720V platform sodium salt battery pack

Abstract

The utility model discloses a 720V platform sodium salt battery pack, which comprises an inner box, an outer box, protection plates, insulating plates, a heating sheet and a battery pack, the inner box is arranged in the outer box, the battery pack is arranged in the inner box, a plurality of layers of protection plates are arranged between the inner box and the outer box, the insulating plates comprise first insulating plates, and the first insulating plates are laid on the outer wall of the battery pack; a plurality of groups of heating sheets are arranged at the top of the battery pack, and the battery pack is a 720V platform formed by connecting a plurality of single sodium salt batteries in series and arranging in an S shape; the outer box comprises a box body and an outer box cover, the box body comprises at least two bent edges, a plurality of lifting lugs and a plurality of supporting beams, the bent edges are located on the two sides of the top of the box body, the lifting lugs are located on the outer side walls of the box body, and the supporting beams are located at the bottom end of the box body. According to the utility model, a plurality of single sodium salt batteries are connected in series and are arranged in an S shape to form a 720V platform, so that the adaptability of the sodium salt battery pack is improved, and the requirement on the high-voltage sodium salt battery pack in the current environment is met; the outer box is provided with the supporting beams and the lifting lugs so that carrying can be facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery pack, in particular to a 720V platform sodium salt battery pack. BACKGROUND

[0002] Sodium salt battery adopts a full sealing structure in design, the material in the battery is relatively stable under high temperature, and there is no liquid sodium operation in the battery preparation process, which reduces the operation risk. Its positive material and electrolyte system also have good thermal stability and chemical stability, and are not easy to leak and self-ignite, etc. Safety accidents, it is a new type of battery with high safety, long service life, strong temperature resistance, low maintenance cost, good economy and wide application field. Among many energy storage technologies, electrochemical energy storage has great potential and is emerging in the field of energy storage. Compared with lithium ion batteries and lead-acid batteries, sodium salt batteries are more safe and reliable, have long cycle life, high specific energy and environmental friendliness, and are considered as a new type of energy storage technology suitable for new energy grid connection, distributed power generation and microgrid.

[0003] The development background of high-voltage sodium salt battery pack is mainly due to the demand for high-energy density and high-safety energy storage system. With the rapid development of renewable energy such as wind energy and solar energy, energy storage systems play an increasingly important role in balancing grid load and improving energy utilization. High-voltage sodium salt battery pack can effectively store large-scale renewable energy due to its high energy density and long service life, and meet the demand of grid energy storage, but at present, sodium salt battery pack is mainly medium voltage (48V-400V), which cannot meet the development of energy storage system. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies in the prior art, the utility model provides a 720V platform sodium salt battery pack,

[0005] The 720V platform composed of multiple single sodium salt battery groups is set, which meets the development needs of the energy storage system, and the outer box is provided with a support beam and a lifting lug to facilitate carrying.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a 720V platform sodium salt battery pack, comprising an inner box, an outer box, a protective plate, an insulating plate, a heating plate and a battery pack, wherein: the inner box is arranged inside the outer box, the battery pack is arranged inside the inner box, multiple layers of the protective plate are arranged between the inner box and the outer box, the insulating plate includes a first insulating plate, and the outer wall of the battery pack is paved with the first insulating plate; multiple groups of the heating plates are arranged on the top of the battery pack, and the battery pack is a 720V platform formed by multiple single sodium salt batteries connected in series and arranged in an S shape; the outer box includes a box body and an outer box cover, the box body includes at least two bent edges, multiple lifting ears and multiple support beams, the bent edges are located on both sides of the top of the box body, the lifting ears are located on the outer side walls of the box body, and the support beams are located at the bottom end of the box body.

[0007] The battery pack is a 720V platform formed by 280 single sodium salt batteries connected in series and arranged in an S shape, wherein the minimum cutoff protection voltage of each single sodium salt battery is 2.1V and the full-charge voltage is 2.67V; the rated voltage of the sodium salt battery pack is 722.4V.

[0008] The number of layers of the protection plates provided between the top of the inner box and the outer box is greater than the number of layers of the protection plates provided between the periphery and bottom of the inner box and the outer box.

[0009] Three layers of the protection plates are arranged between the top of the inner box and the outer box, and two layers of the protection plates are arranged between the four sides and the bottom of the inner box and the outer box.

[0010] Three groups of heating plates are set on the top of the battery pack, and the three groups of heating plates are located between the protective plate on the top of the inner box and the first insulating plate on the top of the battery pack; the total heating power of the three groups of heating plates is 1000W or 1500W, and the rated voltage of the three groups of heating plates is 745V.

