Electrolyte additive dehydration equipment and battery production system

Abstract

The embodiment of the invention provides electrolyte additive dehydration equipment and a battery production system, and relates to the technical field of battery production and processing equipment. The electrolyte additive dehydration equipment comprises a vapor-liquid contact device and a first recovery device, the vapor-liquid contact device is sequentially provided with a first discharge port, a first feed port, a second feed port, a first return port and a second discharge port, and the first recovery device is communicated with the first return port and the second discharge port. Dehydration of the electrolyte additive is achieved through the vapor-liquid contact device, meanwhile, after the vapor-state dehydration auxiliary material is subjected to water reduction through the first recycling device, the vapor-state dehydration auxiliary material returns to the vapor-liquid contact device again through the first material return opening, and therefore the use amount of the dehydration auxiliary material is reduced, and the dehydration cost of the electrolyte additive is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to an electrolyte additive dehydration device and a battery production system. BACKGROUND

[0002] In the process of preparing electrolyte of a battery, lithium bis(fluorosulfonyl)imide (LiFSI) and other additives need to be dehydrated to make the purity and moisture of the electrolyte additives reach the standard of battery grade.

[0003] A large amount of dehydration auxiliary materials is needed when lithium bis(fluorosulfonyl)imide (LiFSI) and other battery electrolyte additives are dehydrated, resulting in high dehydration cost. Therefore, how to reduce the dehydration cost of battery electrolyte additives is a research direction in the field of batteries. SUMMARY

[0004] The present application provides an electrolyte additive dehydration device which can reduce the dehydration cost of battery electrolyte additives.

[0005] In a first aspect, the present application provides an electrolyte additive dehydration device, comprising a vapor-liquid contact device and a first recovery device, the vapor-liquid contact device is used for dehydration of electrolyte additives, the vapor-liquid contact device has a first end and a second end opposite to each other, from the first end to the second end, the vapor-liquid contact device is provided with a first discharge port, a first feeding port, a second feeding port, a first return port and a second discharge port, the first discharge port is used for discharging the dehydrated electrolyte additives, the first feeding port is used for adding dehydration auxiliary materials, and the second feeding port is used for adding electrolyte additives before dehydration; the first recovery device is connected with the first return port and the second discharge port respectively, the first recovery device is used for dehydrating the dehydration auxiliary materials flowing out of the second discharge port, and the dehydration auxiliary materials after dehydration are sent into the vapor-liquid contact device through the first return port. The present application utilizes the different boiling points and volatilities of electrolyte additives, dehydration auxiliary materials and water in the vapor-liquid contact device, so that the low-boiling-point water and dehydration auxiliary materials are transferred to the gas phase, and the high-boiling-point electrolyte additives are transferred to the liquid phase, the dehydration auxiliary materials drive the water to separate from the electrolyte additives in the form of steam, thereby realizing the dehydration of electrolyte additives. At the same time, the first recovery device is used to dehydrate the vapor-state dehydration auxiliary materials, and then the dehydration auxiliary materials are returned to the vapor-liquid contact device through the first return port, thereby reducing the use amount of dehydration auxiliary materials and the dehydration cost of electrolyte additives.

[0006] In some embodiments of the present application, the vapor-liquid contact device comprises a rectifying tower having the first discharge port, the first feed port, the second feed port, the first return port and the second discharge port, and a heating assembly connected to the rectifying tower and configured to heat the substance in the rectifying tower. The present application heats the mixed liquid in the rectifying tower by the heating assembly, and uses the rectifying tower to transfer the low-boiling water and the dehydration auxiliary material to the gas phase, and the high-boiling electrolyte additive to the liquid phase, thereby realizing the dehydration of the electrolyte additive.

[0007] In some embodiments of the present application, the heating assembly comprises a reboiler and a first circulating pump, the rectifying tower is provided with a first circulating port and a second circulating port, the reboiler is connected between the first circulating port and the first circulating pump pipeline, and the first circulating pipeline is connected to the second circulating port pipeline. The present application uses the first circulating pump to drive the mixed liquid to circulate in the reboiler and the bottom of the rectifying tower, uses the reboiler to heat the dehydration auxiliary material and the water to be in a vapor state, and the reboiler can condense the steam back to liquid, so that the water is effectively separated from the mixture, thereby improving the dehydration efficiency.

[0008] In some embodiments of the present application, the second circulating port is provided at the first end, and the first circulating port is located between the second circulating port and the first feed port in the direction from the first end to the second end. The present application provides the second circulating port at the first end to facilitate the mixed liquid of the dehydration auxiliary material and the water to enter the reboiler, and provides the first circulating port between the second circulating port and the first feed port, so that the treated mixed liquid after being treated returns to the rectifying tower from the reboiler and participates in the next dehydration process.

[0009] In some embodiments of the present application, the first recovery device comprises a first condensing assembly, a precipitation assembly and a second circulating pump, the first condensing assembly, the precipitation assembly and the second circulating pump are sequentially connected by pipelines, the first condensing assembly is connected to the second discharge port, and the second circulating pump is connected to the first return port by a pipeline. The present application condenses the vaporized water and the dehydration auxiliary material by the first condensing assembly, uses the second circulating pump to drive the mixed liquid of the condensed dehydration auxiliary material and water to enter the precipitation assembly for dehydration treatment, and then uses the second circulating pump to drive the dehydrated mixed liquid to return to the rectifying tower again to participate in the dehydration operation, thereby realizing the recycling of the dehydration auxiliary material.

