JP2013191465A - Recycling apparatus of secondary batteries - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recycling apparatus of secondary batteries in which the thermal decomposition products discharged during heat treatment can be efficiently recovered as waste fluid and waste gas.SOLUTION: The recycling apparatus of secondary batteries includes a heat treatment tank 12 for heating secondary batteries 10, a cooling device 18 for cooling thermal decomposition products discharged from the secondary batteries 10 thus heated, piping 22c through which the thermal decomposition products thus cooled flow and piping 22d branched from the piping 22c, a waste liquid tank 20 installed on the discharge side of the piping 22c and storing the thermal decomposition products, and a purifier 24 installed on the discharge side of the piping 22d and purifying the thermal decomposition products. The piping 22c between the branch position of the piping 22d and the waste liquid tank 20 is provided with a holding section 30 for holding the liquid 30a, and the passage of the piping 22c is closed by the liquid 30a in the holding section 30.

Description

  The present invention relates to a technology of a secondary battery recycling apparatus.

  When a secondary battery such as a lithium ion secondary battery or a nickel hydride secondary battery is used as a vehicle component such as a hybrid vehicle, for example, when the vehicle is disused, the secondary battery is After being removed from, it is disassembled and useful metals are recovered.

  Generally, a secondary battery used as an automobile part generates a high voltage (for example, 300 V or more), and maintains a high voltage even when the vehicle is removed as a scrap car. There are many. Usually, the work of disassembling the secondary battery is performed manually by an operator wearing protective equipment such as an insulating glove. Therefore, sufficient consideration must be given to ensuring the safety of the work.

  In order to enhance the safety of the secondary battery disassembly work, etc., it is conceivable to discharge the secondary battery. In this case, the secondary battery is stored for a long period of time and discharged naturally, or a resistor, etc. Therefore, it is necessary to forcibly discharge the battery, and the recycling process of the secondary battery takes a long time or takes time, so that the recycling process cannot be performed efficiently.

  Conventionally, various methods for recovering valuable materials from secondary batteries have been proposed (for example, see Patent Documents 1 to 3), and work efficiency of the recycling process has been improved.

JP-A-2005-26088 JP 2010-3512 A JP 2010-165568 A

  By the way, in the recycling method of patent documents 1-3, in order to heat-process a secondary battery, in the case of heat processing, the gas of a thermal decomposition product is discharged | emitted. It is desirable that the pyrolysis product is liquefied and recovered by a tank as waste liquid, and the gas that has not been liquefied is purified by a purification device as waste gas. However, conventionally, separation of waste liquid and waste gas is not taken into consideration, and part of the waste liquid may flow into the purification device, and the waste gas may flow into the tank, and efficiently recover and purify the waste liquid and waste gas. It was difficult.

  Then, an object of this invention is to provide the recycle processing apparatus of a secondary battery which can collect | recover efficiently the thermal decomposition product discharged | emitted in the case of heat processing as a waste liquid and waste gas.

  The secondary battery recycling apparatus of the present invention includes a heat treatment tank for heating a secondary battery, a cooling unit for cooling a thermal decomposition product discharged from the heated secondary battery, and the cooled thermal decomposition. A first flow path through which the product flows, a second flow path branched from the first flow path, a tank installed on the discharge side of the first flow path and storing the pyrolysis product, and the second A purification device that is disposed on the discharge side of the flow path and purifies the thermal decomposition product, and holds liquid in the first flow path between the branch position of the second flow path and the tank. A holding portion is provided, and the first flow path is blocked by the liquid in the holding portion.

  In the secondary battery recycling apparatus, it is preferable that the holding portion provided in the first flow path has a U-shaped flow path shape.

  ADVANTAGE OF THE INVENTION According to this invention, the thermal decomposition product discharged | emitted in the case of heat processing can be efficiently collect | recovered as a waste liquid and waste gas.

It is a schematic diagram which shows an example of a structure of the recycling processing apparatus of the secondary battery which concerns on this embodiment. It is a schematic diagram which shows another example of a structure of the recycling processing apparatus of the secondary battery which concerns on this embodiment. It is a flowchart for demonstrating the disassembly of a battery pack, and the collection process of valuables.

