Lithium battery electrolyte drying device

Abstract

The utility model relates to a lithium battery electrolyte drying device, and belongs to the technical field of lithium battery recycling. The shielding gas supply part is arranged at the bottom of the drying box body; the protective gas heating part is arranged on the side wall of the drying box body and communicates with the protective gas supply part and the drying box body; the conveying belt assembly is arranged in the drying box body; and the distribution assembly is arranged above the conveying belt assembly. According to the lithium battery electrode slice drying device, the interior of the drying box body is heated through shielding gas, the lithium battery electrode slices on the conveying belt assembly are evenly spread through the distribution assembly, and then electrolyte in the lithium battery electrode slices is dried under the condition that the integrity of the electrode slices is not damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery recycling, in particular to a lithium battery electrolyte drying device. Background Art

[0002] Lithium batteries have become the main energy source for new energy vehicles due to their advantages such as no memory effect, light weight and better discharge performance. With the popularization of new energy vehicles, they are being used on a large scale. However, due to the limited cycle life of lithium batteries, new energy vehicles need to replace lithium batteries regularly, which makes a large number of lithium batteries face the problem of scrapping and recycling. The lithium batteries used in existing new energy vehicles are generally composed of a shell, a positive electrode, a negative electrode, an electrolyte and a diaphragm. The positive and negative electrodes often have a high recycling value, while the economic value of the electrolyte is low and it contains toxic solutions. This has led to the relatively backward drying device of the electrolyte in lithium batteries.

[0003] There are generally two types of drying devices for lithium battery electrolytes. The first type is to first crush the lithium battery as a whole, and then heat and dry the crushed materials; the second type is to first disassemble the lithium battery, and then thermally crack the battery cells in the disassembled lithium battery, and then crush the solid materials obtained by thermal cracking to recover the precious metals. It can be seen that the drying device for lithium battery electrolytes in the prior art is only a heating device that provides different temperatures, but it cannot protect the integrity of the appearance of the electrode sheets in the lithium battery, which creates great difficulties for the subsequent separation of the positive and negative electrode sheets.

[0004] Therefore, in view of the technical problems existing in the above-mentioned prior art, the utility model provides a lithium battery electrolyte drying device. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides an electrolyte drying device for lithium battery electrode sheets, which solves the technical problem in the prior art that the electrolyte of the lithium battery electrode sheets cannot protect the integrity of their appearance during the drying process, which causes great difficulties in the subsequent separation between the positive electrode sheets and the negative electrode sheets.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0009] The utility model discloses an electrolyte drying device, comprising: a drying box; a protective gas supply component arranged at the bottom of the drying box; a protective gas heating component arranged at the side wall of the drying box and connected with the protective gas supply component and the drying box; a conveyor belt assembly arranged inside the drying box; and a distribution assembly arranged above the conveyor belt assembly.

[0010] Optionally, the distribution assembly includes: a first distribution member, which is arranged above the conveyor belt assembly and moves back and forth along the first direction; and a second distribution member, which is arranged above the conveyor belt assembly and moves back and forth along the second direction.

[0011] Optionally, the first dividing member and the second dividing member further include dividing teeth, which are arranged on the sides of the first dividing member and the second dividing member facing the conveyor belt assembly.

[0012] Optionally, a plurality of shifting teeth are provided, and the spacing between the plurality of shifting teeth is greater than the size of the electrode sheet.

[0013] Optionally, the conveyor belt assembly includes multiple layers of conveyor belts, which are arranged from top to bottom, and along a direction perpendicular to the multiple layers of conveyor belts, the distance between each two adjacent layers of conveyor belts is 240 mm to 280 mm.

[0014] Optionally, in each of two adjacent layers of conveyor belts, the distance in the horizontal direction between the conveying end of the upper conveyor belt and the conveying starting end of the lower conveyor belt is 280 to 320 mm.

[0015] Optionally, a material blocking plate is arranged above the conveying starting end of the lower conveyor belt in each of two adjacent conveyor belts.

[0016] Optionally, the angle between the baffle plate and the vertical direction is 25-35°.

[0017] Optionally, the steam recovery pipeline is arranged above the drying box body; and the electrode sheet discharge port is arranged at the bottom of the side of the drying box body.

[0018] Optionally, an explosion-proof valve is provided on the top of the drying box.

