High-capacity high-voltage water-based sodium-ion battery energy storage equipment

Abstract

The utility model provides high-capacity high-voltage water-based sodium-ion battery energy storage equipment, which comprises a water-based sodium-ion battery cell, a high-voltage storage battery and a high-voltage storage battery, the current collecting assemblies are respectively connected to two opposite sides of all the water-based sodium ion battery cells; and the supporting assemblies are connected between every two adjacent flow collecting assemblies in an abutting mode. The water-based sodium ion battery cells and the current collecting assemblies are alternately arranged, supporting connection of the whole structure of the battery pack is achieved through the supporting assemblies, the risk of thermal runaway can be fundamentally reduced, safety and stability in the using process can be ensured even if a plurality of battery cells are assembled in series, and meanwhile the service life of the battery pack is prolonged. The battery pack has high strength through mutual cooperation between the current collecting assembly and the supporting assembly, so that the use effect is further improved, in addition, the overall thickness of the battery pack can be flexibly adjusted according to the actual use scene, and the battery pack is convenient to use. Therefore, the device has the remarkable advantages of being stable in structure, high in use safety, wide in application range, flexible to adjust, low in production cost and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of battery equipment, and specifically refers to a large-capacity and high-voltage aqueous sodium ion battery energy storage device. Background Art

[0002] In modern battery technology, the voltage of a battery pack is usually increased by connecting multiple battery cells or modules in series. This voltage increase is critical for electric vehicles and other devices that require high voltage drive. However, the traditional method of assembling batteries in series has multiple problems that limit the performance and economics of the battery pack.

[0003] First, the series connection of battery cells or modules will result in "dead zones" inside the battery pack that do not provide energy. These areas are caused by the physical size and connection method of the battery cells, thereby reducing the overall energy density of the battery pack. This means that although the voltage is increased, the actual available energy storage capacity has not increased accordingly.

[0004] Secondly, as the number of battery cells in a battery pack increases, the difficulty of thermal management also increases. In large-capacity battery packs connected in series, the risk of thermal runaway increases significantly, which may cause the battery pack to overheat and even cause a fire or explosion. Therefore, there are strict restrictions on the number of batteries connected in series in practical applications, which further limits the voltage and energy upper limit of the battery pack.

[0005] In addition, the traditional battery series assembly method requires additional external circuits and connectors, which not only increases the complexity of the system, but also increases costs and potential failure points. In actual operation, these additional components and steps make the assembly of battery packs cumbersome, increasing production time and cost.

[0006] To solve these problems, aqueous sodium-ion batteries have become a promising alternative due to their high safety, low cost and environmental friendliness. Sodium-ion batteries do not produce lithium dendrites during use, thereby reducing the risk of short circuit and thermal runaway. However, there is currently a lack of effective compatible assembly methods in the industry, which limits the application of sodium-ion batteries in series-assembled battery packs. Summary of the invention

[0007] To this end, the technical problem to be solved by the utility model is to overcome the problem that it is difficult to achieve large-capacity and high-voltage series connection of battery packs in the prior art, and to provide a large-capacity and high-voltage aqueous sodium ion battery energy storage device.

[0008] In order to solve the above technical problems, the utility model provides a large-capacity and high-voltage aqueous sodium ion battery energy storage device, which includes an energy storage container and a plurality of battery cells. The plurality of battery cells are combined and filled in the energy storage container and matched with the size of the container body. One of the battery cells includes: at least two aqueous sodium ion cells, at least two aqueous sodium ion cells are arranged in the same direction; a plurality of current collecting components, in the arrangement direction of the aqueous sodium ion cells, the plurality of current collecting components are respectively connected to the opposite sides of all the aqueous sodium ion cells to achieve electrical conduction between two adjacent aqueous sodium ion cells; a plurality of support components, the plurality of support components are respectively abutted between two adjacent current collecting components, the support components and the two abutted current collecting components jointly enclose a closed accommodation space, at least two aqueous sodium ion cells are respectively arranged in the corresponding accommodation space, and the accommodation space is filled with electrolyte, wherein the internal capacity of any aqueous sodium ion cell is not less than 300Ah, and the accommodation space matches the size of the aqueous sodium ion cell.

