Lithium salt mixing device and battery production line

Abstract

The embodiment of the utility model provides a lithium salt mixing device and a battery production line. The lithium salt mixing device comprises a feeding part and a stirring kettle, and the feeding part is used for feeding lithium salt; wherein a pre-dissolving kettle assembly is arranged between the feeding part and the stirring kettle, the pre-dissolving kettle assembly comprises a pre-dissolving kettle and a first circulating pipeline, the inlet end of the first circulating pipeline is communicated with a discharging opening of the pre-dissolving kettle, and the outlet end of the first circulating pipeline is communicated with a feeding opening of the pre-dissolving kettle; the feeding part and the stirring kettle are selectively connected or disconnected with the first circulating pipeline through the first valve assembly, and the pre-dissolving kettle is used for pre-mixing and dissolving lithium salt fed by the feeding part and a solvent in the pre-dissolving kettle. According to the technical scheme provided by the invention, the preparation efficiency of the electrolyte can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a lithium salt mixing device and a battery production line. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] The electrolyte is a crucial component of battery manufacturing. The main component of the electrolyte is lithium salt. During the electrolyte preparation process, the lithium salt is directly added to the reactor and mixed with the solution. This mixing process releases a large amount of heat. Existing production equipment suffers from problems such as delayed heat dissipation and prolonged heat dissipation, resulting in low electrolyte preparation efficiency. Utility Model Content

[0004] The present application provides a lithium salt mixing device and a battery production line, which can improve the efficiency of electrolyte preparation.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a lithium salt mixing device, which includes a feeding part and a stirring tank, and the feeding part is used to feed lithium salt; wherein a pre-dissolution kettle assembly is arranged between the feeding part and the stirring tank, and the pre-dissolution kettle assembly includes a pre-dissolution kettle and a first circulation pipeline, the inlet end of the first circulation pipeline is connected to the discharge port of the pre-dissolution kettle, and the outlet end of the first circulation pipeline is connected to the feed port of the pre-dissolution kettle, and the feeding part and the stirring tank can be selectively connected or disconnected with the first circulation pipeline through a first valve assembly, and the pre-dissolution kettle is used to pre-mix and dissolve the lithium salt fed from the feeding part with the solvent in the pre-dissolution kettle.

[0007] In this solution, a pre-dissolution kettle component is provided between the feeding part and the stirring kettle, and the solvents and additives required for the preparation of the electrolyte are added in two batches. The feeding part feeds the lithium salt into the pre-dissolution kettle, and pre-mixes and dissolves it with the solvent added in the first batch in the pre-dissolution kettle. The pre-solution obtained after pre-dissolution enters the stirring kettle, and then the second batch of solvents and additives are added to the stirring kettle in sequence. After dissolving and mixing with the pre-solution, the preparation of the electrolyte is completed. The feeding part can be connected to the first circulation pipeline. When the feeding part feeds lithium salt into the pre-dissolution kettle, the first circulation pipeline first circulates the solution in the pre-dissolution kettle in advance. In this way, the lithium salt fed by the feeding part is added through the first circulation pipeline, and the lithium salt will first be pre-dissolved with the solution in the first circulation pipeline. The liquid flowing in the first circulation pipeline dissolves the lithium salt in time, and the heat release is completed in advance. In addition, the solid lithium salt is added to the real-time flowing liquid, which can effectively avoid the phenomenon of high free acid due to uneven dissolution of the solid lithium salt. Then it enters the pre-dissolution kettle and undergoes secondary dissolution with the solution in the pre-dissolution kettle. Compared with the prior art in which the lithium salt is directly fed into the stirring kettle, the dissolution efficiency of the lithium salt is improved, the heat release rate is accelerated, and the production efficiency of the electrolyte preparation is correspondingly improved. Moreover, the first circulation pipeline works continuously, which not only allows the lithium salt to dissolve with the solvent in the first circulation pipeline to release heat before entering the pre-dissolution kettle, but also the first circulation pipeline puts the solution in the pre-dissolution kettle in a state of internal circulation and continuous heat exchange, thereby increasing the heat exchange rate between the lithium salt and the solution in the pre-dissolution kettle, correspondingly increasing the dissolution rate of the lithium salt, and improving the production efficiency of the electrolyte preparation.

[0008] According to some embodiments of the present application, a first circulation pump is provided on the first circulation pipeline, and the first circulation pump is used to provide power to flow the fluid in the first circulation pipeline from the inlet end to the outlet end.

[0009] In the above solution, a first circulation pump is provided on the first circulation line. The first circulation pump can provide power to flow the solution in the pre-dissolution kettle from the inlet end of the first circulation line to the outlet end of the first circulation line and then re-enter the pre-dissolution kettle, thereby achieving circulation of the solution in the pre-dissolution kettle. Furthermore, by controlling the first valve assembly, the first circulation pump provides power to transfer the solution in the pre-dissolution kettle to the stirring kettle, thereby achieving transfer of the pre-dissolution solution in the pre-dissolution kettle.

[0010] According to some embodiments of the present application, the first valve assembly includes a first valve, a second valve and a third valve. The stirring tank is connected to the first circulation pipeline through a discharge pipeline, and the first valve is arranged on the discharge pipeline; the second valve is arranged on the first circulation pipeline and is located between the discharge pipeline and the outlet end of the first circulation pipeline; the third valve is arranged on the feeding pipeline of the feeding part, the feeding pipeline is connected to the first circulation pipeline, and is located between the second valve on the first circulation pipeline and the outlet end of the first circulation pipeline.

[0011] In the above scheme, by setting the first valve, the second valve, and the third valve, when lithium salt is added to the feeding part, the first valve is closed and the second and third valves are opened. The first circulation pipeline can suck the solution in the pre-dissolving kettle from the discharge port of the pre-dissolving kettle to the feed port of the pre-dissolving kettle, realizing the circulation of the solution in the pre-dissolving kettle. The lithium salt can be added to the first circulation pipeline and enter the pre-dissolving kettle along with the solution in the first circulation pipeline. After the lithium salt is added, the first and third valves are closed and the second valve is opened, and the first circulation pipeline realizes the internal circulation of the solution in the pre-dissolving kettle. When the solution in the pre-dissolving kettle needs to be transferred to the stirring kettle, the first valve is opened and the second and third valves are closed. The first circulation pipeline is connected to the discharge pipeline.

[0012] According to some embodiments of the present application, the height of the feeding part is higher than the feeding port of the pre-dissolution kettle.

[0013] In the above scheme, by setting the height of the feeding part higher than the feeding port of the pre-dissolution kettle, when lithium salt is added through the feeding part, the gravitational potential energy difference can be used to achieve the addition of lithium salt, thereby reducing the probability of blockage of the feeding pipeline of the feeding part.

