Positive and negative pole piece multi-stage compound sorting device and sorting system

Abstract

The utility model provides a multi-stage compound sorting device and sorting system for positive and negative pole pieces, and belongs to the technical field of battery recovery. The device comprises a device body, a first compound magnetic separation group, a second compound magnetic separation group, a first guide pipe and a third compound magnetic separation group, the first compound magnetic separation group is positioned in the device body and is used for collecting and magnetically separating positive and negative pole pieces conveyed to the device body; the projection parts of the second compound magnetic separation group and the first compound magnetic separation group along the first direction coincide so as to perform secondary magnetic separation on the positive and negative pole pieces, and the feeding end of the first guide pipe is connected with the second compound magnetic separation group so as to collect the positive and negative pole pieces which are not subjected to magnetic separation; the third compound magnetic separation group is connected with the discharging end of the first guide pipe and is arranged at an interval in the first direction relative to the second compound magnetic separation group; the first compound magnetic separation group, the second compound magnetic separation group and the third compound magnetic separation group are laminated in a multi-stage manner to continuously perform magnetic separation on the positive and negative pole pieces, so that the magnetic separation effect of the positive and negative pole pieces during single-time conveying can be greatly improved.

Description

Technical Field

[0001] This patent relates to the field of battery recycling technology, and in particular to a multi-stage compound sorting device and sorting system for positive and negative electrode sheets. Background Art

[0002] With the continuous promotion of new energy vehicles, lithium battery technology has developed rapidly, and the production of lithium batteries has also increased dramatically. However, the service life of lithium batteries is limited, so the number of retired lithium batteries has also increased. How to recycle and handle retired lithium batteries has become a key link in the realization of a circular economy for new energy.

[0003] Lithium batteries are generally made of seven major components: positive electrode powder, aluminum foil, separator, negative electrode powder, copper foil, shell and electrolyte. The inside of the shell is a core package composed of hundreds or thousands of layers of positive electrode sheets (positive electrode powder coated on aluminum foil), separators, and negative electrode sheets (graphite coated on copper foil) stacked on top of each other, and electrolyte is added to make it moist and conductive.

[0004] At present, the recycling of lithium batteries usually involves crushing the battery as a whole, burning the electrolyte through pyrolysis, separating the diaphragm by wind, separating the shell material by gravity, and crushing it again to separate the copper foil powder, aluminum foil powder and mixed powder using a gravity bed. Only five materials were recycled. Since the crushing and powdering process in which the positive and negative electrodes were not separated in advance was adopted, the positive and negative electrode mixed powders could not be separated in the later stage, which inevitably caused the negative electrode graphite to become a waste slag burden and exist in the subsequent resource recycling process such as hydrometallurgy. Not only that, since the positive and negative electrodes were crushed together, it was inevitable that the fine powders of copper foil, aluminum foil and mixed materials could not be separated and mixed with each other, which reduced the resource recovery rate and reduced the purity of the materials. Utility Model Content

[0005] The technical problem to be solved by the present invention is that the existing device cannot achieve high recovery accuracy when sorting positive electrode sheets and negative electrode sheets.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a positive and negative electrode sheet multi-stage compound sorting device, which includes:

[0007] device body,

[0008] The first compound magnetic separation group is located inside the device body to collect and magnetically separate the positive and negative electrode sheets transported to the device body;

[0009] A second compound magnetic separation group, wherein the projection of the second compound magnetic separation group along the first direction overlaps with that of the first compound magnetic separation group, so as to perform secondary magnetic separation on the positive and negative pole pieces, and the second compound magnetic separation group is spaced apart from the first compound magnetic separation group along the first direction;

[0010] A first conduit, wherein the feed end of the first conduit is connected to the second compound magnetic separation group to collect the positive and negative electrode sheets that have not been magnetically separated;

[0011] a third compound magnetic separation group, the third compound magnetic separation group is connected to the discharge end of the first conduit, and the third compound magnetic separation group is spaced apart along the first direction relative to the second compound magnetic separation group;

[0012] A positive electrode pipeline, the positive electrode pipeline is used to collect the positive electrode sheets separated in the first compound magnetic separation group, the second compound magnetic separation group and the third compound magnetic separation group;

[0013] A negative electrode pipeline, the negative electrode pipeline is used to collect the negative electrode pieces separated in the first compound magnetic separation group, the second compound magnetic separation group and the third compound magnetic separation group;

[0014] The first direction is the direction of gravity.

