Grinding device for extracting lithium from lithium battery and equipment for extracting lithium from lithium battery

Abstract

The utility model relates to the field of lithium extraction of lithium batteries, in particular to a grinding device for lithium extraction of a lithium battery and lithium extraction equipment for the lithium battery. A containing cavity, a feeding port, a water inlet, a lithium liquid outlet and a discharging port are formed in the containing body, wherein the feeding port, the water inlet, the lithium liquid outlet and the discharging port are communicated with the containing cavity. And the grinding piece is arranged in the containing cavity in a relative movement mode, a grinding channel is formed between the outer wall of the grinding piece and the inner wall of the containing cavity, and grinding of the crushed lithium battery materials is achieved through relative movement. At least one of the inner peripheral wall of the accommodating body and the outer peripheral wall of the grinding piece is provided with one or more piezoelectric parts; and when the piezoelectric parts are rubbed by water and crushed materials of the lithium battery, charge movement for promoting precipitation of lithium elements is formed. According to the grinding device for lithium extraction of the lithium battery and the lithium extraction equipment for the lithium battery, the lithium extraction recovery rate is high, the lithium extraction cost is low, and the environment is difficult to pollute during lithium extraction.

Description

Technical Field

[0001] This disclosure relates to the field of lithium extraction technology for lithium batteries, and in particular to grinding apparatus and lithium extraction equipment for lithium batteries. Background Technology

[0002] With the increasing global demand for clean energy, lithium batteries, thanks to their superior performance, are widely used in many fields such as new energy vehicles and distributed energy storage. This widespread use has led to a continuous increase in the number of retired lithium batteries, making the recycling and disposal of used lithium batteries an important research area.

[0003] Lithium-ion batteries typically consist of a casing, a lithium positive electrode, a graphite negative electrode, a separator material between the lithium positive and graphite negative electrodes, and an electrolyte. Lithium, the element in the lithium positive electrode, is a key element with a core position in modern technology industries. However, the natural reserves of lithium resources are limited, and its mining and refining processes face numerous challenges. Therefore, recovering lithium from the positive electrodes of spent lithium-ion batteries has become a crucial strategy for achieving the sustainable utilization of lithium resources. However, traditional lithium recycling processes are often chemical recycling processes, involving complex procedures and expensive chemical reagents, resulting in high costs and potential environmental pollution. Furthermore, relying solely on the solubility of lithium extraction solutions such as water to extract lithium from lithium electrode materials yields low lithium concentrations and generally low lithium recovery rates. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this disclosure is to provide a grinding apparatus and lithium extraction equipment for lithium batteries, which have a high lithium recovery rate, low lithium extraction cost, and are unlikely to pollute the environment during lithium extraction.

[0005] This disclosure provides a grinding apparatus for lithium extraction from lithium batteries, comprising: a container having a cavity inside and an inlet, a water inlet, a lithium liquid outlet, and an outlet communicating with the cavity, wherein the inlet is for introducing lithium-containing lithium battery fragments; and a grinding element disposed relatively movable within the cavity, wherein a grinding channel is formed between the outer wall of the grinding element and the inner wall of the container, and the relative movement forms grinding of the lithium battery fragments; at least one of the inner peripheral wall of the container and the outer peripheral wall of the grinding element is provided with one or more piezoelectric parts, wherein the piezoelectric parts generate charge movement that promotes lithium deposition when rubbed by water and lithium battery fragments.

[0006] According to some embodiments provided in this disclosure, the piezoelectric portion is protruding from the housing or the grinding element.

[0007] According to some embodiments provided in this disclosure, it further includes: a grinding ball, which is rotatably disposed on the outer peripheral wall of the receiver or the inner peripheral wall of the grinding element.

[0008] According to some embodiments provided in this disclosure, it also includes: a filter screen disposed at the lithium liquid outlet.

[0009] According to some embodiments provided in this disclosure, it further includes: a shielding cover movably disposed at the discharge port to open / close the discharge port.

[0010] According to some embodiments provided in this disclosure, the relative motion includes relative rotation or movement; and / or the inlet is provided with an atomizing nozzle.

