Device for treating lithium iron phosphate fully-charged negative plate

Abstract

The utility model discloses a device for treating a lithium iron phosphate full-electricity negative plate, which relates to the technical field of new energy power batteries, utilizes a heating element to create a high-temperature condition, utilizes an air exhaust mechanism to create a vacuum condition, gasifies graphite in the lithium iron phosphate full-electricity negative plate into carbon monoxide and hydrogen, and then utilizes a nozzle to spray the carbon monoxide and the hydrogen into the lithium iron phosphate full-electricity negative plate. After the pressure bin is cooled to the normal temperature, high-speed airflow in the nozzle ejects the water gas out, the water gas is mixed with air and then ignited to generate carbon dioxide and water, the lithium iron phosphate full-electricity negative plate is finally decomposed into harmless carbon dioxide and water, and the green environment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy power batteries, and in particular to a device for processing fully charged negative electrode sheets of lithium iron phosphate. Background Art

[0002] Lithium iron phosphate battery is a lithium-ion battery that uses lithium iron phosphate as the positive electrode material and carbon as the negative electrode material.

[0003] At present, in the development and production process of lithium iron phosphate batteries, in order to ensure product design indicators and discover problems, fully charged batteries need to be disassembled. However, the negative electrode is full of lithium, and it is easy to spontaneously combust when exposed to moisture in the air after disassembly. When disassembling, attention must be paid to separating the positive and negative electrode sheets, and also to the debris dropped from the positive and negative electrodes, which will also burn if touched. At present, there is no green and environmentally friendly solution for the fully charged negative electrode sheets after disassembly. For this reason, the utility model proposes a device for processing fully charged negative electrode sheets of lithium iron phosphate. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a device for processing a fully charged negative electrode sheet of lithium iron phosphate.

[0005] The utility model proposes a device for processing fully charged negative electrode sheets of lithium iron phosphate, comprising a pressure chamber, a heating element installed in the pressure chamber, and the heating element is used to increase the temperature in the pressure chamber, a ceramic box is provided on the heating element, and the ceramic box is placed on the heating element, and the ceramic box is used to place the fully charged negative electrode sheets of lithium iron phosphate, a nozzle is connected to the pressure chamber, and the nozzle is used to spray water gas, an exhaust mechanism is provided on the pressure chamber, and the exhaust mechanism is used to evacuate the pressure chamber, and the exhaust mechanism is used to supply air to the pressure chamber.

[0006] Preferably, the exhaust mechanism includes an exhaust fan, and the exhaust port of the exhaust fan is connected to a first three-way valve, the first three-way valve is respectively connected to a first exhaust pipe and a second exhaust pipe, the first exhaust pipe is connected to the pressure chamber, the first exhaust pipe is used for vacuuming the pressure chamber, and the second exhaust pipe is used for extracting external air, the exhaust fan is connected to a second three-way valve at its outlet, the second three-way valve is respectively connected to a first outlet pipe and a second outlet pipe, the first outlet pipe is used to discharge the air vacuumized by the first exhaust pipe from the pressure chamber, the second outlet pipe is used to discharge the air extracted by the second exhaust pipe to the pressure chamber, and the second outlet pipe is connected to the pressure chamber.

[0007] Preferably, solenoid valves are installed on the first exhaust pipe, the second exhaust pipe, the first air outlet pipe and the second air outlet pipe.

[0008] Preferably, the heating element is a heater.

[0009] Preferably, the upper cover of the ceramic box is provided with a sealing cover, and a plurality of through holes are opened on the outer circumference of the ceramic box, and a metal mesh is installed in the ceramic box.

[0010] Preferably, a sealing door is installed on the pressure chamber.

[0011] In the present invention, the device for processing a fully charged negative electrode sheet of lithium iron phosphate has the following beneficial technical effects:

[0012] A heating element is used to create high temperature conditions, and a vacuum mechanism is used to create vacuum conditions, so that the graphite in the fully charged negative electrode sheet of the lithium iron phosphate battery is gasified into carbon monoxide and hydrogen. Then, a nozzle is used to wait for the pressure chamber to cool down to room temperature, and the high-speed airflow in the nozzle ejects the water gas and mixes it with air and ignites it to generate carbon dioxide and water, so that the fully charged negative electrode sheet of the lithium iron phosphate battery is finally decomposed into harmless carbon dioxide and water, thereby protecting the green environment. A device for processing fully charged negative electrode sheets of lithium iron phosphate batteries is provided, which decomposes the fully charged negative electrode sheets in a high temperature and high pressure environment, and generates harmless carbon dioxide and water by burning exhaust gas, and has broad application prospects.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the structure of the utility model;

[0015] Figure 2 It is the front view of the structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the separation of the sealing cover and the ceramic box of the utility model;

[0017] Figure 4 It is a top view schematic diagram of the ceramic box of the utility model.