[0015] In some embodiments, the aforementioned positive and negative electrode sheet compound separation device, wherein the first compound magnetic separation group includes a first magnetic roller belt, a first magnetic roller, a first conduit and a second conduit;

[0016] The first magnetic roller belt extends along the second direction to absorb the positive electrode sheet and transport the negative electrode sheet. The end of the first magnetic roller belt is connected to the second conduit. The other end of the second conduit is connected to the first magnetic roller to magnetically separate the positive and negative electrode sheets again. The first magnetic roller extends along the second direction. The first magnetic rollers are spaced relative to the first magnetic roller belt along the first direction. The other end of the first magnetic roller is connected to the positive electrode pipeline and the negative electrode pipeline respectively.

[0017] The second direction is perpendicular to the first direction and perpendicular to the conveying direction of the positive and negative electrode sheets.

[0018] In some embodiments, the aforementioned positive and negative electrode sheet compound separation device, wherein the second compound magnetic separation group includes a second magnetic roller belt, a second magnetic roller, a third conduit and a fourth conduit;

[0019] The second magnetic roller belt overlaps with the projection part of the first magnetic roller belt along the first direction to receive the positive and negative pole pieces after magnetic separation. The ends of the second magnetic roller belt are respectively connected with the third conduit and the fourth conduit. The other end of the third conduit is connected with the second magnetic roller to magnetically separate the positive and negative pole pieces again. The other end of the fourth conduit is connected with the third compound magnetic separation group. The second magnetic rollers are spaced relative to the second magnetic roller belt along the first direction. The side of the second magnetic roller facing away from the third conduit is respectively connected with the positive pole pipeline and the negative pole pipeline.

[0020] The third compound magnetic separation group includes a third magnetic roller, a fourth magnetic roller and a fifth guide tube;

[0021] The third magnetic roller and the fourth magnetic roller are spaced apart along the first direction, the fifth conduit is used to connect the third magnetic roller and the fourth magnetic roller, and the side of the fourth magnetic roller facing away from the third magnetic roller is connected to the positive electrode pipeline and the negative electrode pipeline respectively;

[0022] The second magnetic roller, the third magnetic roller and the fourth magnetic roller have the same structure as the first magnetic roller.

[0023] In some embodiments, in the aforementioned positive and negative electrode sheet duplex sorting device, the third magnetic roller and the second magnetic roller are spaced apart along the second direction to avoid mutual influence of magnetic attraction forces.

[0024] In some embodiments, in the aforementioned positive and negative electrode sheet duplex sorting device, the position of the fourth magnetic roller is offset toward the side of the third magnetic roller away from the second magnetic roller.

[0025] In some embodiments, in the aforementioned positive and negative electrode sheet compound sorting device, a receiving hopper is provided between the fourth magnetic roller and the negative electrode pipe, and there are two receiving hoppers, which are spaced apart along the second direction to increase the conveying capacity of the negative electrode sheets.

[0026] A second aspect of the present application provides a sorting system, which includes the aforementioned positive and negative electrode sheet complex sorting device.

[0027] Through the above technical scheme, the present invention provides a positive and negative electrode sheet multi-stage compound sorting device, which can greatly improve the magnetic separation effect of the positive and negative electrode sheets during single transportation by continuously magnetically separating the positive and negative electrode sheets through the multi-stage stacking of the first compound magnetic separation group, the second compound magnetic separation group and the third compound magnetic separation group. At the same time, the positive electrode sheets and the negative electrode sheets after each magnetic separation can be separately collected through the positive electrode pipeline and the negative electrode pipeline, which greatly improves the sorting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 is a schematic diagram of the overall structure of the glass processing device disclosed in the embodiment of the present disclosure;

[0030] Figure 2 It is a schematic diagram of a specific structure of the connection of the crushing sections of the glass processing device disclosed in the embodiment of the present disclosure;

[0031] Description of reference numerals:

[0032] 1. Device body; 2. First compound magnetic separation group; 21. First magnetic roller belt; 22. First magnetic roller; 23. Second conduit; 3. Second compound magnetic separation group; 31. Second magnetic roller belt; 32. Second magnetic roller; 33. Third conduit; 34. Fourth conduit; 4. First conduit; 5. Third compound magnetic separation group; 51. Third magnetic roller; 52. Fourth magnetic roller; 53. Fifth conduit; 6. Positive electrode pipeline; 7. Negative electrode pipeline; 8. Receiving hopper; a. First direction; b. Second direction. DETAILED DESCRIPTION