  Hereinafter, an example of a method and a processing apparatus for recycling a battery pack will be described with reference to the drawings. Here, the term “secondary battery” is not limited to a battery cell as a single battery such as a nickel hydride secondary battery or a lithium ion secondary battery, but a plurality of battery cells (for example, about six or eight batteries). ) A battery module connected in series as one component unit, or a battery pack configured by connecting a plurality of battery modules in series, or a control device for monitoring and controlling the battery pack and the charging state of the battery module, Electronic components such as relays for disconnecting electrical circuits, safety plugs for mechanically disconnecting circuits and cooling blowers for cooling assembled batteries, signal lines and power lines connecting each component, and airtight storage The battery pack etc. comprised from the case etc. which carry out are also included.

  FIG. 1 is a schematic diagram illustrating an example of a configuration of a secondary battery recycling apparatus according to the present embodiment. 1 includes a heat treatment tank 12, a replacement gas supply device 14, a cooling device 18, a waste liquid tank 20, a purification device 24, and pipes 22a, 22b, 22c, and 22d. In FIG. 1, the pipes 22 c and 22 d and the purification device 24 are shown in a sectional view.

  The heat treatment tank 12 is mainly for heat treatment of the secondary battery 10, and an electric heater 26 and a mounting table 28 on which the secondary battery 10 is placed in the heat treatment tank 12 of the present embodiment, Is provided. The heat source for heating the secondary battery 10 is not limited to the electric heater 26, and may be an indirect heating type gas heater such as a radiant tube.

  Examples of the replacement gas supply device 14 include a steam boiler such as a once-through boiler that generates water vapor (hereinafter simply referred to as steam), a gas cylinder filled with an inert gas, and the like.

  The cooling device 18 is mainly for cooling a thermal decomposition product and the like released from the secondary battery 10, and for example, an indirect water-cooled heat exchanger such as a shell and tube type, a plate fin type, or the like. A surface heat exchanger and the like can be mentioned.

  The waste liquid tank 20 is mainly used for storing the condensed thermal decomposition products that are cooled by the cooling device 18 and condensed and liquefied. The purification device 24 is for purifying gaseous thermal decomposition products that have not been condensed mainly by the cooling device 18.

  One end of the pipe 22 a is connected to the replacement gas supply device 14, and the other end of the pipe 22 a is connected to the supply pipe 12 a of the heat treatment tank 12. One end of the pipe 22b is connected to the discharge pipe 12b of the heat treatment tank 12, and the other end of the pipe 22b is connected to a supply port (not shown) of the cooling device 18. One end of the pipe (first flow path) 22c is connected to a discharge port (not shown) of the cooling device 18, and the other end of the pipe 22c is connected to a waste liquid inlet (not shown) of the waste liquid tank 20. One end of the pipe 22d (second flow path) is connected to a pipe 22c on the upstream side (hereinafter sometimes simply referred to as the upstream side) of the flow of the thermal decomposition product from the holding unit 30 described later. The other end is connected to a supply port (not shown) of the purification device 24.

  The pipe 22c is provided with a holding unit 30 that holds the liquid. The holding unit 30 is disposed on the pipe 22c on the downstream side of the flow of the pyrolysis product from the pipe 22d (hereinafter sometimes referred to simply as the downstream side), that is, between the branch position of the pipe 22d and the waste liquid tank 20. It arrange | positions at the piping 22c. The holding part 30 of the present embodiment has a U-shaped flow path shape. The liquid 30a is stored in the U-shaped part, and the flow path of the pipe 22c is blocked in the holding part 30. In the present embodiment, the pipe 22c on the downstream side of the U-shaped holding portion 30 is folded in a U shape so that the liquid 30a overflowed from the holding portion 30 flows into the waste liquid tank 20 as will be described later. It has become. In the present embodiment, pipes 22e and 22f for drawing the liquid 30a from the liquid surface and bottom surface of the liquid 30a stored in the holding unit 30 are connected to the pipe 22c.

  Next, the operation of the processing apparatus 1 according to this embodiment will be described.

  First, the door 12c of the heat treatment tank 12 is opened, the secondary battery 10 is set on the mounting table 28 in the tank, the door 12c is closed and sealed, the electric heater 26 is turned on, and the secondary battery 10 is turned on. Heat. The temperature control in the heat treatment tank 12 is performed by installing a temperature sensor (not shown) in the tank, detecting the temperature in the tank, and adjusting the output of the electric heater 26 based on the detected temperature. Is done.

