Energy storage device and electric equipment

Abstract

The utility model discloses an energy storage device and electric equipment. The energy storage device comprises a box body, a fan and a battery module. The box body is provided with a containing space, a first air opening and a second air opening, the fan is installed on the box body and corresponds to the first air opening. The battery module is accommodated in the accommodating space; the battery module comprises a plurality of single batteries arranged side by side, each single battery comprises a shell, an electrode assembly and an insulating coating, the shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity, the surface of the side, opposite to the electrode assembly, of the shell is coated with the insulating coating, and the insulating coating is made of nanometer materials.

Description

Technical Field

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

[0002] The battery pack is accompanied by intense movement of electrons during charging or discharging, which inevitably generates heat. Therefore, how to effectively cool the battery pack is an important factor affecting the reliable operation of the battery pack. Utility Model Content

[0003] The embodiments of the present application provide an energy storage device and an electrical device to improve the cooling effect of the energy storage device to a certain extent.

[0004] The energy storage device of the embodiment of the present application includes:

[0005] A box body having a containing space and a first air outlet and a second air outlet communicating with the containing space;

[0006] a fan, installed in the box and corresponding to the first air outlet; and

[0007] A battery module is accommodated in the accommodating space; the battery module includes a plurality of single cells arranged side by side, each of the single cells includes a shell, an electrode assembly and an insulating coating, the shell has a accommodating cavity, the electrode assembly is arranged in the accommodating cavity, the insulating coating is coated on one side of the shell facing away from the electrode assembly, and the insulating coating is a nano material.

[0008] In the embodiment of the present application, the outer surface of the shell of the single cell of the energy storage device is coated with an insulating coating, and the insulating coating is a nano material, so that the insulating coating forms an uneven surface, thereby forming radiation heat transfer, so that the insulating coating can absorb the heat generated inside the single cell, and conduct the heat outward to dissipate the heat. At the same time, under the action of the fan, air can flow in the first air outlet and the second air outlet to bring the heat conducted by the insulating coating out of the box. Therefore, under the joint action of the fan and the insulating coating, the cooling efficiency of the energy storage device of the embodiment of the present application is significantly improved, ensuring the reliable operation of the energy storage device. In addition, the insulating coating can play an insulating effect, so the insulating film coated on the periphery of the single cell in the prior art can be omitted, and the insulating coating can be directly coated on the outer surface of the shell, so that the heat generated inside the single cell is more easily conducted to the insulating coating for diffusion.

[0009] Optionally, the thickness of the insulating coating is 3 μm to 10 μm.

[0010] In the embodiment of the present application, by designing the thickness of the insulating coating to be within the range of 3 μm to 10 μm, the insulating coating is not too thick, thus saving material costs, while ensuring that the insulating coating can form radiation heat transfer to improve heat dissipation efficiency.

[0011] Optionally, the particle size of the nanomaterial is 10nm to 50nm.

[0012] Optionally, the nanomaterial is one of silicon, magnesium, and diamond powder.

[0013] Optionally, the box body includes two end panels, the two end panels are arranged opposite to each other along the arrangement direction of the plurality of single batteries, and the battery module is arranged between the two end panels;

[0014] One of the end panels is provided with the first air outlet, and the fan is installed on the end panel; the other end panel is provided with the second air outlet.

[0015] In the embodiment of the present application, since the two end panels are relatively arranged in the length direction (first direction) of the battery module, the first air outlet and the second air outlet are relatively arranged in the length direction of the battery module. When the fan is working, the air can pass through the first air outlet and the second air outlet quickly without forming a turbulent state in the box, thereby improving the heat exchange efficiency.

[0016] Optionally, there are multiple battery modules, and the multiple battery modules are arranged side by side along the width direction of the battery module, and a first air duct is provided between two adjacent battery modules;

[0017] In the length direction of the battery module, at least one of the first air ducts corresponds to the position of the fan.