[0019] (III) Beneficial effects

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides a lithium battery electrolyte drying device, which includes: a drying box; a protective gas supply component, which is arranged at the bottom of the drying box; a protective gas heating component, which is arranged on the side wall of the drying box and is connected with the protective gas supply component and the drying box; a conveyor belt assembly, which is arranged inside the drying box; and a distribution component, which is arranged above the conveyor belt assembly. The utility model heats the inside of the drying box with protective gas to ensure the safety of the electrolyte, and evenly spreads the lithium battery electrode sheets on the conveyor belt assembly through the distribution component, and by setting the conveyor belt assembly, the evenly spread lithium battery electrode sheets are continuously heated by the protective gas during the conveying process, thereby drying the electrolyte in the lithium battery electrode sheets without destroying the integrity of the electrode sheets.

[0022] Furthermore, the distribution component includes a first distribution component and a second distribution component, and the two distribution components are both arranged above the conveyor belt component. During the drying process, the lithium battery electrode sheets conveyed on the conveyor belt component are distributed, and the first distribution component and the second distribution component are both reciprocatingly moved, so that the lithium battery electrode sheets on the conveyor belt component can be repeatedly distributed, thereby increasing the distribution effect, and the reciprocating directions of the first distribution component and the second distribution component are different, thereby further increasing the distribution effect, and finally the lithium battery electrode sheets on the conveyor belt component are evenly distributed and flatly spread on the conveyor belt component, thereby increasing the drying area of ​​the lithium battery electrode sheets on the conveyor belt component and ensuring the drying effect.

[0023] Furthermore, the arrangement of the shifting teeth enables the first shifting member and the second shifting member to shift the lithium battery electrode sheets back and forth in the gaps between the individual lithium battery electrode sheets, since the lithium battery electrode sheets are scattered on the transmission belt assembly, through the shifting teeth, that is, to shift from the periphery of the lithium battery electrode sheets, thereby not causing any damage to the appearance of the lithium battery electrode sheets.

[0024] Furthermore, since the multi-layer conveyor belts are arranged from top to bottom and the distance between each two adjacent layers of conveyor belts is set to 240mm to 280mm in a direction perpendicular to the multi-layer conveyor belts, such a distance setting ensures that when the lithium battery electrode sheets fall from the upper layer of conveyor belt to the adjacent lower layer of conveyor belt, the shape of the lithium battery electrode sheets will not be destroyed due to the influence of their own weight and the conveyor belt speed, thereby ensuring the integrity of the shape of the lithium battery electrode sheets.

[0025] Furthermore, in every two adjacent layers of conveyor belts, the horizontal distance between the conveying end of the upper conveyor belt and the conveying starting end of the lower conveyor belt is 280mm to 320mm. By setting such a distance, the lower conveyor belt in the adjacent conveyor belts can catch the lithium battery electrode sheets falling from the upper conveyor belt, thereby ensuring that the lithium battery electrode sheets are conveyed to each other between the multiple layers of conveyor belts, thereby increasing the drying time of the lithium battery electrode sheets inside the drying box, and ensuring the drying effect of the lithium battery electrode sheets.

[0026] Furthermore, a baffle plate is arranged in each of two adjacent conveyor belts, above the conveying starting end of the lower conveyor belt. The baffle plate ensures that the lithium battery electrode sheets conveyed by the upper conveyor belt only fall onto the lower conveyor belt, and will not fall to the outside of the lower conveyor belt due to excessively fast conveying speed, thereby ensuring the conveying effect of the lithium battery electrode sheets between the multiple conveyor belts, and ultimately ensuring the drying time and drying effect of the lithium battery electrode sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the lithium battery electrolyte drying device of the utility model;

[0028] Figure 2 This is a structural schematic diagram of a lithium battery electrolyte drying device from another angle of the present invention;

[0029] Figure 3 This is a structural schematic diagram of a lithium battery electrolyte drying device from another angle of the utility model;

[0030] Figure 4 The utility model is a lithium battery electrolyte drying device. Figure 3 The enlarged schematic diagram of point A in the middle;

[0031] Figure 5 It is a structural schematic diagram of the first distribution member of the utility model;

[0032] Figure 6 It is a structural schematic diagram of the second distribution member of the utility model.