  When the secondary battery 10 is heated in the heat treatment tank 12 and the temperature of the secondary battery 10 reaches or exceeds the boiling point of the electrolyte in the battery cell constituting the secondary battery 10, the pressure inside the battery cell increases. Thus, a thermal decomposition product such as an electrolytic solution is released as a gas from a safety valve or the like provided in the battery cell, and the voltage starts to fluctuate. If the heating is further continued, the voltage becomes zero and the battery function is destroyed. For example, in a lithium ion secondary battery using an organic electrolyte and a nickel metal hydride secondary battery using an aqueous electrolyte, the battery function of the secondary battery 10 is destroyed and the voltage is reduced to zero by heating at 150 ° C. or higher. It becomes possible to. Since the secondary battery 10 after such a heat treatment can be safely handled as zero-voltage scrap, it is possible to safely and easily perform disassembly of the secondary battery 10 as a post-process.

  In the heat treatment of the present embodiment, as shown in FIG. 1, a replacement gas such as water vapor or an inert gas is supplied from the replacement gas supply device 14 through the pipe 22a into the heat treatment tank 12, and the heat treatment tank It is preferable to replace the inner space 12 with a replacement gas such as water vapor or an inert gas to make it oxygen-free. For example, among electrolytes used for lithium ion secondary batteries, an organic electrolyte such as dimethyl carbonate is a flammable material, but the inside of the heat treatment tank 12 is replaced with a replacement gas to make an oxygen-free state. Even if the organic electrolyte is released from the secondary battery 10 by the heat treatment, combustion in the heat treatment tank 12 is suppressed and the organic electrolyte is discharged from the heat treatment tank 12. In particular, it is preferable to supply steam in the heat treatment. For example, an electrolyte salt such as lithium hexafluorophosphate used for an electrolyte of a lithium ion secondary battery is thermally decomposed and changed into lithium fluoride, hydrogen fluoride, or the like by heat treatment, but the vapor is heated. By supplying it into the treatment tank 12, hydrogen fluoride (gas) can be easily recovered as hydrofluoric acid.

Next, the gaseous thermal decomposition product released from the secondary battery 10 by the heat treatment is supplied to the cooling device 18 through the pipe 22b. Examples of the thermal decomposition product released from the secondary battery 10 include an electrolyte solution constituting the secondary battery 10 and a resin such as a separator. For example, in the case of a lithium ion secondary battery, a thermal decomposition product derived from an electrolyte such as dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), hydrogen fluoride, lithium fluoride, polyethylene, etc. A thermal decomposition product derived from a resin such as a separator made of (PE), polypropylene (PP) or the like is released as a gas. Also, when dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), polyethylene (PE), polypropylene (PP), etc. are released, from their constituent elements H, C, O, etc. Gases such as hydrogen (H ₂ ), carbon monoxide (CO), and carbon dioxide (CO ₂ ) are also generated, and these are also referred to as thermal decomposition products in this specification.

When these thermal decomposition products are supplied to the cooling device 18, the thermal decomposition products are cooled and liquefied. And the liquefied thermal decomposition product is discharged | emitted from the cooling device 18, and the gaseous thermal decomposition product which was not liquefied (condensed) by the cooling device 18 is also discharged | emitted. In the case of a lithium ion secondary battery, the liquefied thermal decomposition product is, for example, dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), hydrogen fluoride, lithium fluoride or the like. Electrolytic solution. Also, the gaseous heat decomposition products which has not condensed is hydrogen (H _2), carbon monoxide (CO), is a carbon dioxide (CO ₂₎ or the like, also includes the above electrolyte solution which could not be condensed There is a case.

  The liquefied pyrolysis product passes through the pipe 22 c and is stored in the holding unit 30. On the other hand, the gaseous pyrolysis product does not flow into the pipe 22c downstream of the holding unit 30 due to the liquid 30a in the holding unit 30, but is supplied to the purification device 24 through the pipe 22d branched from the pipe 22c. And purified there. As the purification device, for example, a gas adsorption filter filled with activated carbon or the like is used, and gaseous pyrolysis products are adsorbed on the activated carbon, and leakage of gaseous pyrolysis products outside the system is suppressed. . When the gaseous pyrolysis product is in an acidic atmosphere, it is preferable to use a gas adsorption filter or the like in which slaked lime (calcium hydroxide) 24b is filled in the previous stage of the activated carbon 24a as in the purification device 24 of the present embodiment. . According to such a purification device 24, the thermal decomposition product can be adsorbed to the activated carbon after neutralizing the gaseous thermal decomposition product in an acidic atmosphere.

