Sodium-ion battery positive electrode material and sodium-ion battery

Abstract

The invention discloses a sodium-ion battery positive electrode material and a sodium-ion battery, the sodium-ion battery comprises an outer shell, a connecting sheet, a sodium-ion battery module, a fixing plate and a battery control system, and the sodium-ion battery also comprises an electrolyte leakage maintenance mechanism, a cleaning mechanism and an oxygen uptake mechanism, the electrolyte leakage maintenance mechanism is located on the end face of the upper side of the sodium ion battery module, the electrolyte leakage maintenance mechanism comprises a preliminary maintenance mechanism and a later maintenance mechanism, and the later maintenance mechanism comprises a cleaning assembly and a recovery treatment assembly. When electrolyte leakage occurs between the battery and the upper cover by adopting the electrolyte leakage maintenance mechanism, temporary treatment can be carried out, risks caused by electrolyte leakage are reduced, the use safety of the battery is improved, the service life of the battery is prolonged, and when pollutants enter between the battery and the upper cover, the pollutants can be cleaned through the cleaning mechanism.

Description

Technical Field

[0001] The present invention belongs to the technical field of sodium-ion batteries, and particularly relates to a cathode material for a sodium-ion battery and a sodium-ion battery. Background Art

[0002] A sodium-ion battery is a secondary battery that relies on the movement of sodium ions between the positive and negative electrodes to complete charge and discharge. Its working principle is similar to that of a lithium-ion battery and is called a "rocking chair" battery. The main components of a sodium-ion battery include a positive electrode, a negative electrode, a separator, an electrolyte, and a current collector. The structure and performance of the positive and negative electrode materials determine the sodium storage performance of the entire battery. During charging, sodium ions are removed from the positive electrode, pass through the electrolyte, and are embedded in the negative electrode through the separator; during discharging, on the contrary, sodium ions are removed from the negative electrode and re-embedded in the positive electrode material. Sodium-ion batteries exhibit many advantages. Sodium-ion batteries have a wide range of applications and are mostly used in the fields of household energy storage, industrial and commercial energy storage, and backup power supplies for communication base stations.

[0003] However, when a sodium-ion battery is used to build an energy storage station in an area with frequent sandstorms, the following problems are likely to occur; The contact surface between the sodium-ion battery and the upper cover may be corroded due to electrolyte leakage.

[0004] In areas with strong sandstorms, such as desert areas, when building an energy storage station, due to long-term use or processing errors, the seal between the battery in the energy storage station and the upper cover is poor, and the staff cannot discover and maintain it in time, which is likely to cause external pollutants to enter the battery interior, such as debris and sandstorms entering the interior, which may pierce the separator or connect the positive and negative electrodes, causing micro-short circuit or direct short circuit, or moisture in the air enters the interior and reacts with the electrolyte, accelerating the decomposition of the electrolyte and resulting in capacity attenuation.

[0005] During the use of sodium-ion batteries, oxygen is likely to be generated under high temperature, overcharge, and cyclic aging conditions. However, the release of oxygen may cause electrolyte decomposition and thermal runaway, shortening the service life of the battery and many other adverse reactions. Therefore, in view of the above technical problems, it is necessary to provide a cathode material for a sodium-ion battery and a sodium-ion battery.

[0006] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a cathode material for a sodium-ion battery and a sodium-ion battery, which can solve the problems raised in the background art.

[0008] To achieve the above object, the technical solution provided by a specific embodiment of the present invention is as follows: A sodium-ion battery includes a housing, a connecting piece, a sodium-ion battery module, a fixing plate, and a battery control system. The sodium-ion battery further includes an electrolyte leakage maintenance mechanism, a cleaning mechanism, and an oxygen absorption mechanism. The electrolyte leakage maintenance mechanism is located on the upper end face of the sodium-ion battery module. The electrolyte leakage maintenance mechanism includes a preliminary maintenance mechanism and a subsequent maintenance mechanism. The subsequent maintenance mechanism includes a cleaning component and a recycling and treatment component. The cleaning component matches the upper end face of the sodium-ion battery module. The cleaning component includes a first adsorption and cleaning column and a second adsorption and cleaning column. First adsorption holes are provided on the central end faces of the first adsorption and cleaning column and the second adsorption and cleaning column. The preliminary maintenance mechanism preliminarily adsorbs the leaked electrolyte. The preliminary maintenance mechanism and the subsequent maintenance mechanism slide on the inner wall end face of the housing; the cleaning mechanism is located on the top end face of the sodium-ion battery module. The cleaning mechanism matches multiple parts on the upper end face of the sodium-ion battery module; the oxygen absorption mechanism is located on the inner wall end face of the housing. The oxygen absorption mechanism includes a gas treatment component and a storage component. The gas treatment component includes gas adsorption holes, and the gas adsorption holes adsorb the leaked gas.

[0009] In one or more embodiments of the present invention, the preliminary maintenance mechanism includes a mobile spraying and maintenance mechanism. The mobile spraying and maintenance mechanism includes a mobile spraying seat. A plurality of adsorption ball nozzles are fixedly connected to the bottom end face of the mobile spraying seat. The adsorption ball nozzles are connected to a preliminary maintenance supply box. The preliminary maintenance supply box is installed on the inner wall end face of the first maintenance box. A plurality of electrolyte adsorption balls are stored in the preliminary maintenance supply box. An explosion layer and a fire extinguishing layer are sequentially arranged inside the electrolyte adsorption ball. The electrolyte adsorption ball and the second adsorption and cleaning column are made of one or a mixture of cellulose, polystyrene, and activated carbon. The explosion layer is a mixture of multiple of magnesium powder, potassium nitrate, epoxy resin, phenolic resin, carbonate, phosphate, silicate, and silicon dioxide. The fire extinguishing layer is perfluoromethyl hexanone.