[0011] The insulating plate further includes a second insulating plate, and the second insulating plate is arranged between adjacent single sodium salt batteries.

[0012] The battery pack further includes a connecting piece and a positive and negative bus bar, and the tops of the multiple single sodium salt batteries are connected by the connecting piece and the positive and negative bus bar.

[0013] The inner box, the outer box, the protection plate and the insulation plate are all provided with slots corresponding to the positions of the positive and negative bus bars; the positive and negative bus bars pass through the slots and extend to the outside of the outer box.

[0014] The notches on the outer box and the protective plate closest to the outer box are square in shape, and the remaining notches are U-shaped in shape.

[0015] The insulating plate adopts alumina fiber paper; and the connection between the multiple single sodium salt batteries is achieved by brazing.

[0016] From the above scheme, the advantages of the utility model are that:

[0017] The utility model discloses one aspect through setting up multiple groups of heating pieces on the top of battery pack, improves heating efficiency, on the other hand through multiple single sodium salt battery series and S shape arrangement form 720V platform, improves the adaptability of sodium salt battery package, satisfies the demand of high voltage sodium salt battery package under today's environment.

[0018] The utility model discloses setting up lifting lug and support beam on the box body of outer box, and the handling is carried out through two ways of hoisting and forklift fork conveying, overcomes the defect that the existing outer box cannot bear and is inconvenient to handle due to the heavy weight of high voltage sodium salt battery package.

[0019] The utility model discloses setting up heating piece on the top of battery pack, and corresponding multiple layers of protection plate are designed on the top, can reduce top heat loss while heat insulation.

[0020] The multiple layers of outer box, protection plate and inner box form progressive mechanical protection, and effectively disperse external impact force. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the exploded view of the whole structure of the utility model 720V platform sodium salt battery package;

[0022] Figure 2 It is the connection mode schematic view of single sodium salt battery in the battery pack of the utility model;

[0023] Figure 3 It is the outer box body structure diagram of the utility model 720V platform sodium salt battery package;

[0024] Figure 4 It is Figure 3 Partial enlarged view;

[0025] Figure 5 It is Figure 3 Enlarged view of area A in

[0026] Figure 6 It is the assembly process flow diagram of the utility model 720V platform sodium salt battery package;

[0027] Among them, the reference sign:

[0028] 1-720V platform sodium salt battery pack

[0029] 10-inner box

[0030] 11-outer box

[0031] 110-outer box cover

[0032] 1100-second opening

[0033] 111-box body

[0034] 1110-hanging lug

[0035] 1111-support beam

[0036] 1112-bent edge

[0037] 1113-outer side wall

[0038] 1114-long side

[0039] 1115-first opening

[0040] 12-protection plate

[0041] 12a-front protection plate

[0042] 12a0-first front protection plate

[0043] 12a1-second front protection plate

[0044] 12b-top protection plate

[0045] 13-insulation plate

[0046] 130-first insulation plate

[0047] 131-second insulation plate

[0048] 14-heating sheet

[0049] 15-battery pack

[0050] 150-single sodium salt battery

[0051] 151-connection sheet

[0052] 152-positive and negative bus bars

[0053] 16-slot

[0054] 160-first slot

[0055] 161-second slot DETAILED DESCRIPTION

[0056] The technical solutions of the utility model will be described in detail below in combination with the drawings and specific embodiments, so as to further understand the purpose, scheme and effect of the utility model, but not as a limitation on the protection scope of the claims of the utility model.

[0057] In the description, the references to "embodiment", "another embodiment", "the present embodiment" and the like mean that the described embodiment can include particular features, structures or characteristics, but not every embodiment must include these particular features, structures or characteristics. In addition, such expressions do not mean the same embodiment. Further, when a particular feature, structure or characteristic is described in combination with an embodiment, it is indicated that such feature, structure or characteristic is combined into other embodiments within the knowledge of those skilled in the art, whether or not it is explicitly described.

[0058] In the description and subsequent claims, certain words are used to refer to particular components or parts, and those skilled in the art should understand that the same component or part can be referred to by different names or terms by the user or manufacturer. The description and claims of the present specification do not distinguish components or parts by name, but by functional differences. Throughout the description and claims, "including" and "containing" are open terms, and should be interpreted as "including but not limited to". In addition, the term "connected" includes any direct and indirect electrical connection means. Indirect electrical connection means includes connection through other devices.