[0033] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0034] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0035] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply 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 of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0036] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0037] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0038] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0040] Embodiment 1

[0041] Reference Figure 1 and attached Figure 2 This embodiment discloses a positive and negative electrode multi-stage compound sorting device, which includes:

[0042] The device body 1, the first compound magnetic separation group 2, the second compound magnetic separation group 3, the first conduit 4, the third compound magnetic separation group 5, the positive electrode pipeline 6, and the negative electrode pipeline 7; the first compound magnetic separation group 2 is located inside the device body 1 to collect and magnetically separate the positive and negative electrode sheets transported to the device body 1; the second compound magnetic separation group 3 overlaps with the projection part of the first compound magnetic separation group 2 along the first direction a to perform secondary magnetic separation on the positive and negative electrode sheets, and the second compound magnetic separation group 3 is spaced relative to the first compound magnetic separation group 2 along the first direction a; the feed end of the first conduit 4 It is connected to the second compound magnetic separation group 3 to collect the positive and negative electrode pieces that have not been magnetically separated; the third compound magnetic separation group 5 is connected to the discharge end of the first conduit 4, and the third compound magnetic separation group 5 is spaced relative to the second compound magnetic separation group 3 along the first direction a; the positive electrode pipeline 6 is used to collect the positive electrode pieces separated from the first compound magnetic separation group 2, the second compound magnetic separation group 3 and the third compound magnetic separation group 5; the negative electrode pipeline 7 is used to collect the negative electrode pieces separated from the first compound magnetic separation group 2, the second compound magnetic separation group 3 and the third compound magnetic separation group 5; wherein the first direction a is the direction of gravity.

[0043] Specifically, in order to solve the problem that the existing single magnetic roller cannot achieve accurate and efficient sorting, resulting in low sorting accuracy, the positive and negative electrode sheet compound sorting device provided in this embodiment can continuously perform magnetic separation on the material at multiple levels through the first compound magnetic separation group 2, the second compound magnetic separation group 3 and the third compound magnetic separation group 5, which greatly ensures the magnetic separation effect of the material and achieves accurate distinction between the negative electrode sheet and the positive electrode sheet.

[0044] Among them, the positive and negative electrode sheet compound separation device provided in this embodiment is mainly used for the separation of positive and negative electrode sheets in lithium batteries. The device body 1 is a general term for the positive and negative electrode sheet separation device, the first compound magnetic separation group 2 and the second compound magnetic separation group 3 are both located inside the device body 1, and the second compound magnetic separation group 3 is connected to the third compound magnetic separation group 5 through the first conduit 4. It can be understood that the material transported to the device body 1 is first magnetically separated by the first compound magnetic separation group 2, and the unselected pairs fall to the second compound magnetic separation group 3 and the third compound magnetic separation group 5 in turn. The material will undergo three compound magnetic separations to ensure the effect of magnetic separation; the positive electrode pipe 6 and the negative electrode pipe 7 are used to collect the corresponding positive electrode sheets and negative electrode sheets. It can be understood that the positive electrode pipe 6 and the negative electrode pipe are both connected to the first compound magnetic separation group 2, the second compound magnetic separation group 3 and the third compound magnetic separation group 5, and finally the positive electrode sheets and negative electrode sheets are centrally processed.

[0045] The term "and / or" in this article is merely a description of the association relationship of associated objects, identifying three possible relationships. For example, A and / or B is specifically understood as: A and B can be included at the same time, A can exist alone, or B can exist alone, and any of the above three situations can be met.

[0046] In some embodiments, refer to the attached Figure 1 and attached Figure 2 The present embodiment provides a positive and negative electrode sheet compound separation device. In a specific implementation, the first compound magnetic separation group 2 includes a first magnetic roller belt 21, a first magnetic roller 22, and a second conduit 23; the first magnetic roller belt 21 extends along the second direction b to absorb the positive electrode sheet and transport the negative electrode sheet. The end of the first magnetic roller belt 21 is connected to the second conduit 23, and the other end of the second conduit 23 is connected to the first magnetic roller 22 to magnetically separate the positive and negative electrode sheets again. The first magnetic roller 22 extends along the second direction b, and the first magnetic roller 22 is spaced relative to the first magnetic roller belt 21 along the first direction a. The other end of the first magnetic roller 22 is respectively connected to the positive electrode pipeline 6 and the negative electrode pipeline 7; wherein the second direction b is perpendicular to the first direction a and perpendicular to the transport direction of the positive and negative electrode sheets.