[0010] In one or more embodiments of the present invention, the storage component includes a total gas storage box and a total waste gas storage box. An exhaust gas storage box is arranged on the bottom end face of the second maintenance box. A waste residue storage box, an exhaust gas storage box, and a neutralization powder storage box are arranged inside the total waste gas storage box. A plurality of gas storage boxes and a neutralization gas storage box are arranged inside the total gas storage box; a plurality of gas storage boxes and a neutralization gas storage box are arranged inside the gas storage box; the gas treatment component further includes a second air pump and a gas detector. A plurality of gas adsorption holes are arranged on one side end face of the first maintenance box and the second maintenance box. The second air pump is connected to the gas adsorption holes. The gas adsorption holes are respectively connected to a gas storage box and a neutralization gas storage box. Carbon monoxide is stored in the neutralization gas storage box.

[0011] In one or more embodiments of the present invention, the preliminary maintenance mechanism includes an ultrasonic leak detector, a preliminary adsorption mechanism, a sealed storage mechanism, a first maintenance box, and a second maintenance box. The preliminary adsorption mechanism includes an adsorption pad roll and a recovery roll. The adsorption pad roll is installed on the inner wall end face of the first maintenance box, and an adsorption pad is wound on the adsorption pad roll. A fastening rope is connected between the adsorption pad and the recovery roll. The recovery roll is installed on the inner wall end face of the second maintenance box. An automatic retractable door is fixedly connected to the upper side end face of the second maintenance box where the recovery roll is located, and a cutter is installed on one side end face of the automatic retractable door.

[0012] In one or more embodiments of the present invention, the adsorption pad includes an adsorption upper pad, and a plurality of adsorption columns are adhesively bonded to the bottom end face of the adsorption upper pad.

[0013] In one or more embodiments of the present invention, the cleaning mechanism includes a control base. The bottom end face of the control base is movably connected to a bottom plate. The bottom end face of the bottom plate is fixedly connected with a first cleaning brush and a second cleaning brush that match the surfaces of the sodium ion battery module, the connecting piece, and the fixing plate. The first cleaning brush and the second cleaning brush are fixedly connected.

[0014] In one or more embodiments of the present invention, the recovery and treatment assembly further includes a hydrogen fluoride gas detector, a second nozzle, and a strengthened adsorption column. The hydrogen fluoride gas detector is installed on one side end face of the sealed storage mechanism. A plurality of cutting blades are fixedly connected to the top end face of the strengthened adsorption column. Both the strengthened adsorption column and the second adsorption and cleaning column are connected to a first air pump. One side end face of the first air pump is connected to a waste residue storage box. One side end face of the second nozzle is connected to a neutralizing powder storage box. A plurality of hot air delivery holes are opened on the second nozzle, and the plurality of hot air delivery holes are connected to a hot air blower. The neutralizing powder storage box stores dry lime powder or calcium carbonate.

[0015] In one or more embodiments of the present invention, the bottom end face of the bottom plate is fixedly connected with an adsorption brush plate that matches the two side end faces of the connecting piece. Adsorption brush strips are adhesively bonded to the adsorption brush plate. A plurality of first spray holes and second adsorption holes are provided on both the adsorption brush strips and the adsorption brush plate. A second cleaning brush is fixedly connected between a pair of the adsorption brush strips on the bottom plate. A plurality of first adsorption and cleaning columns and first spraying columns are provided on the middle end face of the second cleaning brush. The first spray holes and the first spraying columns are both connected to the neutralizing powder storage box. The first adsorption and cleaning columns and the second adsorption holes are both connected to the first air pump.

[0016] In one or more embodiments of the present invention, a storage mechanism is provided on one end face of the outer casing of the sodium-ion battery module. The storage mechanism includes a waste residue storage box and a matching box. The bottom end face of the matching box is fixedly connected to the waste residue storage box, and a slag guiding groove is formed on the waste residue storage box.

[0017] A sodium-ion battery cathode material, the sodium-ion battery cathode material includes a metal oxide, and one or more of magnesium ions, aluminum ions, titanium ions, fluoride ions, and sulfide ions are doped in the metal oxide. The outer end face of the metal oxide is sequentially wrapped with and carbon nanofibers.

[0018] Compared with the prior art, a sodium-ion battery cathode material and a sodium-ion battery of the present invention have the following advantages; When electrolyte leakage occurs between the battery and the upper cover, the electrolyte leakage maintenance mechanism can be used for temporary treatment, reducing the risk caused by electrolyte leakage, improving the use safety of the battery, and extending the service life of the battery.

[0019] When contaminants enter between the battery and the upper cover, the cleaning mechanism can be used to clean them, preventing the battery from short-circuiting or accelerating the decomposition of the electrolyte due to the entry of air and moisture into the interior.