[0010] In some embodiments of the present application, the precipitation assembly comprises a feed pipe and a precipitation mechanism, the feed pipe being in communication between the precipitation mechanism and the first condensation assembly, and the precipitation mechanism being configured to reduce the moisture content of the dehydration auxiliary material. The present application utilizes the precipitation mechanism to perform precipitation treatment on the dehydration auxiliary material by connecting the precipitation mechanism and the first condensation assembly through the feed pipe.

[0011] In some embodiments of the present application, the precipitation mechanism comprises a top wall, a bottom wall, and a first separation groove, a feed groove, and a second separation groove arranged in sequence between the top wall and the bottom wall along a first direction intersecting the arrangement direction of the top wall and the bottom wall, the first separation groove has a first opening facing the top wall, the feed groove is provided with a second opening facing the top wall and communicating with the feed pipe, the second separation groove has a third opening facing the top wall, and along the arrangement direction of the top wall and the bottom wall, the distance between the first opening and the top wall is greater than the distance between the third opening and the top wall, and the first separation groove is in communication with the second circulating pump. The present application enables the dehydration auxiliary material with a larger density to enter the first separation groove and the water to overflow into the second separation groove by the different opening heights of the first separation groove and the second separation groove, thereby realizing precipitation treatment of the dehydration auxiliary material, and the structure is simple and the precipitation effect is good.

[0012] In some embodiments of the present application, the first recycling device further comprises a sewage recycling assembly in communication with the second separation groove. The present application recycles the sewage containing a certain amount of dehydration auxiliary material in the second separation groove by configuring the sewage recycling assembly, thereby saving energy and protecting the environment.

[0013] In some embodiments of the present application, the sewage recycling assembly comprises a sewage recycling pipeline and a first temporary storage container in communication between the second separation groove and the sewage recycling pipeline. The present application realizes the collection and buffering of the sewage before treatment and discharge by configuring the first temporary storage container for sewage recycling.

[0014] In some embodiments of the present application, a first filler is installed in the feed pipe. The present application can preliminarily separate the mixture of water and dehydration auxiliary material by the first filler, thereby reducing the possibility of water emulsification.

[0015] In some embodiments of the present application, the first filler is located at one end of the feed pipe in communication with the precipitation mechanism, and the inner wall of the feed pipe is provided with a supporting member supporting the first filler. The present application supports and fixes the first filler by the supporting member, thereby improving the stability of the first filler in the feed pipe.

[0016] In some embodiments of the present application, the first recycling device further comprises a second temporary storage container, which is in communication between the precipitation assembly and the second circulating pump. The present application stores the dewatering auxiliary material after precipitation treatment in the second temporary storage container, so as to replenish the vapor-liquid contact device at any time.

[0017] In some embodiments of the present application, the electrolyte additive dewatering device further comprises a second recycling device, the vapor-liquid contact device is provided with a second recycling port between the first recycling port and the second discharging port, the second recycling device is in communication with the second recycling port, the second recycling device recovers the dewatering auxiliary material of the second recycling port, and the dewatering auxiliary material is condensed and then transported to the vapor-liquid contact device through the second recycling port again. The present application collects and reuses the dewatering auxiliary material with lower water content by configuring the second recycling device, further reduces the use amount of the dewatering auxiliary material, and thus reduces the dewatering cost of the electrolyte additive.

[0018] In some embodiments of the present application, the second recycling device comprises a second condensing assembly and a third temporary storage container, and the second condensing assembly is in communication between the second recycling port and the third temporary storage container. The present application condenses the mixed solution of the vaporized dewatering auxiliary material and water by the second condensing assembly, and then collects the mixed solution by the third temporary storage container, so as to replenish the vapor-liquid contact device at any time subsequently.

[0019] In a second aspect, the embodiments of the present application provide a battery production system, which comprises the electrolyte additive dewatering device according to any one of the above technical solutions. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by the drawings without creative labor for those skilled in the art.

[0021] Figure 1 The structural schematic diagram of the electrolyte additive dewatering device provided by some embodiments of the present application is shown in the figure;

[0022] Figure 2 The structural schematic diagram of the precipitation assembly of the electrolyte additive dewatering device provided by some embodiments of the present application is shown in the figure;

[0023] Figure 3 The partial structural schematic diagram of the feeding pipe of the electrolyte additive dewatering device provided by some embodiments of the present application is shown in the figure;

[0024] Figure 4The mounting structure of the support of the feed pipe of the electrolyte additive dewatering equipment provided in some embodiments of the present application is shown in the schematic view.

[0025] The reference signs of the specific embodiments are as follows:

[0026] 100, electrolyte additive dewatering equipment;

[0027] 10, vapor-liquid contact device; 10a, first end; 10b, second end; 101, first discharge port; 102, first feed port; 103, second feed port; 104, first return port; 105, second discharge port; 106, first circulation port; 107, second circulation port; 108, second return port; 11, rectifying column; 111, column body; 112, second packing; 12, heating assembly; 121, reboiler; 122, first circulation pump;

[0028] 20, first recovery device; 21, first recovery pipeline; 22, first condensing assembly; 23, precipitation assembly; 231, feed pipe; 2311, first packing; 2312, support; 232, precipitation mechanism; 2321, top wall; 2322, bottom wall; 2323, first separation groove; 23231, first opening; 2324, feed groove; 23241, second opening; 2325, second separation groove; 23251, third opening; 2326, side wall; 2327, first partition; 2328, second partition; 24, second recovery pipeline; 25, second circulation pump; 26, sewage recovery assembly; 261, sewage recovery pipeline; 262, first temporary storage container; 27, second temporary storage container;

[0029] 30, second recovery device; 31, second condensing assembly; 32, third temporary storage container;

[0030] X, first direction; Y, second direction. Specific Embodiments

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0033] Reference throughout this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, nor are they necessarily all mutually exclusive embodiments.