[0014] According to some embodiments of the present application, a concentration measuring component is provided in the pre-dissolution kettle, and the concentration measuring component is used to monitor the concentration of the pre-solution in the pre-dissolution kettle.

[0015] In the above scheme, by arranging a concentration measuring component in the pre-dissolution kettle, the concentration measuring component can monitor the concentration of the pre-solution in the pre-dissolution kettle, and then calculate the solid salt content according to the flow rate of the solution, so that the operator can take the next step in time according to the concentration of the pre-solution.

[0016] According to some embodiments of the present application, a temperature sensor is provided on the first circulation pipeline, and the temperature sensor is used to monitor the temperature of the liquid in the first circulation pipeline.

[0017] In the above scheme, a temperature sensor is provided on the first circulation pipeline to monitor the temperature of the liquid in the first circulation pipeline, so that the circulation speed of the first circulation pipeline or the salt addition speed can be controlled according to the temperature of the liquid, thereby controlling the temperature of the pre-solution within a suitable range. There is no need for manual sampling to measure the temperature of the liquid in the first circulation pipeline, and automatic control is easy to achieve.

[0018] According to some embodiments of the present application, the pre-dissolution kettle includes a first wall and a second wall, a first heat dissipation cavity is defined between the first wall and the second wall, and the first heat dissipation cavity is provided with a first cooling water pipeline assembly.

[0019] In the above scheme, by arranging a first cooling water pipeline assembly in the pre-dissolution kettle, the heat in the pre-dissolution kettle contacts the first cooling water pipeline assembly through the inner wall of the pre-dissolution kettle to realize heat exchange with the cooling water in the first cooling water pipeline assembly, thereby accelerating the heat dissipation speed of the solution in the pre-dissolution kettle, improving the heat dissipation efficiency of the pre-dissolution kettle, and ensuring the production stability of the pre-dissolution kettle.

[0020] According to some embodiments of the present application, the lithium salt mixing device also includes a controller, and the concentration measuring component, the temperature sensor, the first cooling water pipeline assembly, the first circulation pump and the first valve assembly are all electrically connected to the controller; the controller is used to control the first circulation pump, the first cooling water pipeline assembly and / or the first valve assembly according to the monitoring data of the concentration measuring component and / or the temperature sensor.

[0021] In the above scheme, the concentration measuring component, the temperature sensor, the first cooling water pipeline assembly, the first circulation pump and the first valve assembly are all electrically connected to the controller, so that the controller can automatically control the first circulation pump, the first cooling water pipeline assembly and / or the first valve assembly in real time according to the data monitored by the concentration measuring component and the temperature sensor, thereby realizing automatic control of the pre-dissolution kettle assembly.

[0022] According to some embodiments of the present application, a filter assembly and a magnetic rod are provided between the inlet end of the first circulation pipeline and the discharge pipeline.

[0023] In the above solution, by arranging the filter assembly and the magnetic rod on the first circulation pipeline, the filter assembly and the magnetic rod can filter and demagnetize the solution circulating in the first circulation pipeline, thereby improving the quality of the pre-solution.

[0024] According to some embodiments of the present application, a flow meter is provided on the discharge pipeline.

[0025] In the above solution, by arranging a flow meter on the discharge pipeline, the flow meter can measure the pre-solution transferred from the pre-dissolution kettle to the stirring kettle, thereby facilitating automatic control.

[0026] According to some embodiments of the present application, the lithium salt mixing device also includes a finished product tank, the feed port of the finished product tank is connected to the discharge port of the stirring tank; a second circulation pipeline and a second circulation pump arranged on the second circulation pipeline are provided on the outside of the stirring tank, and the two ends of the second circulation pipeline are respectively connected to the top and bottom sides of the stirring tank; the feed port of the finished product tank can be selectively connected to or disconnected with the second circulation pipeline through a fourth valve.

[0027] In the above scheme, after the pre-solution transferred from the pre-dissolution kettle enters the stirring kettle, the remaining solvent for electrolyte preparation is continuously added to the stirring kettle, and the pre-solution is dissolved and mixed with the pre-solution for a second time to obtain the electrolyte. By providing a second circulation pipeline and a second circulation pump in the stirring kettle, the pre-solution will also generate a large amount of heat during the dissolution process of the stirring kettle and the remaining solvent. The second circulation pipeline can play the role of internal circulation of the solution in the stirring kettle, accelerating the dissolution rate and heat dissipation speed of the solution in the stirring kettle. After the electrolyte is prepared, the fourth valve is opened to transfer the electrolyte prepared in the stirring kettle to the finished product tank, which serves as a temporary storage for the electrolyte.

[0028] According to some embodiments of the present application, the stirred tank includes a third wall and a fourth wall, a second heat dissipation cavity is defined between the third wall and the fourth wall, and a second cooling water pipeline assembly is provided in the second heat dissipation cavity.

[0029] In the above scheme, by arranging a second cooling water pipeline assembly in the stirring kettle, the heat in the stirring kettle is exchanged with the cooling water in the second cooling water pipeline assembly through the inner wall, thereby accelerating the heat dissipation speed of the solution in the stirring kettle, improving the heat dissipation efficiency of the stirring kettle, and ensuring the production stability of the stirring kettle.

[0030] According to some embodiments of the present application, a first stirring component is provided in the stirring kettle, and the first stirring component is used to stir the solution in the stirring kettle; a second stirring component is provided in the pre-dissolution kettle, and the second stirring component is used to stir the solution in the pre-dissolution kettle.

[0031] In the above solution, by providing a first stirring assembly within the stirring vessel, the first stirring assembly can stir the solution within the stirring vessel, thereby accelerating the mixing speed of the solution, shortening the mixing time, and improving production efficiency. Similarly, by providing a second stirring assembly within the pre-dissolution vessel, the second stirring assembly can pre-stir and dissolve the lithium salt added from the feeding unit with the solvent within the pre-dissolution vessel, thereby accelerating the mixing speed, shortening the mixing time, and improving production efficiency.

[0032] In a second aspect, an embodiment of the present application further provides a battery production line, which includes the lithium salt mixing device of any of the aforementioned embodiments.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 This is a schematic structural diagram of a lithium salt mixing device according to some embodiments of the present application;

[0036] Figure 2 This is a schematic structural diagram of a pre-dissolving kettle assembly in a lithium salt mixing device in some embodiments of the present application;

[0037] Figure 3 This is a control schematic diagram of the pre-dissolution kettle assembly in the lithium salt mixing device of some embodiments of the present application.