[0020] The oxygen absorption mechanism is used to timely adsorb the leaked oxygen inside the battery, preventing the battery from electrolyte decomposition and thermal runaway when oxygen leaks, and enhancing the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the sodium-ion battery in Embodiment 1 of the present invention; Figure 2 It is a schematic diagram of the first use state of the sodium-ion battery in Embodiment 1 of the present invention; Figure 3 It is a schematic diagram of the second use state of the sodium-ion battery in Embodiment 1 of the present invention; Figure 4 It is a schematic structural diagram of the electrolyte leakage maintenance mechanism in Embodiment 1 of the present invention; Figure 5 For Figure 4 Schematic diagram of the structure at A of Figure 6 is Figure 4 a schematic structural diagram of the structure at position B; Figure 7 is a cross-sectional view of the sodium-ion battery in the first embodiment of the present invention; Figure 8 is Figure 7 a schematic structural diagram of the structure at position C; Figure 9 is a schematic structural diagram of the material storage mechanism in the first embodiment of the present invention; Figure 10 is a schematic structural diagram of the adsorption pad in the first embodiment of the present invention; Figure 11 is a schematic structural diagram of the sodium-ion battery in the second embodiment of the present invention; Figure 12 is Figure 11 a schematic structural diagram of the structure at position D; Figure 13 is a schematic structural diagram of the electrolyte adsorption ball in the second embodiment of the present invention.

[0023] Main reference numeral description: 1 - outer housing, 2 - upper cover, 3 - connecting piece, 4 - sodium-ion battery module, 5 - fixing plate, 6 - electrolyte leakage maintenance mechanism, 601 - control base, 602 - bottom plate, 603 - first cleaning brush, 604 - adsorption brush strip, 605 - first spray hole, 606 - second cleaning brush, 6061 - first spraying column, 6062 - first adsorption cleaning column, 607 - second spray head, 6071 - hot air delivery hole, 608 - enhanced adsorption column, 6081 - cutting blade, 609 - second adsorption cleaning column, 610 - adsorption brush plate, 611 - second adsorption hole, 7 - preliminary maintenance mechanism, 701 - first maintenance box, 702 - total gas storage box, 8 - sealed storage mechanism, 801 - second maintenance box, 802 - total waste gas storage box, 9 - material storage mechanism, 901 - waste residue storage box, 902 - matching box, 903 - slag guiding groove, 10 - preliminary adsorption mechanism, 1001 - adsorption pad roll, 1002 - adsorption pad, 10021 - adsorption upper pad, 10022 - adsorption column, 1003 - recovery roll, 11 - mobile spraying maintenance mechanism, 1101 - mobile spraying seat, 1102 - adsorption ball spray head, 12 - slide rail, 13 - first chute, 14 - battery control system, 15 - electrolyte adsorption ball, 16 - bursting layer, 17 - fire extinguishing layer, 18 - gas adsorption hole, 19 - automatic retractable door, 1901 - cutter. Detailed implementation manners

[0024] To enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1, as Figures 1-10 shown, a cathode material for a sodium-ion battery and a sodium-ion battery in an embodiment of the present invention, a sodium-ion battery, includes a housing 1, a connecting piece 3, a sodium-ion battery module 4, a fixing plate 5, and a battery control system 14. A sodium-ion battery further includes an electrolyte leakage maintenance mechanism 6, a cleaning mechanism, an oxygen absorption mechanism, and a storage mechanism 9.

[0026] The cleaning mechanism is located at the top end face of the sodium-ion battery module 4. The cleaning mechanism matches multiple parts on the upper side end face of the sodium-ion battery module 4. The pollutants entering between the upper cover 2 and the sodium-ion battery module 4 are cleaned through the cleaning mechanism to prevent the battery from short-circuiting or accelerating the decomposition of the electrolyte due to the entry of air moisture into the interior. Hot air is conveyed through the hot air delivery hole 6071 to dry the moisture and prevent the situation where the entry of moisture into the interior accelerates the decomposition of the electrolyte.

[0027] Further, the cleaning mechanism includes a control base 601. The bottom end face of the control base 601 is movably connected to a bottom plate 602, which is convenient for disassembling and fixing the bottom plate 602. The connection between the control base 601 and the bottom plate 602 is one or a combination of snap connection, magnetic attraction connection, and bolt connection.

[0028] As Figures 4-6 shown, the bottom end face of the bottom plate 602 is fixedly connected with a first cleaning brush 603 and a second cleaning brush 606 that match the surfaces of the sodium-ion battery module 4, the connecting piece 3, and the fixing plate 5. The first cleaning brush 603 and the second cleaning brush 606 are fixedly connected. The first cleaning brush 603 and the second cleaning brush 606 move on the sodium-ion battery module 4 to sweep the pollutants accumulated above the sodium-ion battery module 4 into the slag guiding groove 903 for storage.

[0029] Further, a cylinderless cylinder is fixedly connected to one side end face of the control base 601. The cylinderless cylinder drives the control base 601 to slide back and forth. The cylinderless cylinder is located at the inner wall end face of the first maintenance box 701. Slide rails 12 are provided on one side end faces of the first maintenance box 701 and the second maintenance box 801. A pair of opposite end faces of the control base 601 are slidably connected to the slide rails 12, and the control base 601 is driven by the cylinderless cylinder to slide on the upper side end face of the sodium-ion battery module 4 to clean the pollutants.