[0018] In the embodiment of the present application, the first air duct between two adjacent battery modules corresponds to the position of the fan, so that when the fan is started, the cold air outside the box can quickly pass through the first air duct without being retained in the box, thereby improving the heat exchange efficiency.

[0019] Optionally, the box body further comprises two side panels, the two side panels are arranged opposite to each other along the width direction of the battery module, and both ends of each side panel in the length direction are respectively connected to the two end panels, and the two end panels and the two side panels together enclose the accommodation space for accommodating the battery module;

[0020] In the width direction of the battery module, a second air duct is formed between two of the battery modules located at the outermost sides of the plurality of battery modules and the two side plates respectively.

[0021] In the embodiment of the present application, for each battery module, air ducts are provided on both sides thereof in the width direction, so that the heat exchange area between the cold air and each battery module can be increased, thereby improving the heat exchange efficiency.

[0022] Optionally, a third air outlet is provided at one end of the side plate close to the second air outlet, and the third air outlet is connected to the second air duct.

[0023] In the embodiment of the present application, a third air outlet connected to the second air duct is provided at one end of the side panel close to the second air outlet, so that cold air can quickly enter and exit the box, further improving the heat exchange efficiency.

[0024] Optionally, the insulating coating includes a base layer and fins, the base layer is coated on a surface of the shell facing away from the electrode assembly, and the fins are protruding from a surface of the base layer facing away from the shell.

[0025] In the embodiment of the present application, after the insulating coating is coated on the outer surface of the shell, the nanoparticles in the insulating coating will stack and form fins. The formation of fins will significantly increase the surface area of ​​the insulating coating (compared to the flat surface, the surface area of ​​the fins has increased by 2000 to 3000 times), thereby improving the heat dissipation performance of the insulating coating. In addition, the higher the temperature of the battery cell, the higher the radiation heat transfer of the fin structure accounts for the total heat release of the battery cell, which is conducive to dissipating as much heat generated by the battery cell as possible to the outside of the insulating coating, and cooperate with the air cooling of the fan to bring the heat out of the box, so as to achieve the purpose of improving the heat exchange efficiency.

[0026] The electric equipment of the embodiment of the present application comprises the energy storage device described in any one of the above items, and the energy storage device supplies power to the electric equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a household energy storage system according to an exemplary embodiment.

[0028] Figure 2 is an exploded schematic diagram of a battery pack according to an exemplary embodiment.

[0029] Figure 3 is an exploded schematic diagram of a single battery according to an exemplary embodiment.

[0030] Figure 4 yes Figure 2 Schematic diagram of a top view of the battery pack with the upper cover omitted.

[0031] Figures 5 to 8 Shown are partial cross-sectional views of four different embodiments of insulating coating applied to the outer surface of the housing.

[0032] Fig. 9is a schematic diagram showing an electric device according to an exemplary embodiment.

[0033] The reference numerals are described as follows:

[0034] 1. Energy storage device;

[0035] 2. Electric energy conversion device;

[0036] 3. User load;

[0037] 4. Electrical equipment;

[0038] 100, box body; 101, accommodating space; 102, first air outlet; 103, second air outlet; 104, first air duct; 105, second air duct; 106, third air outlet; 110, end panel; 120, side panel; 130, bottom panel;

[0039] 200, fan;

[0040] 300, battery module; 310, single cell; 311, shell; 312, electrode assembly; 313, insulating coating; 313a, base layer; 313b, fin; 314, end cap assembly; 314a, cover plate; 314b, pole; 314c, explosion-proof valve; 320, end plate; 330, cable tie;

[0041] 400, upper cover;

[0042] D1, first direction; D2, second direction; D3, third direction. DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0044] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or components that are inherent to these processes, methods, products, or devices.