[0038] Icons: 100-lithium salt mixing device; 10-feeding part; 20-pre-dissolution kettle assembly; 21-pre-dissolution kettle; 211-first cooling water pipeline assembly; 22-first circulation pipeline; 23-first circulation pump; 24-discharge pipeline; 25-feeding pipeline; 26-filtration assembly; 27-magnetic rod; 28-second stirring assembly; 30-stirring kettle; 31-second cooling water pipeline assembly; 32-second circulation pipeline; 33-first stirring assembly; 34-second circulation pump; 40-concentration measuring component; 41-temperature sensor; 42-controller; 43-flow meter; 50-first valve assembly; 51-first valve; 52-second valve; 53-third valve; 54-fourth valve; 60-finished product tank; 70-automatic filling machine. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0041] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0043] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0044] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0045] Currently, electrolyte is a critical component in battery manufacturing. The main component of the electrolyte is lithium salt. During the electrolyte preparation process, the lithium salt is directly added to the reactor and mixed with the solution. This mixing process releases a large amount of heat. Existing production equipment suffers from problems such as untimely and prolonged heat dissipation, resulting in low electrolyte production efficiency and safety issues.

[0046] Based on the above considerations, in order to better improve the production efficiency of electrolyte preparation, the present application designs a lithium salt mixing device, which includes a feeding part and a stirring tank. The feeding part is used to feed lithium salt; a pre-dissolution kettle assembly is arranged between the feeding part and the stirring tank, and the pre-dissolution kettle assembly includes a pre-dissolution kettle and a first circulation pipeline. The inlet end of the first circulation pipeline is connected to the discharge port of the pre-dissolution kettle, and the outlet end of the first circulation pipeline is connected to the feed port of the pre-dissolution kettle. The feeding part and the stirring tank can be selectively connected or disconnected with the first circulation pipeline through the first valve assembly. The pre-dissolution kettle is used to pre-mix and dissolve the lithium salt fed from the feeding part with the solvent in the pre-dissolution kettle.

[0047] In such a lithium salt mixing device, a pre-dissolving kettle assembly is provided between the feeding section and the stirring kettle, so that the solvents and additives required for electrolyte preparation are added in two batches. The feeding section feeds the lithium salt into the pre-dissolving kettle, where it is pre-mixed and dissolved with the solvent added in the first batch in the pre-dissolving kettle. The pre-dissolved solution obtained after pre-dissolution enters the stirring kettle. The first circulation pipeline pre-circulates the solution in the pre-dissolving kettle. In this way, the lithium salt fed by the feeding section is added through the first circulation pipeline. The lithium salt will first be pre-dissolved with the solution in the first circulation pipeline. The liquid flowing in the first circulation pipeline dissolves the lithium salt in time, completing heat release in advance. The solid lithium salt is added to the real-time flowing liquid and then enters the pre-dissolving kettle for secondary dissolution with the solution in the pre-dissolving kettle. This improves the dissolution efficiency of the lithium salt, accelerates the heat release rate, and correspondingly improves the production efficiency of the electrolyte preparation.

[0048] This embodiment of the application provides a lithium salt mixing device, please refer to Figure 1 、 Figure 2 and Figure 3 The lithium salt mixing device 100 includes a feeding part 10 and a stirring tank 30. The feeding part 10 is used to feed lithium salt; wherein, a pre-dissolving tank assembly 20 is provided between the feeding part 10 and the stirring tank 30. The pre-dissolving tank assembly 20 includes a pre-dissolving tank 21 and a first circulation pipeline 22. The inlet end of the first circulation pipeline 22 is connected to the discharge port of the pre-dissolving tank 21, and the outlet end of the first circulation pipeline 22 is connected to the feed port of the pre-dissolving tank 21. The feeding part 10 and the stirring tank 30 can be selectively connected or disconnected with the first circulation pipeline 22 through the first valve assembly 50. The pre-dissolving tank 21 is used to pre-mix and dissolve the lithium salt fed from the feeding part 10 with the solvent in the pre-dissolving tank 21.

[0049] The feeding section 10 is a storage container for lithium salt. It has the function of adding solid lithium salt to the pre-dissolving vessel 21. The feeding section 10 is a DCS automatic salt addition system. The first circulation line 22 allows the solution in the pre-dissolving vessel 21 to be recirculated by passing it from the discharge port of the pre-dissolving vessel 21 through the first circulation line 22 and then back into the pre-dissolving vessel 21 through the feed port of the pre-dissolving vessel 21, thereby circulating the solution in the pre-dissolving vessel 21.

[0050] It is understood that during the preparation of the electrolyte, in addition to adding lithium salt, multiple solvents and additives need to be added in a predetermined order in different time periods. The pre-dissolving vessel 21 is disposed at the front end of the stirring vessel 30. Before adding the lithium salt to the pre-dissolving vessel 21, the first batch of solvents and / or additives required for the front end of the electrolyte preparation are first added to the pre-dissolving vessel 21 and dissolved with the condensed water. The solution in the pre-dissolving vessel 21 is then circulated through the first circulation line 22. In this way, the lithium salt added by the feeding unit 10 is added to the solution flowing in the first circulation line 22 and can be added to the pre-dissolving vessel 21 along with the solution.

[0051] After the pre-solution in the pre-dissolution kettle 21 meets the transfer requirements, the pre-solution in the pre-dissolution kettle 21 is transferred to the stirring kettle 30 through the first circulation pipeline 22, and then the second batch of solvents and additives required for electrolyte preparation are added in sequence in the stirring kettle 30, and the preparation of the electrolyte is completed in the stirring kettle 30. That is, in this solution, through the setting of the pre-dissolution kettle 21 and the stirring kettle 30, the solvents and additives required for electrolyte preparation can be added in two stages. And in actual applications, the volume of the pre-dissolution kettle 21 is controlled to be an integer multiple of the volume of the stirring kettle 30, so that a pre-dissolution kettle 21 can supply multiple stirring kettles 30 and supply pre-solution to multiple stirring kettles 30. Not only is the safety of the electrolyte preparation process improved, but also the efficiency of electrolyte preparation is improved.