[0030] The electrolyte leakage maintenance mechanism 6 is located on the upper end face of the sodium-ion battery module 4. The electrolyte leakage maintenance mechanism 6 includes a preliminary maintenance mechanism 7 and a post-maintenance mechanism. When electrolyte leakage occurs between the sodium-ion battery module 4 and the outer housing 1, after preliminary treatment by the preliminary maintenance mechanism 7, it is then intensively cleaned by the post-maintenance mechanism to reduce the risks caused by electrolyte leakage and improve the safety of battery use.

[0031] As Figures 1-10 shown, the preliminary maintenance mechanism 7 includes an ultrasonic leak detector, a preliminary adsorption mechanism 10, a sealed storage mechanism 8, a first maintenance box 701, and a second maintenance box 801. The ultrasonic leak detector is installed on one end face of the inner wall of the outer housing 1. The preliminary adsorption mechanism 10 includes an adsorption pad reel 1001 and a recovery reel 1003. The first maintenance box 701 and the second maintenance box 801 are both provided with a first sliding groove 13, and the adsorption pad 1002 passes through the first sliding groove 13.

[0032] The adsorption pad reel 1001 is installed on the inner wall end face of the first maintenance box 701. The adsorption pad 1002 is wound around the adsorption pad reel 1001. A fastening rope is connected between the adsorption pad 1002 and the recovery reel 1003. The recovery reel 1003 is installed on the inner wall end face of the second maintenance box 801.

[0033] A self-retracting door 19 is fixedly connected to the upper end face of the second maintenance box 801 where the recovery reel 1003 is located. A cutter 1901 is installed on one end face of the self-retracting door 19. The self-retracting door 19 can automatically close and open the space inside the second maintenance box 801 where the recovery reel 1003 is stored.

[0034] Specifically, when electrolyte leakage occurs between the sodium-ion battery module 4 and the outer housing 1, the ultrasonic leak detector gives an early warning, and the adsorption pad reel 1001 and the recovery reel 1003 are activated. The recovery reel 1003 drives the fastening rope to rotate, thereby driving the adsorption pad 1002 to move forward until it completely covers the upper end face of the sodium-ion battery module 4. The adsorption pad 1002 abuts against the connecting piece 3, the sodium-ion battery module 4, and the top end face of the fixing plate 5 to adsorb the leaked electrolyte.

[0035] The adsorption pad 1002 includes an upper adsorption pad 10021. A plurality of adsorption columns 10022 are adhesively bonded to the bottom end face of the upper adsorption pad 10021. Depending on their own flexibility, the adsorption columns 10022 perform conforming cleaning coverage on the connecting piece 3, the sodium-ion battery module 4, and the top end face of the fixing plate 5, and perform preliminary adsorption on the electrolyte. After the adsorption is completed, the recovery roller 1003 rotates to drive the adsorption pad 1002 to rotate. After the adsorption pad 1002 adsorbed with the electrolyte is completely wound around the recovery roller 1003, the automatic retractable door 19 is activated and extends forward to drive the cutter 1901 to move and cut the adsorption pad 1002, disconnecting the adsorption pad 1002. At this time, one side end face of the automatic retractable door 19 completely abuts against the inner wall end face of the second maintenance box 801, sealing the space of the recovery roller 1003 storing the second maintenance box 801 at this time, enhancing the sealing performance and preventing pollutant leakage. When the staff performs later maintenance, it can be opened from the rear cover of the first maintenance box 701, the recovery roller 1003 is taken out and replaced with a new one. After replacement, the fastening rope between the adsorption pad roller 1001 and the recovery roller 1003 is connected and can be used again.

[0036] It should be noted that the adsorption columns 10022, the first adsorption and cleaning column 6062, and the second adsorption and cleaning column 609 are made of a mixture of graphene and cellulose. Cellulose is a natural polymer organic compound widely present in the plant cell wall, which can increase the physical strength and chemical stability of the adsorption cotton and improve its specific surface area, thereby enhancing the adsorption performance. Graphene can further enhance its adsorption capacity and stability. When graphene contacts the electrolyte, its high specific surface area enables more electrolyte molecules to be adsorbed on the graphene surface. At the same time, the excellent electrical conductivity of graphene contributes to the rapid transfer of electrons between the electrolyte and the electrode. These interactions jointly promote the diffusion of the electrolyte on the graphene surface. The later maintenance mechanism includes a cleaning component and a recovery and treatment component. The cleaning component is matched with the upper side end face of the sodium-ion battery module 4. The cleaning component includes a first adsorption and cleaning column 6062 and a second adsorption and cleaning column 609. First adsorption holes are provided on the central end faces of the first adsorption and cleaning column 6062 and the second adsorption and cleaning column 609. The preliminary maintenance mechanism 7 performs preliminary adsorption on the leaked electrolyte. The preliminary maintenance mechanism 7 and the later maintenance mechanism slide on the inner wall end face of the outer housing 1. The outer side end faces of the first adsorption and cleaning column 6062 and the second adsorption and cleaning column 609 are made of flexible materials, and the first adsorption and cleaning column 6062 and the second adsorption and cleaning column 609 can perform cleaning and adsorption of the leaked electrolyte on the upper side end face of the sodium-ion battery module 4.

[0037] The recycling and processing component also includes a hydrogen fluoride gas detector, a second nozzle 607 and an enhanced adsorption column 608. The hydrogen fluoride gas detector is installed on one side end face of the sealed storage mechanism 8. One side end face of the second nozzle 607 is connected to a neutralization powder storage box. Dry lime powder or calcium carbonate is stored in the neutralization powder storage box.