[0045] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same way or convert it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0046] The current green energy mainly includes solar energy, wind energy, hydropower, etc. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0047] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0048] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0049] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0050] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0051] Take the household energy storage scenario in user-side energy storage as an example to illustrate. Figure 1A household energy storage system is shown, which includes an energy storage device 1 and an electric energy conversion device 2 (such as a photovoltaic panel), and a user load 3 (such as a street lamp, household appliances, etc.). The energy storage device 1 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the electric energy conversion device 2 can convert solar energy into electric energy during the period of low electricity prices, and store it through the energy storage device 1, and then supply the user load 3 for use during the peak electricity price, or supply the user load 3 for use when the power grid is out of power / power outage.

[0052] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 1 includes at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through 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 at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where electric energy is scarce for use.

[0053] The present application embodiment provides an energy storage device 1, which may be, but is not limited to, a battery pack, and an energy storage cabinet or energy storage container formed by a battery pack, etc. Next, the energy storage device 1 is described in detail by taking the battery pack as an example.

[0054] like Figure 2 As shown, the energy storage device 1 of the embodiment of the present application includes a box body 100, a battery module 300 and an upper cover 400. The box body 100 has a receiving space 101, the battery module 300 is received in the receiving space 101 of the box body 100, and the upper cover 400 is connected to the box body 100, and the upper cover 400 closes the opening of the box body 100 to close the battery module 300 in the receiving space 101.

[0055] It is understandable that the shape of the upper cover 400 and the box body 100 connected together can be determined according to the shape of the battery module 300. For example, in the embodiment of the present application, the upper cover 400 and the box body 100 are connected to form a hollow cuboid, but this is not limited to this.

[0056] As an example, the box body 100 is in the shape of a cuboid with an opening, and the upper cover 400 is in the shape of a plate. The upper cover 400 is buckled into the opening of the box body 100 to form a chamber for accommodating the battery module 300 .

[0057] Of course, in other embodiments, the box body 100 and the upper cover 400 are both in a rectangular shape and have an opening on one side, the opening of the box body 100 is arranged opposite to the opening of the upper cover 400, and the box body 100 and the upper cover 400 are buckled together to form a chamber for accommodating the battery module 300.

[0058] Please continue reading Figure 2 As shown, the box body 100 includes a bottom plate 130 , two end panels 110 and two side panels 120 .

[0059] For convenience of description, the length direction of the battery module 300 is defined as the first direction D1, the width direction of the battery module 300 is defined as the second direction D2, and the height direction of the battery module 300 is defined as the third direction D3. The first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other.

[0060] The bottom plate 130 and the upper cover 400 are arranged opposite to each other in the third direction D3. The two end panels 110 are arranged opposite to each other in the first direction D1, and the two end panels 110 are respectively connected to the two ends of the bottom plate 130 along the first direction D1. The two side panels 120 are arranged opposite to each other in the second direction D2, and the two side panels 120 are respectively connected to the two ends of the bottom plate 130 along the second direction D2, and the two ends of each end panel 110 along the second direction D2 are respectively connected to the two side panels 120. The bottom plate 130, the two end panels 110 and the two side panels 120 together enclose a storage space 101 for accommodating the battery module 300.

[0061] It is understandable that the bottom plate 130 and the side plate 120 may be separate structures or may be an integrated structure.

[0062] like Figure 2 As shown, for the battery module 300, the number can be one or more, and multiple means more than two. When the number of battery modules 300 is multiple, the multiple battery modules 300 are arranged along the width direction (second direction D2) of the battery module 300. In addition, the multiple battery modules 300 can be connected in series, parallel or mixed. Among them, mixed means that multiple battery modules 300 are connected in series and parallel.

[0063] The battery module 300 includes a plurality of single cells 310 arranged side by side. The plurality of single cells 310 included in the battery module 300 may be connected in series, in parallel, or in a mixed manner.

[0064] The battery module 300 further includes two end plates 320 and a tie 330 . The two surfaces of the two single cells 310 at the two ends of the battery module 300 in the first direction D1 facing away from each other are respectively provided with an end plate 320 , and the tie 330 is sleeved around the two end plates 320 and the outer peripheries of the multiple single cells 310 .