[0033] [Description of Reference Numerals]

[0034] 1. Drying box; 2. Electrode sheet feeding port; 3. Shielding gas supply component; 4. Shielding gas heating component; 5. Conveyor belt assembly; 6. Dividing assembly; 7. First diverting component; 8. Second diverting component; 9. Dividing teeth; 10. Baffle plate; 11. Steam recovery pipeline; 12. Electrode sheet discharge port; 13. Explosion-proof valve; 14. Inspection window. DETAILED DESCRIPTION

[0035] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0036] The utility model provides a lithium battery electrolyte drying device, comprising: a drying box body; a protective gas supply component, which is arranged at the bottom of the drying box body; a protective gas heating component, which is arranged on the side wall of the drying box body and is connected with the protective gas supply component and the drying box body; a conveyor belt assembly, which is arranged inside the drying box body; and a distribution assembly, which is arranged above the conveyor belt assembly.

[0037] The utility model heats the interior of the drying box body by protective gas, thereby ensuring the safety of the electrolyte in the lithium battery electrode sheets during the heating process, and evenly spreads the lithium battery electrode sheets on the conveyor belt assembly by means of a distribution component, thereby increasing the drying area, and by providing a conveyor belt assembly, the evenly spread lithium battery electrode sheets are continuously heated by the protective gas during the conveying process, thereby increasing the drying time, and thus drying the electrolyte in the lithium battery electrode sheets without destroying the appearance integrity of the lithium battery electrode sheets.

[0038] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] Example:

[0040] The present invention provides a lithium battery electrolyte drying device. Figures 1 to 6 As shown, the lithium battery electrolyte drying device comprises: a drying box 1, a protective gas supply component 3, a protective gas heating component 4, a conveyor belt assembly 5 and a distribution component 6. The interior of the drying box 1 is heated by the protective gas, and the lithium battery electrode sheets on the conveyor belt assembly 5 are evenly spread by the distribution component 6, thereby drying the electrolyte in the electrode sheets without destroying the integrity of the lithium battery electrode sheets.

[0041] The structural form of the drying box 1, the protective gas supply component 3, the protective gas heating component 4, the conveyor belt component 5 and the distribution component 6 can be one of the following forms:

[0042] Structural form 1: The drying box 1 is provided with an electrode sheet feed port 2 and an electrode sheet discharge port 12. The electrode sheet feed port 2 is provided at the upper part of the first end of the drying box 1, and the electrode sheet discharge port 12 is provided at the lower part of the second end of the drying box 1. This arrangement facilitates the connection between the drying box 1 and the upstream and downstream devices of the lithium battery electrode sheet separation production line, which is beneficial to the continuous operation of the production line. Since the conveying directions of each two adjacent layers of conveyor belts are opposite, in this case, it is necessary to set the number of conveyor belt layers in the conveyor belt assembly 5 to an odd number, so that the lithium battery electrode sheet with electrolyte enters from the first end of the drying box 1, and finally after drying, the dried lithium battery electrode sheet is discharged from the electrode sheet discharge port 12 at the second end of the drying box 1. The shielding gas supply component 3 is arranged on one side of the bottom of the drying box 1, that is, on the side close to the electrode sheet discharge port 12. The shielding gas can be nitrogen, and the nitrogen is heated by the shielding gas heating component 4 on the side wall. The heated nitrogen enters the drying box 1 through the connecting pipeline, thereby protecting the safety of the drying box 1 during the drying process of the lithium battery electrode sheet. According to the size of the space of the drying box 1, in order to increase the drying effect, the number of shielding gas supply components 3 and shielding gas heating components 4 can be increased, and because the heated gas has a lower relative density and lighter mass due to the molecular thermal motion, it is easier to move upward. Therefore, the shielding gas heating component 4 is arranged at the bottom of the side wall of the drying box 1, thereby more reasonably distributing heat energy and saving energy. The distribution component 6 is arranged above the conveyor belt component 5 and can be connected to the top wall of the drying box 1 to distribute the lithium battery electrode sheets on the uppermost conveyor belt, thereby ensuring that the lithium battery electrode sheets on the uppermost conveyor belt are evenly spread, thereby increasing the drying heating area of ​​the lithium battery electrode sheets and ensuring the drying effect of the lithium battery electrode sheets.

