Washing system of ternary positive electrode material

Abstract

The utility model discloses a washing system for a ternary positive electrode material. The washing system comprises a feeding module, a washing module positioned at the downstream of the feeding module, and a filter pressing module positioned at the downstream of the washing module, the washing module comprises a washing tank. The feeding module is used for feeding to-be-washed materials into the washing tank, the washing tank is used for washing the to-be-washed materials to form washing slurry and feeding the washing slurry into the filter pressing module, the washing slurry comprises washed materials and washing liquid, and the filter pressing module is used for separating the washed materials from the washing liquid. The feeding module comprises a material conveying mechanism, a material caching mechanism located on the downstream of the material conveying mechanism and a weight measuring mechanism. The material conveying mechanism is used for putting the to-be-washed materials into the material caching mechanism, and the weight measuring mechanism is used for measuring the weight of the put to-be-washed materials. And when the weight reaches a preset value, the material temporary storage mechanism starts to put the to-be-washed material into the washing tank at one time.

Description

Technical Field

[0001] The utility model relates to the production of ternary positive electrode materials, in particular to a water washing system suitable for high-nickel ternary positive electrode materials. Background Art

[0002] High nickel ternary cathode materials have the advantages of high energy density, high cycle number, high reversible capacity, good low temperature performance, environmental friendliness and abundant raw material sources, and have long-term development prospects. However, high nickel ternary cathode materials will have a high content of LiOH and Li on the surface after sintering. 2 CO 3 Impurities such as alkali residue on the surface can easily cause gas generation in the battery. 2 , CO 2 Water washing is an effective method to reduce the surface impurities of high-nickel ternary cathode materials. However, in the process of washing high-nickel ternary cathode materials, excessive water washing will cause the material to undergo significant Li + / H + Ion exchange leads to a significant increase in the charge exchange impedance of high-nickel ternary cathode materials, a decrease in the capacity of the materials, and a sharp decrease in the cycle life of high-nickel ternary cathode materials. Insufficient water washing leads to a high residual alkali content on the surface of the materials. Traditional water washing systems have the phenomenon of over-washing during the feeding and washing process, and under-washing during the solid-liquid separation process, resulting in unsatisfactory washing effects for high-nickel ternary cathode materials. Utility Model Content

[0003] In view of this, the present application provides a water washing system for a ternary positive electrode material, which can avoid over-washing or under-washing to improve the water washing effect of the ternary positive electrode material.

[0004] To achieve the above-mentioned purpose, the present application provides a water washing system for ternary positive electrode materials, comprising a feeding module, a water washing module located downstream of the feeding module, and a filter press module located downstream of the water washing module, wherein the water washing module comprises a water washing tank. The feeding module is used to feed the material to be washed into the water washing tank, the water washing tank is used to wash the material to be washed to form a water washing slurry and feed the water washing slurry into the filter press module, the water washing slurry comprises washed material and washing liquid, and the filter press module is used to separate the washed material from the washing liquid. The feeding module comprises a material conveying mechanism, a material buffer mechanism located downstream of the material conveying mechanism, and a weight measuring mechanism, the material conveying mechanism is used to feed the material to be washed into the material buffer mechanism, and the weight measuring mechanism is used to measure the weight of the material to be washed that has been fed. The material buffer mechanism feeds the material to be washed into the water washing tank at one time based on the weight.

[0005] In some possible implementations, the weight measurement mechanism includes a weight sensor, which is disposed in the material conveying mechanism or the material buffer mechanism and is used to measure a weight change of the material conveying mechanism or the material buffer mechanism.

[0006] In some possible implementations, the water washing tank is provided with a first discharge end and a second discharge end, the first discharge end remains open to output the water-washed slurry, and the second discharge end is selectively opened or closed.

[0007] In some possible implementations, a flow sensor is provided downstream of the first discharge end, and the flow sensor is used to measure the flow of the water-washed slurry output from the first discharge end. A level sensor is provided in the water washing tank, and the level sensor is used to measure the level of the material to be washed in the water washing tank. The second discharge end is selectively opened or closed based on the flow and the level.