  When the liquefied pyrolysis product is stored in the holding unit 30, the liquefied pyrolysis product having a high specific gravity flows downstream from the holding unit 30, overflows from the overflow port 31, and passes through the pipe 22c. It is supplied to the waste liquid tank 20 and collected as waste liquid. Further, if there is a liquefied thermal decomposition product having a low specific gravity, it remains on the upstream side of the holding unit 30 and is therefore discharged from the pipe 22e. Moreover, when the solid content is contained in the thermal decomposition product and it passes through the piping 22c and is stored in the holding part 30, it is discharged from the piping 22f. In addition, the liquid with which the holding unit is filled before the operation of the apparatus is not particularly limited, but is preferably a liquid with low volatility such as water.

  The waste liquid tank 20 is preferably provided with a gas adsorption filter 34 filled with a vent pipe 32 and activated carbon. When the waste liquid accumulates in the waste liquid tank 20, the pressure in the waste liquid tank 20 may become higher than the atmospheric pressure. When the pressure in the waste liquid tank 20 becomes higher than the atmospheric pressure, the gas is discharged from the vent pipe 32 installed in the waste liquid tank 20 to the atmosphere. At this time, since the gas is discharged into the atmosphere through the gas adsorption filter 34, it is possible to prevent odors and the like from leaking outside the apparatus.

  Thus, by installing the holding unit 30 described above in the pipe 22c, the liquefied pyrolysis product is sent to the waste liquid tank 20, and the gaseous pyrolysis product that has not been liquefied is sent to the purification device 24. , Waste liquid and waste gas can be separated and recovered efficiently.

  Conventionally, gaseous pyrolysis products that have not been liquefied also flow into the waste liquid tank together with the liquefied pyrolysis products, so the gaseous pyrolysis products that accumulate in the waste liquid tank are gas adsorption filters installed in the waste liquid tank. It was purifying by. Therefore, conventionally, it has been necessary to increase the volume of the waste liquid tank on the assumption that a gaseous thermal decomposition product flows. However, in this embodiment, the liquefied pyrolysis product is distributed to the waste liquid tank 20, the gaseous pyrolysis product is distributed to the purification device 24, and the gaseous pyrolysis product is difficult to flow into the waste liquid tank 20, The volume of the waste liquid tank 20 can be made compact. Further, flammable gas such as hydrogen gas can also be directly purified by the purification device 24 without accumulating in the waste liquid tank 20.

  FIG. 2 is a schematic diagram illustrating another example of the configuration of the secondary battery recycling apparatus according to the present embodiment. In the secondary battery recycling apparatus 2 shown in FIG. 2, the same components as those in the recycling apparatus 1 shown in FIG. The holding unit of the secondary battery recycling apparatus 2 in FIG. 2 includes a storage unit 36 for storing liquid and a valve 38.

  Prior to the operation of the apparatus, the storage portion 36 is filled with the liquid 30a from the piping 22e or the like, and the flow path of the piping 22c is blocked by the liquid in the holding portion (substantially the storage portion 36). At this time, all or a part of the space in the reservoir 36 is filled with the liquid 30a. After the operation of the apparatus, as described above, the thermal decomposition product liquefied by the cooling device 18 passes through the pipe 22c and is stored in the storage unit 36 of the holding unit, and the gaseous thermal decomposition product is stored in the storage unit 36. The liquid does not flow into the pipe 22c on the downstream side of the holding portion, passes through the pipe 22d branched from the pipe 22c, is supplied to the purification device 24, and is purified.

  On the other hand, the liquefied pyrolysis product is stored in the storage unit 36 of the holding unit. Then, after a predetermined time has elapsed since the operation of the apparatus, or when the liquid level in the storage unit 36 has exceeded a predetermined water level, the valve 38 is opened, and a part of the liquid 30a in the storage unit 36 is drained through the pipe 22c. Supply to tank 20. If the liquid 30a in the storage unit 36 is completely discharged, the gaseous thermal decomposition product also flows into the waste liquid tank 20, so that a certain amount of the liquid 30a needs to remain in the storage unit 36. is there.

