Waste lithium ion battery discharging device and method combined with recycled carbon

Abstract

The invention discloses a waste lithium ion battery discharging device and method combined with carbon recovery, and relates to the technical field of battery recovery, the waste lithium ion battery discharging device comprises a plurality of battery containers, a leachate storage pool, a filtering structure, a discharging waste liquid treatment pool, a transportation slide rail and a control module, by comprehensively utilizing the recycled carbon generated in the waste battery recycling process and the scrap iron generated in industrial production, the discharge depth of the waste lithium ion battery is enhanced, the discharge time of the waste lithium ion battery is shortened, and organic pollutants in the wastewater are degraded through a micro-electrolysis reaction and a Fenton reaction between iron and carbon. According to the battery discharging method provided by the invention, carbon and scrap iron recovered from the lithium ion battery recovery product are combined with the salt solution for use, so that the discharging efficiency is improved, the discharged salt solution is low in pollution and can be repeatedly used, and the battery discharging method has the characteristics of low cost, low pollution, convenience in recovery and small environmental pollution; and the intermittent ultrasonic oscillation and ultrasonic dispersion method can effectively improve the discharge efficiency of the waste lithium ion battery.

Description

Technical Field

[0001] The invention relates to the technical field of battery recycling, and in particular to a low-pollution discharge method for waste lithium-ion batteries combined with recycled carbon. Background Art

[0002] As an excellent battery with high energy per unit volume, low self-discharge rate and high conversion efficiency, lithium-ion batteries are widely used in new energy vehicles, digital products, energy storage power stations and other fields around the world. The above situation has promoted the rapid development of the lithium-ion battery industry. At the same time, due to the limited cycle life of lithium-ion batteries, people are forced to face the increasingly prominent problem of recycling retired lithium-ion batteries. The proven reserves of lithium, nickel, cobalt and other metal elements contained in lithium-ion batteries are relatively low in my country, and the types of chemical substances inside the battery are complex, which poses certain safety risks. Therefore, retired lithium-ion batteries have both high resource value and high environmental and safety risks.

[0003] In the current recycling field of waste lithium-ion batteries, discharging waste lithium-ion batteries is one of the key steps. Since waste lithium-ion batteries still contain residual electrical energy, if they are not discharged, there is a risk of fire or even explosion in the subsequent recycling process. The current discharge methods of waste lithium-ion batteries are mainly divided into physical discharge method, chemical discharge method and puncture discharge method, which correspond to conductive powder or electronic load discharge, salt solution discharge and battery internal short circuit discharge respectively. Among them, the physical discharge method has a low environmental impact, but it is difficult to discharge completely, and there is a dust problem, which is not suitable for large-scale production; the chemical discharge method has a relatively mild discharge process, but the discharge time is long, and the chemical oxygen demand of the salt solution after discharge is high, and the direct discharge of wastewater will seriously pollute the ecological environment; the puncture discharge method discharges quickly, but the discharge process needs to be carried out in an oxygen-deficient environment, and there are safety hazards and high implementation costs. Therefore, there is still room for further improvement in the existing waste lithium-ion battery discharge method. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention provides a low-pollution discharge method for waste lithium-ion batteries combined with carbon recovery, by recovering carbon from one of the lithium-ion battery recovery products and using it in combination with iron filings and salt solution, while improving the discharge efficiency, the salt solution after discharge has low pollution, low processing cost, and can be repeatedly used.

[0005] The present invention provides a waste lithium-ion battery discharge device and method combined with carbon recovery (referred to as device and method), the device mainly consists of a plurality of battery containers, a leachate storage tank, a filtering structure, a discharge waste liquid treatment tank, a transport slide rail, and a control module;

[0006] Characterized in that a shock-absorbing and sound-insulating base is installed at the bottom of the battery container;

[0007] Furthermore, a container lifting device is installed in the shock-absorbing and sound-insulating base, which can realize the lifting and tilting of the battery container;

[0008] A hydraulic device is installed on the side of the battery container to support the battery container, so as to achieve the lifting and tilting of the battery container;

[0009] Furthermore, a rotating structure is installed on the top of the hydraulic device, which can flexibly select the angle as the hydraulic device rises and falls;

[0010] An ultrasonic generator is installed at the bottom of the battery container to generate ultrasonic waves;

[0011] An ultrasonic dispersion probe is provided on the upper portion of the battery container;

[0012] Furthermore, the upper part of the ultrasonic dispersion probe is provided with a telescopic device, which can control the height of the ultrasonic dispersion probe.