[0008] In some possible implementations, the filter press module includes a material filter press conveying pipeline and a solid-liquid separation mechanism, the material filter press conveying pipeline connects the first discharge end and the second discharge end, the solid-liquid separation mechanism is arranged downstream of the material filter press conveying pipeline, and the solid-liquid separation mechanism is used to intercept the washed material and allow the washing liquid to pass through to form a filtrate.

[0009] In some possible implementations, the filter press module also includes a first storage tank and a second storage tank connected downstream of the solid-liquid separation mechanism, the discharge end of the first storage tank is connected to the feed end of the water washing tank, and the discharge end of the second storage tank is connected to the material filter press conveying pipeline.

[0010] In some possible implementations, the filter press module further includes a third storage tank, wherein the third storage tank is used to buffer pure water, and a discharge end of the third storage tank is connected to the material filter press conveying pipeline.

[0011] In some possible implementations, the water washing system for the ternary positive electrode material further includes a water inlet pipeline connected to the water washing tank or the third storage tank, and the water inlet pipeline is used to provide pure water to the water washing tank or the third storage tank.

[0012] In some possible implementations, the material filter pressing and conveying pipeline is also provided with a demagnetization device.

[0013] In some possible implementations, the material conveying mechanism includes a material receiving bin and a material metering screw, wherein the material receiving bin is disposed upstream of the material metering screw. The material buffer mechanism and the weight measuring mechanism are integrated into one body to form a material metering bin.

[0014] In the present application, by making the same batch of ternary positive electrode materials to be washed complete the metering first, and then put them into the washing tank at the same time, it is beneficial to shorten the time difference between the same batch of materials contacting pure water for washing, and make the same batch of materials start washing under relatively consistent solid-liquid ratio conditions, so that the washing solid-liquid ratio of the same batch of materials can be more accurately controlled, thereby significantly improving the washing consistency of the same batch of ternary positive electrode materials to be washed, and improving the washing effect. In addition, by setting a spare washing discharge end, the ternary positive electrode material is avoided from being retained in the washing tank and causing over-washing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a water washing system provided for some embodiments of the present application.

[0016] Main component symbols

[0017] Water washing system 1000

[0018] Feeding module 100

[0019] Material conveying mechanism 110

[0020] Material receiving warehouse 111

[0021] Material metering screw 112

[0022] Material caching mechanism 120

[0023] Weight measuring mechanism 130

[0024] Washing module 200

[0025] Washing tank 210

[0026] First discharging end 211

[0027] Second discharging end 212

[0028] Filter Press Module 300

[0029] Material filter press conveying pipeline 310

[0030] Demagnetization device 311

[0031] Feed pump 312

[0032] Solid-liquid separation mechanism 320

[0033] First downstream branch 321

[0034] Second downstream branch 322

[0035] First storage tank 330

[0036] Second storage tank 340

[0037] The third storage tank 350

[0038] First connecting valve 1

[0039] Second connecting valve 2

[0040] The third connecting valve 3

[0041] Fourth connecting valve 4

[0042] Fifth connecting valve 5

[0043] Sixth connecting valve 6

[0044] Seventh connecting valve 7

[0045] Eighth connecting valve 8

[0046] Ninth connecting valve 9

[0047] Tenth connecting valve 10

[0048] The eleventh connecting valve 11

[0049] The twelfth connecting valve 12

[0050] Thirteenth connecting valve 13

[0051] Fourteenth connecting valve 14

[0052] Fifteenth connecting valve 15

[0053] Water inlet pipe 16 DETAILED DESCRIPTION

[0054] The embodiments of the present application are described in detail below. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application; it should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present application; in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other; many specific details are elaborated in the following description to facilitate a full understanding of the present application, and the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0055] In the embodiments of the present application, for the convenience of description and not to limit the present application, the term "connection" used in the patent application specification and claims of the present application is not limited to physical or mechanical connection, whether direct or indirect. "Up", "down", "above", "below", "left", "right", etc. are only used to indicate relative position relationship. When the absolute position of the described object changes, the relative position relationship also changes accordingly.

