Negative electrode sheet combustion support device

Abstract

The utility model relates to battery technology field especially relates to a negative pole piece combustion supporting device. It includes casing and atomization subassembly, the casing is equipped with reaction cavity, and the negative pole piece is in the self -ignition reaction in reaction cavity, the atomization subassembly passes through the water mist that is led to the reaction cavity to control the humidity in the reaction cavity reaches the self -ignition humidity of negative pole piece, the atomization subassembly includes ultrasonic atomizer, and the water mist export of ultrasonic atomizer is communicated with the mist exhaust structure, and the mist exhaust structure's export is arranged in the reaction cavity. In this application, the negative pole piece is made to burn through the mode that the reaction cavity humidity reaches the self -ignition humidity of negative pole piece, compared with the mode that the negative pole piece is directly contacted with water, the micron level gas-solid reaction interface is formed on the negative pole piece by water mist, and the reaction trigger is uniform, and the reaction intensity degree reduces, and the instantaneous hydrogen release concentration reduces, and the combustion safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a negative electrode combustion-supporting device. Background Technology

[0002] After battery disassembly, the charged negative electrode sheet, due to its high oxidation activity, will react rapidly upon contact with moisture or humidity in the air, potentially causing spontaneous combustion or explosion. In practice, the disassembled negative electrode sheet is often incinerated to eliminate this safety hazard. This prevents the spread of harmful substances, simplifies the processing procedure, and avoids harm to operators and the environment.

[0003] If the combustion of the negative electrode sheet were to rely entirely on its spontaneous combustion through reaction with water in the air, it would take too long, reducing work efficiency. Furthermore, the reaction would be uncontrollable, depending entirely on air humidity, and the reaction time would be highly random, posing a potential danger. Therefore, during the disassembly and processing of the negative electrode sheet, a small amount of water is often added to accelerate its combustion.

[0004] Patent document CN220205763U discloses a battery negative electrode incineration device, including a housing, an ignition spray system, and a cooling system. The housing defines a reaction chamber, and a furnace door is provided on one side of the housing. The ignition spray system extends into the reaction chamber and sprays out a reaction medium that can react with the battery negative electrode. The cooling system is disposed in the reaction chamber and can cool the reaction chamber so that the temperature inside the reaction chamber is lower than a preset safe temperature. The reaction medium is directly sprayed by the ignition spray system, so that the reaction medium directly reacts chemically with the battery negative electrode to incinerate the battery negative electrode through chemical reaction.

[0005] In this existing technology, sprayed water reacts with the negative electrode. The sprayed water is directly sprayed onto the negative electrode, and the water is in direct contact with the negative electrode. This has problems such as violent reaction, uneven reaction, large amount of heat release, and instantaneous generation of a large amount of hydrogen gas, which increases the risk. Utility Model Content

[0006] This invention aims to solve the above problems by providing a negative electrode combustion aid device that reduces the intensity of the reaction and improves safety.

[0007] The technical solution to this problem is to provide a negative electrode combustion aid device, including a housing and an atomizing component; the housing is provided with a reaction chamber, in which the negative electrode undergoes a spontaneous combustion reaction; the atomizing component controls the humidity in the reaction chamber to the spontaneous combustion humidity of the negative electrode by introducing water mist into the reaction chamber; the atomizing component includes an ultrasonic atomizer and a mist exhaust structure connected to the water mist outlet of the ultrasonic atomizer, the outlet of the mist exhaust structure being disposed in the reaction chamber.

[0008] As a preferred embodiment of the present invention, the mist exhaust structure includes a mist exhaust pipe installed along the height direction of the reaction chamber, and a plurality of mist outlets sequentially arranged along the height direction of the reaction chamber on the mist exhaust pipe, wherein the outlet of the mist outlet is located inside the reaction chamber.

[0009] As a preferred embodiment of this invention, the mist exhaust pipe includes a first mist exhaust pipe and a second mist exhaust pipe, and the mist outlet includes a first mist outlet disposed in the first mist exhaust pipe and a second mist outlet disposed in the second mist exhaust pipe; the outlet of the second mist outlet faces the negative electrode plate in the reaction chamber, and the outlet of the first mist outlet is far away from the negative electrode plate in the reaction chamber.

[0010] As a preferred embodiment of the present invention, the atomizing component includes a plurality of first mist exhaust pipes and a plurality of second mist exhaust pipes, wherein the first mist exhaust pipes and the second mist exhaust pipes are uniformly distributed in a ring around the central axis of the reaction chamber.