[0052] In this solution, a pre-dissolution kettle assembly 20 is provided between the feeding part 10 and the stirring kettle 30, and the solvents and additives required for the preparation of the electrolyte are added in two batches. The feeding part 10 feeds the lithium salt into the pre-dissolution kettle 21, and pre-mixes and dissolves it with the solvent of the first batch added in the pre-dissolution kettle 21. The pre-solution obtained after pre-dissolution enters the stirring kettle 30, and then the second batch of solvents and additives are added to the stirring kettle 30 in sequence. After being dissolved and mixed with the pre-solution, the preparation of the electrolyte is completed. The feeding part 10 can be connected to the first circulation pipeline 22. When the feeding part 10 feeds lithium salt into the pre-dissolution kettle 21, the first circulation pipeline 22 first circulates the solution in the pre-dissolution kettle 21 in advance. In this way, the lithium salt fed by the feeding part 10 is added through the first circulation pipeline 22. The lithium salt will first be pre-dissolved with the solution in the first circulation pipeline 22. The liquid flowing in the first circulation pipeline 22 dissolves the lithium salt in time, completes the heat release in advance, and the solid lithium salt is added to the real-time flowing liquid, which can effectively avoid the phenomenon of uneven dissolution of the solid lithium salt leading to high free acid. Then, it enters the pre-dissolution kettle 21 for secondary dissolution with the solution in the pre-dissolution kettle 21. Compared with the prior art in which the lithium salt is directly fed into the stirring kettle 30, the dissolution efficiency of the lithium salt is improved, the heat release rate is accelerated, and the production efficiency of the electrolyte preparation is correspondingly improved. Moreover, the first circulation pipeline 22 operates continuously, which not only allows the lithium salt to dissolve with the solvent in the first circulation pipeline 22 and release heat before entering the pre-dissolution kettle 21, but also the first circulation pipeline 22 puts the solution in the pre-dissolution kettle 21 in a state of internal circulation and continuous heat exchange, thereby increasing the heat exchange rate between the lithium salt and the solution in the pre-dissolution kettle 21, correspondingly increasing the dissolution rate of the lithium salt, and improving the production efficiency of the electrolyte preparation.

[0053] According to some embodiments of the present application, a first circulation pump 23 is provided on the first circulation pipeline 22 , and the first circulation pump 23 is used to provide power to flow the fluid in the first circulation pipeline 22 from the inlet end to the outlet end.

[0054] The first circulation pump 23 has a conventional pump structure and is disposed on the first circulation line 22. The first circulation pump 23 provides power to pump the solution in the pre-dissolution kettle 21 from the discharge port to the feed port of the pre-dissolution kettle 21. The first valve assembly 50 is a valve disposed on the first circulation line 22. The first valve assembly 50 may include multiple valves, which can cooperate with each other to complete the on-off control of the first circulation line 22, the first circulation line 22, the stirring kettle 30, and the feeding section 10.

[0055] By providing a first circulation pump 23 on the first circulation line 22, the first circulation pump 23 can provide power to flow the solution in the pre-dissolution kettle 21 from the inlet end of the first circulation line 22 to the outlet end of the first circulation line 22 and then re-enter the pre-dissolution kettle 21, thereby achieving circulation of the solution in the pre-dissolution kettle 21. Furthermore, by controlling the first valve assembly 50, the first circulation pump 23 provides power to transfer the solution in the pre-dissolution kettle 21 to the stirring kettle 30, thereby achieving transfer of the pre-dissolution solution in the pre-dissolution kettle 21.

[0056] According to some embodiments of the present application, the first valve assembly 50 includes a first valve 51, a second valve 52 and a third valve 53. The stirred tank 30 is connected to the first circulation pipeline 22 through the discharge pipeline 24, and the first valve 51 is arranged on the discharge pipeline 24; the second valve 52 is arranged on the first circulation pipeline 22 and is located between the discharge pipeline 24 and the outlet end of the first circulation pipeline 22; the third valve 53 is arranged on the feeding pipeline 25 of the feeding part 10, the feeding pipeline 25 is connected to the first circulation pipeline 22, and is located between the second valve 52 on the first circulation pipeline 22 and the outlet end of the first circulation pipeline 22.

[0057] The first valve 51, the second valve 52, and the third valve 53 are all solenoid valves that can be automatically opened or closed by the controller 42. The third valve 53 is a one-way valve that only allows the lithium salt in the feeding section 10 to enter the first circulation pipeline 22 and prevents the liquid in the first circulation pipeline 22 from entering the feeding section 10 in the reverse direction.

[0058] By configuring the first valve 51, the second valve 52, and the third valve 53, when lithium salt is added to the feeding section 10, the first valve 51 is closed, and the second and third valves 52, 53 are opened. The first circulation line 22 can pump the solution in the pre-dissolving kettle 21 from the discharge port of the pre-dissolving kettle 21 to the feed port of the pre-dissolving kettle 21, thereby achieving circulation of the solution in the pre-dissolving kettle 21. The lithium salt can be added to the first circulation line 22 and enter the pre-dissolving kettle 21 along with the solution in the first circulation line 22. After the lithium salt is added, the first valve 51 and the third valve 53 are closed, and the second valve 52 is opened, achieving internal circulation of the solution in the pre-dissolving kettle 21 in the first circulation line 22. When the solution in the pre-dissolving kettle 21 needs to be transferred to the stirring kettle 30, the first valve 51 is opened, and the second and third valves 52, 53 are closed. The first circulation line 22 is then connected to the discharge line 24.

[0059] According to some embodiments of the present application, the height of the feeding part 10 is higher than the feeding port of the pre-dissolution kettle 21 .

[0060] The installation position of the feeding part 10 is about 10m higher than the pre-dissolving kettle 21. The salt is added by utilizing the gravity potential energy difference, which prevents the lithium salt feeding pipeline from being blocked and eliminates the device of hitting the pipeline with an air hammer.

[0061] By setting the height of the feeding part 10 higher than the feeding port of the pre-dissolution kettle 21, when lithium salt is added through the feeding part 10, the gravitational potential energy difference can be used to achieve the addition of lithium salt, thereby reducing the probability of blockage of the feeding pipeline 25 of the feeding part 10.

[0062] Of course, both the feeding part 10 and the pre-dissolving kettle 21 are connected to a nitrogen pressurizing system. When lithium salt is added to the feeding part 10, the nitrogen pressurizing system pressurizes the feeding part 10 and reduces the pressure in the pre-dissolving kettle 21, keeping the pressure in the feeding part 10 greater than the pressure in the pre-dissolving kettle 21. The third valve 53 is opened, and the lithium salt enters the first circulation pipeline 22 through the potential energy difference + pressure difference and then enters the pre-dissolving kettle 21.

[0063] According to some embodiments of the present application, a concentration measuring component 40 is provided in the pre-dissolution kettle 21 , and the concentration measuring component 40 is used to monitor the concentration of the pre-solution in the pre-dissolution kettle 21 .

[0064] The concentration measuring component 40 is a measuring component capable of monitoring the concentration of the solution. The concentration measuring component 40 may be an online concentration meter.

[0065] By arranging a concentration measuring component 40 in the pre-dissolution kettle 21, the concentration measuring component 40 can monitor the concentration of the pre-solution in the pre-dissolution kettle 21, and then calculate the content of solid salt according to the flow rate of the solution, so that the operator can take the next step in time according to the concentration of the pre-solution.