[0056] See also Figure 1 , an embodiment of the present application provides a water washing system 1000 for a ternary positive electrode material, which is suitable for washing the ternary positive electrode material (especially the high nickel ternary positive electrode material) after sintering. The water washing system 1000 includes a feeding module 100, a water washing module 200 and a filter press module 300, wherein the water washing module 200 is arranged downstream of the feeding module 100, and the filter press module 300 is arranged downstream of the water washing module 200. The water washing module 200 includes a water washing tank 210. The feeding module 100 is used to put the material to be washed (i.e., the ternary positive electrode material to be washed after sintering) into the water washing tank 210, and the material to be washed is at least partially washed in the water washing tank 210 to form a water washing slurry, and the water washing slurry includes the washed material and the washing liquid, and the washed slurry of the water washing module 200 is put into the filter press module 300, and the filter press module 300 separates the washed material and the washing liquid.

[0057] The feeding module 100 includes a material conveying mechanism 110, a material buffer mechanism 120 and a weight measuring mechanism 130. The material conveying mechanism 110 is used to feed the material to be washed into the material buffer mechanism 120, and the weight measuring mechanism 130 is used to measure the weight of the material to be washed. When the weight reaches a preset value, the material conveying mechanism 110 stops feeding the material to the material buffer mechanism 120, and the material buffer mechanism 120 starts feeding the material to the washing tank 210.

[0058] In the related art, a set amount of pure water is usually added to the water washing tank 210 in advance and stirring is started, and then the same batch of ternary positive electrode materials to be washed are fed by manual feeding or automatic metering; on the one hand, since the feeding and metering of the positive electrode materials need to last for a period of time (such as 10 minutes to 30 minutes) from the beginning to the end, and the material residence time set in the water washing tank 210 is fixed, this will cause the positive electrode materials entering the water washing tank 210 in the early stage of feeding to be inconsistent with the positive electrode materials entering the water washing tank 210 in the later stage of feeding. It can be understood that the actual washing time of the positive electrode materials entering the water washing tank 210 in the early stage is greater than that of the positive electrode materials entering the water washing tank 210 in the later stage, resulting in inconsistent washing time for the same batch of positive electrode materials; on the other hand, since the amount of pure water pre-added in the water washing tank 210 is fixed, this causes the positive electrode materials entering the water washing tank 210 in the early stage to be washed under the condition of a high solid-liquid ratio, thereby causing the positive electrode materials entering the water washing tank 210 in the early stage to be over-washed. Therefore, the washing consistency of the same batch of ternary positive electrode materials to be washed is poor, which affects the electrochemical performance and safety performance of the ternary positive electrode materials.

[0059] The feeding module 100 of the present application caches the same batch of ternary positive electrode materials to be washed in the material buffer mechanism 120 until the weight measurement is completed, and then feeds them into the washing tank 210 at the same time. The feeding time can be controlled within a shorter time (such as within three minutes). Such feeding significantly shortens the time difference between the same batch of materials in contact with pure water for washing, and enables the same batch of materials to start washing under relatively consistent solid-liquid ratio conditions, so that the washing solid-liquid ratio of the same batch of materials can be more accurately controlled, thereby significantly improving the washing consistency of the same batch of ternary positive electrode materials to be washed.

[0060] In some embodiments, the weight measurement mechanism 130 includes a weight sensor, which can be arranged in the material conveying mechanism 110 to obtain the weight of the put-in material by the reduction of weight. The weight sensor can also be arranged in the material buffer mechanism 120 to obtain the weight of the put-in material by the increase of weight.

[0061] In some embodiments, see Figure 1 The material conveying mechanism 110 includes a material receiving bin 111 and a material metering screw 112. The material receiving bin 111 is located upstream of the material metering screw 112. The material metering screw 112 quantitatively conveys the material through a spiral structure to avoid excessive material being conveyed at one time or to avoid the material agglomerating and being difficult to disperse, thereby affecting the washing effect. The material receiving bin 111 and the material metering screw 112 feed or stop feeding the material to the material buffer mechanism 120 according to the measurement result of the weight measuring mechanism 130. In some embodiments, please refer to Figure 1 The material buffer mechanism 120 and the weight measuring mechanism 130 can be integrated into one body to form a material metering bin (i.e., a metering mechanism). The material metering bin can be used to buffer materials and also can measure the weight of the buffered materials.