[0011] As a preferred embodiment of the present invention, a receiving basket for accommodating the negative electrode sheet is suspended inside the reaction chamber, and the receiving basket is provided with a communicating hole for communicating with the inner cavity of the receiving basket and the reaction chamber.

[0012] As a preferred embodiment of this invention, the accommodating basket is spherical.

[0013] As a preferred embodiment of this utility model, it further includes a suspension rod, one end of which is disposed outside the housing and has a control head, and the other end is disposed inside the reaction chamber and connected to the receiving basket; the housing has a mounting hole through which the suspension rod can pass, and the suspension rod is movably connected to the mounting hole.

[0014] As a preferred embodiment of this invention, the suspension rod and the accommodating basket are connected by an elastic element.

[0015] As a preferred embodiment of this utility model, the suspension rod includes a fixed sleeve and a movable inner rod that is axially slidably connected to the fixed sleeve, with the fixed sleeve sleeved over the movable inner rod; the fixed sleeve is threadedly connected to the mounting hole of the housing, and the control head is provided at one end of the fixed sleeve located outside the housing; one end of the movable inner rod is connected to the receiving basket, and the other end is located outside the housing and is provided with a pressing head, with a spring-loaded component sleeved on the portion of the movable inner rod located between the pressing head and the control head.

[0016] As a preferred embodiment of this invention, a hygrometer is provided at the upper and lower parts of the reaction chamber.

[0017] The beneficial effects of this utility model are:

[0018] 1. In this application, the negative electrode is ignited by controlling the humidity of the reaction chamber to achieve the auto-ignition humidity (30%~80%) of the negative electrode. Compared with the method of directly contacting the negative electrode with water, the water mist forms a micron-level gas-solid reaction interface on the negative electrode, which results in uniform reaction triggering, reduced reaction intensity, and reduced instantaneous hydrogen release concentration, thereby improving combustion safety.

[0019] 2. In some embodiments, a mist exhaust pipe and a mist outlet are arranged along the height of the reaction chamber to increase the speed at which the humidity inside the reaction chamber reaches the target humidity and ensure uniform humidity inside the reaction chamber. In other embodiments, a first mist outlet located away from the negative electrode is provided to control the humidity inside the reaction chamber to approach the auto-ignition humidity, avoiding sudden spontaneous combustion caused by uneven humidity on the surface of the negative electrode during the water mist distribution process inside the reaction chamber; at the same time, a second mist outlet located close to the negative electrode is provided to control the humidity around the negative electrode to reach the auto-ignition humidity before spontaneous combustion begins, making the start time of the combustion reaction more controllable.

[0020] 3. In some embodiments, a receiving basket with connecting holes is designed to reduce the area of ​​the receiving basket's solid portion covering the negative electrode sheet, thereby increasing the area of ​​the negative electrode sheet that can contact water mist and ensuring complete combustion. In other embodiments, an elastic element and / or a rebound element is provided to assist the vibration of the receiving basket and the negative electrode sheet within it, further improving the uniformity of the overall contact between the negative electrode sheet and the water mist, and also helping impurities generated during combustion on the negative electrode sheet to fall off, preventing impurities from hindering the continued combustion of the negative electrode sheet, further ensuring complete combustion. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of one embodiment of a negative electrode combustion-supporting device;

[0022] Figure 2 This is a top view of the installation of a mist exhaust structure for a negative electrode combustion aid device.

[0023] Figure 3 This is a schematic diagram of another implementation of a negative electrode combustion aid device;

[0024] Figure 4 This is a schematic diagram of another implementation of a negative electrode combustion aid device;

[0025] In the figure: shell 1, reaction chamber 11, mist exhaust pipe 21, first mist exhaust pipe 211, second mist exhaust pipe 212, mist outlet 22, first mist outlet 221, second mist outlet 222, accommodating basket 31, suspension rod 32, fixed sleeve 321, movable inner rod 322, elastic element 33, and rebound element 34. Detailed Implementation

[0026] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] A negative electrode combustion aid device, such as Figure 1 As shown, it includes a housing 1 and an atomizing assembly. The housing 1 is provided with a reaction chamber 11, in which the negative electrode undergoes a spontaneous combustion reaction. The atomizing assembly controls the humidity in the reaction chamber 11 to achieve the spontaneous combustion humidity of the negative electrode by introducing water mist into the reaction chamber 11.