[0018] In the figure, 1. pressure chamber; 2. heating element; 3. ceramic box; 4. nozzle; 5. exhaust mechanism; 51. exhaust fan; 52. first three-way valve; 53. first exhaust pipe; 54. second exhaust pipe; 55. second three-way valve; 56. first air outlet pipe; 57. second air outlet pipe; 6. sealing cover; 7. through hole; 8. metal mesh; 9. sealing door. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] like Figure 1-Figure 4 A device for processing fully charged negative electrode sheets of lithium iron phosphate is shown, including a pressure chamber 1, a heating element 2 is installed in the pressure chamber 1, and the heating element 2 is used to increase the temperature in the pressure chamber 1, a ceramic box 3 is provided on the heating element 2, and the ceramic box 3 is placed on the heating element 2, and the ceramic box 3 is used to place the fully charged negative electrode sheets of lithium iron phosphate, and the pressure chamber 1 is connected with a nozzle 4, the nozzle 4 is a prior art, the nozzle 4 is a device that uses a high-speed airflow to spray water gas and ignite it after mixing with air, which can achieve flameless or micro-flame combustion and reduce pollution to the environment, and the nozzle 4 is used to spray water gas, and the pressure chamber 1 is provided with a vacuum mechanism 5, and the vacuum mechanism 5 is used to evacuate the pressure chamber 1, and the vacuum mechanism 5 is used to supply air to the pressure chamber 1.

[0021] A further improvement of the technical solution is that the exhaust mechanism 5 includes an exhaust fan 51, and the exhaust port of the exhaust fan 51 is connected to a first three-way valve 52, the first three-way valve 52 is respectively connected to a first exhaust pipe 53 and a second exhaust pipe 54, the first exhaust pipe 53 is connected to the pressure chamber 1, the first exhaust pipe 53 is used for vacuumizing the pressure chamber 1, and the second exhaust pipe 54 is used to extract external air, the air outlet of the exhaust fan 51 is connected to a second three-way valve 55, the second three-way valve 55 is respectively connected to a first outlet pipe 56 and a second outlet pipe 57, the first outlet pipe 56 is used to discharge the air vacuumized by the first exhaust pipe 53 from the pressure chamber 1, the second outlet pipe 57 is used to discharge the air sucked by the second exhaust pipe 54 to the pressure chamber 1, the second outlet pipe 57 is connected to the pressure chamber 1, and solenoid valves are installed on the first exhaust pipe 53, the second exhaust pipe 54, the first outlet pipe 56 and the second outlet pipe 57.

[0022] A further improvement of the technical solution is that the air extraction mechanism 5 can be replaced by other existing air extraction structures that can realize vacuuming and air supply to the pressure chamber 1.

[0023] A further improvement of the technical solution is that the heating element 2 is a heater, and the heater is a prior art.

[0024] A further improvement of the technical solution is that a cover 6 is provided on the upper cover of the ceramic box 3 , and a plurality of through holes 7 are opened on the outer periphery of the ceramic box 3 , and a metal mesh 8 is installed inside the ceramic box 3 , and the metal mesh 8 is a high temperature resistant metal mesh 8 .

[0025] A further improvement of the technical solution is that a sealing door 9 is installed on the pressure chamber 1.

[0026] The heating element 2 is used to create high temperature conditions, and the exhaust mechanism 5 is used to create vacuum conditions, so that the graphite in the fully charged negative electrode sheet of lithium iron phosphate is gasified into carbon monoxide and hydrogen. Then, the nozzle 4 is used to wait for the pressure chamber 1 to cool down to room temperature. The high-speed airflow in the nozzle 4 sprays out the water gas and mixes with the air and ignites to generate carbon dioxide and water, and finally decomposes the fully charged negative electrode sheet of lithium iron phosphate into harmless carbon dioxide and water, thereby protecting the green environment.

[0027] The present application is also applicable to the fully charged negative electrode sheet of the ternary battery after disassembly.

[0028] During the working process of this embodiment:

[0029] Place the fully charged negative electrode of the lithium battery into the ceramic box 3 with the high temperature resistant metal mesh 8 and put it into the pressure chamber 1;

[0030] The sealing door 9 of the pressure chamber 1 is closed, the first exhaust pipe 53 and the first outlet pipe 56 of the exhaust mechanism 5 are in an open state, the second exhaust pipe 54 and the second outlet pipe 57 are in a closed state, and vacuuming is performed. After the pressure in the vacuum chamber 1 is increased to 0.01-0.1 kPa, the temperature rises to 800-1000°C and is maintained for 30-60 minutes;

[0031] Wait for the pressure chamber 1 to cool down to room temperature, the first exhaust pipe 53 and the first air outlet pipe 56 of the exhaust mechanism 5 are in a closed state, the second exhaust pipe 54 and the second air outlet pipe 57 are in an open state, the second air outlet pipe 57 supplies air, and the nozzle 4 sprays out a high-speed airflow to spray the water gas out and mix it with the air and then ignite it to generate carbon dioxide and water. This is because the original carbon monoxide can be converted into carbon dioxide after combustion.