[0011] This disclosure also provides lithium extraction equipment for lithium batteries, including: a grinding device for lithium extraction from lithium batteries as described above; and a first lithium liquid container connected to the lithium liquid outlet for collecting lithium liquid.

[0012] According to some embodiments provided in this disclosure, it further includes: a filter element connected to the first lithium liquid container for filtering solid fragments.

[0013] According to some embodiments provided in this disclosure, the lithium battery scrap also includes copper and aluminum scrap and lithium-free electrode scrap;

[0014] The lithium battery lithium extraction equipment further includes: a first centrifuge having a first discharge outlet for discharging copper and aluminum scrap and connected to the stage after the grinding device; and a second centrifuge connected to the stage after the first centrifuge, having a centrifugal force less than the first centrifuge, and having a discharge outlet for discharging lithium liquid and a second discharge outlet for discharging lithium-free electrode scrap.

[0015] According to some embodiments provided in this disclosure, the device further includes: a crushing device, disposed before the grinding device, for receiving and crushing waste lithium batteries to form lithium battery fragments, the lithium battery fragments further including copper and aluminum fragments, separator fragments, lithium-free electrode fragments, and volatile organic compounds; a collecting and distributing device, disposed after the crushing device, for separating the separator fragments and the volatile organic compounds; and a driving device, disposed between the collecting and distributing device and the grinding device, for driving the distributed fragments to the grinding device.

[0016] Beneficial effects:

[0017] (1) The grinding apparatus and lithium extraction equipment for lithium batteries disclosed herein have a high lithium recovery rate, low lithium extraction cost and are difficult to pollute the environment during lithium extraction.

[0018] (2) The grinding apparatus and lithium extraction equipment for lithium batteries disclosed herein have fewer solid impurities in the extracted lithium liquid. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the grinding apparatus according to an embodiment of the present disclosure when cut open.

[0020] Figure 2 This is a schematic diagram of the container in an embodiment of the present disclosure when it is cut open.

[0021] Figure 3 This is a schematic diagram of the structure of the grinding component according to an embodiment of the present disclosure.

[0022] Figure 4 This is a schematic diagram of the arrangement of a lithium battery lithium extraction device according to an embodiment of this disclosure.

[0023] Figure label:

[0024] Grinding device 10;

[0025] Container 11; Receiving cavity 1101; Feed inlet 1102; Water inlet 1103; Lithium liquid outlet 1104; Discharge outlet 1105; Grinding channel 1106; Fitting groove 1107;

[0026] Grinding part 12; Piezoelectric part 121;

[0027] Grinding ball 13;

[0028] Filter 14;

[0029] Cover 15;

[0030] 16 atomizing nozzles;

[0031] Water supply component 17; water storage container 171; drive component 172; water supply pipe 173; water supply valve 174;

[0032] First lithium liquid container 71; Filter element 72;

[0033] First centrifuge 81; First discharge outlet 8101; Second centrifuge 82; Discharge outlet 8201; Second discharge outlet 8202; Copper-aluminum container 83; Second lithium liquid container 84; Lithium-free electrode container 85; Electrode conveying device 86; Electrode input end 861; Electrode output end 862;

[0034] Crushing device 91; material collection and distribution device 92; drive device 93; lithium battery conveying device 94; lithium battery input terminal 941; lithium battery output terminal 942; crushing conveying device 95; crushing input terminal 951; crushing output terminal 952. Detailed Implementation

[0035] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the information disclosed herein. This disclosure can also be implemented or applied through other different specific embodiments, and various details in this disclosure can be modified or changed according to different viewpoints and application modules without departing from the spirit of this disclosure. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this disclosure can be combined with each other.

[0036] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, so that those skilled in the art to which this disclosure pertains can readily implement it. This disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

[0037] In this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic represented in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in any one or a group of embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples represented in this disclosure, as well as the features of those different embodiments or examples.

[0038] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this disclosure, "a set" means two or more, unless otherwise explicitly specified.