[0013] Furthermore, the ultrasonic dispersion probe is fixedly connected between the telescopic device as a whole;

[0014] Furthermore, the telescopic device is installed on the transport slide rail, and the telescopic device can move along the transport slide rail;

[0015] Furthermore, the telescopic device can be moved to a position outside the battery container when it moves on the transport slide rail;

[0016] The solid material transport conveyor belt is responsible for transporting waste lithium-ion batteries and recovering carbon, iron filings and other solid materials required for discharge;

[0017] The liquid injection hole is used to inject saline solution or other liquids such as cleaning agent into the battery container;

[0018] The leachate storage tank is responsible for storing solids other than liquid batteries poured out of the battery container;

[0019] Furthermore, a discharged battery conveyor belt is installed on the upper part of the leachate storage tank, and the discharged battery conveyor belt is responsible for conveying the discharged batteries;

[0020] Furthermore, a spray port for waste liquid after leaching of electrode materials is installed on the upper part of the discharged battery conveyor belt, and the spray port for waste liquid after leaching of electrode materials can spray the waste liquid after leaching of electrode materials onto the discharged battery conveyor belt to rinse the discharged batteries;

[0021] Furthermore, the bottom of the leachate storage tank is provided with a sewage outlet, which can be used to discharge the sludge in the leachate storage tank;

[0022] Furthermore, one side of the leachate storage tank is a filter structure and a clear liquid tank, and the filter structure can filter out solid matter from the liquid in the leachate storage tank to the clear liquid tank;

[0023] Furthermore, the bottom of the clear liquid tank is connected to a mixed liquid return pipeline;

[0024] Furthermore, the bottom of the clear liquid tank is connected to a discharge waste liquid treatment tank;

[0025] Furthermore, the connection between the clear liquid tank and the mixed liquid return pipeline and the discharge waste liquid treatment tank is switched by a three-way valve;

[0026] The control module can realize the control of lifting and tilting of the battery container;

[0027] The control module can realize the control of the movement and lifting of the telescopic device;

[0028] The present invention provides a low-pollution discharge method for waste lithium-ion batteries combined with carbon recovery, comprising the following steps:

[0029] Step (1) placing a number of waste lithium-ion batteries with positive and negative electrodes exposed on a number of battery racks or in battery containers;

[0030] Step (2) placing the plurality of battery racks into a battery container, and injecting recycled carbon and iron filings into the battery container;

[0031] Step (3) injecting a saline solution into the battery container;

[0032] By volume, the recovered carbon is 0.1 to 10 parts, the iron filings are 0.1 to 10 parts, and the salt solution is 80 to 99.8 parts;

[0033] Step (4) The recovered carbon, iron filings, and salt solution in the battery container are mixed uniformly by ultrasonic oscillation and ultrasonic dispersion, and step S4 is repeated at regular intervals, and the time interval is gradually extended;

[0034] Step (5) After the discharge is completed, the battery rack and the batteries in the battery container are taken out to obtain a number of batteries that have completed discharge;

[0035] Step (6) adding the waste liquid after the electrode material is leached to the discharged solution in the battery container from which the battery rack and the battery are removed;

[0036] The waste liquid after leaching of the electrode material is 3 to 50 parts by volume;

[0037] Step (7) 1: mixing the materials in the battery container by ultrasonic vibration and ultrasonic dispersion, filtering out the solidified materials from the liquid in the battery container, and transferring the solidified materials to a discharge waste liquid treatment tank;

[0038] Step (8) adding hydrogen peroxide solution into the discharge waste liquid treatment pool;

[0039] By volume, if a 30% hydrogen peroxide solution is used, the hydrogen peroxide solution is 0.1 to 20 parts;

[0040] Specifically, the recycled carbon is a carbon product produced after filtering out various metals during the battery recycling process;