[0038] It should be noted that the electrolyte contains NaPF6 and leaks and encounters water, for example, in a humid environment, water enters between the sodium ion battery module 4 and the upper cover 2, and a trace amount of HF may be generated, which is harmful to the surrounding environment and human health. At this time, the generated HF needs to be processed again. Spraying dry lime powder or calcium carbonate through the second nozzle 607 can react with HF to neutralize HF to generate calcium fluoride precipitation, and the reaction formula involved is as follows;

[0039] After the calcium fluoride precipitate is generated, the calcium fluoride needs to be processed for a second time. The top end surface of the adsorption column 608 is strengthened to be fixedly connected with a plurality of cutting blades 6081. The adsorbed large pieces of calcium fluoride are cut by the cutting blades 6081 to facilitate subsequent adsorption.

[0040] The bottom plate 602 is located between a pair of adsorption brush strips 604 and is fixedly connected to a second cleaning brush 606. A plurality of first adsorption cleaning columns 6062 and a first spray column 6061 are arranged on the middle end surface of the second cleaning brush 606. The enhanced adsorption column 608, the second adsorption cleaning column 609, the second adsorption hole 611 and the first adsorption cleaning column 6062 are all connected to the first air pump. The first air pump is connected to the gas delivery main pipe, the gas delivery main pipe is connected to the gas delivery branch pipe, and the gas delivery branch pipe is respectively connected to the enhanced adsorption column 608, the second adsorption cleaning column 609, the second adsorption hole 611 and the first adsorption cleaning column 6062. The hole 611, the second adsorption cleaning column 609 and the first adsorption cleaning column 6062 are used to convey negative pressure, and a pair of opposite end faces of the waste slag storage box are respectively connected to the gas delivery main pipe, and the waste slag is adsorbed and then transported to the waste slag storage box for storage. The negative pressure is generated by the first air pump and transported to the enhanced adsorption column 608, the second adsorption hole 611, the second adsorption cleaning column 609 and the first adsorption cleaning column 6062 to adsorb the calcium carbonate located on the top end face of the sodium ion battery module 4 and then transported to the waste slag storage box for storage.

[0041] Of course, in order to prevent moisture from entering between the upper cover 2 and the outer casing 1 when generating HF, it is necessary to evaporate the moisture. A plurality of hot air delivery holes 6071 are provided on the second nozzle 607. The plurality of hot air delivery holes 6071 are connected to a hot air blower through a first delivery pipe. A humidity sensor is provided on the inner wall end face of the outer casing 1. When the humidity sensor detects that the air contains moisture, the hot air delivery holes 6071 are activated to deliver hot air to dry the moisture, preventing the generation of HF and the intrusion of water into the battery interior. At the same time, when moisture enters due to poor sealing between the outer casing 1 and the upper cover 2, hot air is delivered through the hot air delivery holes 6071 to dry the moisture.

[0042] An adsorption brush plate 610 that is fixedly connected to the bottom end face of the bottom plate 602 and matches the two side end faces of the connecting piece 3 is provided. Adsorption brush strips 604 are adhered to the adsorption brush plate 610. A plurality of first spray holes 605 and second adsorption holes 611 are provided on both the adsorption brush strips 604 and the adsorption brush plate 610. The second nozzle 607, the first spray holes 605, and the first spraying column 6061 are all connected to a neutralizing powder storage box. Dry lime powder or calcium carbonate is sprayed through the second nozzle 607, the first spray holes 605, and the first spraying column 6061 to neutralize the leaked HF.

[0043] Specifically, the plurality of adsorption brush strips 604, the second cleaning brush 606, and the adsorption brush plate 610 fixedly connected to the bottom plate 602 match the gaps between the plurality of connecting pieces 3 and the sodium-ion battery module 4 and the top end face of the connecting piece 3. When the electrolyte leaks, the electrolyte is most likely to appear between the sodium-ion battery module 4 and the connecting piece 3. At this time, the adsorption brush strips 604 can well fit the gaps between the sodium-ion battery module 4 and the connecting piece 3 and wipe them back and forth. At the same time, the adsorption brush strips 604 and the adsorption brush plate 610 will not affect the connection between the sodium-ion battery module 4 and the connecting piece 3.

[0044] Jetting mechanisms are connected between the second nozzle 607, the first spray holes 605, and the first spraying column 6061 and the neutralizing powder storage box respectively. Through the jetting mechanisms, the dry lime powder or calcium carbonate stored in the neutralizing powder storage box is ejected.

[0045] The oxygen absorption mechanism is located on the inner wall end face of the outer casing 1. The oxygen absorption mechanism includes a gas treatment component and a storage component. The gas treatment component includes gas adsorption holes 18, and the gas adsorption holes 18 adsorb the leaked gas. The gas treatment component further includes a second air pump and a gas detector. A plurality of gas adsorption holes 18 are provided on one side end face of each of the first maintenance box 701 and the second maintenance box 801. The second air pump is connected to the gas adsorption holes 18. The gas adsorption holes 18 are respectively connected to a gas storage box and a neutralizing gas storage box, and carbon monoxide is stored in the neutralizing gas storage box.