[0028] The shell 1 includes a main body and a cover detachably connected to the main body, forming a reaction chamber 11 between the main body and the cover. The materials of the main body and the cover should be corrosion-resistant and able to withstand the combustion temperature of the negative electrode, such as stainless steel or Hastelloy. The detachable connection method between the main body and the cover is not limited; it can be a snap-fit ​​connection or a threaded connection. Furthermore, a venting diaphragm is provided on the cover to ensure safety. Specifically, the shell 1 can be a commercially available small laboratory reactor, which can meet the above requirements. In some embodiments, the shell 1 adopts a main body with a conical or arc-shaped bottom, and a drain port and valve are provided at the lowest point of the bottom to facilitate the accumulation and discharge of combustion impurities and condensate.

[0029] To ensure the fineness of the water mist particles, the atomizing component uses an ultrasonic atomizer as the main atomizing structure. Existing technology and commercially available ultrasonic atomizers are sufficient. They primarily break water into micron-sized droplets through high-frequency vibrating atomizing plates, and then, with the assistance of an airflow generated by a fan or air pump, these droplets are delivered from the water mist outlet. In this application, a mist exhaust structure is provided at the water mist outlet to deliver the water mist into the reaction chamber 11.

[0030] In some implementations, such as Figure 1 and Figure 2 As shown, the de-misting structure includes a de-misting pipe 21 and several mist outlets 22 arranged sequentially along the length of the de-misting pipe 21. The de-misting pipe 21 is installed on the inner wall of the housing 1 via a clamp or similar structure. During installation, the length of the de-misting pipe 21 is along the height of the reaction chamber 11, which ensures that the mist outlets 22 are arranged along the height of the reaction chamber 11, guaranteeing uniform mist output in the vertical direction within the reaction chamber 11. Multiple de-misting pipes 21 can be designed, such as... Figure 2 As shown, several mist exhaust pipes 21 are uniformly arranged in a ring around the central axis of the reaction chamber 11 to ensure uniform mist output in the circumferential direction within the reaction chamber 11. Each mist exhaust pipe 21 is connected to the water mist outlet of the ultrasonic atomizer via a connecting pipe. The housing 1 has an installation hole through which the connecting pipe can pass, and a sealing ring is provided between the outer wall of the connecting pipe and the installation hole. The portion of the connecting pipe outside the housing 1 is equipped with a valve to control whether mist enters its corresponding mist exhaust pipe 21.

[0031] In some implementations, such as Figure 1 and Figure 2 As shown, the mist exhaust pipe 21 is divided into a first mist exhaust pipe 211 and a second mist exhaust pipe 212, which are spaced apart. The mist outlet 22 on the first mist exhaust pipe 211 is the first mist outlet 221. With the negative electrode plate's accommodating portion in the reaction chamber 11 as the boundary, the outlet of the first mist outlet 221 on the upper part of the first mist exhaust pipe 211 faces upwards, and the outlet of the first mist outlet 221 on the lower part of the first mist exhaust pipe 211 faces downwards, both away from the negative electrode plate. The first mist outlet 221 is mainly used to spray to a background humidity level in the reaction chamber 11 close to the auto-ignition humidity of the negative electrode plate. The mist outlet 22 on the second mist exhaust pipe 212 is the second mist outlet 222. Similarly, with the negative electrode plate's accommodating portion in the reaction chamber 11 as the boundary, the outlet of the second mist outlet 222 on the upper part of the second mist exhaust pipe 212 faces downwards, and the outlet of the second mist outlet 222 on the upper part of the second mist exhaust pipe 212 faces upwards, both close to the negative electrode plate. After the first mist outlet 221 brings the humidity in the reaction chamber 11 close to the auto-ignition humidity of the negative electrode, the second mist outlet 222 is controlled by the valve of the connecting pipe corresponding to the second mist exhaust pipe 212 to intermittently produce mist, mainly to spray the humidity near the negative electrode to reach the auto-ignition humidity of the negative electrode.

[0032] To facilitate observation of the humidity within the reaction chamber 11, hygrometers are installed at the upper and lower parts of the chamber. A transparent window is provided on the shell wall of the housing 1 at the position corresponding to the hygrometer for easy observation of the humidity reading; alternatively, a Bluetooth hygrometer can be used to directly transmit the humidity reading to the operator's device.

