not be understood as the limitation of the example embodiment of the utility model. It also needs to be understood that in the context, when referring to one element or feature being connected on, under, or in, or out of another element, it can not only be directly connected on, under, or in, or out of another element, but also indirectly connected on, under, or in, or out of another element through an intermediate element.

[0049] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and description of these elements will not be repeated with each figure.

[0050] The embodiment provides a kind of energy storage device, such as Figures 1-2 As shown, the energy storage device includes shell 1, winding core 2, cover plate 3 and current collector plate 4, wherein shell 1 is aluminum shell or aluminum alloy shell, that is, shell 1 can be made of aluminum material or aluminum alloy material, with the advantage of light weight.Shell 1 is hollow structure, the inside of shell 1 has cavity, winding core 2 is arranged in the cavity of shell 1, shell 1 provides accommodation space for winding core 2, and plays the role of protecting winding core 2.As shown, Figure 3 As shown, current collector plate 4 is arranged in shell 1 and between winding core 2 and cover plate 3, and the side of current collector plate 4 towards cover plate 3 is provided with protruding structure 41, and cover plate 3 is provided with center hole 31, and protruding structure 41 is arranged in center hole 31.

[0051] Among them, shell 1 is two-end opening structure, when assembling, cover plate 3 is first covered on one end opening of shell 1, so that cover plate 3 blocks one end opening of shell 1.After welding current collector plate 4 on the end of winding core 2, winding core 2 with current collector plate 4 is put into shell 1 from the other end opening of shell 1, then protruding structure 41 of current collector plate 4 is arranged in center hole 31 of cover plate 3, to realize the positioning between current collector plate 4 and cover plate 3, and finally welding and fixing are carried out at the position matched with each other of protruding structure 41 and the inner wall of center hole 31.

[0052] Since the inner diameter of shell 1 is greater than the outer diameter of winding core 2, during the process of winding core 2 being put into shell 1, winding core 2 is prone to positional deviation relative to shell 1, which makes it difficult to accurately align between protruding structure 41 of current collector plate 4 and center hole 31 of cover plate 3, and affects the assembly precision and assembly production efficiency.

[0053] To solve this problem, as shown in Figure 3 The shell 1 provided by the embodiment includes a main body part 11, a guide part 12, and a mounting part 13. Along the axial direction of the main body part 11, one end of the guide part 12 is connected to the main body part 11, and the other end is connected to the mounting part 13. The guide part 12 is a tapered structure, and the small end of the guide part 12 is arranged towards the mounting part 13. The guide part 12 is used for guiding the winding core 2, and the mounting part 13 is used for mounting the cover plate 3.

[0054] The energy storage device provided by the embodiment has the main body part 11 connected to the mounting part 13 through the guide part 12. The guide part 12 is a tapered structure. Since the inner diameter of the shell 1 gradually decreases, the guide part 12 plays a role in guiding the winding core 2, achieving the centering effect of the winding core 2 with the current collector plate 4 when assembled into the shell, and avoiding the situation that the winding core 2 is greatly deviated relative to the shell 1 due to the existence of a large gap between the shell 1 and the winding core 2. Through the variable inner diameter design of the shell 1, the current collector plate 4 can be effectively assembled into the shell, improving the assembly precision and assembly efficiency.

[0055] In one embodiment, the outer diameters of the main body part 11, the guide part 12, and the mounting part 13 are the same, so that the overall outer diameter of the shell 1 is the same. The shell 1 has a cylindrical structure, and the shell 1 has good appearance and consistency. In addition, when assembled into a module, the positive side of the energy storage device is placed at the bottom. The overall outer diameter of the shell 1 is the same, which makes the module assembly more stable and reduces the risk of tilting, reduces the assembly difficulty, and improves the assembly production efficiency.

[0056] In one embodiment, the main body part 11, the guide part 12, and the mounting part 13 are integrally formed. The adoption of the integral structure can reduce the support and connection structure between the parts, facilitate processing, and be conducive to weight reduction and reduction of processing and maintenance costs.