[0065] The single cell 310 may be a lithium ion battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc. The single cell 310 may be cylindrical, flat, rectangular, etc. In addition, the single cell 310 may be a soft pack battery or a hard shell battery, which is not limited in the embodiment of the present application. Next, the energy storage device 1 is explained in detail by taking the single cell 310 as a hard shell square single cell as an example.

[0066] like Figure 3 As shown, the single battery 310 includes a housing 311, an electrode assembly 312 and an end plate 320. The housing 311 includes a receiving cavity with an opening, the electrode assembly 312 is received in the receiving cavity of the housing 311, and the end plate 320 is connected to the housing 311 and closes the opening of the housing 311.

[0067] Among them, the electrode assembly 312 may include a positive electrode sheet, a negative electrode sheet and a separator. The single cell 310 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer, and the negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The material of the isolation film may be PP or PE, etc. In addition, the electrode assembly 312 may be a winding structure or a stacked structure, but the embodiment of the present application is not limited thereto.

[0068] The end cap assembly 314 includes a cover plate 314a, a pole 314b and an explosion-proof valve 314c. The cover plate 314a is connected to the housing 311, and the pole 314b and the explosion-proof valve 314c are installed on the cover plate 314a. The number of poles 314b can be two, a positive pole and a negative pole. The explosion-proof valve 314c is used to explode and discharge the gas generated in the housing 311 when the gas pressure of the single battery 310 reaches a certain threshold, so as to avoid battery bulging or even explosion, thereby improving the safety of the energy storage device 1.

[0069] like Figure 2 and Figure 3As shown, the box body 100 also has a first air outlet 102 and a second air outlet 103 connected to the accommodating space 101; the energy storage device 1 also includes a fan 200, which is installed on the box body 100 and corresponds to the first air outlet 102; each single battery 310 also includes an insulating coating 313, which is coated on one side of the shell 311 facing away from the electrode assembly 312, and the insulating coating 313 is a nano material.

[0070] It should be noted that in the related art, there are roughly three types of cooling methods for battery packs: air cooling, liquid cooling, and natural cooling. Among them, air cooling uses air as a heat exchange medium, and the heat is removed by air flow, and air cooling has the problem of low cooling efficiency. Liquid cooling removes heat through the coolant flowing in the liquid cooling plate, and has a higher cooling efficiency. However, since the liquid cooling method requires the arrangement of liquid cooling pipes, liquid cooling plates, liquid cooling units, etc., it occupies a large space, which reduces the integration rate of the battery pack; and liquid cooling pipes and liquid cooling plates are prone to condensation. Natural cooling does not set up additional devices for heat exchange, so there is a problem of low cooling efficiency.

[0071] In the embodiment of the present application, the outer surface of the shell 311 of the single cell 310 of the energy storage device 1 is coated with an insulating coating 313, and the insulating coating 313 is a nano material, so that the insulating coating 313 forms an uneven surface, thereby forming radiation heat transfer, so that the insulating coating 313 can absorb the heat generated inside the single cell 310, and conduct the heat outward for heat dissipation. At the same time, under the action of the fan 200, air can flow through the first air outlet 102 and the second air outlet 103 to take the heat conducted by the insulating coating 313 out of the box 100. Therefore, under the joint action of the fan 200 and the insulating coating 313, the cooling efficiency of the energy storage device 1 of the embodiment of the present application is significantly improved, ensuring the reliable operation of the energy storage device 1. Compared with the liquid cooling method used in the related art, the embodiment of the present application omits the liquid cooling plate, liquid cooling pipeline and liquid cooling unit, which is conducive to improving the integration of the energy storage device 1. In addition, the insulating coating 313 can also improve the waterproof and hydrophobic performance and high temperature resistance of the single cell 310, thereby ensuring the safety of the single cell 310. In addition, the insulating coating 313 can play an insulating effect, so the insulating film wrapped around the outer periphery of the single cell 310 in the prior art can be omitted, and the insulating coating 313 can be directly coated on the outer surface of the shell 311, so that the heat generated inside the single cell 310 is more easily transferred to the insulating coating 313 for diffusion.