[0034] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0035] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0036] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0037] "Multiple" appearing in the application means two or more (including two).

[0038] In the following, the embodiments of the application will be described in detail.

[0039] At present, the application of power battery is more and more extensive. The power battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles and electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0040] In the production process of the battery, the electrolyte additive such as lithium bisfluorosulfonylimide (Li FSI) needs to be dehydrated, because the water content of lithium bisfluorosulfonylimide may have a negative impact on the performance of the battery, so the water in Li FSI is removed by dehydration to ensure the quality and performance of the electrolyte.

[0041] In the related art, the falling film or thin film evaporator is usually used for dehydration, which not only has low dehydration efficiency, but also causes material decomposition, and a large amount of dehydration solvent is needed for dehydration in the dehydration process, and then the dehydration solvent is dehydrated and refined again by using a rectifying column, which has high energy consumption, resulting in high cost of electrolyte additive dehydration.

[0042] Therefore, improving the dehydration efficiency of electrolyte additive and reducing the dehydration cost is an important topic in battery production and processing.

[0043] Therefore, the present application provides a technical scheme, which dehydrates the electrolyte additive by using a vapor-liquid contact device, and recycles and reuses the dehydration auxiliary material, thereby improving the dehydration efficiency of the electrolyte additive and reducing the dehydration cost.

[0044] The following will be described in combination with the accompanying Figures 1-4 The structure of the electrolyte additive dehydration equipment of the embodiment is introduced.

[0045] The following will be described in combination with the accompanying Figure 1 The embodiment provides an electrolyte additive dehydration equipment 100, which comprises a vapor-liquid contact device 10 and a first recovery device 20. The vapor-liquid contact device 10 has a first end 10a and a second end 10b opposite to each other. From the first end 10a to the second end 10b, the vapor-liquid contact device 10 is provided with a first discharge port 101, a first feeding port 102, a second feeding port 103, a first return port 104 and a second discharge port 105. The first discharge port 101 is used for discharging the dehydrated electrolyte additive. The first feeding port 102 is used for adding dehydration auxiliary material. The second feeding port 103 is used for adding electrolyte additive before dehydration. The first recovery device 20 is connected with the first return port 104 and the second discharge port 105 respectively. The first recovery device 20 is used for dewetting the dehydration auxiliary material flowing out of the second discharge port 105, and conveying the dewetted dehydration auxiliary material into the vapor-liquid contact device 10 through the first return port 104.

[0046] It should be noted that the "precipitation" described in this embodiment refers to partial dehydration, that is, reducing the water content in the mixed liquid or mixed gas of the dehydration auxiliary material and water.

[0047] The main principle of the vapor-liquid contact device 10 is to use the different boiling points and volatility of the electrolyte additive, dehydration auxiliary material and water, so that the low-boiling water and dehydration auxiliary material are transferred to the gas phase, and the high-boiling electrolyte additive is transferred to the liquid phase. The dehydration auxiliary material drives the water to separate from the electrolyte additive in the form of steam, thereby realizing the dehydration of the electrolyte additive. The vapor-liquid contact device 10 has the characteristics of high efficiency, reliability, energy saving and environmental protection.

[0048] The vapor-liquid contact device 10 has many types, such as tower type (i.e. rectifying column 11 described below), spray type, cyclone type, membrane type and oscillation type, etc. This embodiment does not enumerate and describe them one by one.

[0049] The first discharge port 101, the first inlet port 102, the second inlet port 103, the first return port 104 and the second discharge port 105 can be arranged in order from the first end 10a to the second end 10b.

[0050] The first discharge port 101 can be located at the first end 10a of the vapor-liquid contact device 10, and the first end 10a is the lower end of the vapor-liquid contact device 10 when the device is actually applied, so that the dehydrated electrolyte additive can be directly discharged at the bottom of the vapor-liquid contact device 10.

[0051] The first inlet port 102 is used to add dehydration auxiliary material, and the first inlet port 102 needs to be located below the second inlet port 103. The dehydration auxiliary material exists in a liquid state when it is fed, and is mixed with water to form an oil-liquid state. The dehydration auxiliary material can be methyl ethyl carbonate, which has a boiling point slightly higher than water and is insoluble in water. When the dehydration auxiliary material evaporates or condenses, it can carry away a certain amount of water.

[0052] Of course, in addition to the above-mentioned methyl ethyl carbonate, the dehydration auxiliary material can also be diethyl carbonate, which has similar physical and chemical properties.

[0053] The second inlet port 103 is used to add the electrolyte additive before dehydration. The electrolyte additive can be lithium bisfluorosulfonylimide, which has a boiling point higher than water and dehydration auxiliary material. The second inlet port 103 should be located above the first inlet port 102, so that the dehydration auxiliary material below can carry away the water in the electrolyte additive above when it vaporizes and goes up.

[0054] The second outlet 105 can be located at the second end 10b, which is the upper end of the vapor-liquid contact device 10 in actual application, and the dehydrated auxiliary material and water vaporized after dehydration are discharged from the top of the vapor-liquid contact device 10, then enter the first recovery device 20, and then return to the vapor-liquid contact device 10 through the first return port 104 after the vaporized dehydrated auxiliary material is precipitated by the first recovery device 20, thereby reducing the use amount of the dehydrated auxiliary material and the dehydration cost of the electrolyte additive.