[0057] Specifically, as shown in Figure 3 Along the axial direction of the main body part 11, the wall thicknesses of the main body part 11 are the same, which can make the forces at all parts of the main body part 11 uniform and increase the stability. The main body part 11 has a cylindrical shell structure, the inner diameter of the main body part 11 is slightly larger than the outer diameter of the winding core 2, the inner diameter of the main body part 11 and the outer diameter of the winding core 2 are matched, and the winding core 2 can be easily assembled into the shell.

[0058] In one embodiment, as shown in Figure 3 Along the axial direction of the main body part 11 and from the main body part 11 to the mounting part 13, the wall thickness of the guide part 12 gradually increases. The minimum wall thickness of the guide part 12 is equal to the wall thickness of the main body part 11, and the maximum wall thickness of the guide part 12 is equal to the wall thickness of the mounting part 13.

[0059] Compared with the guide portion 12 and the mounting portion 13, the main body portion 11 has a thinner wall thickness, which can effectively reduce the weight of the entire shell 1, save costs, and maximize the internal space of the shell 1, thereby effectively improving the capacity of the winding core 2 and improving the specific capacity. At the same time, the wall thickness of the mounting portion 13 is relatively thick, which ensures the fitting strength between the mounting portion 13 and the cover plate 3 and improves the welding reliability between the cover plate 3 and the mounting portion 13. For example, the inner diameter of the main body portion 11 can be 63 mm, the inner diameter of the mounting portion 13 can be 62.5 mm, the wall thickness of the guide portion 12 gradually increases, the guide portion 12 serves as an intermediate transition between the main body portion 11 and the mounting portion 13, and the inner wall surface of the guide portion 12 has a certain inclination angle, which plays a certain guiding role for the winding core 2 entering the shell.

[0060] In one embodiment, along the axial direction of the main body portion 11, the sum of the heights of the guide portion 12 and the mounting portion 13 is less than the height of the main body portion 11, which helps to reduce the overall weight of the shell 1 and maximize the internal space of the main body portion 11, thereby effectively improving the battery capacity and improving the specific capacity.

[0061] In one embodiment, the inner wall of the guide portion 12 is a curved surface structure, which can reduce sharp edges and burrs and play a protective role for the winding core 2.

[0062] When the winding core 2 passes through the guide portion 12, if the winding core 2 and the inner wall of the guide portion 12 are in contact, the guide portion 12 may squeeze the winding core 2, which causes abnormal reaction in the winding core 2.

[0063] To solve this problem, as shown in Figure 4 The energy storage device provided by the embodiment further includes a buffer member 5, wherein the buffer member 5 can be a gasket, and the buffer member 5 can be made of a high-temperature-resistant rubber material. The buffer member 5 is arranged in the shell 1 and at one end of the winding core 2 facing the cover plate 3, and the buffer member 5 is sleeved on the outside of the winding core 2 and arranged between the winding core 2 and the shell 1.

[0064] During the process of the winding core 2 entering the shell, the buffer member 5 plays a buffering role between the winding core 2 and the guide portion 12, avoids excessive extrusion of the positive and negative separators of the winding core 2, and prevents abnormal reaction in the winding core 2, thereby improving the use reliability of the energy storage device.

[0065] In one embodiment, a gap is provided between the outer wall of the buffer member 5 and the inner wall of the guide portion 12, so that the outer part of the buffer member 5 and the inner wall of the guide portion 12 are not in direct contact, avoiding the situation that the guide portion 12 extrudes the winding core 2 through the buffer member 5. At the same time, when the winding core 2 is in thermal runaway, the gap can also serve as an exhaust passage for discharging the heat generated by the winding core 2, thereby avoiding the situation that the winding core 2 abnormally functions due to excessive temperature.

[0066] In one embodiment, as shown in Figure 5 The outer wall of the buffer 5 is provided with a guide portion 51 for guiding between the buffer 5 and the guide portion 12. The guide portion 51 of the buffer 5 and the inner wall of the guide portion 12 cooperate to better guide.

[0067] Illustratively, the guide portion 51 is specifically a round corner or a chamfer provided on the outer wall of the buffer 5, and the round corner or chamfer is specifically provided at the connecting corner between the top end face and the side face of the buffer 5. The inner wall surface of the guide portion 12 is a curved surface structure, and the round corner or chamfer is tangent to the curved surface structure, further improving the guiding effect.