[0041] Specifically, the salt solution is a ferrous sulfate solution, and the salt solution contains 5 to 20 parts of ferrous sulfate by weight;

[0042] Specifically, the battery rack and the battery container have high corrosion resistance at the contact points with the salt solution;

[0043] Specifically, in step 4, the waste gas generated during the discharge process is collected;

[0044] Specifically, in step 4, the ultrasonic frequency of ultrasonic oscillation and ultrasonic dispersion is 20kHz to 100kHz;

[0045] Specifically, in step 4, the time of ultrasonic oscillation and ultrasonic dispersion is 15 to 40 minutes;

[0046] Specifically, in step 4, the time interval between ultrasonic oscillation and ultrasonic dispersion is 40 to 120 minutes;

[0047] Specifically, in step 6, the waste liquid after leaching of the electrode material is the waste liquid obtained after extracting various metals in the electrode material;

[0048] Specifically, in step 7, the time of ultrasonic oscillation and ultrasonic dispersion is 15 to 40 minutes;

[0049] Specifically, after the salt solution is added to the battery container, the temperature in the battery container should be controlled at 50 to 55 degrees Celsius before the liquid in the battery container is transferred to the discharge waste liquid treatment tank;

[0050] Specifically, during the discharge process, when the battery voltage drops to 2.5V or below, the discharge is considered complete.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The salt solution selected by the present invention has the advantages of low cost, non-volatility, non-flammability, high heat resistance, less waste gas generated during the discharge process, low waste gas pollution and easy treatment, strong conductivity, stable properties, etc., and through comprehensive utilization of recycled carbon generated in the waste battery recycling process and waste iron scraps generated in industrial production, the discharge depth of the waste lithium ion battery is enhanced, the discharge time of the waste lithium ion battery is shortened, and a part of the macromolecular organic matter in the waste water is degraded in advance through the micro-electrolysis reaction between iron and carbon, thereby reducing the difficulty of subsequent waste water treatment; and then, by adding the waste liquid after the electrode material is leached and the hydrogen peroxide solution to the waste liquid after discharge, the Fenton reaction is regulated through the waste liquid after the electrode material is leached, and the degradation effect of organic pollutants in the waste water is improved.

[0053] The battery discharging method proposed by the present invention comprehensively utilizes low-value products and wastewater generated in the process of recycling waste batteries, and has the characteristics of low cost, low pollution, easy recycling and little environmental pollution.

[0054] The intermittent ultrasonic oscillation and ultrasonic dispersion method proposed in the present invention can effectively improve the discharge efficiency of waste lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 The figure is a flow chart of the method of the present invention.

[0056] Figure 2 It is a simplified diagram of the structure of the device of the present invention.

[0057] Explanation of the reference numerals: battery container 1, shock-absorbing and sound-insulating base 11, container lifting device 12, hydraulic device 13, ultrasonic generator 14, ultrasonic dispersion probe 15, telescopic device 16, solid transport conveyor belt 17, injection hole 18, rotating structure 131, leachate storage tank 2, filtration structure 21, clear liquid tank 22, sewage outlet 23, mixed liquid return pipeline 24, battery conveyor belt after discharge 25, waste liquid spray port after electrode material leaching 26, three-way valve 27, discharge waste liquid treatment tank 3, transport slide rail 4, control module 5. DETAILED DESCRIPTION

[0058] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0059] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be connected through an intermediate medium, or it can be an internal connection between two components. For ordinary technicians in this technical field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] like Figure 1 and Figure 2 As shown, the present invention provides a waste lithium-ion battery discharge device and method combined with carbon recovery (referred to as device and method), the device mainly consists of a plurality of battery containers 1, a leachate storage tank 2, a filter structure 21, a discharge waste liquid treatment tank 3, a transport slide rail 4, and a control module 5;

[0062] It is characterized in that a shock-absorbing and sound-insulating base 11 is installed at the bottom of the battery container 1;

[0063] Furthermore, a container lifting device 12 is installed in the shock-absorbing and sound-insulating base 11, which can realize the lifting and tilting of the battery container 1;