[0062] In some embodiments, a first connecting valve 1 is provided between the material receiving bin 111 and the material metering screw 112, a second connecting valve 2 is provided between the material metering screw 112 and the material metering bin, and a third connecting valve 3 is provided between the material metering bin and the water washing tank 210. When the weight measurement result of the material metering bin reaches the set weight, the first connecting valve 1 and the second connecting valve 2 are closed, thereby stopping the feeding into the material metering bin, and the third connecting valve 3 is opened, thereby realizing the control of the set weight of the material from the material metering bin to be quickly fed into the water washing tank 210.

[0063] The washing tank 210 is provided with a first discharge end 211 and a second discharge end 212. The first discharge end 211 is kept open to wash the slurry, and the second discharge end 212 is selectively opened or closed. The washing tank 210 of the present application is provided with at least one discharge end, and any one of the discharge ends or multiple discharge ends can be enabled at the same time according to actual needs.

[0064] In some embodiments, a flow sensor (not shown) is provided downstream of the first discharge end 211 in the water washing module 200. The flow sensor is used to detect the flow of the water washing slurry output by the first discharge end 211. The water washing tank 210 is also provided with a material level sensor (not shown) for detecting the material level of the water washing slurry in the water washing tank 210, and when the flow rate is lower than the flow rate setting value and the material level is higher than the material level preset value, the second discharge end 212 is opened. In the related art, since the specific gravity of the ternary positive electrode material is larger than that of water, it can settle at the bottom of the tank in a short time during the water washing process due to abnormal stirring and other reasons, affecting the normal discharge of the material that has completed the water washing operation, and long-term immersion during the recovery process will also cause the problem of over-water washing.

[0065] The present application sets a first discharge end 211 and a second discharge end 212 in the washing tank 210, one of which can be used as a spare discharge end. When abnormal stirring occurs during the washing process, blockage occurs in the washing tank 210, or material is abnormally retained, the material flow rate downstream of the discharge end will decrease. The flow sensor downstream of the discharge end can be used to detect when the measured material flow rate is lower than the set value. If the material level in the washing tank 210 is high at this time, the spare discharge end can be activated in time, so that the ternary positive electrode material that has completed or is close to completing washing in the washing tank 210 can be transported to the downstream in time, avoiding over-washing caused by retention in the washing tank 210, thereby significantly improving the working efficiency and fault tolerance of the washing system 1000.

[0066] In some embodiments, the first discharge end 211 is provided with a fourth connecting valve 4 and a fifth connecting valve 5 in sequence along its downstream direction, and the second discharge end 212 is provided with a sixth connecting valve 6 and a seventh connecting valve 7 in sequence along its downstream direction. Taking the opening of the first discharge end 211 as an example, when the flow rate measured by the flow sensor is lower than the flow setting value and the material level measured by the material level sensor is higher than the material level preset value, the sixth connecting valve 6 and the seventh connecting valve 7 of the second discharge end 212 are opened, so that when a blockage or abnormal condition occurs in the washing tank 210, the spare discharge end is activated to clear the material in time to avoid excessive washing of the material. The fourth connecting valve 4 and the fifth connecting valve 5 arranged in sequence can facilitate maintenance and prevent material from being shunted. The sixth connecting valve 6 and the seventh connecting valve 7 arranged in sequence can facilitate maintenance and prevent material from being shunted.

[0067] like Figure 1 As shown, the filter press module 300 includes a material filter press conveying pipeline 310 and a solid-liquid separation mechanism 320. The material filter press conveying pipeline 310 is connected to the discharge end of the water washing tank 210, and the solid-liquid separation mechanism 320 is arranged downstream of the material filter press conveying pipeline 310. The washed slurry reaches the solid-liquid separation mechanism 320 through the material filter press conveying pipeline 310, and the solid-liquid separation mechanism 320 is used to intercept the washed material and allow the washing liquid to pass through to form a filtrate.