[0039] For the purpose of clarity, devices unrelated to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0040] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0041] While the terms first, second, etc., are used in some examples herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, module, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, modules, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0042] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of this disclosure. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in this specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0043] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the message of the present disclosure, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0044] In related technologies, lithium extraction using chemical recycling processes often involves complex procedures and expensive chemical reagents, resulting in high costs and potential environmental pollution. However, relying solely on the solubility of lithium extraction solutions, such as water, to extract lithium from lithium batteries results in low lithium concentrations and generally low lithium recovery rates.

[0045] In view of this, the present disclosure provides a grinding apparatus for lithium extraction from lithium batteries. The grinding apparatus is used to extract lithium during the grinding of lithium-containing lithium battery fragments to pulverize and refine them. The lithium recovery rate is high, the cost is low, and it is difficult to pollute the environment.

[0046] Figure 1 This is a cross-sectional structural diagram of the grinding apparatus according to an embodiment of this disclosure. (See also...) Figure 1The grinding apparatus 10 for lithium extraction from lithium batteries disclosed herein includes a housing 11 and a grinding element 12.

[0047] Figure 2 This is a schematic diagram showing the container 11 of an embodiment of this disclosure when it is cut open. See also... Figure 1 and Figure 2 The container 11 forms a receiving cavity 1101 and an inlet 1102, a water inlet 1103, a lithium liquid outlet 1104, and an outlet 1105 communicating with the receiving cavity 1101. The inlet 1102 is for introducing lithium-containing lithium battery fragments. It is understood that lithium batteries have a lithium-containing positive electrode, and lithium batteries include one or more of lithium iron phosphate batteries, lithium nickel cobalt aluminum oxide batteries (ternary lithium batteries), lithium cobalt oxide batteries, and lithium manganese oxide batteries. When extracting lithium from the lithium battery fragments, the lithium-containing lithium battery fragments are introduced into the receiving cavity 1101 through the inlet 1102, and solvent water is introduced into the receiving cavity 1101 through the water inlet 1103.

[0048] The grinding element 12 is movably disposed within the receiving cavity 1101, and a grinding channel 1106 is formed between the outer wall of the grinding element 12 and the inner wall of the receiving body 11. This relative movement generates grinding action on the lithium battery fragments. The grinding channel 1106 can be understood as a grinding gap formed between the outer wall of the grinding element 12 and the inner wall of the receiving body 11, and the width of the grinding gap corresponds to the target grinding size of the lithium battery fragments. The relative movement between the grinding element 12 and the receiving body 11 can grind the size of the lithium battery fragments to be less than or equal to the gap width.

[0049] Optionally, the container 11 can be arranged in a hollow cylindrical shape, such as a hollow cylinder, as the outer cylinder, and the grinding element 12 can be arranged in a solid or hollow cylindrical shape, such as a solid or hollow cylinder, as the inner cylinder. The inner cylinder is disposed inside the outer cylinder and is relatively movable between the inner cylinder and the outer cylinder, so as to grind the lithium-containing lithium battery fragments between the two when relative movement occurs between the inner cylinder and the outer cylinder.

[0050] In some examples, the container 11 is fixedly disposed, and the grinding element 12 is rotatably disposed about an axis or movably disposed along an axial direction inside the receiving cavity 1101, thereby allowing the grinding element 12 and the container 11 to rotate or move relative to each other, and thus allowing the lithium battery fragments to be ground by the rotation or movement of the grinding element 12 relative to the container 11. Simultaneously, since the container 11 is fixedly disposed, the positions of the feed inlet 1102, the water inlet 1103, the lithium liquid outlet 1104, and the discharge outlet 1105 are also relatively fixed during grinding, facilitating feeding, water intake, liquid discharge, and material discharge. Of course, it is understood that in other examples, the grinding element 12 can be fixedly disposed, and the container 11 can be rotatably disposed about an axis or movably disposed along an axial direction around the grinding element 12, thereby allowing the grinding element 12 and the container 11 to rotate or move relative to each other, and thus allowing the lithium battery fragments to be ground by the rotation or movement of the container 11 relative to the grinding element 12.

[0051] At least one of the inner peripheral wall of the container 11 and the outer peripheral wall of the grinding part 12 is provided with one or more piezoelectric parts 121, which generate charge movement that promotes the precipitation of lithium elements when rubbed by water and lithium battery debris.