[0043] Structural form II: The drying box 1 is provided with an electrode sheet feed port 2 and an electrode sheet discharge port 12. The electrode sheet feed port 2 is provided at the upper part of the first end of the drying box 1, and the electrode sheet discharge port 12 is provided at the lower part of the first end of the drying box 1. This arrangement reduces the floor space occupied by the drying box 1 after being connected to the upstream and downstream devices of the lithium battery electrode sheet separation production line. The upstream device can be provided above the downstream device, making full use of the plant space height of the production line. Since the conveying directions of each adjacent two layers of conveyor belts are opposite, in this case, it is necessary to set the number of conveyor belt layers in the conveyor belt assembly 5 to be an even number, so that the lithium battery electrode sheets with electrolyte enter from the first end of the drying box 1, and finally after drying, the dried lithium battery electrode sheets are discharged from the electrode sheet discharge port 12 at the first end of the drying box 1. The shielding gas supply component 3 is arranged in the middle position of the bottom of the drying box 1. The shielding gas can be nitrogen, and the nitrogen is heated by the shielding gas heating component 4 on the side wall. The heated nitrogen enters the drying box 1 from the middle position through the connecting pipeline. Due to the central position, the time for the heated nitrogen to be dispersed to both sides is the same, which effectively reduces the heat loss, thereby ensuring the drying temperature of the drying box 1 for the lithium battery electrode sheet and saving energy.

[0044] Further, such as Figure 1 and Figure 2 As shown, the first dividing member 7 is arranged at a position relatively close to the electrode sheet feeding port 2, and moves back and forth along the direction perpendicular to the conveying direction of the conveyor belt. The first dividing member 7 is a flat dividing member, and the second dividing member 8 is arranged at a position relatively far away from the electrode sheet feeding port 2, and moves back and forth along the conveying direction of the conveyor belt. The second dividing member 8 is a rolling dividing member, thereby ensuring that the first dividing member 7 and the second dividing member 8 divide the lithium battery electrode sheets on the conveying belt in two different directions, so that the lithium battery electrode sheets are evenly spread on the conveying belt, thereby ensuring the dividing effect, so that the drying area of ​​the lithium battery electrode sheets on the conveyor belt is maximized.

[0045] Further, such as Figure 5 As shown, the dividing teeth 9 are cylindrical teeth. During the process of the first dividing member 7 and the second dividing member 8 dividing the lithium battery electrode sheets on the conveyor belt assembly 5, the shape of the electrode sheets will not be damaged due to contact with the electrode sheets, thereby ensuring the integrity of the electrode sheets and facilitating the effective separation of the positive and negative electrode sheets in the later stage.

[0046] Further, such as Figure 5 As shown, the number of the dividing teeth 9 can be set according to the actual situation, and can be arranged in rows or staggered. However, the distance between adjacent dividing teeth 9 should be determined according to the size of the electrode sheet and should be larger than the size of the electrode sheet, thereby preventing the electrode sheet from being stuck by the dividing teeth 9, thereby ensuring the integrity of the shape of the electrode sheet.

[0047] For example, Figure 6 As shown, the dividing teeth 9 of the second dividing member 8 are in the form of a sheet. The dividing teeth 9 in the form of a sheet cooperate with the rotating movement dividing mode to have a larger dividing area, thereby quickly and evenly dividing the electrode sheets, so that the electrode sheets are spread out on the transmission belt assembly 5 .

[0048] Further, such as Figure 3 As shown, the conveyor belt assembly 5 includes multiple layers of conveyor belts, which are arranged from top to bottom, and along a direction perpendicular to the multiple layers of conveyor belts, the distance between each two adjacent layers of conveyor belts is 240 mm.

[0049] Exemplarily, the distance between each two adjacent layers of conveyor belts is 260 mm.

[0050] Exemplarily, the distance between each two adjacent layers of conveyor belts is 280 mm.

[0051] Further, such as Figure 5 As shown, in each adjacent two layers of conveyor belts, the distance between the conveying end of the upper conveyor belt and the conveying starting end of the lower conveyor belt in the horizontal direction is 280 mm. This arrangement enables the lower conveyor belt to receive the lithium battery electrode sheets dropped from the upper conveyor belt.

[0052] Exemplarily, the horizontal distance between the conveying end of the upper conveyor belt and the conveying starting end of the lower conveyor belt is 300 mm, so that the effective area of ​​the lower conveyor belt connected to the upper conveyor belt for conveying the falling lithium battery electrode sheets is increased.

[0053] Exemplarily, the horizontal distance between the conveying end of the upper conveyor belt and the conveying starting end of the lower conveyor belt is 320 mm, so that the effective area of ​​the lower conveyor belt connected to the upper conveyor belt for conveying the falling lithium battery electrode sheets is increased.

[0054] Further, such as Figure 3 and Figure 4 As shown, the baffle plate 10 is arranged in each of two adjacent conveyor belts, above the conveying starting end of the lower conveyor belt. Since the conveyor belt has a certain conveying speed during the conveying process, the conveyed lithium battery electrode sheet falls to the outside of the lower conveyor belt. Therefore, the baffle plate 10 is set to effectively prevent the occurrence of the above situation.

