A method and device for magnetic separation of lithium battery fragments and a lithium battery crushing and magnetic separation system

Abstract

The invention discloses a magnetic separation method and device for lithium battery fragments and a lithium battery crushing magnetic separation system. The magnetic separation device comprises a belt transmission device consisting of a motor, a pulley, a strong magnetic wheel and a transmission belt, and two discharge channels. The two discharge channels are arranged below the strong magnetic wheel and are respectively located on both sides of the vertical plane where the axis of the strong magnetic wheel is located. The magnetic separation method comprises the following steps: the lithium battery fragments are transmitted to the transmission belt; the motor drives the pulley or the transmission belt to rotate so that the transmission belt performs a cyclic reciprocating movement; the lithium battery fragments are transmitted to the discharge channel through the transmission belt, and when the fragments pass through the strong magnetic wheel, the fragments containing lithium iron phosphate are magnetized and adsorbed on the transmission belt by the strong magnetic wheel, so that the fragments containing lithium iron phosphate and the fragments without lithium iron phosphate fall into different discharge channels, thereby filling the technical gap of using magnetic separation to separate lithium iron phosphate in lithium batteries.

Description

Technical Field

[0001] The invention relates to the field of lithium battery crushing and magnetic separation, and in particular to a method for magnetic separation of lithium battery fragments.

[0002] The invention also relates to a magnetic separation device for lithium battery fragments.

[0003] The invention also relates to a lithium battery crushing and magnetic separation system. Background Art

[0004] The cobalt, lithium, copper, aluminum and plastic in lithium batteries are all valuable resources with extremely high recycling value. At present, the methods for recycling waste lithium batteries generally include physical, chemical and biological methods. Pretreatment is required before processing, and physical operations such as mechanical crushing, screening, magnetic separation and sorting are performed to facilitate subsequent deep processing and separate the materials attached to the positive electrode.

[0005] Since lithium iron phosphate is not magnetic, people usually do not use magnetic separation to sort lithium batteries, and the relevant technology in this area is currently blank. Summary of the invention

[0006] The purpose of the present invention is to provide a method and device for magnetic separation of lithium battery fragments and a lithium battery crushing magnetic separation system to solve the technical problem of how to use magnetic separation to separate metals from waste lithium batteries.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0008] The present application provides a method for magnetic separation of lithium battery fragments, the method is performed using a magnetic separation device, the magnetic separation device comprises a motor, a pulley, a strong magnetic wheel, a transmission belt and a discharge channel, the pulley or the strong magnetic wheel is connected to the motor by transmission, the strong magnetic wheel is parallel to the axis of the pulley and is connected by transmission through the transmission belt, the discharge channel has two and is arranged below the strong magnetic wheel, and the two discharge channels are respectively arranged on both sides of the vertical plane where the axis of the strong magnetic wheel is located; the magnetic separation method comprises the following steps: transmitting the lithium battery fragments to the transmission belt; The motor drives the pulley or the conveyor belt to rotate so that the conveyor belt performs a cyclic reciprocating movement; the lithium battery fragments are transmitted to the discharge channel through the conveyor belt, and when the fragments pass through the strong magnetic wheel, the fragments without lithium iron phosphate fall into one of the discharge channels, while the fragments containing lithium iron phosphate are magnetized and adsorbed on the conveyor belt by the strong magnetic wheel, and the fragments containing lithium iron phosphate cross one of the discharge channels and move to the top of another discharge channel, and at the same time, the fragments containing lithium iron phosphate break away from the adsorption of the strong magnetic wheel and fall into different discharge channels with the fragments without lithium iron phosphate.