[0055] In some examples, optionally, the vapor-liquid contact device 10 comprises a rectifying tower 11 having a first outlet 101, a first inlet 102, a second inlet 103, a first return port 104 and a second outlet 105, and a heating assembly 12 connected to the rectifying tower 11 and used for heating the substances in the rectifying tower 11.

[0056] The heating assembly 12 heats the mixed liquid in the rectifying tower 11, and the low-boiling-point water and dehydrated auxiliary material are transferred to the gas phase and the high-boiling-point electrolyte additive is transferred to the liquid phase by the rectifying tower 11, thereby realizing the dehydration of the electrolyte additive.

[0057] In some examples, optionally, the rectifying tower 11 can be a plate tower comprising a tower body 111 and a plurality of tower plates (not shown in the figure) arranged in the tower body 111, or a packed tower having a plurality of packings arranged therein.

[0058] In some examples, optionally, the rectifying tower 11 of the embodiment is a packed tower comprising a tower body 111 and a plurality of second packings 112 arranged in the tower body 111. The second packings 112 can have a cylindrical shape as a whole, and the cylindrical second packings 112 have a plurality of mesh-like structures with a plurality of channels or gaps, thereby providing more contact points on the surface of the second packings 112 to promote the heat and mass transfer between the mixed liquids, so as to improve the mass transfer efficiency and separation efficiency in the rectifying tower 11. Moreover, the mesh-like structure of the second packings 112 can hinder the free flow of the liquid, thereby increasing the contact time of the liquid with the surface of the packings and helping to improve the mass transfer efficiency.

[0059] In the dehydration process, the water and the dehydrated auxiliary material entering through the first inlet 102 are heated to vaporization by the heating assembly 12, and then the vaporized dehydrated auxiliary material carrying the water passes through the packing gaps and goes up, and contacts with the electrolyte additive added through the second inlet 103 to perform mass and heat transfer, thereby taking away the water in the electrolyte additive, and then flows out through the second outlet 105. At this time, the vaporized dehydrated auxiliary material flowing out has a high water content, for example, the water content is greater than or equal to 1.5%, which can be referred to as high-water-content dehydrated auxiliary material.

[0060] The high water content dewatering aid material then enters the first recovery device 20, which condenses and precipitates the water carried by the dewatering aid material, reducing the water content of the dewatering aid material to less than 200 ppm, and then supplements the dewatering aid material into the rectifying tower 11 through the first recovery port 104. The refluxed dewatering aid material constitutes the condensing agent of the mixed vapor (including dewatering aid material, water, and electrolyte additives) in the rectifying tower 11, and also supplements the volatile components of the mixed liquid (including dewatering aid material, water, and electrolyte additives) on the second packing 112, so that the composition of the liquid phase in the packing remains unchanged to maintain stable operation.

[0061] In some examples, the heating assembly 12 optionally includes a reboiler 121 and a first circulating pump 122, and the rectifying tower 11 is provided with a first circulating port 106 and a second circulating port 107. The reboiler 121 is in communication with the first circulating port 106 and the first circulating pump 122 through pipelines, and the first circulating pump 122 is in communication with the second circulating port 107.

[0062] The reboiler 121 is the total heat source of the entire rectifying tower 11, which heats the liquid of the dewatering aid material carrying water to form an upward steam flow of a certain flow rate, and can form a steam reflux at the first end 10a (bottom) of the rectifying tower 11. The principle of the reboiler 121 is to use electricity or other heat sources to provide heat to heat the liquid above its boiling point. When the liquid reaches the boiling point, boiling begins and gas bubbles are generated. The reboiler 121 keeps the liquid in a boiling state by continuously supplying heat, keeping the liquid at a temperature above the boiling point.

[0063] The first circulating pump 122 can be a centrifugal pump, a vacuum pump, a circulating pump, a diaphragm pump, etc., which will not be listed one by one in this embodiment.

[0064] The lower end of the reboiler 121 is connected and communicated with the first circulating port 106 through a pipeline, and the upper end is connected and communicated with the first circulating pump 122 through a pipeline. The first circulating pump 122 is connected with the second circulating port 107 through a pipeline.

[0065] When the heating assembly 12 is operating, the first circulating pump 122 drives the mixed liquid to circulate in the reboiler 121 and the bottom of the rectifying tower 11. The reboiler 121 heats the dewatering aid material and water into a gaseous state, and the reboiler 121 can condense the steam back into liquid, so that the water is effectively separated from the mixture, thereby improving the dewatering efficiency.

[0066] In some examples, the first circulating port 106 is provided at the first end 10a, and the second circulating port 107 is located between the first circulating port 106 and the first feed port 102 in the direction from the first end 10a to the second end 10b.

[0067] The first circulation port 106 can be arranged on the bottom wall 2322 of the rectifying tower 11, so as to facilitate the mixture of the dehydration auxiliary material and water to enter the reboiler 121.

[0068] The second circulation port 107 can be arranged on the lower side wall 2326 of the rectifying tower 11, and the second circulation port 107 is arranged between the first circulation port 106 and the first feeding port 102, so that the treated mixture after being treated returns to the rectifying tower 11 from the reboiler 121 and participates in the next round of dehydration process.

[0069] In some examples, the first recycling device 20 can optionally include a first condensing assembly 22, a precipitation assembly 23 and a second circulating pump 25; the first condensing assembly 22, the precipitation assembly 23 and the second circulating pump 25 are sequentially communicated through pipelines, the first condensing assembly 22 is connected and communicated with the second discharging port 105 through a pipeline, and the second circulating pump 25 is connected and communicated with the first recycling port 104 through a pipeline.