[0046] Specifically, when a sodium-ion battery undergoes thermal runaway, the temperature inside the battery rises sharply, causing the electrolyte to decompose. The decomposition of the electrolyte produces various gases, including hydrogen, carbon dioxide, and ethylene. The generation of these gases is due to the chemical components in the electrolyte reacting at high temperatures and releasing gases, posing a great threat to the safety of the battery. When the gas detector monitors that the inside of the battery is out of control and there are multiple gas leaks, the second air pump is activated to convey negative pressure through the second delivery pipe into the gas adsorption holes 18 to adsorb the gases in the air, and the gases are conveyed through the third delivery pipe to the gas storage box for storage.

[0047] Preferably, an optical oxygen sensor is installed on one end face outside the preliminary maintenance mechanism 7. When the battery leaks oxygen alone during a long-term operation, the optical oxygen sensor monitors the oxygen leakage and activates the neutralizing gas storage box to convey carbon monoxide into the multiple gas adsorption holes 18 through the fourth delivery pipe to react with the oxygen in the air to generate carbon dioxide, which can cool the inside of the battery and extend the service life of the battery.

[0048] Among them, oxygen reacts with carbon monoxide → to generate carbon dioxide

[0049] Reaction formula:

[0050] The storage component includes a total gas storage box 702 and a total waste gas storage box 802. The total waste gas storage box 802 is arranged at the bottom end face of the second maintenance box 801. Inside the total waste gas storage box 802, there are a waste residue storage box, a waste gas storage box, and a neutralizing powder storage box; inside the total gas storage box 702, there are multiple gas storage boxes and a neutralizing gas storage box.

[0051] Preferably, some of the multiple gas storage boxes are used to store the adsorbed waste gas, and some gas storage boxes store carbon dioxide, which can be conveyed out through the gas adsorption holes 18 to cool the battery.

[0052] The material storage mechanism 9 is located on one end face of the electrolyte leakage maintenance mechanism 6. The material storage mechanism 9 is matched with the electrolyte leakage maintenance mechanism 6 and the cleaning mechanism. The material storage mechanism 9 includes a waste residue storage box 901 and a matching box 902. The waste residue storage box 901 is fixedly connected to the bottom end face of the matching box 902. The matching box 902 is matched with the electrolyte leakage maintenance mechanism 6. A slag guiding groove 903 is opened on the waste residue storage box 901. The bottom end face of the electrolyte leakage maintenance mechanism 6 is located inside the inner end face of the matching box 902, and the upper end face of the electrolyte leakage maintenance mechanism 6 is completely attached to the inner wall of the matching box 902.

[0053] Specifically, after the electrolyte leakage maintenance mechanism 6 finishes cleaning the upper end face of the sodium-ion battery module 4, it can control the electrolyte leakage maintenance mechanism 6 to push the cleaned impurities into the slag guiding groove 903 and drop them into the waste residue storage box 901 for storage.

[0054] As Figure 13 shown, the positive electrode material of the sodium-ion battery includes metal oxides, and the metal oxides are doped with one or a mixture of magnesium ions, aluminum ions, titanium ions, fluoride ions, and sulfide ions. Adding magnesium ions, aluminum ions, and titanium ions to the positive electrode material can stabilize the layered structure, inhibit phase change and volume expansion. Doping with fluoride ions, sulfide ions, etc. can enhance the structural stability and reduce oxygen evolution.

[0055] The outer end face of the metal oxide is sequentially wrapped with and carbon nanofibers. Coated with inert materials can reduce side reactions of the electrolyte, and carbon nanofibers can improve electronic conductivity.

[0056] During use, as Figure 2 shown, when impurities appear on the upper end face of the sodium-ion battery module 4 due to poor sealing, the electrolyte leakage maintenance mechanism 6 can be controlled to slide on the preliminary maintenance mechanism 7 and the sealed storage mechanism 8, and then control the first cleaning brush 603 and the adsorption brush strip 604 to clean the surface dust of the battery into the slag guiding groove 903.

[0057] As Figure 2 shown, when electrolyte leakage occurs on the upper end face of the sodium-ion battery module 4, especially between the connecting piece 3 and the sodium-ion battery module 4, the electrolyte leakage maintenance mechanism 6 can be controlled to move, thereby driving multiple second adsorption cleaning columns 609, adsorption brush strips 604, and first adsorption cleaning columns 6062 to adsorb the electrolyte, and adsorb and precipitate for 1 - 2 minutes for complete adsorption.

[0058] When a small amount of HF leaks, it will cause harm to the surrounding environment and human health. At this time, the generated HF needs to be processed again. By spraying dry lime powder or calcium carbonate through the second spray head 607, the first spraying column 6061, and the first spray hole 605, it can react with HF and neutralize HF to form calcium fluoride precipitate; After the calcium fluoride precipitates, it is adsorbed through the second adsorption hole 611, the enhanced adsorption column 608, the first adsorption cleaning column 6062, and the first adsorption hole of the second adsorption cleaning column 609, and the calcium fluoride is transported to the waste residue storage box for storage. At the same time, the first cleaning brush 603 and the adsorption brush strip 604 can clean the residual calcium fluoride into the slag guiding groove 903.

[0059] Example 2, as Figures 11-13As shown in the figure, the preliminary maintenance mechanism 7 includes an ultrasonic leak detector and a mobile spraying maintenance mechanism 11. The mobile spraying maintenance mechanism 11 includes a mobile spraying base 1101. A plurality of adsorption ball nozzles 1102 are fixedly connected to the bottom end face of the mobile spraying base 1101. A third air pump is arranged inside the adsorption ball nozzles 1102. The adsorption ball nozzles 1102 are respectively connected to the preliminary maintenance supply box and the third air pump. The third air pump is connected to the waste residue storage box in the total waste gas storage box 802 through a waste residue conveying pipe; The ultrasonic leak detector is installed on one side end face of the mobile spraying base 1101 to detect the leaked electrolyte. If leakage is detected, the mobile spraying base 1101 is started to move to the leakage point to accurately spray the electrolyte adsorption ball 15 to adsorb the electrolyte.