[0009] In one embodiment of the present invention, the aqueous sodium ion battery cell comprises a positive electrode sheet, a negative electrode sheet and a separator. In the arrangement direction of the aqueous sodium ion battery cell, the positive electrode sheet and the negative electrode sheet are respectively arranged on opposite sides of the separator.

[0010] In one embodiment of the present invention, the area of ​​the diaphragm is not less than that of the positive electrode sheet and / or the negative electrode sheet.

[0011] In one embodiment of the present invention, the thickness of the positive electrode sheet and / or the negative electrode sheet is 1.0-4.0 mm, and the porosity of the positive electrode sheet and / or the negative electrode sheet is 40-60%.

[0012] In one embodiment of the present invention, the support assembly is configured as: an elastic frame structure arranged around the aqueous sodium ion battery cells in a direction perpendicular to the arrangement direction of the aqueous sodium ion battery cells.

[0013] In one embodiment of the utility model, the current collecting assembly includes a conductive substrate and two conductive films. In the arrangement direction of the aqueous sodium ion battery cells, the two conductive films are respectively arranged on opposite sides of the conductive substrate, and the supporting assembly is connected to the conductive films.

[0014] In one embodiment of the present invention, the conductive film is provided with a waterproof structure.

[0015] In one embodiment of the utility model, in a direction perpendicular to the arrangement direction of the aqueous sodium ion battery cells, the area of ​​the accommodating space is S1, the area of ​​the conductive substrate is S2, and the area of ​​the conductive film is S3, wherein S1<S2<S3.

[0016] The utility model also provides an energy storage device, which includes at least one of the above-mentioned large-capacity and high-voltage aqueous sodium ion battery energy storage devices and an energy storage container, and at least one of the large-capacity and high-voltage aqueous sodium ion battery energy storage devices is arranged inside the energy storage container.

[0017] In one embodiment of the utility model, a control component is provided inside the energy storage container, and at least one of the large-capacity and high-voltage aqueous sodium-ion battery energy storage devices is connected to the control component.

[0018] In one embodiment of the present invention, the control component includes a battery management system, a power distribution automation system and a battery pack detection system.

[0019] The utility model also provides an electrical device, which comprises at least one of the above-mentioned large-capacity and high-voltage aqueous sodium ion battery energy storage devices.

[0020] The above technical solution of the utility model has the following advantages compared with the prior art:

[0021] In the large-capacity and high-voltage aqueous sodium-ion battery energy storage device described in the utility model, aqueous sodium-ion cells and current collecting components are alternately arranged, and the supporting connection of the overall structure of the battery pack is realized by the supporting component, wherein the aqueous sodium-ion cells can fundamentally reduce the risk of thermal runaway, especially after multiple cells are assembled in series, it can also ensure safety and stability during use, and at the same time, through the mutual cooperation between the current collecting component and the supporting component, the battery pack can achieve good electrical conduction while having high strength, thereby further improving the use effect, and most importantly, the cell capacity in the present application matches the size of the supporting component, and the size of multiple battery cells matches the size of the energy storage container, thereby achieving large capacity and high voltage of the battery pack while making full use of the space, compared with conventional battery packs at this stage, the present application has the significant advantages of stable structure, high safety in use, wide application range, flexible adjustment and low production cost, and is a new large-capacity and high-voltage aqueous sodium-ion battery energy storage device with broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the layer structure of a battery cell in a large-capacity and high-voltage aqueous sodium-ion battery energy storage device in a preferred embodiment of the utility model;

[0024] Figure 2 yes Figure 1The charge and discharge curves of the battery cell shown;

[0025] Figure 3 yes Figure 1 The structural schematic diagram of the large-capacity and high-voltage aqueous sodium-ion battery energy storage device shown;

[0026] Figure 4 It is a schematic diagram of the layer structure of a battery cell in a large-capacity and high-voltage aqueous sodium ion battery energy storage device in another embodiment of the utility model.