[0033] In some implementations, to ensure the uniformity of humidity received by the negative electrode surface, such as... Figure 1 As shown, a receiving basket 31 for accommodating the negative electrode sheet is suspended inside the reaction chamber 11. The receiving basket 31 has a communicating hole for communicating with the inner cavity of the receiving basket 31 and the reaction chamber 11. The shape of the receiving basket 31 is not limited and can be cubic, spherical, or even irregular in shape. Regardless of the shape of the receiving basket 31, it should be ensured that several communicating holes are evenly provided on each surface, and the size of the communicating holes should not exceed the size of the negative electrode sheet. The receiving basket 31 is usually composed of two detachably connected parts to facilitate the filling of the negative electrode sheet.

[0034] Because the disassembled lithium battery negative electrode sheets are roughly formed as follows Figure 1 As shown: the structure in which two adjacent sheet-like portions are connected by an arc-shaped portion created by winding makes the negative electrode sheet mainly exhibit a sheet-like structure. Therefore, in some embodiments, such as Figure 1As shown, the receiving basket 31 is spherical, reducing the contact area between the negative electrode plate and the solid part of the receiving basket 31. The spherical receiving basket 31 can be formed by two hemispherical half-shells that are detachably connected. One end of the two half-shells is hinged to each other, and the other end is engaged by a groove and a protrusion; or / and an edge is provided on the outer surface of the half-shell. The edges of the two half-shells are provided with corresponding through holes and are connected by screws and nuts.

[0035] The structure used to suspend the accommodating basket 31 can be a suspension rod or a suspension rope. In some embodiments, a suspension rod 32 is used. One end of the suspension rod 32 is located outside the housing 1 and is equipped with a control head, while the other end is located inside the reaction chamber 11 and connected to the accommodating basket 31. The housing 1 has a mounting hole through which the suspension rod 32 can pass, and the suspension rod 32 is movably connected to the mounting hole. The movable connection can be a threaded connection or a sliding connection. By rotating or moving the control head, the suspension rod 32 can be moved vertically to adjust the suspension position of the accommodating basket 31 in the reaction chamber 11. At this time, the reaction chamber 11 is divided into an upper zone, a reaction zone, and a lower zone along the height direction. The first mist outlet 221 in the upper zone faces upward and the second mist outlet 222 faces downward, while the first mist outlet 221 in the lower zone faces downward and the second mist outlet 222 faces upward. The suspension rod 32 is adjusted to send the accommodating basket 31 into the reaction zone.

[0036] In some implementations, such as Figure 1 As shown, the suspension rod 32 is connected to the receiving basket 31 via an elastic element 33, the elastic extension and contraction direction of which is vertical. When the elastic force of the elastic element 33 is balanced with the weight of the receiving basket 31 and its internal negative electrode plate, the receiving basket 31 is located in the reaction zone. When the suspension rod 32 is adjusted, the elastic element 33, based on inertia and elastic deformation, can assist the receiving basket 31 in vibrating, causing the internal negative electrode plate to vibrate and improving its contact uniformity with the water mist. The extension and contraction range of the elastic element 33 does not need to be too large, just enough to ensure that the receiving basket 31 vibrates back and forth within the reaction zone.

[0037] In some implementations, such as Figure 3 and Figure 4 As shown, the suspension rod 32 includes a fixed sleeve 321 and a movable inner rod 322 that is axially slidably connected to the fixed sleeve 321, with the fixed sleeve 321 sleeved over the movable inner rod 322. The fixed sleeve 321 is threadedly connected to the mounting hole of the housing 1, and a control head is provided at one end of the fixed sleeve 321 located outside the housing 1. The fixed sleeve 321 is used to control the installation position of the suspension rod 32. The lower end of the movable inner rod 322 can be... Figure 3 As shown, the lower end of the movable inner rod 322 passes through the fixed sleeve 321 and is connected to the receiving basket 31 via the elastic element 33; it can also be as follows: Figure 4 As shown, the lower end of the movable inner rod 322 passes through the fixed sleeve 321 and connects directly to the receiving basket 31. Regarding the upper end of the movable inner rod 322, as... Figure 3 and Figure 4 As shown, the upper end of the movable inner rod 322 extends through the fixed sleeve 321 and the control head, and a pressing head is provided thereon. A spring-loaded member 34 is fitted onto the portion of the movable inner rod 322 located between the pressing head and the control head. The movable inner rod 322 is used to induce vibration. In use, the operator drives the pressing head towards the control head, causing the spring-loaded member 34 to compress. After the operator removes the pressing force, the spring-loaded member 34 causes the pressing head and the movable inner rod 322 to rebound, thereby generating vibration and assisting the vibration of the receiving basket 31. In embodiments where the elastic member 33 is used simultaneously, the operator's driving of the pressing head and the removal of the pressing force will also cause the elastic member 33 to vibrate, driving the receiving basket 31 and its internal negative electrode plate to vibrate. Furthermore, a stop block is provided on the section of the movable inner rod 322 located within the reaction chamber 11. Excessive rebound is prevented by the stop block abutting against the bottom end of the fixed sleeve 321 during the rebound.