[0047] Specifically, in order to achieve efficient screening of positive and negative electrode sheets, the first compound magnetic separation group 2 in this embodiment includes a first magnetic roller belt 21, a first magnetic roller 22 and a second conduit 23, wherein the first magnetic roller belt 21 is a magnetic transmission belt that can adsorb the positive electrode sheet, and the second conduit 23 connects the first magnetic roller belt 21 and the first magnetic roller 22, and can perform secondary magnetic separation on the negative electrode sheet. At the same time, the first magnetic roller 22 is provided with a brush, which can separate the positive electrode sheet adsorbed on the first magnetic roller 22, and then complete the transportation through the positive electrode pipeline 6, completing multiple screening of the material. Magnetic separation: It is understandable that although the belt-type magnetic separation roller can realize the transportation of the positive and negative electrode mixed sheets, due to the magnetic isolation effect of the belt thickness, the magnetic field strength on the belt surface is more than 3000GS lower than the magnetic field strength on the exposed magnetic roller surface. Since the magnetic field strength of the permanent magnet is limited, the maximum is 15000GS. Therefore, only using conventional belt-type magnetic rollers to sort out weakly magnetic positive electrode sheets from the positive and negative electrode mixed sheets cannot meet the requirements. It is necessary to cooperate with the selection of magnetic rollers to achieve the accuracy of positive electrode sheet sorting rate ≥98%.

[0048] In some embodiments, refer to the attached Figure 1 and attached Figure 2 , the positive and negative electrode sheet compound separation device provided in this embodiment, in a specific implementation, the second compound magnetic separation group 3 includes a second magnetic roller belt 31, a second magnetic roller 32, a third conduit 33 and a fourth conduit 34; the second magnetic roller belt 31 overlaps with the projection portion of the first magnetic roller belt 21 along the first direction a to receive the positive and negative electrode sheets after magnetic separation, the ends of the second magnetic roller 32 belt 31 are respectively connected with the third conduit 33 and the fourth conduit 34, the other end of the third conduit 33 is connected with the second magnetic roller 32 to magnetically separate the positive and negative electrode sheets again, the other end of the fourth conduit 34 is connected with the third compound magnetic separation group 5, the second magnetic roller 32 is spaced relative to the second magnetic roller belt 31 along the first direction a, and the side of the second magnetic roller 32 away from the third conduit 33 is respectively connected with the positive electrode conduit 6 and the negative electrode conduit 7;

[0049] The third compound magnetic separation group 5 includes a third magnetic roller 51, a fourth magnetic roller 52 and a fifth guide tube 53; the third magnetic roller 51 and the fourth magnetic roller 52 are spaced apart along the first direction a, the fifth guide tube 53 is used to connect the third magnetic roller 51 and the fourth magnetic roller 52, and the side of the fourth magnetic roller 52 facing away from the third magnetic roller 51 is respectively connected to the positive electrode pipeline 6 and the negative electrode pipeline 7; wherein, the second magnetic roller 32, the third magnetic roller 51 and the fourth magnetic roller 52 have the same structure as the first magnetic roller 22.