[0064] A hydraulic device 13 is installed on the side of the battery container 1 to support the battery container 1 and realize the lifting and tilting of the battery container 1;

[0065] Furthermore, a rotating structure 131 is installed at the top of the hydraulic device 13, and the angle can be flexibly selected as the hydraulic device 13 is raised or lowered;

[0066] An ultrasonic generator 14 is installed at the bottom of the battery container 1 to generate ultrasonic waves;

[0067] An ultrasonic dispersion probe 15 is provided on the upper portion of the battery container 1;

[0068] Furthermore, the upper part of the ultrasonic dispersion probe 15 is provided with a telescopic device 16, which can control the height of the ultrasonic dispersion probe 15;

[0069] Furthermore, the ultrasonic dispersion probe 15 is fixedly connected between the telescopic device 16 as a whole;

[0070] Furthermore, the telescopic device 16 is installed on the transport slide rail 4, and the telescopic device 16 can move along the transport slide rail 4;

[0071] Furthermore, the telescopic device 16 can be moved to a position outside of the battery container 1 when it moves on the transport slide rail 4;

[0072] The solid material transport conveyor belt 17 is responsible for transporting waste lithium-ion batteries and recovering carbon, iron filings and other solid materials required for discharge;

[0073] The injection hole 18 is used to inject saline solution or other liquids such as cleaning agent into the battery container 1;

[0074] The leachate storage tank 2 is responsible for storing solids other than liquid batteries poured out of the battery container 1;

[0075] Furthermore, a discharged battery conveyor belt 25 is installed on the upper part of the leachate storage tank 2, and the discharged battery conveyor belt 25 is responsible for conveying the discharged batteries;

[0076] Furthermore, a post-discharge battery conveyor belt 25 is provided with a post-electrode material leached waste liquid spray port 26, and the post-discharge battery conveyor belt 25 can spray the post-discharge battery leached waste liquid onto the post-discharge battery conveyor belt 25 to rinse the post-discharge battery.

[0077] Furthermore, the bottom of the leachate storage tank 2 is provided with a sewage outlet 23, which can be used to discharge the sludge in the leachate storage tank 2;

[0078] Furthermore, one side of the leachate storage tank 2 is a filter structure 21 and a clear liquid tank 22, and the filter structure 21 can filter out solid matter from the liquid in the leachate storage tank 2 to the clear liquid tank 22;

[0079] Furthermore, the bottom of the clear liquid tank 22 is connected to a mixed liquid return pipeline 24;

[0080] Furthermore, the bottom of the clear liquid tank 22 is connected to the discharge waste liquid treatment tank 3;

[0081] Further, the connection between the clear liquid tank 22 and the mixed liquid return pipeline 24 and the discharge waste liquid treatment tank 3 is switched by a three-way valve 27;

[0082] The control module 5 can realize the control of lifting and tilting of the battery container 1;

[0083] The control module 5 can realize the control of the movement and lifting of the telescopic device 16;

[0084] The present invention provides a low-pollution discharge method for waste lithium-ion batteries combined with carbon recovery, comprising the following steps:

[0085] Step (1) placing a number of waste lithium-ion batteries with positive and negative electrodes exposed on a number of battery racks or in battery containers;

[0086] Step (2) placing the plurality of battery racks into a battery container, and injecting recycled carbon and iron filings into the battery container;

[0087] Step (3) injecting a saline solution into the battery container;

[0088] By volume, the recovered carbon is 0.1 to 10 parts, the iron filings are 0.1 to 10 parts, and the salt solution is 80 to 99.8 parts;

[0089] Step (4) The recovered carbon, iron filings, and salt solution in the battery container are mixed uniformly by ultrasonic oscillation and ultrasonic dispersion, and step S4 is repeated at regular intervals, and the time interval is gradually extended;

[0090] Step (5) After the discharge is completed, the battery rack and the batteries in the battery container are taken out to obtain a number of batteries that have completed discharge;

[0091] Step (6) adding the waste liquid after the electrode material is leached to the discharged solution in the battery container from which the battery rack and the battery are removed;

[0092] The waste liquid after leaching of the electrode material is 3 to 50 parts by volume;