[0052] It is understood that the piezoelectric part 121 can be formed by pressing a piezoelectric material or by forming a piezoelectric coating made of a piezoelectric material on its outer surface. The piezoelectric material includes one or more of bismuth ferrite, polytetrafluoroethylene (PTFE), quartz, barium titanate, lead zirconate titanate (PZT), polyvinylidene fluoride (PVDF), lithium niobate, lead zirconate, perovskite materials, sodium polyacrylate, and polylactic acid (PLA). When the piezoelectric material is subjected to pressure, a voltage and charge are generated between its two end faces. When the piezoelectric part 121 is rubbed, it can promote the dissolution of lithium in water, mainly in the following aspects:

[0053] First, the solid-solid friction between the piezoelectric material and the lithium electrode fragments causes electrons in the lithium electrode material to be directly transferred to the surface of the piezoelectric material. Under the action of the micro-electric field force on the surface of the piezoelectric material, lithium ions migrate out of the intrinsic solid phase and dissolve in the water.

[0054] Secondly, the solid-liquid phase friction between the piezoelectric material and water causes the surface charge of the piezoelectric material to transfer to the surface of water molecules and easily generate hydroxyl radicals. Hydroxyl radicals have high oxidation activity, which can oxidize lithium electrode materials and cause lithium ions to be squeezed out and released into the water.

[0055] Third, the solid-gas phase friction between the piezoelectric material and oxygen molecules in the water causes the surface charge of the piezoelectric material to transfer to the surface of the oxygen molecules, generating superoxide radicals. Superoxide radicals have high oxidizing activity, which oxidize the lithium electrode material and cause lithium ions to be squeezed out and released into the water.

[0056] For example, taking lithium iron phosphate as the lithium electrode material, the lithium extraction process includes: (1) Solid-liquid phase friction between the piezoelectric material and water, which causes the surface charge of the piezoelectric material to transfer to the surface of water molecules and easily generate hydroxyl radicals. Hydroxyl radicals have high oxidation activity and can oxidize lithium iron phosphate, causing the divalent iron in lithium iron phosphate to be oxidized to trivalent iron. The lithium ions in the lithium iron phosphate position are occupied by iron, thereby causing the lithium ions to be squeezed out of the lithium iron phosphate olivine crystal and dissolved into the water. (2) Solid-solid phase friction between the piezoelectric material and lithium iron phosphate, which causes the electrons in lithium iron phosphate to be directly transferred to the surface of the piezoelectric material. Under the action of the micro electric field force on the surface of the piezoelectric material, the lithium ions migrate out from the intrinsic solid phase and dissolve in the water. (3) Solid-gas phase friction between the piezoelectric material and oxygen molecules in the water, which causes the surface charge of the piezoelectric material to transfer to the surface of oxygen molecules and generate superoxide radicals. The superoxide radicals oxidize lithium iron phosphate, causing the lithium ions to be released into the water.

[0057] In other words, during the grinding and refining process of the lithium battery fragments, the piezoelectric part 121 made of the piezoelectric material will rub against the water and the lithium battery fragments, thereby causing the charge on the surface of the piezoelectric part 121 to move and form a piezoelectric potential. On one hand, the charge on the surface of the piezoelectric part 121 combines with components in the water to form highly active oxidizing components (hydroxyl radicals, superoxide radicals, and hydrogen peroxide, etc.). These oxidizing components oxidize the lithium electrode material, causing lithium ions to be released and dissolved in the water. At the same time, the micro-electric field force applied by the piezoelectric potential formed by the piezoelectric part 121 promotes the migration of lithium ions from the intrinsic solid phase and their dissolution in the water. This results in a high lithium ion concentration in the lithium solution obtained after grinding, a high lithium recovery rate, low cost, minimal pollution, and good environmental benefits.

[0058] Optionally, the piezoelectric part 121 is protruding from the container 11 or the grinding element 12, thereby increasing the contact area between the container 11 or the grinding element 12 and the grinding material. The protruding piezoelectric part 121 is easily subjected to greater friction and extrusion forces, which is beneficial to improving the grinding effect and forming a larger piezoelectric potential and more charge on the surface of the piezoelectric part, which is beneficial to further promoting the dissolution of lithium in water.