[0009] Furthermore, the magnetic separation device also includes a discharge valve and a first electromagnet, the discharge valve is arranged above the conveyor belt, and the output end of the discharge valve faces the conveyor belt, and the first electromagnet is suspended above the conveyor belt and is located between the discharge channel and the strong magnetic wheel; the magnetic separation method also includes the following steps: before the lithium battery fragments are transmitted to the strong magnetic wheel through the conveyor belt, the first electromagnet is started to magnetize and adsorb the lithium iron phosphate-containing fragments in the lithium battery fragments until all the lithium iron phosphate-free fragments pass under the first electromagnet, and then the first electromagnet is closed, and the adsorbed lithium iron phosphate-containing fragments fall onto the conveyor belt; the discharge valve is closed when the first electromagnet is started; the discharge valve is started when the first electromagnet is closed to transmit the lithium battery fragments to the conveyor belt.

[0010] As another aspect of the present invention, the magnetic separation device also includes a conveyor belt vibrator and a second electromagnet, the conveyor belt vibrator and the second electromagnet are both arranged below the conveyor belt, and the actuator of the conveyor belt vibrator faces the conveyor belt, and the second electromagnet is located between the conveyor belt vibrator and the strong magnetic wheel and close to the conveyor belt vibrator; the magnetic separation method also includes the following steps: the conveyor belt vibrator vibrates the conveyor belt so that the lithium battery fragments moving through the conveyor belt toward the strong magnetic wheel are thrown into the air; the second electromagnet magnetizes and absorbs the lithium iron phosphate-containing fragments in the lithium battery fragments, the lithium iron phosphate-containing fragments fall from the air under the action of gravity and magnetism and cover the conveyor belt, and the lithium iron phosphate-free fragments fall from the air under the action of gravity and magnetism and cover the lithium iron phosphate-containing fragments.

[0011] The present application also provides a magnetic separation device for lithium battery fragments, comprising: a pulley with a horizontally arranged axis; a strong magnetic wheel, parallel to the axis of the pulley and connected to the pulley via a transmission belt; a motor, connected to the pulley or the strong magnetic wheel; and two discharge channels, which are arranged below the strong magnetic wheel, and the two discharge channels are respectively arranged on both sides of the vertical plane where the axis of the strong magnetic wheel is located.

[0012] Furthermore, it also includes: a discharge valve, which is arranged above the conveyor belt and has an output end facing the conveyor belt; a first electromagnet, which is suspended above the conveyor belt and is located between the discharge channel and the strong magnetic wheel.

[0013] As another aspect of the present invention, it also includes: a conveyor belt vibrator, which is arranged below the conveyor belt, and the actuator of the conveyor belt vibrator is facing the conveyor belt; a second electromagnet, which is arranged below the conveyor belt, and the second electromagnet is located between the conveyor belt vibrator and the strong magnetic wheel and close to the conveyor belt vibrator.

[0014] The present application also provides a lithium battery crushing and magnetic separation system, comprising the claimed magnetic separation device, and also comprising: a crushing module, used to crush lithium batteries and output lithium battery fragments; a first screen sorting device, having an input end connected to the output end of the crushing module, the first screen sorting device comprising a first screen for screening lithium battery fragments, wherein lithium battery fragments smaller than the mesh of the first screen enter the input end of the magnetic separation device under the action of gravity, and lithium battery fragments larger than the mesh of the first screen are transmitted to the input end of the crushing module through a transmission device.

[0015] Furthermore, the crushing module includes: a roller cutter crusher for inputting lithium batteries and outputting lithium iron phosphate-free fragments, lithium iron phosphate-containing fragments and lithium iron phosphate powder; a second screen sorting device, arranged at the output end of the roller cutter crusher, the second screen sorting device includes a second screen for screening lithium iron phosphate powder, wherein lithium iron phosphate powder with a mesh smaller than that of the second screen is collected, and lithium iron phosphate-free fragments and lithium iron phosphate-containing fragments with a mesh larger than that of the second screen are transmitted to the output end of the second screen sorting device; a roller crusher having an input end connected to the output end of the second screen sorting device, the roller crusher is used for secondary crushing of lithium iron phosphate-free fragments and lithium iron phosphate-containing fragments, and the output end of the roller crusher is connected to the input end of the first screen sorting device.