[0093] Step (7) mixing the materials in the battery container by ultrasonic vibration and ultrasonic dispersion, filtering out the solidified materials from the liquid in the battery container, and transferring the solidified materials to a discharge waste liquid treatment pool;

[0094] Step (8) adding hydrogen peroxide solution into the discharge waste liquid treatment pool;

[0095] By volume, if a 30% hydrogen peroxide solution is used, the hydrogen peroxide solution is 0.1 to 20 parts;

[0096] Specifically, the recycled carbon is a carbon product produced after filtering out various metals during the battery recycling process;

[0097] Specifically, the salt solution is a ferrous sulfate solution, and the salt solution contains 5 to 20 parts of ferrous sulfate by weight;

[0098] Specifically, the battery rack and the battery container have high corrosion resistance at the contact points with the salt solution;

[0099] Specifically, in step 4, the waste gas generated during the discharge process is collected;

[0100] Specifically, in step 4, the ultrasonic frequency of the ultrasonic oscillation and ultrasonic dispersion is 20KHz to 100KHz;

[0101] Specifically, in step 4, the time of ultrasonic oscillation and ultrasonic dispersion is 15 to 40 minutes;

[0102] Specifically, in step 4, the time interval between ultrasonic oscillation and ultrasonic dispersion is 40 to 120 minutes;

[0103] Specifically, in step 6, the waste liquid after leaching of the electrode material is the waste liquid obtained after extracting various metals in the electrode material;

[0104] Specifically, in step 7, the time of ultrasonic oscillation and ultrasonic dispersion is 15 to 40 minutes;

[0105] Specifically, after the salt solution is added to the battery container, the temperature in the battery container should be controlled at 50 to 55 degrees Celsius before the liquid in the battery container is transferred to the discharge waste liquid treatment tank;

[0106] Specifically, during the discharge process, when the battery voltage drops to 2.5V or below, the discharge is considered complete;

[0107] The present invention is applicable to the prior art where described.

Claims

1. The present invention provides a waste lithium-ion battery discharge device and method combined with carbon recovery, characterized in that: It includes several battery containers, leachate storage tanks, filtration structures, discharge waste liquid treatment tanks, transport slide rails, and control modules; A shock-absorbing and sound-insulating base 11 is installed at the bottom of the battery container 1; A container lifting device 12 is installed in the shock-absorbing and sound-insulating base 11, which can realize the lifting and tilting of the battery container 1; A hydraulic device 13 is installed on the side of the battery container 1 to support the battery container 1 and realize the lifting and tilting of the battery container 1; The top of the hydraulic device 13 is provided with a rotating structure 131, which can flexibly select an angle as the hydraulic device 13 is raised or lowered; An ultrasonic generator 14 is installed at the bottom of the battery container 1 to generate ultrasonic waves; An ultrasonic dispersion probe 15 is provided on the upper portion of the battery container 1; The upper part of the ultrasonic dispersion probe 15 is provided with a telescopic device 16, which can control the height of the ultrasonic dispersion probe 15; The ultrasonic dispersion probe 15 is fixedly connected between the telescopic device 16 as a whole; The telescopic device 16 is installed on the transport slide rail 4, and the telescopic device 16 can move along the transport slide rail 4; The telescopic device 16 can be moved to a position outside the battery container 1 when it moves on the transport slide rail 4; The solid material transport conveyor belt 17 is responsible for transporting waste lithium-ion batteries and recovering carbon, iron filings and other solid materials required for discharge; The injection hole 18 is used to inject saline solution or other liquids such as cleaning agent into the battery container 1; The leachate storage tank 2 is responsible for storing solids other than liquid batteries poured out of the battery container 1; A discharged battery conveyor belt 25 is installed on the upper part of the leachate storage tank 2, and the discharged battery conveyor belt 25 is responsible for conveying the discharged batteries; The upper part of the discharged battery conveyor belt 25 is provided with a spray port 26 for waste liquid after electrode material leaching, and the spray port 26 for waste liquid after electrode material leaching can spray the waste liquid after electrode material leaching onto the discharged battery conveyor belt 25 to rinse the discharged battery; The bottom of the leachate storage tank 2 is provided with a sewage outlet 23, which can be used to discharge the sludge in the leachate storage tank 2; One side of the leachate storage tank 2 is a filter structure 21 and a clear liquid tank 22. The filter structure 21 can filter out solid matter from the liquid in the leachate storage tank 2 and transfer it to the clear liquid tank 22. The bottom of the clear liquid tank 22 is connected to a mixed liquid return pipeline 24; The bottom of the clear liquid tank 22 is connected to the discharge waste liquid treatment tank 3; The connection between the clear liquid tank 22 and the mixed liquid return pipeline 24 and the discharge waste liquid treatment tank 3 is switched by a three-way valve 27; The control module 5 can realize the control of lifting and tilting of the battery container 1; The control module 5 can realize the control of the movement and lifting of the telescopic device 16.