[0059] Figure 3 This is a schematic diagram of the structure of the grinding element 12 according to an embodiment of this disclosure. (See attached diagram.) Figure 1 and Figure 3The piezoelectric portions 121 are multiple, and are uniformly distributed on the inner peripheral wall of the container 11 or the outer peripheral wall of the grinding element 12. For example, the multiple piezoelectric portions 121 are evenly spaced along the circumference of the container 11 or the grinding element 12 to form piezoelectric rings, and the multiple piezoelectric rings are evenly spaced along the axial direction of the container 11 or the grinding element 12. Thus, during the grinding process, the multiple piezoelectric portions 121 can fully contact the lithium battery fragments and water through friction, which is beneficial for the full extraction of lithium.

[0060] Optionally, see Figure 1 and Figure 2 The grinding apparatus 10 for lithium extraction from lithium batteries also includes grinding balls 13. The grinding balls 13 are rotatably disposed on the inner peripheral wall of the container 11 or the outer peripheral wall of the grinding element 12. Thus, during the grinding of the lithium battery fragments, the grinding balls 13 can roll to grind the lithium battery fragments, improving the grinding effect. Simultaneously, the kinetic energy generated by the rolling of the grinding balls 13 can be effectively transferred to water molecules, causing the water molecules to vibrate rapidly, thereby breaking the stable structure of the water molecules, increasing their reactivity, and promoting the combination of water molecules with the charges on the surface of the piezoelectric part 121 to form more oxidizing components, thereby further promoting the dissolution of lithium in water.

[0061] Optionally, when the piezoelectric part 121 is disposed on one of the housing 11 and the grinding element 12, the grinding ball 13 is rotatably disposed on the other of the housing 11 and the grinding element 12. For example, when the piezoelectric part 121 is disposed on the outer peripheral wall of the grinding element 12, the grinding ball 13 is rotatably fitted into the grinding groove 1107 on the inner peripheral wall of the housing 11. Thus, when the grinding ball 13 rolls, it can apply additional mechanical stress to the piezoelectric part 121 through the lithium battery fragments, increasing the friction and extrusion between the piezoelectric part 121 and the lithium battery fragments, causing the piezoelectric part 121 to generate a larger piezoelectric potential and generate more charge on its surface, which is beneficial for promoting further dissolution of lithium ions in water.

[0062] Optionally, the grinding ball 13 can be a zirconium ball. The zirconium ball, as a grinding medium, has high density and high hardness, providing extremely high grinding efficiency and extremely low wear, and maintaining good mechanical properties and stability even in high-intensity working environments.

[0063] Optional, see below Figure 2 The grinding apparatus 10 for lithium extraction from lithium batteries also includes a filter screen 14. The filter screen 14 is located at the lithium liquid outlet 1104. Thus, when the lithium liquid is discharged from the lithium liquid outlet 1104, the filter screen 14 can filter out solid fragments in the lithium liquid, thereby reducing the amount of impurities in the extracted lithium liquid.

[0064] Optionally, the grinding apparatus 10 for lithium extraction from lithium batteries further includes a shielding cover 15. The shielding cover 15 is movably disposed at the discharge port 1105 to open / close the discharge port 1105. For example, the shielding cover 15 is rotatably / movably disposed at the discharge port 1105 to switch between closed and open positions. Thus, when the grinding element 12 and the receiving body 11 are grinding the lithium battery fragments, the shielding cover 15 can be positioned to close the discharge port 1105, thereby ensuring that the lithium battery fragments are unlikely to overflow from the discharge port 1105 during the grinding process. When the lithium battery fragments are ground, the shielding cover 15 is positioned to open the discharge port 1105, allowing the ground lithium battery fragments to be smoothly discharged from the discharge port 1105.

[0065] Optionally, the grinding apparatus 10 for lithium extraction from lithium batteries further includes an atomizing nozzle 16. The atomizing nozzle 16 is located at the water inlet 1103 and is used to spray water mist onto the lithium battery fragments. Water entering the container 11 in the form of a water mist allows the lithium battery fragments to come into full and uniform contact with the water, thus helping to avoid dust splashing during grinding and preventing pollution and waste. Simultaneously, the water in the mist state is more easily activated, and the components in the water more easily combine with the charges on the surface of the piezoelectric part 121 to form oxidizing components, which helps to further dissolve lithium ions in water.