[0016] Furthermore, the first screen sorting device includes: a first channel, which is perpendicular to the first screen and wrapped around the outside of the first screen; a second channel, which is perpendicular to the first screen and connected to one side of the first screen, and the bottom end of the second channel is connected to the input end of the transmission device; a wind generator, which is arranged on the side of the first screen away from the second channel, and the wind generator is used to output an airflow parallel to the first screen and moving toward the second channel.

[0017] Furthermore, one end of the first screen close to the wind generator is higher than one end of the first screen close to the second channel; there are a plurality of first screens and they are arranged in parallel along the first channel.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] Provided are a method and device for magnetic separation of lithium battery fragments and a lithium battery crushing magnetic separation system, which crushes the lithium battery into fragments containing lithium iron phosphate and fragments without lithium iron phosphate, and then magnetizes the lithium iron phosphate-containing fragments through a strong magnetic field to separate them from the fragments without lithium iron phosphate through the principle of magnetic separation, thus filling the technical gap of using magnetic separation to separate lithium iron phosphate in lithium batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 It is a three-dimensional structural diagram of the magnetic separation device of Example 1 of the present invention;

[0022] Figure 2 A mechanical schematic diagram of the working process of the magnetic separation device of Example 1 of the present invention;

[0023] Figure 3 A mechanical schematic diagram of the working process of the magnetic separation device of Example 2 of the present invention;

[0024] Figure 4 A mechanical schematic diagram of the working process of the magnetic separation device of Example 3 of the present invention;

[0025] Figure 5 This is a front view of Embodiment 4 of the present invention;

[0026] Figure 6 A three-dimensional diagram of the internal structure of Embodiment 4 of the present invention;

[0027] Figure 7 A three-dimensional diagram of a second screen sorting device according to Embodiment 4 of the present invention;

[0028] Figure 8 A three-dimensional diagram of the internal structure of the first screen sorting device and the transmission device of Example 4 of the present invention;

[0029] The numbers in the figure represent the following:

[0030] 1-Roller cutter;

[0031] 2-second screen sorting device; 21-second screen; 22-linear slide; 23-crank connecting rod mechanism; 24-first motor; 25-collection box; 26-discharging port;

[0032] 3-Roller Crusher;

[0033] 4-first screen sorting device; 41-first screen; 42-first channel; 43-second channel; 44-wind generator;

[0034] 5-transmission device; 51-third channel; 52-spiral blade; 53-second motor;

[0035] 6-magnetic separation device; 61-motor; 62-pulley; 63-strong magnetic wheel; 64-transmission belt; 65-discharging channel; 66-discharging valve; 67-first electromagnet; 68-transmission belt vibrator; 69-second electromagnet. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1 As shown, Example 1 of the magnetic separation method is provided.

[0038] The magnetic separation method of lithium battery fragments is performed using a magnetic separation device 6, which includes a motor 61, a pulley 62, a strong magnetic wheel 63, a transmission belt 64 and a discharge channel 65. The pulley 62 or the strong magnetic wheel 63 is connected to the motor 61 by transmission, the strong magnetic wheel 63 is parallel to the axis of the pulley 62 and is connected by transmission through the transmission belt 64, and there are two discharge channels 65 and they are arranged below the strong magnetic wheel 63. The two discharge channels 65 are respectively arranged on both sides of the vertical plane where the axis of the strong magnetic wheel 63 is located;

[0039] The strong magnetic wheel 63 includes a strong magnetic core composed of high-strength rare earth neodymium iron boron, and the magnetic field strength can reach 16000gs. The strong magnetism can induce the lithium iron phosphate to generate magnetism.

[0040] The magnetic separation method comprises the following steps:

[0041] The lithium battery fragments are transmitted to the conveyor belt 64 ; after the lithium battery is crushed by the crushing module, a number of fragments are generated, and the fragments fall onto the conveyor belt 64 in a loose state.