[0072] In one embodiment, the thickness t of the insulating coating 313 (eg Figure 5 ) is 3μm to 10μm, for example, t is 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm or 10μm.

[0073] In the embodiment of the present application, by designing the thickness t of the insulating coating 313 to be within the range of 3 μm to 10 μm, the insulating coating 313 is not too thick, thus saving material costs, while ensuring that the insulating coating 313 can form radiation heat transfer to improve heat dissipation efficiency.

[0074] In one embodiment, the particle size of the nanomaterial is 10 nm to 50 nm, for example, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm or 50 nm.

[0075] The nanomaterial is an inorganic mineral, for example, the nanomaterial is one of silicon, magnesium, and diamond powder, or a combination of silicon, magnesium, and diamond powder.

[0076] like Figure 2 As shown, among the two end panels 110 included in the box body 100 , one of the end panels 110 is provided with a first air outlet 102 , and the fan 200 is installed on the end panel 110 ; and the other end panel 110 is provided with a second air outlet 103 .

[0077] In the embodiment of the present application, since the two end panels 110 are relatively arranged in the length direction (first direction D1) of the battery module 300, the first air outlet 102 and the second air outlet 103 are relatively arranged in the length direction of the battery module 300. When the fan 200 is working, the air can quickly pass through the first air outlet 102 and the second air outlet 103 without forming a turbulent state in the box body 100, thereby improving the heat exchange efficiency.

[0078] Among them, the fan 200 can be used for sucking air or blowing air. In one embodiment, the fan 200 is used for sucking air, and the cold air from the outside of the box 100 enters the inside of the box 100 from the second air port 103 and flows out from the first air port 102. In the process of the cold air entering from the second air port 103 and flowing out from the first air port 102, the heat emitted from the insulating coating 313 to the outside of the battery module 300 during the charging and discharging process can be taken away. In another embodiment, the fan 200 is used for blowing air, and the cold air from the outside of the box 100 enters the inside of the box 100 from the first air port 102 and flows out from the second air port 103. In the process of the cold air entering from the first air port 102 and flowing out from the second air port 103, the heat emitted from the insulating coating 313 to the outside of the battery module 300 during the charging and discharging process can be taken away.

[0079] In addition, the number of the fans 200 may be one or more, which is not limited in the present application.

[0080] Taking the case where there are multiple fans 200 as an example, in one embodiment, multiple fans 200 can be installed on the same end panel 110, and all fans 200 are used for blowing or sucking air. In this case, the end panel 110 is provided with multiple first air ports 102 corresponding to the number of fans 200. In another embodiment, fans 200 are provided on both end panels 110, and the fan 200 on one end panel 110 is used for sucking air, and the fan 200 on the other end panel 110 is used for blowing air.

[0081] The present application does not specifically limit the number and shape of the second air outlet 103. For example, there may be one second air outlet 103 on the end panel 110, and the opening area of ​​the second air outlet 103 is relatively large. Alternatively, there may be multiple second air outlets 103 on the end panel 110, and the opening area of ​​each second air outlet 103 is relatively small.

[0082] In the embodiment of the present application, the end panel 110 is provided with a plurality of second air ports 103, and the opening area of ​​each second air port 103 is relatively small, so that the structural strength of the box body 100 can be ensured on the basis of ventilation and heat dissipation.

[0083] like Figure 4 As shown, there are multiple battery modules 300, and the multiple battery modules 300 are arranged side by side along the width direction (second direction D2) of the battery module 300, and a first air duct 104 is provided between two adjacent battery modules 300; in the length direction (first direction D1) of the battery module 300, at least one first air duct 104 corresponds to the position of the fan 200.