[0066] According to some embodiments of the present application, a temperature sensor 41 is provided on the first circulation pipeline 22 , and the temperature sensor 41 is used to monitor the temperature of the liquid in the first circulation pipeline 22 .

[0067] A temperature transducer 41 is a sensor that senses temperature and converts it into a usable output signal. Temperature sensors 41 are the core component of temperature measurement instruments and come in a wide variety. They can be categorized by measurement method: contact and non-contact. They can also be divided into RTDs and thermocouples based on sensor material and electronic component characteristics.

[0068] By arranging a temperature sensor 41 on the first circulation pipeline 22 to monitor the temperature of the liquid in the first circulation pipeline 22, it is convenient to control the circulation speed of the first circulation pipeline 22 or the speed of adding salt according to the temperature of the liquid, so as to control the temperature of the pre-solution within a suitable range. There is no need for manual sampling to measure the temperature of the liquid in the first circulation pipeline 22, and automatic control is easy to achieve.

[0069] According to some embodiments of the present application, the pre-dissolution kettle 21 includes a first wall and a second wall, a first heat dissipation cavity is defined between the first wall and the second wall, and the first heat dissipation cavity is provided with a first cooling water pipeline assembly 211.

[0070] The first wall refers to the inner circumferential wall of the pre-dissolution kettle 21, and the second wall refers to the outer circumferential wall of the pre-dissolution kettle 21. A first heat dissipation cavity is defined between the inner circumferential wall and the outer circumferential wall of the pre-dissolution kettle 21. The first heat dissipation cavity provides an installation space for the first cooling water pipeline assembly 211, and the first cooling water pipeline assembly 211 is installed in the first heat dissipation cavity.

[0071] The cooling water pipe of the first cooling water pipe assembly 211 is a coil structure. It includes a water cooling pipe, a water pump, and a water tank. The water pump pumps cooling water from the water tank to the water cooling pipe, whose outlet is connected to the water tank. The first cooling water pipe assembly 211 is a conventional water cooling system, and the detailed structure of the first cooling water pipe assembly 211 will not be described in detail here.

[0072] By arranging a first cooling water pipeline assembly 211 in the pre-dissolution kettle 21, the heat in the pre-dissolution kettle 21 contacts the first cooling water pipeline assembly 211 through the inner wall of the pre-dissolution kettle 21 to achieve heat exchange with the cooling water in the first cooling water pipeline assembly 211, thereby accelerating the heat dissipation speed of the solution in the pre-dissolution kettle 21, improving the heat dissipation efficiency of the pre-dissolution kettle 21, and ensuring the production stability of the pre-dissolution kettle 21.

[0073] According to some embodiments of the present application, the lithium salt mixing device 100 also includes a controller 42, and the concentration measuring component 40, the temperature sensor 41, the first cooling water pipeline assembly 211, the first circulation pump 23 and the first valve assembly 50 are all electrically connected to the controller 42; the controller 42 is used to control the first circulation pump 23, the first cooling water pipeline assembly 211 and / or the first valve assembly 50 according to the monitoring data of the concentration measuring component 40 and / or the temperature sensor 41.

[0074] The controller 42 is the master device that controls the motor's starting, speed regulation, braking, and reversing by changing the wiring of the main or control circuits and the resistance values ​​in a predetermined sequence. Composed of a program counter, instruction register, instruction decoder, timing generator, and operation controller 42, it is the "decision-making body" that issues commands, effectively coordinating and directing the entire computer system's operations.

[0075] In this embodiment, controller 42 is a PLC. A programmable logic controller (PLC) is a digital computing electronic system designed specifically for industrial applications. It uses a programmable memory to store instructions for performing logic operations, sequence control, timing, counting, and arithmetic operations. It controls various types of machinery or production processes through digital or analog input and output.

[0076] The concentration measuring component 40, the temperature sensor 41, the first cooling water pipeline assembly 211, the first circulation pump 23 and the first valve assembly 50 are all electrically connected to the controller 42, so that the controller 42 can automatically control the first circulation pump 23, the first cooling water pipeline assembly 211 and / or the first valve assembly 50 in real time according to the data monitored by the concentration measuring component 40 and the temperature sensor 41, thereby realizing automatic control of the pre-dissolution kettle assembly 20.

[0077] For example, when the temperature sensor 41 detects that the temperature of the liquid in the first circulation pipeline 22 is high, the controller 42 can increase the power of the first circulation pump 23 and / or the first cooling water pipeline to regulate the heat release rate of the liquid in the first circulation pipeline 22 and / or accelerate the circulation rate of the cooling water in the first cooling water pipeline, thereby ensuring production stability in the pre-dissolution kettle 21. Alternatively, when the concentration measurement component 40 detects that the concentration of the solution in the pre-dissolution kettle 21 has reached a preset range and the temperature of the solution has dropped to an appropriate range, the controller 42 can control the first valve assembly 50 to connect the first circulation pipeline 22 with the discharge pipeline 24, thereby transferring the pre-dissolution solution in the pre-dissolution kettle 21 to the stirring kettle 30.

[0078] According to some embodiments of the present application, a filter assembly 26 and a magnetic rod 27 are provided between the inlet end of the first circulation pipeline 22 and the discharge pipeline 24 .

[0079] The filter assembly 26 can be a filter element, and the filter assembly 26 can include a two-stage filter element. The magnetic rod 27 plays a magnetic absorption function and can absorb the magnetic elements contained in the liquid in the first circulation pipeline 22.

[0080] By arranging the filter assembly 26 and the magnetic rod 27 on the first circulation pipeline 22, the filter assembly 26 and the magnetic rod 27 can filter and demagnetize the solution circulating in the first circulation pipeline 22, thereby improving the quality of the pre-solution.

[0081] According to some embodiments of the present application, a flow meter 43 is provided on the discharge pipeline 24 .

[0082] By arranging the flow meter 43 on the discharge pipe 24, the flow meter 43 can measure the pre-solution transferred from the pre-dissolution kettle 21 to the stirring kettle 30, thereby facilitating automatic control.

[0083] According to some embodiments of the present application, the lithium salt mixing device 100 also includes a finished product tank 60, the feed port of the finished product tank 60 is connected to the discharge port of the stirring tank 30; a second circulation pipeline 32 and a second circulation pump 34 arranged on the second circulation pipeline 32 are provided on the outside of the stirring tank 30, and the two ends of the second circulation pipeline 32 are respectively connected to the top and bottom sides of the stirring tank 30; the feed port of the finished product tank 60 can be selectively connected to or disconnected with the second circulation pipeline 32 through a fourth valve 54.