[0066] Optionally, there are multiple water inlets 1103, which are spaced apart along the axial direction of the container 11. There are also multiple atomizing nozzles 16. Each atomizing nozzle 16 is correspondingly positioned at one of the multiple water inlets 1103, thereby spraying water mist onto multiple locations. This ensures that the lithium battery fragments between the container 11 and the grinding piece 12 can uniformly contact the water mist, effectively preventing dust splashing during grinding and promoting thorough and uniform activation of the water.

[0067] Figure 4 This is a schematic diagram of the arrangement of a lithium battery lithium extraction device according to an embodiment of this disclosure. (See also...) Figure 4 This disclosure also provides lithium extraction equipment for lithium batteries, which includes the grinding device 10 as described above.

[0068] Optionally, see Figure 2 and Figure 4The lithium battery lithium extraction equipment also includes a water supply component 61. The water supply component 61 includes a water storage container 611, a drive unit 612, and a water supply pipe 613. The water storage container 611 is used to store water. The water supply pipe 613 is connected to a plurality of atomizing nozzles 16. The drive unit 612 (drive pump) is connected to the water storage container 611 and the water supply pipe 613, and is used to drive the water in the water storage container 611 to flow into the water supply pipe 613, so that the water entering the water supply pipe 613 can be sprayed out through the plurality of atomizing nozzles 16.

[0069] Optionally, the water supply assembly 61 further includes a water supply valve 614. The water supply valve 614 is located in the water supply pipe 613, upstream of the plurality of atomizing nozzles 16, and its opening is adjustable to control the water flow to the plurality of atomizing nozzles 16. Thus, the water supply valve 614 can adjust the water flow by adjusting its opening, thereby controlling the water content between the container 11 and the grinding element 12, which helps maintain grinding stability and ensures a continuous water supply at a certain flow rate.

[0070] Optionally, see Figure 4 The lithium battery lithium extraction equipment further includes a first lithium liquid container 71. The first lithium liquid container 71 is connected to the lithium liquid outlet 1104, so that the lithium liquid output from the lithium liquid outlet 1104 can be collected by the first lithium liquid container 71.

[0071] Optionally, the lithium liquid outlet 1104 is located at the bottom of the container 11, and the first lithium liquid container 71 (lithium liquid collection tank) is connected below the lithium liquid outlet 1104. Thus, the lithium liquid can flow smoothly from the lithium liquid outlet 1104 into the first lithium liquid container 71 under the influence of gravity, without the need for an additional drive pump.

[0072] Optionally, the lithium extraction equipment for lithium batteries further includes a filter element 72. The filter element 72 (filter pump) is connected to the first lithium liquid container 71 and is used to filter out solid debris. Thus, the filter element 72 can filter out solid impurities in the lithium liquid, effectively separating and removing solid impurities from the lithium liquid, while accelerating the discharge rate of the lithium liquid and preventing the lithium liquid from flowing back into the container 11, which helps to ensure stable discharge at the lithium liquid outlet 1104.

[0073] Optionally, the lithium battery lithium extraction equipment further includes a first centrifuge 81 and a second centrifuge 82. The first centrifuge 81 (first centrifugal pump) is connected to the downstream stage of the grinding device 10 and has a first discharge outlet 8101. The second centrifuge 82 is connected to the downstream stage of the first centrifuge 81, and has a smaller centrifugal force than the first centrifuge 81, and has a liquid discharge outlet 8201 and a material discharge outlet 8202.

[0074] Therefore, when the ground lithium battery fragments enter the first centrifuge 81, the first centrifuge 81 can use centrifugal force to separate the copper and aluminum fragments in the ground lithium battery fragments and discharge them through the first discharge outlet 8101. The remaining fragments are fed into the second centrifuge 82 to separate the lithium liquid and the lithium-free electrode fragments. The lithium liquid is discharged through the discharge outlet 8201, and the lithium-free electrode fragments are discharged through the second discharge outlet 8202.

