Liquid storage tank

Abstract

The utility model provides a liquid storage tank which comprises a tank body and a sound wave device, the tank body is provided with a containing cavity used for containing electrolyte, the sound wave device comprises a sound wave rod, and the sound wave rod extends into the containing cavity and is inserted into the electrolyte to remove gas in the electrolyte. Wherein the sound wave rod extends in the height direction of the containing cavity, and the ratio of the size of the sound wave rod in the extending direction to the height of the tank body ranges from 3 / 5 to 4 / 5. Compared with the traditional negative pressure degassing or stirring degassing method, the liquid storage tank provided by the utility model has the advantages that the efficiency of removing the gas in the electrolyte by using sound waves is higher, and the bubble vibration at each depth level in the electrolyte can be uniformly excited by setting the size of the sound wave rod in the extension direction within the range, so that the gas in the electrolyte can be effectively removed. And therefore, the overall gas removal effect of the electrolyte is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial machinery technical field, concretely relates to a liquid storage tank. BACKGROUND

[0002] Before the electrolyte is injected into the battery cell, the gas in the electrolyte usually needs to be removed first. The commonly used gas removal methods at present are negative pressure bubble removal and stirring bubble removal. Although the above two gas removal methods can remove the gas in the electrolyte to a certain extent, both have the problems of long time consumption and low gas removal efficiency. SUMMARY

[0003] The embodiment of the utility model provides a kind of liquid storage tank, to solve the problem of low gas removal efficiency in relevant technology.

[0004] In the first aspect, the embodiment of the utility model provides a kind of liquid storage tank, it includes: tank body, is equipped with accommodating cavity to be suitable for accommodating electrolyte;And acoustic wave device, including acoustic wave stick, acoustic wave stick extends into accommodating cavity, and it is suitable for inserting electrolyte to remove the gas in electrolyte;Wherein, acoustic wave stick extends along the height direction of accommodating cavity, the size of acoustic wave stick in extension direction and the ratio of tank body height is 3 / 5 to 4 / 5.

[0005] In an embodiment, the acoustic wave device further includes a main body mounted to the top of the tank body, wherein one end of the acoustic wave stick is connected to the main body, and the other end of the acoustic wave stick extends into the accommodating cavity, and the main body is used to drive the acoustic wave stick to emit sound waves to remove the gas in the electrolyte.

[0006] In an embodiment, the acoustic wave frequency of the acoustic wave device is 20KHz to 30KHz.

[0007] In an embodiment, the tank body is provided with a first liquid outlet, and the first liquid outlet is located at the top of the tank body.

[0008] In an embodiment, the liquid storage tank further includes a liquid outlet pipe, one end of the liquid outlet pipe is connected to the first liquid outlet, and the other end of the liquid outlet pipe extends into the accommodating cavity;Wherein, the other end of the liquid outlet pipe is 20mm to 30mm away from the bottom of the tank body.

[0009] In an embodiment, the diameter of the liquid outlet pipe is 10mm to 16mm.

[0010] In an embodiment, the top of the tank body is provided with a negative pressure port for connecting with a vacuum pumping device to adjust the inside of the tank body to a negative pressure environment, and the vacuum degree of the negative pressure environment is-80KPa to-95KPa.

[0011] In an embodiment, the tank body is provided with a first liquid outlet and a second liquid outlet, and the second liquid outlet is arranged at the bottom of the tank body.

[0012] In an embodiment, the second liquid outlet has a diameter greater than a diameter of the first liquid outlet.

[0013] In an embodiment, a ratio of the diameter of the second liquid outlet to the diameter of the first liquid outlet is 1.875 to 5.

[0014] The utility model provides a kind of liquid storage tank, the liquid storage tank includes tank body and acoustic wave device, tank body is equipped with the accommodating cavity for accommodating electrolyte, acoustic wave device includes acoustic wave stick, acoustic wave stick extends into accommodating cavity, and insert electrolyte to remove gas in electrolyte. Among them, acoustic wave stick extends along the height direction of accommodating cavity, and the size of acoustic wave stick in extension direction and the ratio of tank body height is 3 / 5 to 4 / 5.Compared with traditional negative pressure degassing or stirring degassing method, the liquid storage tank provided by the utility model removes gas in electrolyte with higher efficiency using acoustic wave, and by setting the size of acoustic wave stick in extension direction in above-mentioned range, it can uniformly excite bubble vibration of each depth level in electrolyte, to ensure the effect of removing gas of electrolyte as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0016] Figure 1 It is the structure schematic view of the liquid storage tank provided by the utility model embodiment;

[0017] Figure 2 It is the structure schematic view of the liquid storage tank provided by the utility model embodiment from another visual angle;

[0018] Figure 3 It is Figure 1 The structure schematic view of acoustic wave device in it;

[0019] Figure 4 It is Figure 1 The side view of liquid storage tank in it;

[0020] Figure 5 It is Figure 4 The sectional view of liquid storage tank in it;

[0021] Marked with legend:

[0022] 100, liquid storage tank;110, tank body;120, acoustic wave device;121, acoustic wave stick;122, main body;130, first liquid outlet;140, liquid outlet pipe;150, negative pressure port. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower directions of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings. The "inner" and "outer" refer to the outline of the device.