[0084] In the embodiment of the present application, the first air duct 104 between two adjacent battery modules 300 corresponds to the position of the fan 200, so that when the fan 200 is started, the cold air outside the box 100 can quickly pass through the first air duct 104 without being stagnant in the box 100, thereby improving the heat exchange efficiency.

[0085] It is understandable that when the number of battery modules 300 is at least three, at least two first air ducts 104 are formed in at least three battery modules 300, the number of fans 200 can be at least two, and at least two fans 200 correspond to at least two second air ducts 105 respectively in the first direction D1.

[0086] Please continue reading Figure 4 In the width direction (second direction D2) of the battery module 300, the second air duct 105 is formed between the two outermost battery modules 300 among the plurality of battery modules 300 and the two side plates 120 respectively.

[0087] Taking the number of battery modules 300 as two as an example, in the embodiment of the present application, a first air duct 104 is provided between two adjacent battery modules 300, and a second air duct 105 is provided between each battery module 300 and the corresponding side plate 120. When the fan 200 is used for blowing air, the cold air outside the box 100 enters the box 100 from the first air port 102, flows through the first air duct 104 and the two second air ducts 105, and then flows out from the second air port 103, thereby taking away the heat generated by each battery module 300.

[0088] Therefore, in the embodiment of the present application, for each battery module 300, air ducts are provided on both sides thereof in the width direction, so that the heat exchange area between the cold air and each battery module 300 can be increased, thereby improving the heat exchange efficiency.

[0089] Please return to Figure 2 , a third air port 106 is provided at one end of the side plate 120 near the second air port 103, and the third air port 106 is connected to the second air duct 105. In one embodiment, when the fan 200 is used for suction, the cold air from outside the box 100 can enter the first air duct 104 from the second air port 103, and enter the second air duct 105 from the second air port 103 and the third air port 106, thereby taking away the heat generated by the battery module 300 during the charging and discharging process. In another embodiment, when the fan 200 is used for blowing, the cold air from outside the box 100 enters the inside of the box 100 from the first air port 102, the air flowing through the first air duct 104 can flow out from the second air port 103, and the air flowing through the second air duct 105 can flow out from the second air port 103 and the third air port 106, thereby taking away the heat generated by the battery module 300 during the charging and discharging process.

[0090] Therefore, in the embodiment of the present application, a third air outlet 106 connected to the second air duct 105 is provided at one end of the side plate 120 close to the second air outlet 103, so that cold air can quickly enter and exit the box body 100, further improving the heat exchange efficiency.

[0091] The present application does not specifically limit the number and shape of the third air outlet 106. For example, there may be one third air outlet 106 on the side plate 120, and the opening area of ​​the third air outlet 106 is relatively large. Alternatively, there may be multiple third air outlets 106 on the side plate 120, and the opening area of ​​each third air outlet 106 is relatively small.

[0092] In the embodiment of the present application, the side plate 120 is provided with a plurality of third air vents 106, and the opening area of ​​each third air vent 106 is relatively small. In this way, the structural strength of the box body 100 can be ensured on the basis of ventilation and heat dissipation.

[0093] like Figure 5As shown, the insulating coating 313 includes a base layer 313 a and fins 313 b . The base layer 313 a is coated on a surface of the shell 311 facing away from the electrode assembly 312 , and the fins 313 b are protruding from a surface of the base layer 313 a facing away from the shell 311 .

[0094] In the embodiment of the present application, after the insulating coating 313 is coated on the outer surface of the shell 311, the nanoparticles in the insulating coating 313 will stack and form fins 313b. The formation of fins 313b will significantly increase the surface area of ​​the insulating coating 313 (compared to the flat surface, the surface area of ​​fins 313b is increased by 2000 to 3000 times), thereby improving the heat dissipation performance of the insulating coating 313. In addition, the higher the temperature of the battery cell, the higher the radiation heat transfer of the fin 313b structure accounts for the total heat release of the battery cell, which is conducive to dissipating as much heat generated by the battery cell as possible to the outside of the insulating coating 313, and cooperate with the air cooling of the fan 200 to bring the heat out of the box 100, so as to achieve the purpose of improving the heat exchange efficiency.