[0050] Specifically, in order to ensure the magnetic separation effect on the positive and negative electrode sheets, in this embodiment, the second compound magnetic separation group 3 includes a second magnetic roller belt 31, a second magnetic roller 32, a third conduit 33 and a fourth conduit 34, wherein the second magnetic roller belt 31 has the same structural function as the first magnetic roller 22 belt 21, and the ends of the second magnetic roller belt 31 are respectively connected to the third conduit 33 and the fourth conduit 34, and the third conduit 33 is connected to the second magnetic roller 32, so that the material can be magnetically separated again to ensure the effect of magnetic separation. At the same time, the positive and negative electrode sheets after magnetic separation by the second magnetic roller 32 are respectively transported to the positive electrode pipeline 6 and the negative electrode pipeline 7 for collection, and the fourth conduit 34 can transport the material to the third compound magnetic separation group. The magnetic separation group 5 includes a third magnetic roller 51, a fourth magnetic roller 52 and a fifth conduit 53. The fifth conduit 53 connects the third magnetic roller 51 and the fourth magnetic roller 52. The fourth magnetic roller 52 is connected to the positive electrode pipeline 6 and the negative electrode pipeline 7. It can be understood that the third magnetic roller 51 and the fourth magnetic roller 52 can perform multiple strong magnetic separations on the material to ensure the distinction between the positive and negative electrode sheets. Therefore, the positive and negative electrode sheets finally magnetically separated by the fourth magnetic roller 52 will be passed into the corresponding pipelines for unified collection. At the same time, the second magnetic roller 32, the third magnetic roller 51 and the fourth magnetic roller 52 have the same structure as the first magnetic roller 22 and are all provided with brushes to brush out the electrode sheets.

[0051] In some embodiments, refer to the attached Figure 1 and attached Figure 2 In the positive and negative electrode sheet duplex sorting device provided in this embodiment, in a specific implementation, the third magnetic roller 51 and the second magnetic roller 32 are spaced apart along the second direction b to avoid mutual influence of magnetic attraction.

[0052] Specifically, in order to avoid mutual influence between the magnetic rollers, in the present embodiment, the third magnetic roller 51 and the second magnetic roller 32 are spaced apart along the second direction b. It can be understood that both the third magnetic roller 51 and the second magnetic roller 32 have strong magnetism. If the distance between the two is too close, their respective magnetism will be affected, thereby making it impossible to accurately perform magnetic separation.

[0053] In some embodiments, refer to the attached Figure 2 In the positive and negative electrode sheet duplex sorting device provided in this embodiment, in a specific implementation, the position of the fourth magnetic roller 52 is offset toward the side of the third magnetic roller 51 away from the second magnetic roller 32 .

[0054] Specifically, in order to smoothly convey the material, in the present embodiment, the position of the fourth magnetic roller 52 is offset toward the side of the third magnetic roller 51 away from the second magnetic roller 32. It can be understood that after the material is magnetically separated by the third magnetic roller 51, it needs to be magnetically separated again by the fourth magnetic roller 52. Therefore, the offset of the fourth magnetic roller 52 relative to the third magnetic roller 51 helps the transfer of the material and avoids the mutual vertical action between the magnetic rollers, thereby ensuring the effect of magnetic separation.

[0055] In some embodiments, refer to the attached Figure 2In the positive and negative electrode sheet compound sorting device provided in this embodiment, in a specific implementation, a receiving hopper 8 is provided between the fourth magnetic roller 52 and the negative electrode pipe 7. There are two receiving hoppers 8, and the two receiving hoppers 8 are arranged at intervals along the second direction b to increase the conveying capacity of the negative electrode sheets.

[0056] Specifically, in order to ensure the conveying efficiency of the negative electrode sheets, in the present embodiment, a receiving hopper 8 is provided between the fourth magnetic roller 52 and the negative electrode pipe 7. There are two receiving hoppers 8. It can be understood that a large number of negative electrode sheets will be generated after the entire magnetic separation process, so two spaced-apart receiving hoppers 8 are required to receive the negative electrode sheets on the fourth magnetic roller 52 to ensure stable and efficient conveying of the negative electrode sheets.

[0057] Embodiment 2

[0058] This embodiment provides a sorting system, which includes at least one positive and negative electrode sheet compound sorting device. Specifically, the positive and negative electrode sheet compound sorting device is the positive and negative electrode sheet compound sorting device of embodiment 1. Please refer to the description of embodiment 1 for its specific structure and working principle, and no further elaboration is given here.