[0070] In addition, the first recycling device 20 can further include a first recycling pipeline 21 and a second recycling pipeline 24, the first recycling pipeline 21, the first condensing assembly 22, the precipitation assembly 23 and the second recycling pipeline 24 are sequentially communicated, one end of the first recycling pipeline 21 is connected and communicated with the second discharging port 105, and the other end is connected and communicated with the first condensing assembly 22.

[0071] The first condensing assembly 22 can be a condenser for converting gas phase into liquid phase, and the condenser is internally provided with a condensing pipeline surrounded by a cooling medium (such as cold water or cooling liquid), when the steam contacts the surface of the condenser, the temperature thereof is rapidly reduced, so that the steam is condensed into liquid.

[0072] Similarly, the “precipitation” in the precipitation assembly 23 of the present embodiment should be understood as reducing the water content of the dehydration auxiliary material carrying water in liquid or gaseous state, which can be understood as partial dehydration, and the structure of the precipitation assembly 23 is given below.

[0073] When the dehydration auxiliary material is recycled, the vaporized water and auxiliary dehydration material are condensed through the first recycling pipeline 21 and the first condensing assembly 22, the second circulating pump 25 is used to drive the mixture of the condensed dehydration auxiliary material and water into the precipitation assembly 23 for dehydration treatment, and then the second circulating pump 25 is used to drive the mixture after dehydration to return to the rectifying tower 11 through the second recycling pipeline 24 to participate in the dehydration operation, so as to realize the recycling of the dehydration auxiliary material.

[0074] In some examples, the precipitation assembly 23 optionally comprises a feed pipe 231 and a precipitation mechanism 232, the feed pipe 231 being communicated between the precipitation mechanism 232 and the first condensation assembly 22, and the precipitation mechanism 232 being configured for reducing the moisture content of the dewatering auxiliary material.

[0075] The precipitation mechanism 232 is communicated with the first condensation assembly 22 through the feed pipe 231, and the dewatering auxiliary material is subjected to precipitation treatment by the precipitation mechanism 232.

[0076] In combination with the accompanying drawings, Figure 2 In some examples, the precipitation mechanism 232 optionally comprises a top wall 2321, a bottom wall 2322, and a first separation groove 2323, a feed groove 2324, and a second separation groove 2325 arranged in sequence along a first direction X between the top wall 2321 and the bottom wall 2322, the first direction X being perpendicular to the arrangement direction of the top wall 2321 and the bottom wall 2322, the first separation groove 2323 having a first opening 23231 facing the top wall 2321, the feed groove 2324 being provided with a second opening 23241 facing the top wall 2321 and communicated with the feed pipe 231, the second separation groove 2325 having a third opening 23251 facing the top wall 2321, along the arrangement direction of the top wall 2321 and the bottom wall 2322, the distance between the first opening 23231 and the top wall 2321 being greater than the distance between the third opening 23251 and the top wall 2321, and the first separation groove 2323 being communicated with the second recovery pipeline 24.

[0077] The first direction X and the second direction Y can be perpendicular to each other, in the actual operation of the device, the first direction X can be understood as the horizontal direction, and the arrangement direction of the top wall 2321 and the bottom wall 2322 (the second direction Y) can be understood as the vertical direction.

[0078] The precipitation mechanism 232 is internally provided with a first partition plate 2327 and a second partition plate 2328, and the precipitation mechanism 232 comprises a side wall 2326 communicated between the top wall 2321 and the bottom wall 2322, the first partition plate 2327 being communicated between the bottom wall 2322 and the side wall 2326, and the first partition plate 2327, the bottom wall 2322, and the side wall 2326 surrounding the first separation groove 2323. The second partition plate 2328 is communicated between the bottom wall 2322 and the side wall 2326, and the second partition plate 2328, the bottom wall 2322, and the side wall 2326 surround the second separation groove 2325. The first partition plate 2327, the second partition plate 2328, the bottom wall 2322, and the side wall 2326 surround the feed groove 2324, or only the first partition plate 2327, the second partition plate 2328, and the bottom wall 2322 surround the feed groove 2324.

[0079] The distance between the first opening 23231 and the top wall 2321 is greater than the distance between the third opening 23251 and the top wall 2321. This can be understood as the height of the first opening 23231 of the first separation groove 2323 on the bottom wall 2322 being lower than the height of the third opening 23251 on the bottom wall 2322.

[0080] The condensed mixture is discharged through the outlet at the lower end of the feed pipe 231 into the second opening 23241 of the feed tank 2324. As the liquid level of the mixture of dehydration auxiliary material and water in the feed tank 2324 rises to overflow, the mixture first enters the lower first separation tank 2323 of the first opening 23231. Because the density of the dehydration auxiliary material is greater than that of water, the dehydration auxiliary material will be located below the first separation tank 2323, and the water will be located above the first separation tank 2323. As the liquid level in the first separation tank 2323 gradually rises, the first separation tank... Water overflows from the separation tank 2323, and since the liquid level in the feed tank 2324 has already overflowed, the water will rise and enter the second separation tank 2325. At this time, the water in the second separation tank 2325 will carry some dehydration auxiliary materials, while the first separation tank 2323 is mostly dehydration auxiliary materials and a small part is water. At this time, the water content in the dehydration auxiliary material mixture is reduced to less than 200ppm, so it can be returned to the distillation column 11 through the second recovery pipeline 24 and the first return port 104 to participate in the dehydration of electrolyte additives.