[0084] The finished product tank 60 is a container that can temporarily store the prepared electrolyte. The second circulation pump 34 has a conventional pump structure and is located on the second circulation line 32. It provides power to the solution in the second circulation line 32, pumping the solution in the stirred tank 30 from the bottom outlet of the stirred tank 30 to the top of the stirred tank 30 and then returning it to the stirred tank 30, thereby achieving the circulation function of the solution in the stirred tank 30. The fourth valve 54 can be a solenoid valve. The fourth valve 54 is located between the second circulation line 32 and the feed port of the finished product tank 60. When the solution in the stirred tank 30 meets the requirements, the fourth valve 54 is opened, and the electrolyte in the stirred tank 30 enters the finished product tank 60 through the second circulation line 32 for storage. The rear end of the finished product tank 60 is connected to an automatic filling machine 70.

[0085] After the pre-solution transferred from the pre-dissolution tank 21 enters the stirring tank 30, the remaining solvent required for electrolyte preparation is continuously added to the stirring tank 30 for secondary dissolution and mixing with the pre-solution to obtain the electrolyte. By providing a second circulation pipeline 32 and a second circulation pump 34 within the stirring tank 30, the pre-solution will also generate a large amount of heat during the dissolution process with the remaining solvent and additives in the stirring tank 30. The second circulation pipeline 32 can perform an internal circulation function for the solution in the stirring tank 30, accelerating the dissolution rate and heat dissipation speed of the solution in the stirring tank 30. After the electrolyte preparation is completed, the fourth valve 54 is opened to transfer the prepared electrolyte in the stirring tank 30 to the finished product tank 60, which serves as a temporary storage for the electrolyte.

[0086] According to some embodiments of the present application, the stirred tank 30 includes a third wall and a fourth wall, and a second heat dissipation cavity is defined between the third wall and the fourth wall. A second cooling water pipeline assembly 31 is provided in the second heat dissipation cavity.

[0087] The third wall refers to the inner circumferential wall of the stirring kettle 30, and the fourth wall refers to the outer circumferential wall of the stirring kettle 30. A second heat dissipation cavity is defined between the inner circumferential wall and the outer circumferential wall of the stirring kettle 30. The second heat dissipation cavity provides an installation space for the second cooling water pipeline assembly 31, and the second cooling water pipeline assembly 31 is installed in the second heat dissipation cavity.

[0088] The cooling water pipe of the second cooling water pipe assembly 31 is a coiled structure. It includes a water cooling pipe, a water pump, and a water tank. The water pump pumps cooling water from the water tank to the water cooling pipe, whose outlet is connected to the water tank. The second cooling water pipe assembly 31 is a conventional water cooling system, so the detailed structure of the second cooling water pipe assembly 31 will not be described in detail here.

[0089] By arranging a second cooling water pipeline assembly 31 in the stirring kettle 30, the heat in the stirring kettle 30 is exchanged with the cooling water in the second cooling water pipeline assembly 31 through the inner wall, thereby accelerating the heat dissipation speed of the solution in the stirring kettle 30, improving the heat dissipation efficiency of the stirring kettle 30, and ensuring the production stability of the stirring kettle 30.

[0090] According to some embodiments of the present application, a first stirring component 33 is provided in the stirring tank 30, and the first stirring component 33 is used to stir the solution in the stirring tank 30; a second stirring component 28 is provided in the pre-dissolution tank 21, and the second stirring component 28 is used to stir the solution in the pre-dissolution tank 21.

[0091] The first stirring assembly 33 includes a first motor, a first stirring shaft, and a first stirring blade. The drive shaft of the first motor is connected to the first stirring shaft, which is installed in the stirring vessel 30. The first stirring blade is provided on the first stirring shaft. The first motor drives the first stirring shaft to rotate along its axis, thereby driving the first stirring blade to rotate and stir and mix the solution in the stirring vessel 30. The second stirring assembly 28 includes a second motor, a second stirring shaft, and a second stirring blade. The drive shaft of the second motor is connected to the second stirring shaft, which is rotatably installed in the pre-dissolved vessel 21. The second stirring blade is provided on the second stirring shaft. The second motor drives the second stirring shaft to rotate along its axis, thereby driving the second stirring blade to rotate and stir and mix the solution in the pre-dissolved vessel 21.

[0092] By providing a first stirring assembly 33 within the stirring vessel 30, the first stirring assembly 33 can stir the solution within the stirring vessel 30, thereby accelerating the mixing speed of the solution, shortening the mixing time, and improving production efficiency. Similarly, by providing a second stirring assembly 28 within the pre-dissolution vessel 21, the second stirring assembly 28 can pre-stir and dissolve the lithium salt added from the feeding section 10 with the solvent within the pre-dissolution vessel 21, thereby accelerating the mixing speed, shortening the mixing time, and improving production efficiency.

[0093] The process of the lithium salt mixing device is as follows:

[0094] The first batch of solvent is added to the pre-dissolver 21, the second stirring component 28 is turned on, and the condensing water is turned on; the solution is cooled to the salting temperature. The feeding unit 10 is pressurized with nitrogen, the pre-dissolver 21 is vented and depressurized, the first circulation pump 23 is turned on, and the feeding unit 10 automatically adds salt via the DCS, and lithium salt is added to the pre-dissolver 21 through the first circulation pipeline 22. After the salting is completed, the third valve 53 and the vent valve of the pre-dissolver 21 are closed, and the solution is stirred evenly using the second stirring component 28. Samples are taken for inspection. After the samples pass the monitoring, the pre-dissolver 21 is pressurized, and the pre-solution is transferred to the stirring tank 30 through the first circulation pipeline 22. The second batch of solvent and additives are added to the stirring tank 30. The second stirring component 28 stirs the solution in the stirring tank 30 evenly to obtain the electrolyte. After passing the inspection, it is transferred to the finished product tank 60.

[0095] An embodiment of the present application further provides a battery production line, which includes the lithium salt mixing device 100 of any of the aforementioned embodiments.