[0042] The motor 61 drives the pulley 62 or the transmission belt 64 to rotate, so that the transmission belt 64 performs a cyclic reciprocating movement; the transmission belt 64 is made of non-magnetic rubber or stainless steel, and the surface of the transmission belt 64 can also form a plurality of grooves perpendicular to its moving direction, thereby improving the performance of the transmission belt 64 in transmitting fragments so that it overcomes the magnetic force of the strong magnetic wheel 63 and moves.

[0043] The lithium battery fragments are transmitted to the discharge channel 65 via the conveyor belt 64. When the fragments pass through the strong magnetic wheel 63, the fragments without lithium iron phosphate fall into a discharge channel 65, while the fragments containing lithium iron phosphate are magnetized and adsorbed on the conveyor belt 64 by the strong magnetic wheel 63. The fragments containing lithium iron phosphate cross one discharge channel 65 and move to the top of another discharge channel 65. At the same time, the fragments containing lithium iron phosphate break away from the adsorption of the strong magnetic wheel 63 and fall into different discharge channels 65 with the fragments without lithium iron phosphate.

[0044] like Figure 2 As shown, not all lithium iron phosphate and non-magnetic fragments can fall into the two discharge channels 65 respectively. In the process of the fragments falling onto the conveyor belt 64 in a loose state: if the lithium iron phosphate covers the non-magnetic fragments, when the non-magnetic fragments are separated from the conveyor belt 64, the lithium iron phosphate above them will also be separated, causing the lithium iron phosphate to fall into the non-designated discharge channel 65. At the same time, when the lithium iron phosphate is adsorbed by the strong magnetic wheel 63, the non-magnetic fragments will also be pressed by the lithium iron phosphate, which will prevent the non-magnetic fragments from falling into the designated discharge channel 65.

[0045] Further:

[0046] For the technical problems in Example 1, Figure 3 As shown, based on Example 1, Example 2 is provided.

[0047] The magnetic separation device 6 further includes a discharge valve 66 and a first electromagnet 67. The discharge valve 66 is arranged above the conveyor belt 64, and the output end of the discharge valve 66 faces the conveyor belt 64. The first electromagnet 67 is suspended above the conveyor belt 64 and is located between the discharge channel 65 and the strong magnetic wheel 63.

[0048] The magnetic separation method also includes the following steps:

[0049] Before the lithium battery fragments are transmitted to the strong magnetic wheel 63 through the conveyor belt 64, the first electromagnet 67 is started to magnetize and adsorb the lithium iron phosphate-containing fragments in the lithium battery fragments until all the lithium iron phosphate-free fragments pass under the first electromagnet 67, and then the first electromagnet 67 is turned off, and the adsorbed lithium iron phosphate-containing fragments fall onto the conveyor belt 64; the function of the first electromagnet 67 is to separate the lithium iron phosphate-containing fragments from the lithium iron phosphate-free fragments in the lithium battery fragments, so that both are located on the conveyor belt 64 but do not cover each other.

[0050] When the first electromagnet 67 is activated, the unloading valve 66 is closed;

[0051] When the first electromagnet 67 is closed, the unloading valve 66 is activated to transfer the lithium battery fragments to the conveyor belt 64 .

[0052] The unloading valve 66 is used to intermittently feed the conveyor belt 64 to prevent the lithium iron phosphate-containing fragments from covering subsequent lithium battery fragments when the first electromagnet 67 is closed to transfer the lithium iron phosphate-containing fragments to the conveyor belt 64 .

[0053] Optional:

[0054] For the technical problems in Example 1, Figure 4 As shown, based on Example 1, Example 3 is provided.