[0038] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A negative electrode combustion-supporting device, characterized in that: Includes a housing (1) and an atomizing assembly, The housing (1) is provided with a reaction chamber (11), and the negative electrode plate undergoes a spontaneous combustion reaction in the reaction chamber (11); The atomizing component controls the humidity inside the reaction chamber (11) to reach the auto-ignition humidity of the negative electrode by introducing water mist into the reaction chamber (11); the atomizing component includes an ultrasonic atomizer and a mist exhaust structure connected to the water mist outlet of the ultrasonic atomizer, and the outlet of the mist exhaust structure is located inside the reaction chamber (11).

2. The negative electrode combustion aid device according to claim 1, characterized in that: The mist exhaust structure includes a mist exhaust pipe (21) installed along the height direction of the reaction chamber (11) and a plurality of mist outlets (22) arranged sequentially along the height direction of the reaction chamber (11) on the mist exhaust pipe (21), with the outlet of the mist outlet (22) located inside the reaction chamber (11).

3. The negative electrode combustion aid device according to claim 2, characterized in that: The mist exhaust pipe (21) includes a first mist exhaust pipe (211) and a second mist exhaust pipe (212). The mist outlet (22) includes a first mist outlet (221) disposed on the first mist exhaust pipe (211) and a second mist outlet (222) disposed on the second mist exhaust pipe (212). The outlet of the second mist outlet (222) faces the negative electrode plate in the reaction chamber (11), and the outlet of the first mist outlet (221) is far away from the negative electrode plate in the reaction chamber (11).

4. The negative electrode combustion aid device according to claim 3, characterized in that: The atomizing component includes a plurality of first mist exhaust pipes (211) and a plurality of second mist exhaust pipes (212), wherein the first mist exhaust pipes (211) and the second mist exhaust pipes (212) are evenly distributed in a ring around the central axis of the reaction chamber (11).

5. The negative electrode combustion aid device according to claim 1, characterized in that: The reaction chamber (11) is provided with a accommodating basket (31) for accommodating the negative electrode sheet, and the accommodating basket (31) is provided with a connecting hole for communicating with the reaction chamber (11).

6. The negative electrode combustion aid device according to claim 5, characterized in that: The accommodating basket (31) is spherical.

7. A negative electrode combustion-supporting device according to claim 5 or 6, characterized in that: It also includes a suspension rod (32), one end of which is disposed outside the housing (1) and has a control head, and the other end is disposed inside the reaction chamber (11) and connected to the accommodating basket (31); the housing (1) has a mounting hole through which the suspension rod (32) can pass, and the suspension rod (32) is movably connected to the mounting hole.

8. The negative electrode combustion aid device according to claim 7, characterized in that: The suspension rod (32) is connected to the accommodating basket (31) by an elastic element (33).

9. The negative electrode combustion aid device according to claim 7, characterized in that: The suspension rod (32) includes a fixed sleeve (321) and a movable inner rod (322) that is slidably connected to the fixed sleeve (321) along the axial direction. The fixed sleeve (321) is sleeved on the movable inner rod (322). The fixed sleeve (321) is threadedly connected to the mounting hole of the housing (1), and the control head is provided at one end of the fixed sleeve (321) located outside the housing (1); One end of the movable inner rod (322) is connected to the accommodating basket (31), and the other end is located outside the housing (1) and is provided with a pressing head. The portion of the movable inner rod (322) located between the pressing head and the control head is fitted with a spring-loaded component (34).

10. The negative electrode combustion aid device according to claim 1, characterized in that: The upper and lower parts of the reaction chamber (11) are respectively equipped with hygrometers.

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