[0096] In some embodiments, the present application provides a lithium salt mixing device, please refer to Figures 1 to 3 The lithium salt mixing device 100 includes a feeding part 10 and a stirring tank 30. The feeding part 10 is used to feed lithium salt; wherein, a pre-dissolving tank assembly 20 is provided between the feeding part 10 and the stirring tank 30, and the pre-dissolving tank assembly 20 includes a pre-dissolving tank 21, a first circulation pipeline 22 and a first circulation pump 23. The inlet end of the first circulation pipeline 22 is connected to the discharge port of the pre-dissolving tank 21, and the outlet end of the first circulation pipeline 22 is connected to the feed port of the pre-dissolving tank 21. The first circulation pump 23 is used to provide power to flow the fluid in the first circulation pipeline 22 from the inlet end to the outlet end; the feeding part 10 and the stirring tank 30 can be selectively connected or disconnected with the first circulation pipeline 22 through the first valve assembly 50. The pre-dissolving tank 21 is used to pre-mix and dissolve the lithium salt fed from the feeding part 10 with the solvent in the pre-dissolving tank 21. The first valve assembly 50 includes a first valve 51, a second valve 52 and a third valve 53. The stirred tank 30 is connected to the first circulation pipeline 22 through the discharge pipeline 24. The first valve 51 is arranged on the discharge pipeline 24; the second valve 52 is arranged on the first circulation pipeline 22 and is located between the discharge pipeline 24 and the outlet end of the first circulation pipeline 22; the third valve 53 is arranged on the feeding pipeline 25 of the feeding part 10. The feeding pipeline 25 is connected to the first circulation pipeline 22 and is located between the second valve 52 on the first circulation pipeline 22 and the outlet end of the first circulation pipeline 22.

[0097] By setting a pre-dissolution kettle assembly 20 between the feeding part 10 and the stirring kettle 30, the solvents and additives required for the preparation of the electrolyte are added in two batches. The feeding part 10 feeds the lithium salt into the pre-dissolution kettle 21, and pre-mixes and dissolves it with the solvent of the first batch added in the pre-dissolution kettle 21. The pre-solution obtained after pre-dissolution enters the stirring kettle 30, and then the second batch of solvents and additives are added to the stirring kettle 30 in sequence. After dissolving and mixing with the pre-solution, the preparation of the electrolyte is completed. When the feeding part 10 feeds lithium salt into the pre-dissolution kettle 21, the first circulation pump 23 pre-circulates the solution in the pre-dissolution kettle 21 through the first circulation pipeline 22. In this way, the lithium salt fed by the feeding part 10 is added through the first circulation pipeline 22, and the lithium salt will first be pre-dissolved with the solution in the first circulation pipeline 22. The liquid flowing in the first circulation pipeline 22 dissolves the lithium salt in time, and the heat release is completed in advance. In addition, the solid lithium salt is added to the real-time flowing liquid, which can effectively avoid the phenomenon of uneven dissolution of the solid lithium salt causing high free acid. Then, the solid lithium salt enters the pre-dissolution kettle 21 for secondary dissolution with the solution in the pre-dissolution kettle 21. Compared with the prior art in which the lithium salt is directly fed into the stirring kettle 30, the dissolution efficiency of the lithium salt is improved, the heat release rate is accelerated, and the production efficiency of the electrolyte preparation is correspondingly improved. Moreover, the first circulation pipeline 22 operates continuously, which not only allows the lithium salt to dissolve with the solvent in the first circulation pipeline 22 and release heat before entering the pre-dissolution kettle 21, but also the first circulation pipeline 22 puts the solution in the pre-dissolution kettle 21 in a state of internal circulation and continuous heat exchange, thereby increasing the heat exchange rate between the lithium salt and the solution in the pre-dissolution kettle 21, correspondingly increasing the dissolution rate of the lithium salt, and improving the production efficiency of the electrolyte preparation.

[0098] The first valve 51, the second valve 52, and the third valve 53 are configured such that when lithium salt is added to the feeding section 10, the first valve 51 is closed, and the second valve 52 and the third valve 53 are opened. The first circulation pipeline 22 can draw the solution in the pre-dissolving kettle 21 from the discharge port of the pre-dissolving kettle 21 to the feed port of the pre-dissolving kettle 21, thereby achieving circulation of the solution in the pre-dissolving kettle 21. The lithium salt can be added to the first circulation pipeline 22 and enter the pre-dissolving kettle 21 along with the solution in the first circulation pipeline 22. After the lithium salt is added, the first valve 51 and the third valve 53 are closed, and the second valve 52 is opened, thereby achieving internal circulation of the solution in the pre-dissolving kettle 21 in the first circulation pipeline 22. When the solution in the pre-dissolving kettle 21 needs to be transferred to the stirring kettle 30, the first valve 51 is opened, and the second valve 52 and the third valve 53 are closed. The first circulation pipeline 22 is then connected to the discharge pipeline 24.

[0099] In some embodiments, the discharge port of the feeding section 10 is arranged at a height higher than the feed port of the pre-dissolution vessel 21. A concentration measuring component 40 is provided in the pre-dissolution vessel 21 for monitoring the concentration of the pre-solution in the pre-dissolution vessel 21. A temperature sensor 41 is provided on the first circulation pipeline 22 for monitoring the temperature of the liquid in the first circulation pipeline 22. The lithium salt mixing device further includes a controller 42, to which the concentration measuring component 40, the temperature sensor 41, the first cooling water pipeline assembly 211, the first circulation pump 23, and the first valve assembly 50 are all electrically connected; the controller 42 is configured to control the first circulation pump 23, the first cooling water pipeline assembly 211, and / or the first valve assembly 50 based on the monitoring data from the concentration measuring component 40 and / or the temperature sensor 41.

[0100] The concentration measuring component 40 can monitor the concentration of the pre-solution in the pre-dissolution kettle 21, and then calculate the solid salt content based on the flow rate of the solution, so that the operator can take the next step in a timely manner based on the concentration of the pre-solution. The temperature sensor 41 monitors the temperature of the liquid in the first circulation pipeline 22, making it convenient to control the circulation speed of the first circulation pipeline 22 or the speed of adding salt according to the temperature of the liquid, thereby controlling the temperature of the pre-solution within a suitable range. There is no need for manual sampling to measure the temperature of the liquid in the first circulation pipeline 22, and it is easy to achieve automated control. The controller 42 can automatically control the first circulation pump 23, the first cooling water pipeline assembly 211 and / or the first valve assembly 50 in real time based on the data monitored by the concentration measuring component 40 and the temperature sensor 41, thereby achieving automated control of the pre-dissolution kettle assembly 20.

[0101] In some embodiments, the pre-dissolution vessel 21 includes a first wall and a second wall, defining a first heat dissipation cavity between the first wall and the second wall, and the first heat dissipation cavity is provided with a first cooling water pipeline assembly 211. The stirring vessel 30 includes a third wall and a fourth wall, defining a second heat dissipation cavity between the third wall and the fourth wall, and the second cooling water pipeline assembly 31 is provided in the second heat dissipation cavity. The lithium salt mixing device also includes a finished product tank 60, the feed port of the finished product tank 60 is connected to the discharge port of the stirring vessel 30; a second circulation pipeline 32 and a second circulation pump 34 provided on the second circulation pipeline 32 are provided on the outside of the stirring vessel 30, and the two ends of the second circulation pipeline 32 are respectively connected to the top and bottom sides of the stirring vessel 30; the feed port of the finished product tank 60 can be selectively connected to or disconnected from the second circulation pipeline 32 via a fourth valve 54.