[0068] The filter press module 300 also includes a first storage tank 330 and a second storage tank 340. Two downstream branches are extended along the downstream direction of the solid-liquid separation mechanism 320, namely, a first downstream branch 321 and a second downstream branch 322; the first downstream branch 321 is connected to the feed end of the first storage tank 330, and the discharge end of the first storage tank 330 is connected to the feed end of the washing tank 210; the second downstream branch 322 is connected to the feed end of the second storage tank 340, and the discharge end of the second storage tank 340 is connected to the material filter press conveying pipeline 310; the filtrate formed by the solid-liquid separation mechanism 320 flows into the first storage tank 330 through the first downstream branch 321, or flows into the second storage tank 340 through the second downstream branch 322.

[0069] Among them, when the solid content of the filtrate is greater than the preset value, the filtrate enters the first storage tank 330 through the first downstream branch 321, and when the solid content of the filtrate is less than or equal to the preset value, the filtrate enters the second storage tank 340 through the second downstream branch 322. The conventional solid-liquid separation process after the ternary positive electrode material is washed with water is a filter press separation. Since the filter cake has not been fully formed in the early stage of the filter press feeding, the filtering capacity of the filter press has not reached the best, resulting in some solid materials filtering out with the initial filtrate. Therefore, the solid content of the filtrate in the initial stage of the filter press is relatively high; in the middle and late stages of the filter press, the filter cake is basically formed and has sufficient filtering capacity, and the solid content of the obtained filtrate in the middle and late stages of the filter press is relatively low. Therefore, the above-mentioned solid content preset value of the filtrate is used to distinguish the initial filtrate from the middle and late filtrate. In actual operation, the initial filtrate and the middle and late filtrate can be divided according to the time period, such as the washing filtrate in the first five minutes is regarded as the initial filtrate.

[0070] The filter press module 300 may further include a third storage tank 350, the discharge end of which is connected to the material filter press delivery pipeline 310. The third storage tank 350 is used to cache pure water, and to deliver the cached pure water to the material filter press delivery pipeline 310 through its discharge end, so as to rinse the filter cake and the washed and dried material.

[0071] In the related art, the solid materials in the initial filtrate of the filter press are discharged as waste liquid, which will cause material loss and increase production costs. If they are directly mixed into the next running water for use, because they contain a high washing alkali, it will affect the washing effect of the subsequent running water. The present application sets a first storage tank 330, which can be used to recover the initial filtrate of the filter press with a high solid content, and use the initial filtrate to rinse the residual slurry in the washing tank 210, so that the solid materials in the initial filtrate of the filter press can be returned to the washing system 1000, which is beneficial to improve the recovery rate of the washed materials. Such a setting can efficiently utilize the solid materials in the initial filtrate of the filter press, avoiding direct loss of materials, and at the same time, it can prevent the residual slurry in the washing tank 210 from being mixed into the subsequent batches of materials to be washed, thereby improving the washing consistency of the washing system 1000.

[0072] The present application also sets up a second storage tank 340, which can be used to recover the middle and late stage filtrate of the filtration with relatively low solid content, and use the middle and late stage filtrate to flush the material filtration conveying pipeline 310, so that the water washing system 1000 is equipped with a filtrate flushing pipeline function, thereby reducing the amount of solid material remaining in the conveying pipeline, and preventing the residual solid material from mixing into the next batch of materials to be washed after being soaked for a long time. At the same time, flushing the pipeline in this way also prevents the residual solid material from settling and clogging the pipeline when it is left stationary, thereby maintaining the normal conveying function of the pipeline.

[0073] In some embodiments, see Figure 1 The washing tank 210 and the third storage tank 350 of the present application are both provided with a water inlet pipeline 16. The water inlet pipeline 16 can provide pure water for washing to the washing tank 210, or provide pure water for flushing to the third storage tank 350.