[0081] As can be seen from the above description, the different opening heights of the first separation tank 2323 and the second separation tank 2325 allow the denser dehydration auxiliary material to enter the first separation tank 2323, while the water overflows into the second separation tank 2325, thereby achieving dewatering treatment of the dehydration auxiliary material. The structure is simple and the dewatering effect is good.

[0082] Combined again with the appendix Figure 1 As shown, in some examples, the first recycling device 20 may optionally include a wastewater recycling component 26, which is connected to the second separation tank 2325.

[0083] Combined again with the appendix Figure 1 As shown, this embodiment uses a wastewater recycling component 26 to recycle wastewater containing certain dewatering auxiliary materials in the second separation tank 2325. The recycled wastewater can be filtered, thereby reusing the dewatering auxiliary materials and water, which is energy-saving and environmentally friendly.

[0084] In some examples, the wastewater recovery assembly 26 may optionally include a wastewater recovery line 261 and a first temporary storage container 262 connected between a second separation tank 2325 and the wastewater recovery line.

[0085] The first temporary storage container 262 is in communication with the inner cavity of the second separation tank 2325 through a pipeline, and the sewage recovery pipeline is connected to the bottom of the first temporary storage container 262.

[0086] After the precipitation mechanism 232 performs precipitation treatment for a certain period of time, the second separation tank 2325 contains sewage containing a small amount of dehydration auxiliary material, and the sewage recovery is performed through the first temporary storage container 262 to realize the collection and buffering before the sewage treatment and discharge, and then the sewage recovery pipeline is connected to the subsequent sewage treatment structure (not shown in the figure).

[0087] In some examples, the first temporary storage container 262 includes a first buffer tank.

[0088] The buffer tank can include a tank body, an inlet pipe and an outlet pipe arranged on the tank body, and a feed distribution structure and an internal packing (not shown in the figure) located in the tank body. The sewage enters the tank body through the inlet pipe, is uniformly distributed to the bottom of the buffer tank through the feed distribution structure, and the packing increases the surface area, which helps to achieve better phase contact and mass transfer efficiency in the buffer tank.

[0089] The first buffer tank can balance the pressure of the sewage, adjust the flow, and when the flow fluctuation or feed change occurs in the rectifying column 11, the first buffer tank can smoothly adjust the feed flow to maintain the stability of the column operation.

[0090] In combination with the drawings Figure 3 In some examples, the first packing 2311 is optionally installed in the feed pipe 231.

[0091] The first packing 2311 is made of metal or plastic, has a cylindrical shape, and is a mesh shape with multiple small gaps and channels.

[0092] The first packing 2311 can preliminarily separate the mixture of water and dehydration auxiliary material, and reduce the possibility of water emulsification.

[0093] In combination with the drawings Figure 4 In some examples, the first packing 2311 is located at one end of the feed pipe 231 in communication with the precipitation mechanism 232, and the inner wall of the feed pipe 231 is provided with a support member 2312 supporting the first packing 2311.

[0094] The material of the support member 2312 can be a metal material, the number of the support member 2312 can be one or more, the support member 2312 can be a rod or a plate, and the two ends of the support member 2312 are respectively connected to the inner walls of the two sides of the feed pipe 231 in a one-to-one correspondence, and the connection mode can be welding, clamping or the like.

[0095] The lower end of the first filler 2311 is located on the upper side of the supporting member 2312, and the first filler 2311 is fixed by the supporting member 2312, thereby improving the stability of the first filler 2311 in the feed pipe 231.

[0096] Again, referring to FIG. 1, in some examples, the first recovery device 20 optionally further includes a second temporary storage container 27, which is in fluid communication between the precipitation assembly 23 and the second circulating pump 25. Figure 1

[0097] When the first recovery device 20 includes the second recovery pipeline 24, the second recovery pipeline 24 includes a first sub-pipeline and a second sub-pipeline. The first sub-pipeline is in fluid communication between the precipitation assembly 23 and the second temporary storage container 27. The second sub-pipeline is in fluid communication between the second temporary storage container 27 and the first return port 104.

[0098] The second temporary storage container 27 is configured to store the dewatering auxiliary material after the precipitation treatment, so as to supplement the dewatering auxiliary material into the vapor-liquid contact device 10 at any time.

[0099] In some examples, the second temporary storage container 27 optionally includes a second buffer tank.

[0100] The structure of the second buffer tank is the same as or similar to the first buffer tank, and thus the description of the second buffer tank is omitted.

[0101] The second buffer tank functions to balance the pressure of the mixed solution, adjust the flow rate, and stably adjust the flow of the feed when there is a flow fluctuation or a feed change in the rectifying column 11, thereby maintaining the stability of the operation in the column.

[0102] In some examples, the vapor-liquid contact device 10 optionally further includes a second recovery device 30. The second recovery device 30 is in fluid communication with the second return port 108, which is located between the first return port 104 and the second discharge port 105. The second recovery device 30 recovers the dewatering auxiliary material from the second return port 108, condenses the dewatering auxiliary material, and then sends the dewatering auxiliary material to the vapor-liquid contact device 10 through the second return port 108.

[0103] The second return port 108 is located between the first return port 104 and the second discharge port 105. Since the second return port 108 is located in the middle of the rectifying column 11, the dewatering auxiliary material flowing out of the second return port 108 has a lower water content than the dewatering auxiliary material flowing out of the second discharge port 105. Generally, the water content of the dewatering auxiliary material flowing out of the second return port 108 is less than or equal to 200 ppm.