[0102] The heat within the pre-dissolution vessel 21 is transferred through the inner wall of the pre-dissolution vessel 21 to the first cooling water pipeline assembly 211 for heat exchange with the cooling water therein. This accelerates the heat dissipation of the solution within the pre-dissolution vessel 21, improves the heat dissipation efficiency of the pre-dissolution vessel 21, and ensures the production stability of the pre-dissolution vessel 21. The heat within the stirring vessel 30 is transferred through the inner wall of the stirring vessel 30 to the cooling water within the second cooling water pipeline assembly 31, accelerating the heat dissipation of the solution within the stirring vessel 30, improving the heat dissipation efficiency of the stirring vessel 30, and ensuring the production stability of the stirring vessel 30. After the pre-solution transferred from the pre-solution vessel 21 enters the stirring vessel 30, the remaining solvent used in the electrolyte preparation is continuously added to the stirring vessel 30 for secondary dissolution and mixing with the pre-solution to produce the electrolyte. By providing a second circulation line 32 and a second circulation pump 34 within the stirred tank 30, the pre-solution generates a significant amount of heat during dissolution with the remaining solvent within the stirred tank 30. The second circulation line 32 circulates the solution within the stirred tank 30, accelerating the dissolution rate and heat dissipation of the solution within the stirred tank 30. After the electrolyte is prepared, the fourth valve 54 is opened to transfer the prepared electrolyte within the stirred tank 30 to the finished product tank 60, which serves as a temporary storage for the electrolyte.

[0103] In some embodiments, a first stirring component 33 is provided in the stirring tank 30, and the first stirring component 33 is used to stir the solution in the stirring tank 30; a second stirring component 28 is provided in the pre-dissolution tank 21, and the second stirring component 28 is used to pre-stir and dissolve the lithium salt added from the feeding part 10 and the solvent in the pre-dissolution tank 21. By providing the first stirring component 33 in the stirring tank 30, the first stirring component 33 can stir the solution in the stirring tank 30, accelerate the mixing speed of the solution, shorten the mixing time, and improve production efficiency. Similarly, by providing the second stirring component 28 in the pre-dissolution tank 21, the second stirring component 28 can pre-stir and dissolve the lithium salt added from the feeding part 10 and the solvent in the pre-dissolution tank 21, accelerate the mixing speed, shorten the mixing time, and improve production efficiency.

[0104] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A lithium salt mixing device, characterized in that: include: Feeding section, used for feeding lithium salt; stirred tank; Wherein, a pre-dissolution kettle assembly is provided between the feeding part and the stirring kettle, and the pre-dissolution kettle assembly includes a pre-dissolution kettle and a first circulation pipeline, the inlet end of the first circulation pipeline is connected to the discharge port of the pre-dissolution kettle, and the outlet end of the first circulation pipeline is connected to the feed port of the pre-dissolution kettle. The feeding part and the stirring kettle can be selectively connected or disconnected with the first circulation pipeline through a first valve assembly, and the pre-dissolution kettle is used to pre-mix and dissolve the lithium salt fed into the feeding part with the solvent in the pre-dissolution kettle.

2. The lithium salt mixing device according to claim 1, characterized in that The first circulation pipeline is provided with a first circulation pump, and the first circulation pump is used to provide power to flow the fluid in the first circulation pipeline from the inlet end to the outlet end.

3. The lithium salt mixing device according to claim 2, characterized in that The first valve assembly includes a first valve, a second valve, and a third valve. The stirred tank is connected to the first circulation pipeline via a discharge pipeline. The first valve is arranged on the discharge pipeline. The second valve is provided on the first circulation pipeline and is located between the discharge pipeline and the outlet end of the first circulation pipeline; The third valve is provided on the feeding pipeline of the feeding part, the feeding pipeline is communicated with the first circulation pipeline, and is located between the second valve on the first circulation pipeline and the outlet end of the first circulation pipeline.

4. The lithium salt mixing device according to claim 3, characterized in that The height of the feeding part is higher than the feeding port of the pre-dissolution kettle.

5. The lithium salt mixing device according to claim 3, characterized in that: A concentration measuring component is provided in the pre-dissolution kettle, and the concentration measuring component is used to monitor the concentration of the pre-solution in the pre-dissolution kettle.

6. The lithium salt mixing device according to claim 5, characterized in that A temperature sensor is provided on the first circulation pipeline, and the temperature sensor is used to monitor the temperature of the liquid in the first circulation pipeline.

7. The lithium salt mixing device according to claim 6, characterized in that: The pre-dissolution kettle comprises a first wall and a second wall, wherein a first heat dissipation cavity is defined between the first wall and the second wall, and a first cooling water pipeline assembly is provided in the first heat dissipation cavity.

8. The lithium salt mixing device according to claim 7, characterized in that The lithium salt mixing device also includes: The concentration measuring component, the temperature sensor, the first cooling water pipeline assembly, the first circulation pump and the first valve assembly are all electrically connected to the controller; the controller is used to control the first circulation pump, the first cooling water pipeline assembly and / or the first valve assembly according to the monitoring data of the concentration measuring component and / or the temperature sensor.

9. The lithium salt mixing device according to claim 3, characterized in that: A filter assembly and a magnetic rod are provided between the inlet end of the first circulation pipeline and the discharge pipeline.

10. The lithium salt mixing device according to claim 3, characterized in that: A flow meter is provided on the discharge pipeline.

11. The lithium salt mixing device according to claim 1, characterized in that: The lithium salt mixing device also includes: a finished product tank, wherein the feed port of the finished product tank is connected to the discharge port of the stirring tank; The stirring tank is provided with a second circulation pipeline and a second circulation pump arranged on the second circulation pipeline. The two ends of the second circulation pipeline are respectively connected to the top and bottom sides of the stirring tank; the feed port of the finished product tank can be selectively connected or disconnected with the second circulation pipeline through a fourth valve.

12. The lithium salt mixing device according to claim 1, characterized in that The stirring kettle includes a third wall and a fourth wall. A second heat dissipation cavity is defined between the third wall and the fourth wall. A second cooling water pipeline assembly is provided in the second heat dissipation cavity.

13. The lithium salt mixing device according to claim 1, characterized in that: A first stirring component is provided in the stirring tank, and the first stirring component is used to stir the solution in the stirring tank; A second stirring component is provided in the pre-dissolution kettle, and the second stirring component is used to stir the solution in the pre-dissolution kettle.

14. A battery production line, characterized in that: The invention comprises a lithium salt mixing device according to any one of claims 1 to 13.

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