[0060] The preliminary maintenance supply box is installed on the inner wall end face of the first maintenance box 701. A plurality of electrolyte adsorption balls 15 are stored in the preliminary maintenance supply box. When electrolyte leakage occurs on the upper side end face of the sodium ion battery module 4, by controlling the movement of the mobile spraying base 1101 on the preliminary maintenance mechanism 7 and the sealed storage mechanism 8, a plurality of adsorption ball nozzles 1102 are driven to accurately spray the leaked electrolyte. At this time, a plurality of electrolyte adsorption balls 15 are stacked on the upper side of the electrolyte to adsorb the leaked electrolyte. After adsorption is completed, it is adsorbed through the adsorption ball nozzles 1102 and transported to the inside of the waste residue storage box for storage.

[0061] An explosion layer 16 and a fire extinguishing layer 17 are sequentially arranged inside the electrolyte adsorption ball 15. The electrolyte adsorption ball 15 is a mixture of one or more of cellulose and activated carbon to adsorb the leaked electrolyte.

[0062] The explosion layer 16 is a mixture of multiple of magnesium powder, potassium nitrate, epoxy resin, phenolic resin, carbonate (which can be ), phosphate, silicate and silicon dioxide, Potassium nitrate can generate potassium oxide solid particles, nitrogen and a small amount of oxygen. Nitrogen dilutes oxygen, and potassium oxide particles adsorb free radicals such as OH· to interrupt the combustion chain reaction. Oxygen resin and phenolic resin can fix the agent structure and delay the combustion speed to avoid the risk of deflagration. Carbonate and phosphate can neutralize acidic by-products such as to reduce the corrosion of equipment. Silicate and silicon dioxide can control the reaction temperature to prevent local overheating from igniting surrounding combustibles.

[0063] The fire extinguishing layer 17 is perfluoropentanone, which can quickly reduce the fire field temperature during a fire and cut off the combustion chain reaction.

[0064] Furthermore, a first partition layer is arranged between the electrolyte adsorption ball 15 and the explosion layer 16, and a second partition layer is arranged between the explosion layer 16 and the fire extinguishing layer 17. Both the first partition layer and the second partition layer are made of polyethylene.

[0065] Specifically, when a fire breaks out inside the battery, the adsorption ball nozzle 1102 can spray the electrolyte adsorption balls 15 into the fire source. At this time, the surface of the electrolyte adsorption balls 15 burns, and the bursting layer 16 and the fire extinguishing layer 17 come into contact with the fire source to carry out fire extinguishing treatment.

[0066] During use, when electrolyte leaks on the surface of the sodium-ion battery module 4, the ultrasonic leak detector gives an early warning, and the adsorption ball nozzle 1102 can be controlled to eject multiple electrolyte adsorption balls 15 to adsorb the electrolyte. After the adsorption is completed, a negative pressure is output through the adsorption ball nozzle 1102 to adsorb the multiple electrolyte adsorption balls 15 at this time and transport them to the inside of the waste residue storage box for storage.

[0067] When a fire source appears inside the battery, the temperature sensor immediately detects it, and multiple electrolyte adsorption balls 15 are sprayed through the adsorption ball nozzle 1102, and the fire source is extinguished under the action of the bursting layer 16 and the fire extinguishing layer 17. The difference between Example 1 and Example 2 lies in the different initial maintenance methods for electrolyte leakage. Example 1 uses the cooperation of the mobile spraying seat 1101 and the recovery roller 1003, and uses the adsorption pad 1002 to adsorb the leaked electrolyte, and then conducts subsequent treatment. While Example 2 uses the adsorption ball nozzle 1102 to eject multiple electrolyte adsorption balls 15 to adsorb the leaked electrolyte, which is suitable for large-volume batteries, with accurate spraying and fast adsorption efficiency.

[0068] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0069] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sodium ion battery positive electrode material, characterized in that: The positive electrode material of the sodium ion battery includes a metal oxide, wherein the metal oxide is doped with a mixture of one or more of magnesium ions, aluminum ions, titanium ions, fluoride ions, and sulfur ions, and the outer end surface of the metal oxide is sequentially wrapped with and carbon nanofibers.

2. A sodium ion battery, characterized in that: The invention comprises the sodium ion battery positive electrode material as claimed in claim 1, and also comprises an outer shell, a connecting sheet, a sodium ion battery module, a fixing plate and a battery control system, characterized in that it comprises: An electrolyte leakage maintenance mechanism is located on the upper end face of the sodium ion battery module, the electrolyte leakage maintenance mechanism includes a preliminary maintenance mechanism and a later maintenance mechanism, the later maintenance mechanism includes a cleaning component and a recycling component, the cleaning component matches the upper end face of the sodium ion battery module, the cleaning component includes a first adsorption cleaning column and a second adsorption cleaning column, the central end faces of the first adsorption cleaning column and the second adsorption cleaning column are both provided with a first adsorption hole, the preliminary maintenance mechanism performs preliminary adsorption on the leaked electrolyte, and the preliminary maintenance mechanism and the later maintenance mechanism slide on the inner wall end face of the outer shell; A cleaning mechanism is located on the top end surface of the sodium ion battery module, and the cleaning mechanism matches with multiple parts on the upper end surface of the sodium ion battery module; The oxygen absorption mechanism is located on the inner wall end face of the outer shell, and the oxygen absorption mechanism includes a gas processing component and a storage component. The gas processing component includes a gas adsorption hole, and the gas adsorption hole adsorbs the leaked gas.