[0027] Explanation of the reference numerals in the specification: 100, battery cell; 110, aqueous sodium ion battery cell; 111, positive electrode sheet; 112, negative electrode sheet; 113, diaphragm; 120, current collecting assembly; 121, conductive substrate; 122, conductive film; 130, supporting assembly; 200, energy storage container. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0029] Embodiment 1

[0030] See also Figure 1 As shown, this embodiment provides a large-capacity and high-voltage aqueous sodium ion battery energy storage device, which includes an energy storage container 200 and a plurality of battery cells 100. The plurality of battery cells 100 are assembled and filled in the energy storage container 200 and match the size of the energy storage container 200. One of the battery cells 100 includes: at least two aqueous sodium ion batteries 110, at least two aqueous sodium ion batteries 110 are arranged in the same direction; a plurality of current collecting assemblies 120, in the arrangement direction of the aqueous sodium ion batteries 110, the plurality of current collecting assemblies 120 are respectively connected to the opposite sides of all the aqueous sodium ion batteries 110. On both sides, to achieve electrical conduction between two adjacent aqueous sodium ion battery cells 110; a plurality of support components 130, wherein the plurality of support components 130 are respectively abutted between two adjacent current collecting components 120, and the support components 130 and the two current collecting components 120 abutted therewith jointly enclose a closed accommodation space, at least two aqueous sodium ion battery cells 110 are respectively arranged inside the corresponding accommodation space, and the accommodation space is filled with electrolyte, wherein the internal capacity of any aqueous sodium ion battery cell 110 is not less than 300Ah, and the accommodation space matches the size of the aqueous sodium ion battery cell 110.

[0031] The battery cell 100 described in this embodiment realizes the support connection of the overall structure of the battery pack through the mutual cooperation between the aqueous sodium ion battery cell 110 and the current collecting assembly 120 and the supporting assembly 130, wherein the aqueous sodium ion battery cell 110 can fundamentally reduce the risk of thermal runaway, especially after multiple battery cells are assembled in series, it can also ensure safety and stability during use. At the same time, through the mutual cooperation between the current collecting assembly 120 and the supporting assembly 130, the battery pack can achieve good electrical conduction while having high strength, thereby further improving the use effect. Most importantly, the battery cell capacity in the present application matches the size of the supporting assembly, and the size of the multiple battery cells matches the size of the energy storage container, thereby achieving large capacity and high voltage of the battery pack while making full use of the space. Compared with conventional battery packs at this stage, the present application has significant advantages such as stable structure, high safety in use, wide range of application, flexible adjustment and low production cost.

[0032] In this embodiment, the aqueous sodium ion battery cell 110 includes a positive electrode sheet 111, a negative electrode sheet 112 and a diaphragm 113. In the arrangement direction of the aqueous sodium ion battery cell 110, the positive electrode sheet 111 and the negative electrode sheet 112 are respectively arranged on opposite sides of the diaphragm 113, wherein the area of ​​the diaphragm 113 is not less than the positive electrode sheet 111 and the negative electrode sheet 112, thereby avoiding a short circuit between the positive electrode sheet 111 and the negative electrode sheet 112. Further, in this embodiment, the substrate of the negative electrode sheet 112 is Na2Ti2(PO4)3 (sodium titanium phosphate), the substrate of the positive electrode sheet 111 is NaMnO2 (potassium permanganate disodium), and acetylene black and carbon nanotubes are used as conductive agents. The thickness of the positive electrode sheet 111 and the negative electrode sheet 112 are both 1.4 mm, the size of both is 6×6 cm, and the porosity is 50%. Furthermore, the electrolyte in this embodiment is a 1 mol / L sodium sulfate aqueous solution. In other embodiments, the inorganic salt in the electrolyte can be one or more of sodium acetate, sodium formate, sodium chloride, and sodium nitrate. The specific concentration can be adjusted between 1 and 3 mol / L. The curve of the battery pack in this embodiment during the charge and discharge process can be shown in FIG. Figure 2 As shown, it can be seen that the battery pack capacity in this embodiment can be above 700 mAh.

[0033] In other embodiments, the area of ​​the diaphragm 113 needs to be no less than at least one of the positive electrode sheet 111 and the negative electrode sheet 112, the thickness of the positive electrode sheet 111 and / or the negative electrode sheet 112 can be set to 1.0-4.0 mm, the porosity of the positive electrode sheet 111 and / or the negative electrode sheet 112 can be set to 40-60%, and the size of the positive electrode sheet 111 and the negative electrode sheet 112 can be adjusted according to actual usage requirements, and the present invention does not impose any specific restrictions on this.