[0032] Design principle:

[0033] 1. Under high temperature and vacuum conditions, the graphite in the fully charged negative electrode of the lithium battery is gasified into carbon monoxide and hydrogen. The mechanism of the pyrolysis reaction is: when the fully charged negative electrode of the lithium iron phosphate battery is heated, the lithium atoms embedded in the graphite will diffuse to the surface and react violently with water or oxygen in the air, generating a large amount of heat and gas. Under vacuum conditions, the concentration of water or oxygen is very low, so the lithium atoms mainly react with the carbon atoms in the graphite to generate carbon monoxide and hydrogen.

[0034] The kinetic principle of pyrolysis reaction is that the rate of pyrolysis reaction is affected by factors such as temperature, pressure, embedded lithium content, and graphite structure. Generally speaking, the higher the temperature, the lower the pressure, the higher the embedded lithium content, the looser the graphite structure, and the faster the rate of pyrolysis reaction. When the temperature is 800-1000℃ and the pressure is 0.01-0.1kPa, the pyrolysis reaction can be completed within 30-60min.

[0035] The present application utilizes the vacuum mechanism 5 to evacuate the pressure chamber 1, and the heating element 2 heats the inside of the pressure chamber 1 to form a high-temperature vacuum chamber.

[0036] 2. Use the nozzle to burn the water gas

[0037] Nozzle combustion principle: The nozzle is a device that uses high-speed airflow to spray water gas and ignite it after mixing with air. It can achieve flameless or micro-flame combustion and reduce pollution to the environment. The principle of the nozzle is to use Bernoulli's principle. When water gas passes through the nozzle, its pressure decreases, the speed increases, and negative pressure is generated at the same time, sucking in air. When the mixing ratio of air and water gas reaches a certain range, it can be ignited at the nozzle outlet to form a stable flame. The advantages of the nozzle are simple structure, easy operation, safety and reliability, energy saving and environmental protection.

[0038] The present application utilizes an air suction mechanism 5 to provide air, which cooperates with the nozzle 4 .

[0039] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0040] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for processing fully charged lithium iron phosphate negative electrode sheets, characterized in that: The invention comprises a pressure chamber (1), wherein a heating element (2) is installed in the pressure chamber (1), and the heating element (2) is used to increase the temperature in the pressure chamber (1); a ceramic box (3) is arranged on the heating element (2), and the ceramic box (3) is used to place a fully charged negative electrode sheet of lithium iron phosphate; a nozzle (4) is connected to the pressure chamber (1), and the nozzle (4) is used to spray water gas; an exhaust mechanism (5) is arranged on the pressure chamber (1), and the exhaust mechanism (5) is used to evacuate the pressure chamber (1); and the exhaust mechanism (5) is used to supply air to the pressure chamber (1).

2. The device for processing fully charged lithium iron phosphate negative electrode sheets according to claim 1, characterized in that: The exhaust mechanism (5) comprises an exhaust fan (51), and an exhaust port of the exhaust fan (51) is connected to a first three-way valve (52), and the first three-way valve (52) is respectively connected to a first exhaust pipe (53) and a second exhaust pipe (54), the first exhaust pipe (53) is connected to the pressure chamber (1), the first exhaust pipe (53) is used for vacuuming the pressure chamber (1), and the second exhaust pipe (54) is used for extracting external air, the exhaust port of the exhaust fan (51) is connected to a second three-way valve (55), and the second three-way valve (55) is respectively connected to a first outlet pipe (56) and a second outlet pipe (57), the first outlet pipe (56) is used for discharging air vacuumed by the first exhaust pipe (53) from the pressure chamber (1), and the second outlet pipe (57) is used for discharging air sucked by the second exhaust pipe (54) into the pressure chamber (1), and the second outlet pipe (57) is connected to the pressure chamber (1).

3. The device for processing fully charged lithium iron phosphate negative electrode sheets according to claim 2, characterized in that: Solenoid valves are installed on the first air exhaust pipe (53), the second air exhaust pipe (54), the first air outlet pipe (56) and the second air outlet pipe (57).

4. The device for processing fully charged lithium iron phosphate negative electrode sheets according to claim 1, characterized in that: The heating element (2) is a heater.

5. The device for processing fully charged lithium iron phosphate negative electrode sheets according to claim 1, characterized in that: The ceramic box (3) is covered with a sealing cover (6), and a plurality of through holes (7) are opened on the outer periphery of the ceramic box (3). A metal mesh (8) is installed inside the ceramic box (3).

6. The device for processing fully charged lithium iron phosphate negative electrode sheets according to claim 1, characterized in that: The pressure chamber (1) is provided with a sealing door (9).

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