  The structure of the holding part is not limited to the structure of the holding part shown in FIGS. 1 and 2 as long as the liquid can be held in the pipe 22c and the flow path in the pipe 22c can be blocked by the liquid. However, from the viewpoint of simplification of the device configuration, miniaturization, ease of operation management, etc., the holding unit has a U-shaped piping structure shown in FIG. 1 and is filled (held) with liquid. It is preferable to block the flow path of the pipe 22c.

  The secondary battery in which the battery function is destroyed and the electrolytic solution is released by the heat treatment as described above is transported to the secondary battery disassembly and valuable material recovery process. In particular, even in the case of a battery pack composed of electronic parts, signal lines, power lines, cases, etc. together with battery cells, the battery function is destroyed and the electrolyte solution is released. The entire process from dismantling to collection of valuable materials can be automated without requiring dangerous manual work (battery pack dismantling work) by the operator. As a result, a safe and inexpensive secondary battery can be recycled.

  FIG. 3 is a flowchart for explaining the dismantling of the battery pack and the recovery process of the valuables. Here, a battery pack of a lithium ion secondary battery will be described as an example, but the same can be applied to a battery pack of a nickel hydride secondary battery. In addition, the recovery process of valuable materials described below mainly includes an electrode foil (Al, Cu) used as a current collector of a lithium ion secondary battery, and a transition metal (Ni, Mn, used as a positive electrode material). Co, etc.), and recovers lithium present in the positive electrode material and the negative electrode material. Further, the flow shown in FIG. 3 is an example of a process of disassembling the battery pack and collecting valuables, and is not limited thereto.

  As shown in FIG. 3, in step S10, the battery pack that has been subjected to the heat treatment described above is crushed. When the battery pack is heat-treated, the thermoplastic resin, which is a constituent material of the battery pack, is thermally decomposed to be in a state significantly different from the original, but the battery cell electrolyte is released to the outside and the battery function is Because it is in a safe state of being destroyed, in the crushing process, it is better to throw the battery pack directly into a shredder machine (such as a large hammer mill) and perform the crushing process instead of manual dismantling by the operator. This is preferable. Moreover, before crushing a battery pack with a shredder machine etc., you may perform the process of immersing a battery pack in water and discharging a battery cell. In addition, this shredder machine etc. can use what is generally used in a process of a scrap car and a waste home appliance.

  By crushing the battery pack using a shredder machine, non-priced materials such as resin are discharged as shredder dust. On the other hand, among the battery cells in the battery pack, an aluminum case or the like that is an exterior of the battery cell becomes a metal piece with a large specific gravity, and an electrode foil (including a positive electrode material and a negative electrode material) becomes a metal scrap with a small specific gravity. . Shredder dust is disposed of in a landfill according to the disposal law. Moreover, as a condition for landfill, it is necessary to satisfy the management-type landfill standard.

  Next, in step S12, the above-described metal piece having a large specific gravity and metal scrap having a small specific gravity are subjected to wind sorting, and the metal piece having a large specific gravity is collected. Instead of wind sorting, metal pieces having a large specific gravity may be recovered by magnetic sorting.

Next, in step S14, metal waste having a small specific gravity such as an electrode foil (including a positive electrode material and a negative electrode material) is washed with water to convert lithium in the negative electrode material and lithium in the positive electrode material into lithium hydroxide. The transition metal in the material is changed to a hydroxide. The reaction when lithium nickelate is used as the positive electrode material is shown below.
3LiNiO ₂ + 4.5H ₂ O → 3LiOH + 3Ni (OH) ₂ + 4 / 3O ₂

Lithium hydroxide easily dissolves in water to form an aqueous solution, and transition metal hydroxides such as nickel hydroxide have very low solubility in water, and thus hardly dissolve and become solids. The solubility of nickel hydroxide is 0.0013 g / 100 cm ³ .

  Next, in step S16, the aqueous solution such as lithium hydroxide and the solid content such as nickel hydroxide are sieved by the vibration sieve device or the like. In step S18, carbon dioxide gas is introduced into the aqueous lithium hydroxide solution to neutralize it to obtain lithium carbonate, which is recovered by precipitation filtration.