[0034] See also Figure 1 As shown, the support assembly 130 in this embodiment is configured as: an elastic frame structure arranged around the aqueous sodium ion battery cell 110 in a direction perpendicular to the arrangement direction of the aqueous sodium ion battery cell 110, thereby achieving an interference fit between the support assembly 130 and the current collecting assembly 120 to improve the sealing inside the accommodating space.

[0035] See also Figure 1 As shown, the current collecting assembly 120 includes a conductive substrate 121 and two conductive films 122. In the arrangement direction of the aqueous sodium ion battery 110, the two conductive films 122 are respectively arranged on the opposite sides of the conductive substrate 121, and the supporting assembly 130 connects the conductive films 122. Furthermore, the conductive substrate 121 can be preferably a metal with good conductivity such as aluminum and copper. In addition, the conductive film 122 is also provided with a waterproof structure, preferably a waterproof conductive polymer film. When connected, the conductive film 122 is bonded to both sides of the conductive substrate 121 with conductive glue, thereby giving the current collecting assembly 120 the effects of conductivity, support and waterproof sealing.

[0036] In this embodiment, in the direction perpendicular to the arrangement of the aqueous sodium ion battery cells 110, the area of ​​the accommodation space is S1, the area of ​​the conductive substrate 121 is S2, and the area of ​​the conductive film 122 is S3, wherein S1<S2<S3. On the one hand, since the conductive film 122 is soft, when S1<S2, it can ensure that the support assembly 130 and the conductive substrate 121 in the current collecting assembly 120 support and abut each other, thereby improving the structural stability of the battery pack. On the other hand, S2<S3 can make full use of the extrusion effect between the conductive film 122 and the support assembly 130 to ensure that the accommodation space always has a high degree of sealing.

[0037] The voltage range of the aqueous sodium ion battery 110 in this embodiment is 1.0-2.0V, and the rated voltage is 1.4-1.6V. To facilitate observation of its specific structure, Figure 1 Only two aqueous sodium ion batteries 110 are shown in the assembly structure. In this embodiment, the number of assembled layers is 240, so that the thickness of the assembled battery pack can match the subsequent housing. Furthermore, in this embodiment, the height of the assembled battery cell 100 is about 120 cm, and the size of all the support components 130 after assembly is 120×120 cm. Therefore, the accommodating space matches the size of multiple aqueous sodium ion batteries 110, ensuring that the capacity of the aqueous sodium ion batteries 110 reaches 300Ah and the rated voltage is 360V.

[0038] See also Figure 3As shown, in this embodiment, a plurality of battery cells 100 are combined and filled in the energy storage container 200. In this embodiment, a total of five battery cells 100 are provided. Furthermore, a control component is provided in the energy storage container 200, and at least one battery cell 100 is connected to the control component. Specifically, the control component includes a battery management system (PCS), a power distribution automation system (EMS), and a battery pack detection system (BMS).

[0039] Embodiment 2

[0040] See also Figure 4 As shown, this embodiment provides another large-capacity, high-voltage aqueous sodium-ion battery energy storage device, whose main structure and connection method are the same as those of the first embodiment, and no further details are given here. In this embodiment, in order to facilitate the preparation and installation of the current collecting assembly 120, the current collecting assembly 120 is preferably a coated metal plate. Accordingly, in other embodiments, it can also be set as an impregnated graphite plate or other elements with good conductivity, and the utility model does not impose specific restrictions on this. In addition, the number of assembled layers in this embodiment is 480 layers, and the size of all the support assemblies 130 after assembly is 200×200cm. After assembly, the height of the battery cell 100 is 240cm, and its capacity can reach 650Ah, and the rated voltage is 720V.

[0041] Specifically, the size of the energy storage container 200 in this embodiment is 12.2m×(length)×2.4m(width)×2.6m(height), so that 5 battery cells 100 can be stacked in this energy storage container 200, and the battery cells 100 are connected in parallel and match the PCS commonly used in the market. The total installed capacity inside this energy storage container 200 is: 650×5×720=2.34MWh. Conventional small batteries are used for installation. Combined with the space occupied by external wiring and support components 130, the installed capacity can be up to 1MWh. The use of this large-capacity and high-voltage aqueous sodium ion battery energy storage device can greatly increase the installed capacity of the energy storage container 200.