[0104] ​Therefore, the condensed and recovered water can be re-supplied to the rectifying tower 11 to improve the stability of the content of the vapor phase and the liquid phase in the rectifying tower 11, and thus improve the dehydration effect of the electrolyte additive.

[0105] By configuring the second recovery device 30 to collect and reuse the dehydration auxiliary material with low water content, the use amount of the dehydration auxiliary material is further reduced, thereby reducing the dehydration cost of the electrolyte additive.

[0106] In some examples, optionally, the second recovery device 30 includes a second condensing assembly 31 and a third temporary storage container 32, and the second condensing assembly 31 is connected between the second recovery port 108 and the third temporary storage container 32.

[0107] The second condensing assembly 31 has the same or similar structure as the first condensing assembly 22, and thus the structure and principle of the second condensing assembly 31 will not be described further.

[0108] When the second recovery device 30 performs the recovery operation, the vaporized mixture of the dehydration auxiliary material and water is first condensed by the second condensing assembly 31, and then the third temporary storage container 32 is used to collect the mixture, so as to supplement the mixture to the vapor-liquid contacting device 10 at any time.

[0109] In some examples, optionally, the third temporary storage container 32 is a third buffer tank.

[0110] The structure of the third buffer tank is the same as or similar to the first buffer tank, and thus the structure of the third buffer tank will not be described further.

[0111] Similarly, the third buffer tank also has the functions of balancing the pressure of the mixture, adjusting the flow, and stably adjusting the flow of the feed when the flow fluctuates or the feed changes in the rectifying tower 11, so as to maintain the stability of the operation in the tower.

[0112] Based on the electrolyte additive dehydration device 100 described above, the embodiment of the present application further provides a battery production system including the electrolyte additive dehydration device 100 described in the above technical solution.

[0113] In addition, the battery production system can further include an electrolyte preparation device (not shown in the figure) for mixing various electrolyte additives after dehydration to prepare an electrolyte.

[0114] Finally, please refer to the accompanying drawings Figures 1-4The embodiment of the present application provides a kind of electrolyte additive dewatering equipment 100, including vapor-liquid contactor 10 and first recovery device 20, vapor-liquid contactor 10 is used for the dehydration of electrolyte additive, vapor-liquid contactor 10 has opposite first end 10a and second end 10b, from first end 10a to second end 10b, vapor-liquid contactor 10 is equipped with first discharge port 101, first feed port 102, second feed port 103, first return port 104 and second discharge port 105, first discharge port 101 is used to discharge the electrolyte additive after dehydration, first feed port 102 is used to add dehydration auxiliary material, second feed port 103 is used to add electrolyte additive before dehydration;First recovery device 20 is connected with first return port 104 and second discharge port 105 respectively, and first recovery device 20 is used to carry out precipitation treatment to the dehydration auxiliary material flowed out of second discharge port 105, and dehydration auxiliary material after precipitation treatment is transported into vapor-liquid contactor 10 by first return port 104. Vapor-liquid contactor 10 includes rectifying column 11 and heating assembly 12, rectifying column 11 is equipped with first discharge port 101, first feed port 102, second feed port 103, first return port 104 and second discharge port 105, heating assembly 12 is connected with rectifying column 11, and is used to heat the substance in the component of rectifying column 11. Heating assembly 12 includes reboiler 121 and first circulating pump 122, rectifying column 11 is equipped with first circulation port 106 and second circulation port 107, reboiler 121 is connected between first circulation port 106 and first circulating pump 122 pipeline, and first circulating pipeline is connected with second circulation port 107 pipeline. Second circulation port 107 is opened in first end 10a, in the direction from first end 10a to second end 10b, first circulation port 106 is located between second circulation port 107 and first feed port 102. First recovery device 20 includes first condensing assembly 22, precipitation assembly 23 and second circulating pump 25, first condensing assembly 22, precipitation assembly 23 and second circulating pump 25 are sequentially connected by pipeline, first condensing assembly 22 is connected with second discharge port 105, and second circulating pump 25 is connected with first return port 104 by pipeline. Precipitation assembly 23 includes feed pipe 231 and precipitation mechanism 232, feed pipe 231 is connected between precipitation mechanism 232 and first condensing assembly 22, and precipitation mechanism 232 is configured to reduce the moisture content of dehydration auxiliary material.The precipitation mechanism 232 comprises a top wall 2321, a bottom wall 2322, and a first separation groove 2323, a feeding groove 2324 and a second separation groove 2325 arranged in sequence between the top wall 2321 and the bottom wall 2322 along a first direction X intersecting the arrangement direction of the top wall 2321 and the bottom wall 2322, the first separation groove 2323 has a first opening 23231 facing the top wall 2321, the feeding groove 2324 is provided with a second opening 23241 facing the top wall 2321 and communicating with the feeding pipe 231, the second separation groove 2325 has a third opening 23251 facing the top wall 2321, along the arrangement direction of the top wall 2321 and the bottom wall 2322, the distance between the first opening 23231 and the top wall 2321 is greater than the distance between the third opening 23251 and the top wall 2321, and the first separation groove 2323 communicates with the second circulating pump 25. The first recovery device 20 further comprises a sewage recovery assembly 26 communicating with the second separation groove 2325. The sewage recovery assembly 26 comprises a sewage recovery pipeline 261 and a first temporary storage container 262, and the first temporary storage container 262 is connected between the second separation groove 2325 and the sewage recovery pipeline. The first filler 2311 is installed in the feeding pipe 231. The first filler 2311 is located at one end of the feeding pipe 231 communicating with the precipitation mechanism 232, and the inner wall of the feeding pipe 231 is provided with a supporting member 2312 supporting the first filler 2311. The first recovery device 20 further comprises a second temporary storage container 27 connected between the precipitation assembly 23 and the second circulating pump 25. The electrolyte additive dewatering equipment 100 further comprises a second recovery device 30, the vapor-liquid contact device 10 is provided with a second recovery port 108 between the first recovery port 104 and the second discharge port 105, the second recovery device 30 communicates with the second recovery port 108, the second recovery device 30 recovers the dewatering auxiliary material of the second recovery port 108, and the dewatering auxiliary material is condensed and then transported to the vapor-liquid contact device 10 through the second recovery port 108. The second recovery device 30 comprises a second condensation assembly 31 and a third temporary storage container 32, and the second condensation assembly 31 is connected between the second recovery port 108 and the third temporary storage container 32.