[0059] It should be noted that in the description of the utility model, the terms "front", "back", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship or parameters, etc. based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description content, and do not indicate or imply that the devices or elements referred to must have a particular orientation, a particular size or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0060] The existing sodium salt battery pack in the market does not have a 720V voltage platform, so the utility model is designed to meet the demand of the 720V platform sodium salt battery pack in the energy storage scene based on the application scenarios of grid energy storage and industrial and commercial energy storage.

[0061] Figure 1This is an exploded view of the overall structure of a 720V platform sodium salt battery pack 1 provided in one embodiment of the present invention. The 720V platform sodium salt battery pack 1 includes an inner box 10, an outer box 11, a multi-layer protective plate 12, an insulating plate 13, multiple sets of heating plates 14, and a battery pack 15. Among them: the inner box 10 is arranged inside the outer box 11, the battery pack 15 is arranged inside the inner box 10, and a multi-layer protective plate 12 is arranged between the inner box 10 and the outer box 11. The battery pack 15 is a 720V platform formed by multiple single sodium salt batteries 150 connected in series and arranged in an S shape. Multiple sets of heating plates 14 are arranged on the top of the battery pack 15. The insulating plate 13 includes a first insulating plate 130 and a second insulating plate 131 ( Figure 2 As shown in FIG, a first insulating plate 130 is laid on the outer wall of the battery pack 15 , and a second insulating plate 131 is set between adjacent single sodium salt batteries 150 .

[0062] Specifically, the voltage platform of the 720V platform sodium salt battery pack 1 is 720V, and the capacity is 40Ah. For example, 280 single sodium salt batteries 150 can be used in full series connection. The positive and negative poles of the single sodium salt battery 150 are arranged in an S shape. For specific connection methods, see Figure 2 Multiple sodium salt battery cells 150 are connected in series using brazing. The battery pack 15 in the 720V platform sodium salt battery pack 1 has a rated voltage of 722.4V and an operational voltage range of 588-747.6V. This means the minimum discharge cutoff voltage is 588V, and the fully charged voltage is 747.6V (for example, the minimum cutoff voltage for each sodium salt battery cell 150 is 2.1V, and the fully charged voltage is 2.67V). Because the sodium salt battery cells 150 should not be heated too quickly, internal heating employs three sets of heating plates 14 made of mica with internally fixed heating wires, which slowly heat the battery pack 15 from top to bottom. The total heating power of the three sets of heating plates 14 is 1000W, with a rated voltage of 745V, or the total heating power of the three sets of heating plates 14 is 1500W, with a rated voltage of 745V. In this embodiment, the number of heating plates 14 is three, but this is not a limitation.

[0063] The top heating layout adopts multiple groups of heating plates, 1-2 groups are used at a time, and the remaining group is used as a backup in case one group of heating wires breaks and fails. This greatly extends the service life of the heating plates and has a backup heater that can immediately take over the work in case of failure, avoiding interruptions that affect heating and ensuring stable heating operation.

[0064] Since the number of battery packs 15 in the 720V platform sodium salt battery pack 1 is greater than that in the medium voltage platform sodium salt battery pack, the weight is larger. Figures 3 to 5 As shown, the box body 111 of the outer box 11 of the present invention is provided with a plurality of lifting ears 1110 and a plurality of supporting beams 1111, which facilitates the use of two transport turnover methods to transport the entire 720V platform sodium salt battery pack 1.

[0065] Specifically, the first method involves installing two lifting lugs 1110 on each of the front and rear outer walls 1113 of the box 111. Preferably, the lifting lugs 1110 are located on the upper half of the outer arms 1113. These lugs 1110 are used in conjunction with a lifting hook (not shown) for lifting. The second method involves installing four support beams 1111 at the bottom of the box 111. A forklift is used to lift the box 111 from the bottom. The support beams 1111 prevent the bottom of the box 111 from collapsing and deforming due to the load, and also provide sufficient height clearance for the forklift's forks to reach in. In this embodiment, the number of both the lifting lugs 1110 and the support beams 1111 is four, but this is not a limitation.

[0066] In the first lifting method, to prevent the heavy weight of the battery pack from causing bulging on either side during lifting, the present invention provides a bent edge 1112 at the top of the long side 1114 of the box body 111. This bent edge 1112 also has multiple first openings 1115 for securing it to the outer box cover 110. Specifically, the bent edge 1112 is L-shaped, formed by extending and bending the top of the long side 1114. The first openings 1115 on the bent edge 1112 correspond to the second openings 1100 on the outer box cover 110, and are secured using fasteners (e.g., screws).

[0067] In this embodiment, the second insulating plate 131 between the single sodium salt battery cells 150 and the first insulating plate 130 between the battery pack 15 and the inner box 10 are both made of alumina fiber paper. While meeting the insulation performance requirements, the spacing inside the battery pack 15 is more compact, which can reduce space occupancy and weight.