[0042] In summary, in the large-capacity and high-voltage aqueous sodium ion battery energy storage device described in the utility model, the aqueous sodium ion battery cell 110 and the current collecting assembly 120 are alternately arranged, and the supporting connection of the overall structure of the battery pack is realized by the supporting assembly 130, wherein the aqueous sodium ion battery cell 110 can fundamentally reduce the risk of thermal runaway, especially after multiple battery cells are assembled in series, it can also ensure safety and stability during use. At the same time, through the mutual cooperation between the current collecting assembly 120 and the supporting assembly 130, the battery pack can achieve good electrical conduction while having high strength, thereby further improving the use effect. Most importantly, the battery cell capacity in the present application matches the size of the supporting assembly, and the size of multiple battery cells matches the size of the energy storage container, thereby achieving large capacity and high voltage of the battery pack while making full use of the space. Compared with conventional battery packs at this stage, the present application has significant advantages such as stable structure, high safety in use, wide range of application, flexible adjustment and low production cost, and is a new type of large-capacity and high-voltage aqueous sodium ion battery energy storage device with broad application prospects.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A large-capacity, high-voltage aqueous sodium-ion battery energy storage device, characterized in that: It includes an energy storage container and a plurality of battery cells. The plurality of battery cells are assembled and filled in the energy storage container and match the size of the energy storage container. One of the battery cells includes: At least two aqueous sodium ion battery cells, at least two of which are arranged in the same direction; A plurality of current collecting components, wherein in the arrangement direction of the aqueous sodium ion battery cells, the plurality of current collecting components are respectively connected to opposite sides of all the aqueous sodium ion battery cells to achieve electrical conduction between two adjacent aqueous sodium ion battery cells; A plurality of support components, wherein the plurality of support components are respectively abutted between two adjacent current collecting components, and the support components and the two current collecting components abutted therewith jointly enclose a closed accommodation space, at least two aqueous sodium ion battery cells are respectively arranged inside the corresponding accommodation spaces, and the accommodation spaces are filled with electrolyte, wherein the internal capacity of any aqueous sodium ion battery cell is not less than 300Ah, and the accommodation space matches the size of the aqueous sodium ion battery cell.

2. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 1 is characterized in that: The aqueous sodium ion battery cell comprises a positive electrode sheet, a negative electrode sheet and a separator. In the arrangement direction of the aqueous sodium ion battery cell, the positive electrode sheet and the negative electrode sheet are respectively arranged on two opposite sides of the separator.

3. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 2 is characterized in that: The area of ​​the diaphragm is not less than that of the positive electrode sheet and / or the negative electrode sheet.

4. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 2 is characterized in that: The thickness of the positive electrode sheet and / or the negative electrode sheet is 1.0-4.0 mm, and the porosity of the positive electrode sheet and / or the negative electrode sheet is 40-60%.

5. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 1 is characterized in that: The support assembly is configured as an elastic frame structure arranged around the aqueous sodium ion battery cells in a direction perpendicular to the arrangement direction of the aqueous sodium ion battery cells.

6. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 1 is characterized in that: The current collecting assembly includes a conductive substrate and two conductive films. In the arrangement direction of the aqueous sodium ion battery cells, the two conductive films are respectively arranged on two opposite sides of the conductive substrate, and the supporting assembly is connected to the conductive films.

7. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 6 is characterized in that: The conductive film is provided with a waterproof structure.

8. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 6 is characterized in that: In a direction perpendicular to the arrangement direction of the aqueous sodium-ion battery cells, the area of ​​the accommodating space is S1, the area of ​​the conductive substrate is S2, and the area of ​​the conductive film is S3, wherein S1<S2<S3.

9. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 1 is characterized in that: A control component is provided inside the energy storage container, and at least one battery cell is connected to the control component.

10. The large-capacity and high-voltage aqueous sodium-ion battery energy storage device according to claim 9, characterized in that: The control components include a battery management system, a power distribution automation system and a battery pack detection system.

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