[0059] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0060] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A multi-stage compound sorting device for positive and negative electrode sheets, characterized in that: include: Device body (1), a first compound magnetic separation group (2), the first compound magnetic separation group (2) being located inside the device body (1) to collect and magnetically separate the positive and negative electrode sheets transported to the device body (1); a second compound magnetic separation group (3), wherein the projection of the second compound magnetic separation group (3) along the first direction overlaps with that of the first compound magnetic separation group (2) so as to perform secondary magnetic separation on the positive and negative pole pieces, and the second compound magnetic separation group (3) is spaced apart from the first compound magnetic separation group (2) along the first direction; A first conduit (4), wherein a feed end of the first conduit (4) is connected to the second compound magnetic separation group (3) to collect the positive and negative electrode sheets that have not been magnetically separated; a third compound magnetic separation group (5), the third compound magnetic separation group (5) being connected to the discharge end of the first conduit (4), the third compound magnetic separation group (5) being spaced apart from the second compound magnetic separation group (3) along the first direction; A positive electrode pipeline (6), the positive electrode pipeline (6) is used to collect the positive electrode sheets separated in the first compound magnetic separation group (2), the second compound magnetic separation group (3) and the third compound magnetic separation group (5); a negative electrode pipeline (7), the negative electrode pipeline (7) being used to collect the negative electrode sheets separated from the first compound magnetic separation group (2), the second compound magnetic separation group (3) and the third compound magnetic separation group (5); Wherein, the first direction is the direction of gravity.

2. A positive and negative electrode multi-stage compound separation device according to claim 1, characterized in that: The first compound magnetic separation group (2) comprises a first magnetic roller belt (21), a first magnetic roller (22), and a second guide tube (23); The first magnetic roller belt (21) extends along the second direction to absorb the positive electrode sheet and transport the negative electrode sheet. The end of the first magnetic roller belt (21) is connected to the second conduit (23). The other end of the second conduit (23) is connected to the first magnetic roller (22) to magnetically separate the positive and negative electrode sheets again. The first magnetic roller (22) extends along the second direction. The first magnetic rollers (22) are spaced apart relative to the first magnetic roller belt (21) along the first direction. The other end of the first magnetic roller (22) is respectively connected to the positive electrode pipeline (6) and the negative electrode pipeline (7). The second direction is perpendicular to the first direction and perpendicular to the conveying direction of the positive and negative electrode sheets.

3. A positive and negative electrode multi-stage compound separation device according to claim 2, characterized in that: The second compound magnetic separation group (3) comprises a second magnetic roller belt (31), a second magnetic roller (32), a third conduit (33) and a fourth conduit (34); The second magnetic roller belt (31) overlaps with the projection of the first magnetic roller belt (21) along the first direction to receive the positive and negative pole pieces after magnetic separation. The ends of the second magnetic roller belt (31) are respectively connected to the third conduit (33) and the fourth conduit (34). The other end of the third conduit (33) is connected to the second magnetic roller (32) to magnetically separate the positive and negative pole pieces again. The other end of the fourth conduit (34) is connected to the third compound magnetic separation group (5). The second magnetic rollers (32) are spaced apart along the first direction relative to the second magnetic roller belt (31). The side of the second magnetic roller (32) facing away from the third conduit (33) is respectively connected to the positive pole pipe (6) and the negative pole pipe (7). The third compound magnetic separation group (5) comprises a third magnetic roller (51), a fourth magnetic roller (52) and a fifth guide tube (53); The third magnetic roller (51) and the fourth magnetic roller (52) are spaced apart along the first direction, the fifth conduit (53) is used to connect the third magnetic roller (51) and the fourth magnetic roller (52), and the side of the fourth magnetic roller (52) facing away from the third magnetic roller (51) is respectively connected to the positive electrode pipeline (6) and the negative electrode pipeline (7); The second magnetic roller (32), the third magnetic roller (51) and the fourth magnetic roller (52) have the same structure as the first magnetic roller (22).

4. A positive and negative electrode multi-stage compound separation device according to claim 3, characterized in that: The third magnetic roller (51) and the second magnetic roller (32) are arranged at intervals along the second direction to avoid mutual influence of magnetic attraction forces.

5. The positive and negative electrode multi-stage compound separation device according to claim 3 is characterized in that: The position of the fourth magnetic roller (52) is offset toward a side of the third magnetic roller (51) away from the second magnetic roller (32).

6. The positive and negative electrode multi-stage compound separation device according to claim 3 is characterized in that: A receiving hopper (8) is provided between the fourth magnetic roller (52) and the negative electrode pipeline (7), and there are two receiving hoppers (8). The two receiving hoppers (8) are arranged at intervals along the second direction to increase the conveying capacity of the negative electrode sheets.

7. A sorting system, characterized in that: It includes: At least the multi-stage compound sorting device for positive and negative electrode sheets as described in any one of claims 1-6.

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