2. A waste lithium-ion battery discharge device and method combined with carbon recovery according to claim 1, characterized in that: The following steps are involved: Step (1) placing a number of waste lithium-ion batteries with positive and negative electrodes exposed on a number of battery racks or in battery containers; Step (2) placing the plurality of battery racks into a battery container, and injecting recycled carbon and iron filings into the battery container; Step (3) injecting a saline solution into the battery container; By volume, the recovered carbon is 0.1 to 70 parts, the iron filings are 0.1 to 70 parts, and the salt solution is 30 to 99.8 parts; Step (4) The recovered carbon, iron filings, and salt solution in the battery container are mixed uniformly by ultrasonic oscillation and ultrasonic dispersion, and step S4 is repeated at regular intervals, and the time interval is gradually extended; Step (5) After the discharge is completed, the battery rack and the batteries in the battery container are taken out to obtain a number of batteries that have completed discharge; Step (6) adding the waste liquid after the electrode material is leached to the discharged solution in the battery container from which the battery rack and the battery are removed; Step (7) mixing the materials in the battery container by ultrasonic vibration and ultrasonic dispersion, filtering out the solidified materials from the liquid in the battery container, and transferring the solidified materials to a discharge waste liquid treatment pool; Step (8) adding hydrogen peroxide solution into the discharge waste liquid treatment pool.

3. The device and method for discharging waste lithium-ion batteries combined with carbon recovery according to claims 1 and 2, characterized in that: The waste liquid after the electrode material is leached is 3 to 50 parts by volume.

4. The device and method for discharging waste lithium-ion batteries combined with carbon recovery according to claims 1 and 2, characterized in that: By volume, if a 30% hydrogen peroxide aqueous solution is used, the hydrogen peroxide solution is 0.1 to 20 parts.

5. The device and method for discharging waste lithium-ion batteries combined with carbon recovery according to claims 1 and 2, characterized in that: The salt solution is a ferrous sulfate solution, and the salt solution contains 5 to 20 parts of ferrous sulfate by weight.

6. The device and method for discharging waste lithium-ion batteries combined with carbon recovery according to claims 1 and 2, characterized in that: The recycled carbon is the carbon product produced after filtering out various metals during the battery recycling process; The battery rack and the battery container have high corrosion resistance at the places where they come into contact with the salt solution.

7. The device and method for discharging waste lithium-ion batteries combined with carbon recovery according to claims 1 and 2, characterized in that: In the step (4), the time of ultrasonic oscillation and ultrasonic dispersion is 15 to 40 minutes; The time interval between ultrasonic oscillation and ultrasonic dispersion is 40 to 120 minutes.

8. The device and method for discharging waste lithium-ion batteries combined with carbon recovery according to claims 1 and 2, characterized in that: In the step (6), the waste liquid after the electrode material is leached is the waste liquid obtained after all kinds of metals in the electrode material are extracted.

9. The device and method for discharging waste lithium-ion batteries combined with carbon recovery according to claims 1 and 2, characterized in that: In the step (7), the time of ultrasonic oscillation and ultrasonic dispersion is 15 to 40 minutes.

10. The device and method for discharging waste lithium-ion batteries combined with carbon recovery according to claims 1 and 2, characterized in that: After the salt solution is added to the battery container, the temperature in the battery container should be controlled at 50 to 55 degrees Celsius before the liquid in the battery container is transferred to the discharge waste liquid treatment tank.

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