[0115] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrolyte additive dehydration apparatus characterized by comprising: The application relates to a vapor-liquid contact device for electrolyte additive dehydration, which comprises a first end and a second end opposite to each other, a first discharge port, a first feeding port, a second feeding port, a first return port and a second discharge port arranged from the first end to the second end, wherein the first discharge port is used for discharging the dehydrated electrolyte additive, the first feeding port is used for adding dehydration auxiliary materials, and the second feeding port is used for adding the electrolyte additive before dehydration; and a first recovery device connected with the first return port and the second discharge port respectively, which is used for carrying out precipitation treatment on the dehydration auxiliary materials discharged from the second discharge port and conveying the dehydration auxiliary materials after the precipitation treatment to the vapor-liquid contact device through the first return port. The vapor-liquid contact device comprises a rectifying tower and a heating assembly, the rectifying tower is provided with the first discharge port, the first feeding port, the second feeding port, the first return port and the second discharge port, and the heating assembly is connected with the rectifying tower and used for heating the substances in the rectifying tower. The heating assembly comprises a reboiler and a first circulating pump, the rectifying tower is provided with a first circulating port and a second circulating port, the reboiler is connected with the first circulating port and the first circulating pump through pipelines respectively, and the first circulating pump is connected with the second circulating port through a pipeline.

2. The electrolyte additive dewatering apparatus according to claim 1, characterized by, The second circulating port is arranged at the first end, and the first circulating port is located between the second circulating port and the first feeding port along the direction from the first end to the second end.

3. The electrolyte additive dewatering apparatus according to claim 2, characterized by, The first recovery device comprises a first condensing assembly, a precipitation assembly and a second circulating pump, the first condensing assembly, the precipitation assembly and the second circulating pump are sequentially connected through pipelines, the first condensing assembly is connected with the second discharge port through a pipeline, and the second circulating pump is connected with the first return port through a pipeline.

4. The electrolyte additive dewatering apparatus according to claim 3, characterized by The precipitation assembly comprises a feeding pipe and a precipitation mechanism, the feeding pipe is connected between the precipitation mechanism and the first condensing assembly, and the precipitation mechanism is configured to reduce the moisture content of the dehydration auxiliary materials.

5. The electrolyte additive dewatering apparatus according to claim 1, wherein The precipitation mechanism comprises a top wall, a bottom wall and a first separation groove, a feeding groove and a second separation groove arranged in sequence between the top wall and the bottom wall along a first direction, the first direction intersects with the arrangement direction of the top wall and the bottom wall, the first separation groove is connected with the second circulating pump and has a first opening facing the top wall, the feeding groove is provided with a second opening facing the top wall and connected with the feeding pipe, the second separation groove has a third opening facing the top wall, and along the arrangement direction of the top wall and the bottom wall, the distance between the first opening and the top wall is greater than the distance between the third opening and the top wall.

6. The electrolyte additive dewatering apparatus according to claim 5, wherein The first recovery device further comprises a sewage recovery assembly connected with the second separation groove.

7. The electrolyte additive dewatering apparatus according to claim 6, wherein The sewage recovery assembly comprises a sewage recovery pipeline and a first temporary storage container connected between the second separation groove and the sewage recovery pipeline.

8. The electrolyte additive dewatering apparatus according to claim 7, wherein ​ 9. The electrolyte additive dewatering apparatus according to claim 8, wherein ​ 10. The electrolyte additive dewatering apparatus according to any one of claims 6 to 9, characterized by The first filler is arranged in the feed pipe to separate the water body and the dehydration auxiliary material.

11. The electrolyte additive dewatering apparatus according to claim 10, wherein The inner wall of the feed pipe is provided with a supporting member for supporting the first filler.

12. The electrolyte additive dewatering apparatus according to any one of claims 5 to 9, characterized by The first recycling device further comprises a second temporary storage container, which is connected between the precipitation assembly and the second circulating pump.

13. The electrolyte additive dewatering apparatus according to any one of claims 1 to 9, characterized by The electrolyte additive dehydration equipment further comprises a second recycling device, the vapor-liquid contact device is provided with a second recycling port between the first recycling port and the second discharging port, the second recycling device is connected with the second recycling port, the second recycling device is used for recycling the dehydration auxiliary material condensed by the second recycling port, and the dehydration auxiliary material after condensation is transported to the vapor-liquid contact device through the second recycling port.

14. The electrolyte additive dewatering apparatus according to claim 13, wherein The second recycling device comprises a second condensing assembly and a third temporary storage container, and the second condensing assembly is connected between the second recycling port and the third temporary storage container.

15. A battery production system characterized by comprising: The electrolyte additive dehydration equipment comprises the electrolyte additive dehydration equipment according to any one of claims 1-14.

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