[0074] In the related art, when solid-liquid separation is performed, the filter cake formed will contain a certain amount of water, and the water remaining in the filter cake dissolves a high content of eluted alkali, including LiOH, Li 2 CO 3 In the subsequent drying process, the washed alkali dissolved in the residual moisture of the filter cake will return to the material. It is understandable that the higher the moisture content of the filter cake before drying, the higher the residual alkali level of the material after washing and drying, and the washing effect does not reach the ideal level. Moreover, it often takes a long time to dehydrate the filter cake to the required moisture content. The pursuit of a low moisture content of the filter cake before drying will seriously sacrifice the overall washing operation efficiency and seriously affect production capacity.

[0075] The present application sets up a third storage tank 350, which can be used to store pure water, and use pure water to flush the material filter press conveying pipeline 310, so that the water washing system 1000 is equipped with a pure water flushing pipeline function, and uses pure water to flush the filter cake formed in the solid-liquid separation process, thereby reducing the residual alkali value of the dried material after water washing and improving the water washing effect.

[0076] In some embodiments, an eighth connecting valve 8 is provided upstream of the discharge end of the first storage tank 330, and the eighth connecting valve 8 is provided on the first downstream branch 321. A ninth connecting valve 9 is provided upstream of the discharge end of the second storage tank 340, and the ninth connecting valve 9 is provided on the second downstream branch 322. When the solid content of the filtrate passing through the solid-liquid separation mechanism 320 is greater than a preset value, the eighth connecting valve 8 is opened and the ninth connecting valve 9 is closed, and when the above solid content is less than the preset value, the ninth connecting valve 9 is opened and the eighth connecting valve 8 is closed, so that the first storage tank 330 recovers the initial filtrate with a high solid content in the early stage of the filter press, and the second storage tank 340 recovers the mid- and late-stage filtrate with a low solid content in the filter press.

[0077] In some embodiments, a tenth connecting valve 10 is provided between the first storage tank 330 and the washing tank 210. During the operation of the washing system 1000, when most of the washing slurry in the washing tank 210 enters the material filter pressing and conveying pipeline 310, the tenth connecting valve 10 is opened, so that the residual washing slurry in the washing tank 210 is washed with the initial filter pressing filtrate in the first storage tank 330, so as to prevent the residual slurry in the washing tank 210 from being mixed into the next batch of materials to be washed. It can be understood that when the initial filter pressing filtrate is completely discharged, the tenth connecting valve 10 is closed.

[0078] In some embodiments, an eleventh connecting valve 11 and a twelfth connecting valve 12 are sequentially provided between the second storage tank 340 and the material filter pressing conveying pipeline 310. During the operation of the water washing system 1000, when the material filter pressing conveying pipeline 310 is in a state of not conveying materials, the eleventh connecting valve 11 and the twelfth connecting valve 12 are opened, so that the material filter pressing conveying pipeline 310 is flushed with the filtrate in the middle and late stages of the filter pressing in the second storage tank 340, thereby flushing the residual solid materials in the material filter pressing conveying pipeline 310. The eleventh connecting valve 11 and the twelfth connecting valve 12 can be used to control the switching of the pure water and filtrate flushing modes.

[0079] In some embodiments, a thirteenth connecting valve 13 and a fourteenth connecting valve 14 are sequentially provided between the third storage tank 350 and the material filter pressing conveying pipeline 310, and the fourteenth connecting valve 14 is connected to the fourth connecting valve 4 and the fifth connecting valve 5 through a three-way connection. During the operation of the water washing system 1000, when the dried material after water washing is produced, the thirteenth connecting valve 13 and the fourteenth connecting valve 14 are opened, so that the pure water in the third storage tank 350 is used to wash the material filter pressing conveying pipeline 310, the filter cake and the dried material, thereby reducing the residual alkali content in the dried material and improving the washing effect of the ternary positive electrode material. The thirteenth connecting valve 13 and the fourteenth connecting valve 14 can be used to control the switching of the pure water and filtrate washing modes.