[0095] It should be noted that the thickness t of the insulating coating 313 refers to the distance between the tip of the fin 313 b and the surface of the base layer 313 a facing the housing 311 .

[0096] It is understandable that the cross-sectional shape of the fin 313b is not limited to Figure 5 In other embodiments, the cross-sectional shape of the fin 313b may also be as shown in FIG. Figure 6 The trapezoid shown, Figure 7 The rectangle shown, Figure 8 The tip shown is round or has other special shapes, which is not particularly limited in the present application.

[0097] like Fig. 9 As shown, the embodiment of the present application further provides an electric device 4, which includes the energy storage device 1 described in any of the above embodiments, and the energy storage device 1 supplies power to the electric device 4. In this way, for the electric device 4 including the energy storage device 1 described above, the working stability of the electric device 4 can be improved, the probability of the electric device 4 downtime can be reduced, and the safety of the use of the electric device 4 can be improved.

[0098] It is understandable that the various embodiments / implementations provided in the present application can be combined with each other without causing any contradiction, and will not be illustrated one by one here.

[0099] In the application embodiments, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0100] In the description of the application embodiments, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the application embodiments.

[0101] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0102] The above are only preferred embodiments of the application embodiments and are not intended to limit the application embodiments. For those skilled in the art, the application embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. An energy storage device, characterized in that: include: A box body having a containing space and a first air outlet and a second air outlet communicating with the containing space; A fan, installed in the box and corresponding to the first air outlet; as well as A battery module is accommodated in the accommodating space; the battery module includes a plurality of single cells arranged side by side, each of the single cells includes a shell, an electrode assembly and an insulating coating, the shell has a accommodating cavity, the electrode assembly is arranged in the accommodating cavity, the insulating coating is coated on one side of the shell facing away from the electrode assembly, and the insulating coating is a nano material.

2. The energy storage device according to claim 1, characterized in that: The thickness of the insulating coating is 3 μm to 10 μm.

3. The energy storage device according to claim 1, characterized in that: The particle size of the nano material is 10nm to 50nm.

4. The energy storage device according to claim 1, characterized in that: The nano material is one of silicon, magnesium and diamond powder.

5. The energy storage device according to any one of claims 1 to 4, characterized in that: The box body comprises two end panels, the two end panels are arranged opposite to each other along the arrangement direction of the plurality of single batteries, and the battery module is arranged between the two end panels; One of the end panels is provided with the first air outlet, and the fan is installed on the end panel; the other end panel is provided with the second air outlet.

6. The energy storage device according to claim 5, characterized in that: There are multiple battery modules, and the multiple battery modules are arranged side by side along the width direction of the battery module, and a first air duct is provided between two adjacent battery modules; In the length direction of the battery module, at least one of the first air ducts corresponds to the position of the fan.

7. The energy storage device according to claim 6, characterized in that: The box body further includes two side panels, which are arranged opposite to each other along the width direction of the battery module, and both ends of each side panel in the length direction are respectively connected to the two end panels, and the two end panels and the two side panels together enclose the accommodation space for accommodating the battery module; In the width direction of the battery module, a second air duct is formed between two of the battery modules located at the outermost sides of the plurality of battery modules and the two side plates respectively.

8. The energy storage device according to claim 7, characterized in that: A third air outlet is provided at one end of the side plate close to the second air outlet, and the third air outlet is communicated with the second air duct.

9. The energy storage device according to claim 1, characterized in that: The insulating coating comprises a base layer and fins. The base layer is coated on a surface of the shell facing away from the electrode assembly, and the fins are protruding from a surface of the base layer facing away from the shell.

10. An electrical device, characterized in that: The energy storage device comprises the energy storage device according to any one of claims 1 to 9, wherein the energy storage device supplies power to the electrical equipment.

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