3. A sodium ion battery according to claim 2, characterized in that: The preliminary maintenance mechanism includes a mobile spraying maintenance mechanism, and the mobile spraying maintenance mechanism includes a mobile spraying seat. The bottom end face of the mobile spraying seat is fixedly connected with a plurality of adsorption ball nozzles, and the adsorption ball nozzles are connected to a preliminary maintenance supply box, and the preliminary maintenance supply box is installed on the inner wall end face of the first maintenance box. A plurality of electrolyte adsorption balls are stored in the preliminary maintenance supply box, and a bursting layer and a fire extinguishing layer are sequentially arranged inside the electrolyte adsorption balls. The electrolyte adsorption balls and the second adsorption cleaning column are made of a mixture of one or more of cellulose, polystyrene and activated carbon, and the bursting layer is a mixture of more than one of magnesium powder, potassium nitrate, epoxy resin, phenolic resin, carbonate, phosphate, silicate and silicon dioxide, and the fire extinguishing layer is perfluorohexanone.

4. A sodium ion battery according to claim 3, characterized in that: The preliminary maintenance mechanism includes an ultrasonic leak detector, a preliminary adsorption mechanism, a sealed storage mechanism, a first maintenance box and a second maintenance box. The preliminary adsorption mechanism includes an adsorption pad reel and a recovery reel. The adsorption pad reel is installed on the inner wall end surface of the first maintenance box. An adsorption pad is wound on the adsorption pad reel. A fastening rope is connected between the adsorption pad and the recovery reel. The recovery reel is installed on the inner wall end surface of the second maintenance box. The second maintenance box is located on the upper side end surface of the recovery reel and is fixedly connected with an automatic telescopic door. A cutting knife is installed on one side end surface of the automatic telescopic door.

5. A sodium ion battery according to claim 4, characterized in that: The storage assembly includes a total gas storage box and a total waste gas storage box, a waste gas storage box is arranged on the bottom end surface of the second maintenance box, a waste residue storage box, a waste gas storage box, and a neutralization powder storage box are arranged in the total waste gas storage box, and a plurality of gas storage boxes and neutralization gas storage boxes are arranged in the total gas storage box; The gas processing component also includes a second air pump and a gas detector. A plurality of gas adsorption holes are arranged on one side end surface of the first maintenance box and the second maintenance box. The second air pump is connected to the gas adsorption holes. The gas adsorption holes are respectively connected to a gas storage box and a neutralization gas storage box. Carbon monoxide is stored in the neutralization gas storage box.

6. A sodium ion battery according to claim 5, characterized in that: The adsorption pad comprises an adsorption upper pad, and a plurality of adsorption columns are bonded to the bottom end surface of the adsorption upper pad.

7. A sodium ion battery according to claim 2 or 6, characterized in that: The cleaning mechanism includes a control base, the bottom end surface of the control base is movably connected to a bottom plate, the bottom end surface of the bottom plate is fixedly connected to a first cleaning brush and a second cleaning brush that match the surfaces of the sodium ion battery module, the connecting plate and the fixed plate, and the first cleaning brush and the second cleaning brush are fixedly connected.

8. A sodium ion battery according to claim 6, characterized in that: The recycling and processing component also includes a hydrogen fluoride gas detector, a second nozzle and a reinforced adsorption column. The hydrogen fluoride gas detector is installed on one side end face of the sealed storage mechanism. The top end face of the reinforced adsorption column is fixedly connected to multiple cutting blades. The reinforced adsorption column and the second adsorption cleaning column are both connected to the first air pump. One side end face of the first air pump is connected to the waste residue storage box. One side end face of the second nozzle is connected to the neutralization powder storage box. The second nozzle is provided with multiple hot air delivery holes, and the multiple hot air delivery holes are connected to a hot air blower. Dry lime powder or calcium carbonate is stored in the neutralization powder storage box.

9. A sodium ion battery according to claim 7, characterized in that: The bottom end face of the base plate is fixedly connected with an adsorption brush plate matching the end faces on both sides of the connecting piece, and an adsorption brush strip is bonded to the adsorption brush plate, and both the adsorption brush strip and the adsorption brush plate are provided with a plurality of first spray holes and second adsorption holes, and the base plate is located between a pair of the adsorption brush strips and is fixedly connected with a second cleaning brush, and a plurality of first adsorption cleaning columns and a first spray column are provided on the middle end face of the second cleaning brush, the first spray hole and the first spray column are both connected to a neutralizing powder storage box, and the first adsorption cleaning column and the second adsorption hole are both connected to a first air pump.

10. A sodium ion battery according to claim 2, characterized in that: The outer shell is provided with a material storage mechanism on one end face of the sodium ion battery module, and the material storage mechanism includes a waste residue storage box and a matching box. The bottom end face of the matching box is fixedly connected with the waste residue storage box, and a residue guiding groove is provided on the waste residue storage box.

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