[0068] Illustratively, the guide portion 51 can also be a guide slope provided on the outer wall of the buffer 5, which provides guidance for the inner wall surface of the guide portion 12, improving the guiding effect.

[0069] In one embodiment, as shown in Figure 5 Along the axial direction of the main body portion 11, the side of the buffer 5 towards the winding core 2 is provided with a mounting groove 52, and at least a part of the end of the winding core 2 towards the cover plate 3 is arranged in the mounting groove 52, so that the buffer 5 can be fixed to the winding core 2.

[0070] In one embodiment, as shown in Figures 4-5 Along the axial direction of the main body portion 11, the end face of the side of the winding core 2 towards the cover plate 3 and the buffer 5 divide the cavity of the shell 1 into a first space 101 and a second space 102. The first space 101 is located above the second space 102 along the axial direction of the main body portion 11. Illustratively, the space enclosed between the winding core 2, the buffer 5, the shell 1 and the cover plate 3 is the first space 101. Since the guide portion 12 is a tapered structure with variable diameter, during the process of pushing the winding core 2 into the shell 1, the air inside the first space 101 will be compressed. If the inner wall of the buffer 5 and the guide portion 12 are in contact, the first space 101 is approximately in a vacuum environment, resulting in that the air inside the first space 101 will generate a reaction force on the winding core 2. The reaction force is opposite to the direction of the pushing force of the winding core 2 into the shell, which will hinder the winding core 2 from entering the shell, causing difficulty in entering the shell.

[0071] To solve this problem, as shown in Figure 6 The inner wall of the guide portion 12 is provided with an exhaust groove 10, and the second space 102 is communicated with the first space 101 through the exhaust groove 10. The exhaust groove 10 plays a role of pressure relief, so that the internal air pressure of the first space 101 and the second space 102 is balanced, avoiding the situation that the air in the first space 101 cannot be discharged and is compressed during the process of entering the shell, resulting in unsmooth entering of the shell. The air in the first space 101 will not generate a reaction force on the winding core 2, improving the smoothness of the winding core 2 entering the shell.

[0072] In addition, when the winding core 2 is in thermal runaway, the heat generated by the winding core 2 is discharged from the second space 102 to the first space 101 through the exhaust groove 10, the exhaust groove 10 is used for discharging the heat generated by the winding core 2, which is beneficial to rapid heat dissipation and avoids the failure of the winding core 2 due to high temperature.

[0073] Since the main body part 11, the guide part 12 and the mounting part 13 are arranged along the axial direction of the main body part 11, the exhaust groove 10 is arranged along the axial direction of the main body part 11, that is, the extension direction of the exhaust groove 10 is the same as the arrangement direction of the second space 102 and the first space 101, so that the exhaust groove 10 can timely transport the heat to the first space 101 after receiving the heat in the second space 102, the heat transport path is shortened, and the heat dissipation effect is improved.

[0074] Specifically, as shown in Figures 6-7 , the exhaust groove 10 is arranged on the mounting part 13 and / or the guide part 12. For example, the exhaust groove 10 can be arranged only on the inner wall of the mounting part 13, or the exhaust groove 10 can be arranged only on the inner wall of the guide part 12, or the exhaust groove 10 can be arranged on the inner wall of the mounting part 13 and the inner wall of the guide part 12.

[0075] Specifically, along the axial direction of the main body part 11, the length of the exhaust groove 10 is greater than or equal to the height of the mounting part 13. With this arrangement, the exhaust groove 10 can extend from the mounting part 13 to the guide part 12, so that even if the buffer 5 and the inner wall of the guide part 12 are in contact, the buffer 5 will not completely isolate the first space 101 and the second space 102, the communication between the second space 102 and the first space 101 is realized by the exhaust groove 10, so that the heat generated by the winding core 2 can still be discharged from the second space 102 to the first space 101, and the air pressure balance between the first space 101 and the second space 102 can be ensured, the smoothness of the winding core 2 during the process of entering the shell is improved, and the effective entry of the heat sink 4 and the buffer 5 into the shell during assembly is ensured.

[0076] Specifically, the number of exhaust grooves 10 is multiple, and the multiple exhaust grooves 10 are arranged along the circumferential direction of the main body part 11, and the multiple exhaust grooves 10 are arranged around the whole circumference of the mounting part 13, which improves the uniformity and timeliness of heat dissipation.