[0055] The magnetic separation device 6 further includes a conveyor belt vibrator 68 and a second electromagnet 69, both of which are arranged below the conveyor belt 64, and the actuator of the conveyor belt vibrator 68 faces the conveyor belt 64, and the second electromagnet 69 is located between the conveyor belt vibrator 68 and the strong magnetic wheel 63 and close to the conveyor belt vibrator 68;

[0056] The magnetic separation method also includes the following steps:

[0057] The conveyor belt vibrator 68 vibrates the conveyor belt 64 so that the lithium battery fragments moving toward the strong magnetic wheel 63 through the conveyor belt 64 are thrown into the air;

[0058] The second electromagnet 69 magnetizes and absorbs the lithium iron phosphate-containing fragments in the lithium battery fragments. The lithium iron phosphate-containing fragments fall from the air under the action of gravity and magnetism and cover the conveyor belt 64, and the non-lithium iron phosphate fragments fall from the air under the action of gravity and cover the lithium iron phosphate-containing fragments.

[0059] Specifically, the conveyor belt vibrator 68 includes a vibration hammer driven by a motor, and the vibration hammer hammers the bottom surface of the conveyor belt 64 from bottom to top.

[0060] The lithium battery fragments transmitted to the strong magnetic wheel 63 do not include the situation where the lithium iron phosphate-containing fragments cover the non-lithium iron phosphate fragments, so the technical problem in Example 1 will not occur.

[0061] Further:

[0062] In order to provide the magnetic separation device 6 with lithium iron phosphate-containing fragments and lithium iron phosphate-free fragments, such as Figure 5 , 6 As shown, Example 4 is provided.

[0063] The crushing and magnetic separation system of lithium batteries includes a magnetic separation device 6 and further includes:

[0064] Crushing module, used to crush lithium batteries and output lithium battery fragments;

[0065] The first screen sorting device 4 has an input end connected to the output end of the crushing module, and the first screen sorting device 4 includes a first screen 41 for screening lithium battery fragments, wherein lithium battery fragments smaller than the mesh of the first screen 41 enter the input end of the magnetic separation device 6 under the action of gravity, and lithium battery fragments larger than the mesh of the first screen 41 are transmitted to the input end of the crushing module through the transmission device 5.

[0066] The lithium battery is repeatedly crushed by the combined operation of the crushing module, the first screen sorting device 4 and the transmission device 5 until lithium iron phosphate-containing fragments and lithium iron phosphate-free fragments that are easily magnetically separated by the magnetic separation device 6 are separated.

[0067] Optionally:

[0068] Crushing modules include:

[0069] A roller cutter crusher 1, for inputting lithium batteries and outputting lithium iron phosphate-free fragments, lithium iron phosphate-containing fragments and lithium iron phosphate powder;

[0070] A second screen sorting device 2 is arranged at the output end of the roller cutter crusher 1, and the second screen sorting device 2 comprises a second screen 21 for screening lithium iron phosphate powder, wherein lithium iron phosphate powder with meshes smaller than the second screen 21 is collected, and lithium iron phosphate-free fragments and lithium iron phosphate-containing fragments with meshes larger than the second screen 21 are transmitted to the output end of the second screen sorting device 2;

[0071] The roller crusher 3 has an input end connected to the output end of the second screen sorting device 2. The roller crusher 3 is used for secondary crushing of fragments without lithium iron phosphate and fragments containing lithium iron phosphate. The output end of the roller crusher 3 is connected to the input end of the first screen sorting device 4.

[0072] Specific:

[0073] like Figure 7 As shown, the second screen sorting device 2 also includes a linear slide 22 connected to the second screen 21, and the second screen 21 can slide on the linear slide 22. The second screen 21 has an angle of no more than 5 degrees with the horizontal plane, and the output end of the second screen 21 is arranged at its lower end. The second screen 21 is connected to the output shaft of the first motor 24 through a crank-connecting rod mechanism 23, so that the second screen 21 can perform linear reciprocating movement, so that the lithium iron phosphate powder on the second screen 21 falls into the collecting box 25, and the lithium iron phosphate-free fragments and lithium iron phosphate-containing fragments on the second screen 21 fall into the input end of the roller crusher 3 through the discharge port 26.