[0075] Optionally, the lithium battery lithium extraction equipment further includes a copper-aluminum container 83. The copper-aluminum container 83 is connected below the first discharge outlet 8101 to collect copper and aluminum scraps in a unified manner.

[0076] Optionally, the lithium battery lithium extraction equipment further includes a second lithium liquid container 84. The second lithium liquid container 84 is connected to the discharge outlet 8201 to collect lithium liquid uniformly.

[0077] Optionally, the lithium battery lithium extraction equipment further includes a lithium-free electrode container 85. The lithium-free electrode container 85 is provided corresponding to the second discharge outlet 8202 to collect lithium-free electrode fragments in a unified manner.

[0078] Optionally, the lithium battery lithium extraction equipment further includes an electrode material conveying device 86. The electrode material conveying device 86 has an electrode material input end 861 and an electrode material output end 862. The electrode material input end 861 is located below the second discharge outlet 8202 and is used to receive lithium-free electrode fragments. The electrode material output end 862 is higher than the electrode material input end 861 and adjacent to the lithium-free electrode material container 85, and is used to output lithium-free electrode fragments to the lithium-free electrode material container 85. Simultaneously, during the process of the lithium-free electrode fragments being conveyed by the electrode material conveying device 86, the lithium-free electrode fragments can be dried, thereby reducing the moisture content of the lithium-free electrode fragments to facilitate subsequent recycling.

[0079] Optionally, the lithium battery lithium extraction equipment further includes a shredding device 91. The shredding device 91 is located before the grinding device 10 and is used to shred waste lithium batteries to form lithium battery fragments. For example, the shredding device 91 includes a shredder. The shredder is used to shred waste lithium batteries to form lithium battery fragments.

[0080] Meanwhile, it is understood that waste lithium batteries also include the lithium battery casing (aluminum casing), graphite negative electrode, separator and electrolyte (volatile organic solvents and electrolytic salts, etc.) located between the lithium positive electrode and graphite negative electrode, aluminum foil coated with lithium positive electrode material, and copper foil coated with graphite negative electrode material. Therefore, the shredded lithium battery fragments also include copper and aluminum fragments, separator fragments, lithium-free electrode fragments, and volatile organic compounds. After being shredded by the shredder, the flexible separator fragments are relatively large, the rigid aluminum casing and copper foil fragments are of medium size, and the lithium electrode and graphite electrode fragments are the smallest.

[0081] Therefore, the lithium battery lithium extraction equipment also includes a material collection and distribution device 92. The material collection and distribution device 92 is located between the crushing device 91 and the grinding device 10, and is used to screen and separate the larger-sized membrane fragments and adsorb the volatile organic compounds, so that the fragments after distribution mainly include copper and aluminum fragments and electrode fragments.

[0082] Optionally, the lithium battery lithium extraction equipment further includes a drive device 93. The drive device 93 (drive pump) is connected to the material collection and distribution device 92 and the feed inlet 1102, and is used to transport the fragmented material after distribution to the grinding device 10.

[0083] Optionally, the lithium battery extraction equipment further includes a lithium battery conveying device 94. The lithium battery conveying device 94 is located before the crushing device 91 and is used to convey waste lithium batteries to the crushing device 91 for crushing. For example, the lithium battery conveying device 94 includes a conveyor belt. The lithium battery conveying device 94 has a lithium battery input end 941 and a lithium battery output end 942. The lithium battery output end 942 is higher than the lithium battery input end 941 and is located adjacent to the crushing device 91. Therefore, after the waste lithium batteries are loaded into the lithium battery input end 941, the lithium battery conveying device 94 can convey the waste lithium batteries to the crushing device 91, which is located at a higher position, for crushing, and the conveying is smooth and stable.