[0077] In one embodiment, as shown in Figures 3-4 , the heat sink 4 is provided with a first exhaust hole 42, and the cover plate 3 is provided with a second exhaust hole 32 corresponding to the first exhaust hole 42, the first exhaust hole 42 and the second exhaust hole 32 are communicated, and are used for discharging the heat generated by the winding core 2.

[0078] When the winding core 2 is in thermal runaway, the heat generated by the winding core 2 enters the first space 101 through the first exhaust hole 42, and then is discharged to the external atmosphere through the second exhaust hole 32, so as to avoid the influence of the high temperature of the winding core 2 on the use performance.

[0079] The number of the first exhaust holes 42 and the second exhaust holes 32 is multiple, and the number of the first exhaust holes 42 and the number of the second exhaust holes 32 can be the same, or the number of the first exhaust holes 42 is greater than the number of the second exhaust holes 32. The number of the first exhaust holes 42 and the number of the second exhaust holes 32 are not limited in the embodiment, and can be adjusted according to actual production needs.

[0080] It can be understood that most of the heat generated by the thermal runaway of the winding core 2 can be discharged to the first space 101 through the first exhaust hole 42, and a small part of the heat can be discharged to the first space 101 through the exhaust groove 10. The first space 101 plays a role in collecting heat, and finally, the heat collected in the first space 101 is discharged to the external atmosphere through the second exhaust hole 32.

[0081] Since the energy required by people has strong time and space characteristics, in order to reasonably use energy and improve the utilization rate, it is necessary to store one form of energy in the same form of energy or convert it into another form of energy through a medium or device, and then release it in a specific energy form based on future applications.

[0082] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage of the green power grid to be unstable, and the unstable voltage will cause damage to the power. Therefore, due to insufficient electricity demand or insufficient grid accommodation capacity, the problem of "abandoning wind and light" may be caused.

[0083] In order to solve the problem of insufficient electricity demand or insufficient grid accommodation capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electrical energy is stored in other forms of energy through physical or chemical means, and when needed, the energy stored in the energy storage device is converted into electrical energy and released. In simple terms, the energy storage device is similar to a large "power bank". When light energy and wind energy are sufficient, electrical energy is stored, and when needed, the stored electrical energy is released.

[0084] The current energy storage application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0085] Large energy storage containers applied in power grid side energy storage scenarios can be used as high-quality active and reactive power regulation power sources in the power grid, realize load matching of electrical energy in time and space, enhance renewable energy consumption capacity, and have great significance in power grid system backup, relieving peak load power supply pressure and peak regulation.

[0086] The small-sized energy storage cabinet applied to the commercial and industrial energy storage scene at the user side and the small-sized energy storage box applied to the household energy storage scene at the user side mainly run in the mode of "peak load shifting". Since there is a large price difference between the electricity charges at the peak and valley positions according to the electricity demand, after the user has the energy storage device, in order to reduce the cost, the energy storage device is usually charged at the low electricity price valley period, and the electricity in the energy storage device is discharged for use at the high electricity price peak period, so as to save the electricity charges. In addition, in remote areas and areas where natural disasters such as earthquakes and hurricanes frequently occur, the existence of the household energy storage device is equivalent to that the user provides a standby power source for himself and the power grid, and avoids the inconvenience caused by frequent power outages due to disasters or other reasons.

[0087] The energy storage system provided by the embodiments of the present application comprises an energy storage device, so as to realize the storage or supply of electric energy by the energy storage device.

[0088] Taking the household energy storage scene in the user-side energy storage as an example, Figure 8 A schematic diagram of an energy storage system provided by the embodiments of the present application is shown, which comprises an energy storage device 100 and an electric energy conversion device 200, and a user load 300. The electric energy conversion device 200 is electrically connected with the energy storage device 100, and the energy storage device 100 is electrically connected with the user load 300. The energy storage device 100 is a small-sized energy storage box, which can be installed on an outdoor wall in a wall-mounted manner. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy, and store the electric energy by the energy storage device 100, and then supply the electric energy to the user load 300 for use at the electricity price peak, or supply the electric energy to the user load 300 for use when the power grid is powered off.