[0080] In some embodiments, the material metering bin is connected to the communication valve disposed upstream thereof by a soft connection, which is conducive to improving the metering accuracy of the material metering bin.

[0081] In some embodiments, the material filter press conveying pipeline 310 is also provided with a demagnetization device 311, which is used to remove ferromagnetic particles in the ternary positive electrode material to keep the material clean and protect downstream equipment.

[0082] In some embodiments, the material filter pressing and conveying pipeline 310 is further provided with a feed pump 312. The material filter pressing and conveying pipeline 310 is further provided with a fifteenth connecting valve 15, which is used to control the conveying of materials or liquids.

[0083] The present application also includes a processor. The processor is used to control the corresponding operation of each connecting valve. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0084] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A water washing system for ternary positive electrode materials, characterized in that: It comprises a feeding module, a washing module located downstream of the feeding module, and a filter press module located downstream of the washing module, wherein the washing module comprises a washing tank; the feeding module is used to feed the material to be washed into the washing tank, the washing tank is used to wash the material to be washed to form a washing slurry and feed the washing slurry into the filter press module, the washing slurry comprises washed material and washing liquid, and the filter press module is used to separate the washed material from the washing liquid; The feeding module includes a material conveying mechanism, a material buffer mechanism located downstream of the material conveying mechanism, and a weight measuring mechanism. The material conveying mechanism is used to feed the material to be washed into the material buffer mechanism, and the weight measuring mechanism is used to measure the weight of the fed material to be washed. The material buffer mechanism feeds the material to be washed into the washing tank at one time based on the weight.

2. The water washing system for the ternary cathode material according to claim 1, characterized in that: The weight measurement mechanism includes a weight sensor, which is arranged in the material conveying mechanism or the material buffer mechanism and is used to measure the weight change of the material conveying mechanism or the material buffer mechanism.

3. The water washing system for the ternary cathode material according to claim 1, characterized in that: The water washing tank is provided with a first discharge end and a second discharge end, the first discharge end is kept open to output the water-washed slurry, and the second discharge end is selectively opened or closed.

4. The water washing system for the ternary cathode material according to claim 3, characterized in that: A flow sensor is provided downstream of the first discharge end, and the flow sensor is used to measure the flow of the water-washed slurry output by the first discharge end. A level sensor is provided in the water washing tank, and the level sensor is used to measure the level of the material to be washed in the water washing tank. The second discharge end is selectively opened or closed based on the flow and the level.

5. The water washing system for the ternary cathode material according to claim 3, characterized in that: The filter press module includes a material filter press conveying pipeline and a solid-liquid separation mechanism, the material filter press conveying pipeline connects the first discharge end and the second discharge end, the solid-liquid separation mechanism is arranged downstream of the material filter press conveying pipeline, and the solid-liquid separation mechanism is used to intercept the washed material and allow the washing liquid to pass through to form a filtrate.

6. The water washing system for the ternary cathode material according to claim 5, characterized in that: The filter press module also includes a first storage tank and a second storage tank connected downstream of the solid-liquid separation mechanism, the discharge end of the first storage tank is connected to the feed end of the water washing tank, and the discharge end of the second storage tank is connected to the material filter press conveying pipeline.

7. The water washing system for the ternary cathode material according to claim 5, characterized in that: The filter press module also includes a third storage tank, which is used to buffer pure water. The discharge end of the third storage tank is connected to the material filter press conveying pipeline.

8. The water washing system for the ternary cathode material according to claim 7, characterized in that: It also includes a water inlet pipeline connected to the water washing tank or the third storage tank, and the water inlet pipeline is used to provide pure water to the water washing tank or the third storage tank.

9. The water washing system for the ternary cathode material according to claim 5, characterized in that: The material filter pressing and conveying pipeline is also provided with a demagnetizing device.

10. The water washing system for the ternary cathode material according to claim 1, characterized in that: The material conveying mechanism comprises a material receiving bin and a material metering screw, wherein the material receiving bin is arranged upstream of the material metering screw; the material buffer mechanism and the weight measuring mechanism are integrated into one body to form a material metering bin.

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