[0074] Further:

[0075] The first screen sorting device 4 comprises:

[0076] A first channel 42, perpendicular to the first screen 41 and wrapped around the outside of the first screen 41;

[0077] A second channel 43 is perpendicular to the first screen 41 and connected to one side of the first screen 41, and the bottom end of the second channel 43 is connected to the input end of the transmission device 5;

[0078] The wind generator 44 is disposed on a side of the first screen 41 away from the second channel 43 , and is used for outputting an airflow parallel to the first screen 41 and moving toward the second channel 43 .

[0079] The lithium iron phosphate-free fragments and the lithium iron phosphate-containing fragments move through the first channel 42, wherein the fragments smaller than the mesh size of the first sieve 41 fall into the input end of the magnetic separation device 6, and the fragments larger than the mesh size of the first sieve 41 are blown into the second channel 43 by the wind force generated by the wind generator 44, and then moved to the input end of the roller crusher 3 through the transmission device 5 to be crushed again.

[0080] like Figure 6 , 8 As shown, the transmission device 5 includes a third channel 51 connected to the bottom end of the second channel 43, the other end of the third channel 51 is connected to the input end of the roller crusher 3, and a rotating spiral blade 52 is arranged inside the third channel 51. The spiral blade 52 is driven to rotate by the second motor 53, so as to move the fragments at the bottom of the third channel 51 to the top of the third channel 51 and make it fall into the roller crusher 3.

[0081] Further:

[0082] One end of the first screen 41 close to the wind generator 44 is higher than one end of the first screen 41 close to the second channel 43, and an angle of no more than 5 degrees is formed between the first screen 41 and the horizontal plane;

[0083] There are a plurality of first screens 41 , which are arranged in parallel along the first passage 42 .

[0084] The number of the first screens 41 and their inclination angles help to move large fragments to the inside of the second channel 43 , thereby reducing the number of large fragments entering the magnetic separation device 6 through the first channel 42 .

[0085] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A method for magnetic separation of lithium battery fragments, characterized in that: The magnetic separation method is performed using a magnetic separation device, which includes a motor, a pulley, a strong magnetic wheel, a transmission belt and a discharge channel. The pulley or the strong magnetic wheel is connected to the motor by transmission, the strong magnetic wheel is parallel to the axis of the pulley and is connected by transmission through the transmission belt, and there are two discharge channels arranged below the strong magnetic wheel, and the two discharge channels are respectively arranged on both sides of the vertical plane where the axis of the strong magnetic wheel is located; The magnetic separation method comprises the following steps: The lithium battery fragments are transmitted to the conveyor belt; the motor drives the pulley or the conveyor belt to rotate so that the conveyor belt performs a cyclic reciprocating movement; the lithium battery fragments are transmitted to the discharge channel through the conveyor belt, and when the fragments pass through the strong magnetic wheel, the fragments without lithium iron phosphate fall into one of the discharge channels, while the fragments containing lithium iron phosphate are magnetized and adsorbed on the conveyor belt by the strong magnetic wheel, and the fragments containing lithium iron phosphate cross one of the discharge channels and move to the top of another discharge channel, and at the same time, the fragments containing lithium iron phosphate are separated from the adsorption of the strong magnetic wheel and fall into different discharge channels with the fragments without lithium iron phosphate; The magnetic separation device further comprises a discharge valve and a first electromagnet, wherein the discharge valve is arranged above the conveyor belt, and an output end of the discharge valve faces the conveyor belt, and the first electromagnet is suspended above the conveyor belt and is located between the discharge channel and the strong magnetic wheel; The magnetic separation method further comprises the following steps: Before the lithium battery fragments are transmitted to the strong magnetic wheel through the conveyor belt, the first electromagnet is started to magnetize and adsorb the lithium iron phosphate-containing fragments in the lithium battery fragments until all the lithium iron phosphate-free fragments pass under the first electromagnet, and then the first electromagnet is closed, and the adsorbed lithium iron phosphate-containing fragments fall onto the conveyor belt; the unloading valve is closed when the first electromagnet is started; When the first electromagnet is closed, the unloading valve is activated to transfer the lithium battery fragments to the conveyor belt.