[0055] Furthermore, the angle between the baffle plate 10 and the vertical direction is 25°. This arrangement increases the range of the baffle plate 10 to block the lithium battery electrode sheets falling from the upper conveyor belt, thereby ensuring that the lithium battery electrode sheets falling from the upper conveyor belt can fall on the lower conveyor belt.

[0056] Exemplarily, the angle between the baffle plate 10 and the vertical direction is 30°, which further increases the range of the baffle plate 10 to block the lithium battery electrode sheets falling from the upper conveyor belt.

[0057] Exemplarily, the angle between the baffle plate 10 and the vertical direction is 35°, which further increases the range of the baffle plate 10 to block the lithium battery electrode sheets falling from the upper conveyor belt.

[0058] Further, such as Figure 1 and Figure 2 As shown, the steam recovery pipe 11 is arranged above the drying box 1, so that the electrolyte vapor obtained by drying and heating the lithium battery electrode sheets can be effectively recovered, ensuring green environmental protection.

[0059] Further, such as Figure 1 As shown, the explosion-proof valve 13 is arranged at the top of the drying box 1, which ensures the safety during the drying process of the electrolyte of the lithium battery electrode sheet. Even if the temperature is over-temperature, the explosion-proof valve 13 can be broken in time to ensure the safe operation of the drying box 1. And the number of explosion-proof valves 13 can be determined according to the actual volume of the drying box 1, and the specific number is not limited here.

[0060] Further, such as Figure 2 As shown, the side wall of the drying box 1 is also provided with an inspection window 14, which can be opened outward relative to the inside of the drying box 1, so that various components inside the drying box 1 can be regularly inspected and maintained, and the conveyor belt assembly 5, the distribution assembly 6 and other components inside the drying box 1 are convenient for inspection and maintenance, thereby ensuring the safe and stable operation of the electrolyte drying device for the lithium battery electrode sheet. The specific number of inspection windows 14 can be determined according to the actual volume of the drying box 1, and is not specifically limited here.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A lithium battery electrolyte drying device, characterized in that: include: Drying box; A protective gas supply component is arranged at the bottom of the drying box; A protective gas heating component is arranged on the side wall of the drying box and is connected to the protective gas supply component and the drying box; A conveyor belt assembly is arranged inside the drying box; The distribution assembly is arranged above the conveyor belt assembly.

2. The lithium battery electrolyte drying device according to claim 1, characterized in that: The distribution assembly comprises: A first distribution member is disposed above the conveyor belt assembly and reciprocates along a first direction; The second distributing member is disposed above the conveyor belt assembly and reciprocates along the second direction.

3. The lithium battery electrolyte drying device according to claim 2, characterized in that: The first distribution member and the second distribution member further include: The shifting teeth are arranged on the side surfaces of the first shifting member and the second shifting member facing the conveyor belt assembly.

4. The lithium battery electrolyte drying device according to claim 3, characterized in that: There are a plurality of the shifting teeth, and the spacing between the plurality of the shifting teeth is greater than the size of the electrode sheet.

5. The lithium battery electrolyte drying device according to claim 1, characterized in that: The conveyor belt assembly includes multiple layers of conveyor belts, which are arranged from top to bottom, and along a direction perpendicular to the multiple layers of conveyor belts, the distance between each two adjacent layers of conveyor belts is 240 mm to 280 mm.

6. The lithium battery electrolyte drying device according to claim 5, characterized in that: In each of the two adjacent layers of conveyor belts, the distance in the horizontal direction between the conveying end of the upper conveyor belt and the conveying starting end of the lower conveyor belt is 280 mm to 320 mm.

7. The lithium battery electrolyte drying device as described in claim 6, characterized in that: Also includes: The material blocking plate is arranged above the conveying starting end of the lower conveyor belt in each of the two adjacent conveyor belts.

8. The lithium battery electrolyte drying device according to claim 7, characterized in that: Also includes: The included angle between the baffle plate and the vertical direction is 25° to 35°.

9. The lithium battery electrolyte drying device according to claim 1, characterized in that: Also includes: A steam recovery pipeline is arranged above the drying box; The electrode sheet discharge port is arranged at the bottom of the side of the drying box body.

10. The lithium battery electrolyte drying device according to any one of claims 1 to 9, characterized in that: Also includes: An explosion-proof valve is arranged on the top of the drying box.

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