  In step S20, solid content such as transition metal hydroxide such as nickel hydroxide is put into the leaching tank, and acid such as hydrochloric acid is added to change the transition metal hydroxide into water-soluble metal chloride. Let A metal chloride solution such as nickel chloride is extracted, and the process proceeds to step S30 described later, and is recycled into a product such as metal or nickel sulfate as a nickel raw material by an existing refining process.

  When hydrochloric acid is added (step S20), in the leaching tank, unreacted metal hydroxide such as nickel hydroxide (positive electrode material), separator, and aluminum (electrode foil) are levitated, and the negative electrode material (carbon) and Since copper (electrode foil) settles, these can be separated. In the following description, the levitated material that has floated in the leaching tank is referred to as a floating electrode material, and the sediment that has settled in the leaching tank is referred to as a sediment electrode material. In step S20, when sulfuric acid is added instead of hydrochloric acid, unreacted metal hydroxide such as nickel hydroxide, separator, aluminum (electrode foil), negative electrode material (carbon) and copper (electrode foil) are all precipitated. Resulting in. The reason why it is possible to separate the floating electrode material and the sedimented electrode material by adding hydrochloric acid is that it occurs in the process of corroding aluminum when hydrochloric acid is added in addition to the difference in specific gravity between copper and aluminum. This is considered to be because the apparent specific gravity of aluminum is lower than 1 because the generation rate of hydrogen gas is higher than when sulfuric acid is added. Therefore, in the subsequent copper recovery, it is preferable to add hydrochloric acid in terms of increasing the purity of copper and increasing the added value as a recycled material. Even when sulfuric acid is added, valuable metals such as Ni can be recovered in the subsequent steps.

  Next, in step S22, the floating electrode material separated from the leaching tank is put into the cleaning tank, and hydrochloric acid is added and stirred and washed. Thereby, the transition metal hydroxide such as nickel hydroxide attached to the aluminum or the separator is changed to a water-soluble metal chloride. And in step S24, it sifts into solid content, such as aluminum and a separator, and metal chloride solutions, such as nickel chloride, with a vibration sieve apparatus. The sieved aluminum or separator may be collected as a recycled material or discarded. On the other hand, the metal chloride solution such as nickel chloride proceeds to step S30 and is refined by an existing refining process, and is recycled, for example, to a product such as metal or nickel sulfate as a nickel raw material.

  In step S26, the sedimentation electrode material separated from the leaching tank is put into the washing tank in the same manner as described above, and hydrochloric acid is added and washed with stirring. Thereby, the hydroxide of transition metals, such as nickel hydroxide, adhering to copper is changed into a water-soluble metal chloride. And in step S28, it sifts into solid content, such as copper, and metal chloride solutions, such as nickel chloride, with a vibration sieve apparatus. The sieved copper is recovered as recycled material. On the other hand, the metal chloride solution such as nickel chloride proceeds to step S30 in the same manner as described above, and is refined by an existing refining process. For example, it is recycled as a nickel raw material into a product such as metal or nickel sulfate.

  1, 2 Recycle treatment device, 10 Secondary battery, 12 Heat treatment tank, 12a Supply pipe, 12b Discharge pipe, 12c Open / close door, 14 Replacement gas supply device, 18 Cooling device, 20 Waste liquid tank, 22a-22f Piping, 24 Purification Apparatus, 24a Activated carbon, 24b Slaked lime, 26 Electric heater, 28 Mounting table, 30 Holding part, 30a Liquid, 31 Overflow port, 32 Vent pipe, 34 Gas adsorption filter, 36 Storage part, 38 Valve.

Claims (2)

A heat treatment tank for heating the secondary battery;
A cooling device for cooling the thermal decomposition product discharged from the heated secondary battery;
A first flow path through which the cooled pyrolysis product flows and a second flow path branched from the first flow path;
A tank installed on the discharge side of the first flow path and storing the thermal decomposition product;
A purification device installed on the discharge side of the second flow path and purifying the thermal decomposition product,
The first flow path between the branch position of the second flow path and the tank is provided with a holding unit that holds liquid, and the holding unit closes the first flow path with the liquid. A rechargeable battery recycling device.   The secondary battery recycling apparatus according to claim 1, wherein the holding portion provided in the first flow path has a U-shaped flow path shape.

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