[0068] In this embodiment, a multi-layer protective plate 12 is arranged between the inner box 10 and the outer box 11. Specifically, the protective plate 12 uses two layers on the four sides and the outside of the bottom of the inner box 10, and three layers on the top. This is because the heating plate 14 is located at the top. The three-layer top protective plate 12b can insulate and reduce heat loss at the top at the same time.

[0069] In this embodiment, the battery pack 15 further includes a connecting piece 151 and positive and negative bus bars 152. The tops of the multiple sodium salt battery cells 150 are connected by the connecting piece 151 and the positive and negative bus bars 152. Notches 16 are defined in the inner box 10, outer box 11, protective plate 12, and insulating plate 13 at locations corresponding to the positive and negative bus bars 152. The positive and negative bus bars 152 extend through the notches 16 and out of the outer box 11.

[0070] Conventional medium and low voltage battery packs are generally connected to the battery management system (BMS) using flexible cables. The connection between the 720V platform high voltage sodium salt battery pack 1 and the battery management system is in the form of a bus (such as the positive and negative bus 152). The bus has a large cross-sectional area and low resistance, which can carry a larger current. In addition, due to the increased surface area, it dissipates heat better than a cable of the same length.

[0071] In this embodiment, the protective plate 12 includes a front protective plate 12a, further comprising a first front protective plate 12a0 and a second front protective plate 12a1. The slots 16 include a first slot 160 and a second slot 161. The first slot 160 on the outer box 11 and the protective plate 12 closest to the outer box 11 (e.g., the first front protective plate 12a0) is square in shape. The remaining slots 16 (including the corresponding slots 16 on the inner box 10 and the insulating plate 13, such as the second slot 161) are U-shaped. The square first slot 160 near the outer box 11 mates closely with the first front protective plate 12a0, providing rigid support. The inner U-shaped second slot 161 allows for flexible deformation of the positive and negative busbars 152 within a certain range, alleviating vibration stress and reducing the risk of breakage. Furthermore, the outer square first notch 160 matches the cross-section of the positive and negative busbars 152, limiting lateral displacement and preventing misalignment due to jolts. The inner U-shaped second notch 161 provides longitudinal expansion margin, absorbing deformation caused by thermal expansion and contraction or mechanical vibration, and preventing stress concentration. In this embodiment, the inner edge of the U-shaped second notch 161 is a right-angled design, but it can also be replaced with a rounded design to reduce wear on the positive and negative busbars 152.

[0072] In summary, the outer box 11 serves as the structural frame of the 720V platform sodium salt battery pack 1 and is externally connected to a battery management system (BMS); the insulating plate 13 isolates and insulates between the single sodium salt batteries 150 and the single sodium salt batteries 150, or between the battery pack 15 and the inner box 10, to prevent the single sodium salt batteries 150 from short-circuiting with each other and the inner box 10 from being charged; the heating plate 14 heats and raises the temperature to the normal operating temperature range of the single sodium salt batteries 150 to activate the battery performance; the single sodium salt batteries 150 are the basic functional units of the battery pack 15, and are connected in series to form the battery pack 15. In this embodiment, all the single sodium salt batteries 150 are connected in series, and can also be connected in parallel in other embodiments; the positive and negative bus bars 152 are the total positive / negative output terminals of the battery pack 15, which are respectively connected to the positive / negative poles of the battery pack 15; the inner box 10 is also the structural frame of the 720V platform sodium salt battery pack 1, which constrains the arrangement of the single sodium salt batteries 150.

[0073] The 720V platform sodium salt battery pack 1 is assembled from the outside to the inside, that is, the protective plate 12 is first installed in the outer box 11, and then the inner box 10 is placed. Then, the battery pack 15 and the insulating plate 13 are assembled on the inner box 10, the connecting piece 151 is welded, and finally the outer box cover 110 is covered to seal the box. The process flow is shown in FIG. Figure 6 , specifically comprising the following steps: S100, the upper line of the outer box 11; S101, the assembly of the bottom and the four around protection plates 12 and the inner box 10; S102, the assembly of the insulation plate 13; S103, the detection assembly of the single sodium salt battery 150; S104, the assembly and welding of the connecting sheet 151; S105, the assembly of the positive and negative busbars 152, i.e. the assembly of the wire harness processing; S106, the assembly of the heating sheet 14 and the top protection plate 12b; S107, the assembly of the outer box cover 110; S108, the lower line.