[0089] The energy storage device 100 can be a battery pack, a battery box, a battery system or the like composed of battery monomers. The battery monomers can be secondary batteries such as lithium ion batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, magnesium ion batteries, and can be in the form of a cylinder, a flat body, a cuboid or the like, which is not limited in the embodiments of the present application. In addition, the battery monomers can realize the charging and discharging process by the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in the battery monomers through the chemical reaction or change of the energy storage medium, and the electric energy stored in the battery monomers is released for use or transferred for use when the use of external electric energy reaches the peak.

[0090] It should be noted that the embodiments of the present application can be in the drawings and described in the present application, and only one example of the principle of the present application is adopted. It should be clearly understood by those skilled in the art that the principle of the present application is not limited to any detail or any component of the device shown in the drawings or described in the specification.

[0091] It should be understood that the present application is not limited to the precise construction and arrangement of parts as set forth above and in the attached drawings. The present application can have other embodiments and be practiced in a variety of ways. The foregoing described embodiments and modifications of the present application are further intended to be included within the scope of the present application, as described in the following claims. It is also to be understood that the present application is not limited to the particular embodiments described herein, but the scope of the present application extends to any variations that would be apparent to persons skilled in the art upon use of the present application.

[0092] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that fall within the scope of the present application, including what can be perceived as modifications or additions. The specification and examples given are intended as illustrative only and not in a limiting sense. The true scope of the present application is set forth in the following claims.

[0093] It is to be understood that the application is not limited to the specific details and arrangements of parts described above and illustrated in the drawings. The scope of the application is limited only by the claims appended hereto.

Claims

1. An energy storage device, characterized by, The energy storage device comprises: a housing, the housing comprising a main body portion, a guide portion and a mounting portion, one end of the guide portion being connected to the main body portion and the other end being connected to the mounting portion along the axial direction of the main body portion, the guide portion being a tapered structure, the small end of the guide portion being arranged towards the mounting portion; a winding core arranged in the housing, the guide portion being used for guiding the winding core; a cover plate arranged on the mounting portion, the cover plate being provided with a central hole; a current collecting plate arranged in the housing and between the winding core and the cover plate, the side of the current collecting plate facing the cover plate being provided with a protruding structure, the protruding structure being arranged through the central hole.

2. The energy storage device of claim 1, wherein, The wall thickness of the main body portion is uniform along the axial direction of the main body portion. And / or, the wall thickness of the guide portion gradually increases along the axial direction of the main body portion and from the main body portion to the mounting portion, the minimum wall thickness of the guide portion being equal to the wall thickness of the main body portion, and the maximum wall thickness of the guide portion being equal to the wall thickness of the mounting portion.

3. The energy storage device of claim 1, wherein, The sum of the heights of the guide portion and the mounting portion is less than the height of the main body portion along the axial direction of the main body portion. And / or, the inner wall of the guide portion is a curved surface structure.

4. The energy storage device of any one of claims 1-3, wherein, Further comprising: a buffer member arranged in the housing and at the end of the winding core facing the cover plate, the buffer member being arranged outside the winding core and between the winding core and the housing.

5. The energy storage device of claim 4, wherein, The outer wall of the buffer member is provided with a guide portion, the guide portion being used for guiding between the buffer member and the guide portion.

6. The energy storage device of claim 4, wherein, A gap is arranged between the outer wall of the buffer member and the inner wall of the guide portion.

7. The energy storage device of claim 4, wherein, The inner wall of the guide portion is provided with an exhaust groove, the exhaust groove being used for discharging heat generated by the winding core.

8. The energy storage device of claim 7, wherein, The end surface of the side of the winding core facing the cover plate and the buffer member divide the cavity of the housing into a first space and a second space along the axial direction of the main body portion, the second space being in communication with the first space through the exhaust groove.

9. The energy storage device of claim 7, wherein, The exhaust groove is arranged extending along the axial direction of the main body portion; And / or, the exhaust groove is arranged in the mounting portion and / or the guide portion; And / or, the length of the exhaust groove is greater than or equal to the height of the mounting portion along the axial direction of the main body portion; And / or, the number of the exhaust grooves is multiple, and the multiple exhaust grooves are arranged along the circumferential direction of the main body portion.

10. An energy storage system characterized by, The energy storage device comprises any one of claims 1-9.

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