2. A magnetic separation device for lithium battery fragments, characterized in that: include: The pulley (62) has a horizontal axis; A strong magnetic wheel (63) is parallel to the axis of the belt pulley (62) and is connected to the belt pulley (62) via a transmission belt (64); A motor (61) drivingly connected to the pulley (62) or the strong magnetic wheel (63); There are two discharge channels (65) disposed below the strong magnetic wheel (63), and the two discharge channels (65) are disposed respectively on both sides of a vertical plane where the axis of the strong magnetic wheel (63) is located; a discharge valve (66), arranged above the conveyor belt (64), with an output end facing the conveyor belt (64); A first electromagnet (67) is suspended above the conveyor belt (64) and is located between the discharge channel (65) and the strong magnetic wheel (63); Before the lithium battery fragments are transmitted to the strong magnetic wheel (63) via the conveyor belt (64), the first electromagnet (67) is activated to magnetize and absorb the lithium iron phosphate-containing fragments in the lithium battery fragments until all the lithium iron phosphate-free fragments pass under the first electromagnet (67), and then the first electromagnet (67) is closed, and the absorbed lithium iron phosphate-containing fragments fall onto the conveyor belt (64); when the first electromagnet (67) is activated, the discharge valve (66) is closed, and when the first electromagnet (67) is closed, the discharge valve (66) is activated to transmit the lithium battery fragments to the conveyor belt.

3. A lithium battery crushing and magnetic separation system, characterized in that: The magnetic separation device (6) according to claim 2 further comprises: Crushing module, used to crush lithium batteries and output lithium battery fragments; A first screen sorting device (4) having an input end connected to the output end of the crushing module, the first screen sorting device (4) comprising a first screen (41) for screening lithium battery fragments, wherein lithium battery fragments smaller than the mesh size of the first screen (41) enter the input end of the magnetic separation device (6) under the action of gravity, and lithium battery fragments larger than the mesh size of the first screen (41) are transmitted to the input end of the crushing module through a transmission device (5); The crushing module comprises: A roller cutter crusher (1) is used to input lithium batteries and output lithium iron phosphate-free fragments, lithium iron phosphate-containing fragments and lithium iron phosphate powder; a second screen sorting device (2) arranged at the output end of the roller cutter crusher (1), the second screen sorting device (2) comprising a second screen (21) for screening lithium iron phosphate powder, wherein lithium iron phosphate powder with meshes smaller than the meshes of the second screen (21) is collected, and lithium iron phosphate-free fragments and lithium iron phosphate-containing fragments with meshes larger than the meshes of the second screen (21) are transmitted to the output end of the second screen sorting device (2); a roller crusher (3) having an input end connected to the output end of the second screen sorting device (2), the roller crusher (3) being used for secondary crushing of fragments without lithium iron phosphate and fragments containing lithium iron phosphate, the output end of the roller crusher (3) being connected to the input end of the first screen sorting device (4); The first screen sorting device (4) comprises: A first channel (42) is perpendicular to the first screen (41) and wrapped around the outside of the first screen (41); a second channel (43) perpendicular to the first screen (41) and connected to one side of the first screen (41), wherein the bottom end of the second channel (43) is connected to an input end of the transmission device (5); a wind generator (44) disposed on a side of the first screen (41) away from the second channel (43), the wind generator (44) being used to output an airflow parallel to the first screen (41) and moving toward the second channel (43); An end of the first screen (41) close to the wind generator (44) is higher than an end of the first screen (41) close to the second channel (43); The first screens (41) are in plurality and are arranged in parallel along the first channel (42).

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