[0084] Optionally, the lithium battery lithium extraction equipment further includes a fragment conveying device 95. The fragment conveying device 95 is located between the fragmentation device 91 and the collection and distribution device 92, and is used to output the divided fragments to the collection and distribution device 92 for distribution. For example, the fragment conveying device 95 includes a conveyor belt or a screw conveyor. The fragment conveying device 95 has a fragment input end 951 and a fragment output end 952. The fragment input end 951 is located adjacent to the fragmentation device 91 and is used to receive the crushed lithium battery fragments. The fragment output end 952 is higher than the fragment input end 951 and located adjacent to the collection and distribution device 92, and is used to output the lithium battery fragments to the collection and distribution device 92. Thus, the lithium battery fragments are conveniently output to the collection and distribution device 92, allowing the collection and distribution device 92 to separate the volatile organic compounds and the membrane fragments.

[0085] The above embodiments are merely illustrative of the principles and effects of this disclosure and are not intended to limit this disclosure. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this disclosure. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this disclosure should still be covered by the protection scope of this disclosure.

Claims

1. A grinding device for lithium extraction from lithium batteries, characterized by, The application relates to a lithium battery scrap grinding device for extracting lithium. The device comprises: a container body, which is internally formed with a containing cavity and a feeding port, a water inlet, a lithium liquid outlet and a discharging port, wherein the feeding port is used for feeding lithium battery scrap containing lithium; and 2. The grinding device for lithium extraction from lithium batteries according to claim 1, characterized in that, a grinding part, which is movably arranged in the containing cavity and is formed with a grinding channel between the outer wall of the grinding part and the inner wall of the container body, and the relative movement forms grinding of the lithium battery scrap; at least one of the inner peripheral wall of the container body and the outer peripheral wall of the grinding part is provided with one or more piezoelectric parts, and the piezoelectric parts are formed with charge movement for promoting lithium element precipitation when the piezoelectric parts are rubbed by water and lithium battery scrap.

3. The grinding device for lithium extraction from lithium batteries according to claim 1, characterized in that, The piezoelectric parts are protrudingly arranged on the container body or the grinding part. The application further relates to:

4. The grinding device for lithium extraction from lithium batteries according to claim 1, characterized in that, a grinding ball, which is rollingly arranged on the outer peripheral wall of the container body or the inner peripheral wall of the grinding part. The application further relates to:

5. The grinding device for lithium extraction from lithium batteries according to claim 1, characterized in that, a filter screen, which is arranged at the lithium liquid outlet. The application further relates to:

6. The grinding device for lithium extraction from lithium batteries according to claim 1, characterized in that, a shielding cover, which is movably arranged at the discharging port to open / close the discharging port. The relative movement comprises relative rotation or movement; and / or 7. A lithium battery lithium extraction apparatus characterized by, an atomizing nozzle is arranged at the water inlet. The application relates to a lithium battery scrap grinding device for extracting lithium. The device comprises: a lithium battery scrap grinding device for extracting lithium according to any one of claims 1-6; and 8. The lithium battery lithium extracting apparatus according to claim 7, characterized in that, a first lithium liquid container, which is communicated with the lithium liquid outlet and is used for collecting lithium liquid. The application further relates to:

9. The lithium battery lithium extracting apparatus according to claim 7, wherein a suction filter part, which is communicated with the first lithium liquid container and is used for suction filtering solid scrap. The lithium battery scrap further comprises copper-aluminum scrap and lithium-free electrode scrap; The lithium battery scrap grinding device further comprises: a first centrifugal separator, which has a first discharging outlet for discharging copper-aluminum scrap and is communicated with the rear stage of the grinding device; 10. The lithium battery lithium extracting apparatus according to claim 7, wherein a second centrifugal separator, which is communicated with the rear stage of the first centrifugal separator, has a smaller centrifugal force than the first centrifugal separator, and has a liquid discharging outlet for discharging lithium liquid and a second discharging outlet for discharging lithium-free electrode scrap. The application further relates to: a scrap device, which is arranged at the front stage of the grinding device and is used for receiving and crushing waste lithium batteries to form lithium battery scrap, wherein the lithium battery scrap further comprises copper-aluminum scrap, diaphragm scrap, lithium-free electrode scrap and volatile organic matter; a material collecting and separating device, which is arranged at the rear stage of the scrap device and is used for separating the diaphragm scrap and the volatile organic matter; a driving device, which is arranged between the material collecting and separating device and the grinding device and is used for driving the separated scrap to the grinding device.

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