[0074] In other embodiments, different voltage specifications and models of single sodium salt batteries can be used, such as other models and sizes of single sodium salt batteries with higher voltage and capacity; different numbers of single sodium salt batteries can be used in series to reach a 720V platform; different materials and thicknesses of insulation plates can be used; thermocouples / RTDs can be used for temperature collection, such as replacing the connection of thermocouples and BMS (Battery Management System) with RTDs (thermistors); different materials and thicknesses of protection plates can be used; wire harnesses can be used instead of busbars to connect the total positive and negative electrodes; and the like.

[0075] In summary, the utility model discloses a plurality of heating sheets are arranged on the top of the battery pack, and the heating efficiency is improved; a plurality of single sodium salt batteries are connected in series and arranged in an S shape to form a 720V platform, and the adaptability of the sodium salt battery pack is improved to meet the demand for high-voltage sodium salt battery packs in today's environment; the heating sheet is arranged on the top of the battery pack, and the plurality of protection plates designed on the top correspond to reduce the heat loss on the top while insulating; the multilayer structure of the outer box, the protection plate and the inner box forms progressive mechanical protection, effectively disperses external impact force, and the square notch close to the outer box is tightly matched with the protection plate to provide rigid support; the internal U-shaped notch allows the positive and negative busbars to flexibly deform within a certain range, relieves vibration stress and reduces the risk of fracture.

[0076] The embodiments of the utility model are described above in combination with the drawings, but the utility model is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative but not restrictive, and the person skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, which all belong to the protection scope of the utility model.

Claims

1. A 720V platform sodium salt battery pack, characterized in that: It includes an inner box, an outer box, a protective plate, an insulating plate, a heating plate and a battery pack, wherein: The inner box is arranged inside the outer box, the battery pack is arranged inside the inner box, multiple layers of the protective plates are arranged between the inner box and the outer box, the insulating plates include a first insulating plate, and the outer wall of the battery pack is paved with the first insulating plate; Multiple groups of heating plates are arranged on the top of the battery pack, and the battery pack is a 720V platform formed by multiple single sodium salt batteries connected in series and arranged in an S shape; The outer box includes a box body and an outer box cover. The box body includes at least two bent edges, multiple ears and multiple support beams. The bent edges are located on both sides of the top of the box body, the ears are located on the outer side walls of the box body, and the support beams are located at the bottom end of the box body.

2. The 720V platform sodium salt battery pack according to claim 1, characterized in that: The battery pack is a 720V platform formed by 280 single sodium salt batteries connected in series and arranged in an S shape, wherein the minimum cutoff protection voltage of each single sodium salt battery is 2.1V and the full-charge voltage is 2.67V; the rated voltage of the sodium salt battery pack is 722.4V.

3. The 720V platform sodium salt battery pack according to claim 1, characterized in that: The number of layers of the protection plates provided between the top of the inner box and the outer box is greater than the number of layers of the protection plates provided between the periphery and bottom of the inner box and the outer box.

4. The 720V platform sodium salt battery pack according to claim 1, characterized in that: Three layers of the protection plates are arranged between the top of the inner box and the outer box, and two layers of the protection plates are arranged between the four sides and the bottom of the inner box and the outer box.

5. The 720V platform sodium salt battery pack according to claim 1, characterized in that: Three groups of heating plates are set on the top of the battery pack, and the three groups of heating plates are located between the protective plate on the top of the inner box and the first insulating plate on the top of the battery pack; the total heating power of the three groups of heating plates is 1000W or 1500W, and the rated voltage of the three groups of heating plates is 745V.

6. The 720V platform sodium salt battery pack according to claim 1, characterized in that: The insulating plate further includes a second insulating plate, and the second insulating plate is arranged between adjacent single sodium salt batteries.

7. The 720V platform sodium salt battery pack according to claim 1, characterized in that: The battery pack further includes a connecting piece and a positive and negative bus bar, and the tops of the multiple single sodium salt batteries are connected by the connecting piece and the positive and negative bus bar.

8. The 720V platform sodium salt battery pack according to claim 7, characterized in that: The inner box, the outer box, the protection plate and the insulation plate are all provided with slots at positions corresponding to the positive and negative bus bars; the positive and negative bus bars pass through the slots and extend to the outside of the outer box.

9. The 720V platform sodium salt battery pack according to claim 8, characterized in that: The notches on the outer box and the protective plate closest to the outer box are square in shape, and the remaining notches are U-shaped in shape.

10. The 720V platform sodium salt battery pack according to claim 1, characterized in that: The insulating plate is made of alumina fiber paper; the multiple single sodium salt batteries are connected by brazing.

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