[0024] To solve the problem of low gas removal efficiency in electrolyte in the related art, the embodiment of the present application provides a liquid storage tank 100, please refer to Figure 1 、 Figure 3 、 Figure 5 , Figure 1 is a structural schematic view of the liquid storage tank 100 provided by the embodiment of the present application, Figure 3 is Figure 1 a structural schematic view of the sound wave device 120 in Figure 5 is Figure 1 a sectional view of the liquid storage tank 100 in The liquid storage tank 100 includes a tank body 110 and a sound wave device 120. The tank body 110 is provided with a containing cavity for containing electrolyte. The sound wave device 120 includes a sound wave rod 121, which extends into the containing cavity and is inserted into the electrolyte to remove the gas in the electrolyte. Wherein, the sound wave rod 121 extends along the height direction of the containing cavity, and the ratio between the size of the sound wave rod 121 in the extension direction and the height of the tank body 110 is designed to be 3 / 5 to 4 / 5.

[0025] To improve the gas removal efficiency in electrolyte, the embodiment introduces the sound wave device 120 into the structure of the liquid storage tank 100. Specifically, the sound wave rod 121 inserted into the electrolyte vibrates at high frequency and propagates in the form of sound wave to the electrolyte, thereby exciting the cavitation effect of the bubbles in the electrolyte, so that the bubbles rapidly expand under the action of ultrasonic waves. When the bubbles expand to a certain extent, they will break, and the bubbles will also produce shock waves at the same time. Such shock waves can effectively destroy the micro-bubbles in the electrolyte, thereby achieving the effect of removing the gas in the electrolyte.

[0026] In the structure of the liquid storage tank 100, the sound rod 121 extends along the height direction of the accommodating cavity. In order to ensure the propagation efficiency of the sound wave in the electrolyte, it is necessary to ensure that the sound rod 121 is inserted into the electrolyte deep enough to excite the bubble vibration in the electrolyte in a large range. However, if the insertion depth is too deep, the energy of the sound wave may be concentrated in a deeper area, thereby affecting the degassing efficiency of the upper area of the electrolyte. If the insertion depth is too shallow, the propagation range of the sound wave may be limited, thereby resulting in an unsatisfactory degassing effect. In the embodiment, the ratio of the size of the sound rod 121 in the extension direction to the height of the tank body 110 is designed to be in the range of 3 / 5 to 4 / 5, which can ensure a high degassing efficiency of the electrolyte and also help to uniformly excite the bubble vibration of each depth level in the electrolyte, thereby ensuring the overall gas removal effect of the electrolyte. Compared with the traditional negative pressure degassing or stirring degassing method, the sound wave degassing has a significant advantage in efficiency and can remove the gas in the electrolyte in a relatively short time.

[0027] In some embodiments, referring to Figure 1 , Figure 3 , the sound wave device 120 further includes a main body 122 installed on the top of the tank body 110, wherein one end of the sound rod 121 is connected to the main body 122, and the other end of the sound rod 121 extends into the accommodating cavity. The main body 122 is used to drive the sound rod 121 to emit sound waves to remove the gas in the electrolyte.

[0028] Specifically, the main body 122 is internally provided with an ultrasonic wave generator and a power amplifier device for driving the vibration of the sound rod 121. The ultrasonic wave generator is used to convert the input electrical signal into a high-frequency mechanical vibration, and the power amplifier is used to amplify the vibration signal to a pre-set frequency. Finally, the amplified vibration signal is transmitted to the end of the sound rod 121 close to the electrolyte, so that the sound rod 121 generates mechanical vibration and converts the vibration into sound waves. When these sound waves propagate in the electrolyte, they form a cavitation effect of the gas bubbles. These bubbles are broken by the oscillation effect, thereby achieving the removal of the gas in the electrolyte.

[0029] In order to effectively remove the gas in the electrolyte, in some embodiments, the frequency of the sound wave of the sound wave device 120 is set in the range of 20 KHz to 30 KHz. Specifically, if the frequency of the sound wave is too low, the sound wave can produce strong mechanical vibration, but the effect of removing the gas in the electrolyte is poor. If the frequency of the sound wave is too high, the gas bubbles in the electrolyte may be broken too small, which is not conducive to the removal of the gas bubbles. The frequency range provided in the embodiment has been verified by multiple experiments. In this frequency range, the vibration of the micro-bubbles generated by the cavitation effect of the sound wave can effectively remove the gas in the electrolyte and avoid the negative impact of excessive vibration on the electrolyte.

[0030] In some embodiments, referring to Figure 1 ,Figure 5 The tank body 110 is provided with a first liquid outlet 130 for the electrolyte after the gas is removed, and the first liquid outlet 130 is located at the top of the tank body 110.

[0031] In the process of conveying the electrolyte, the flow rate of the electrolyte is one of the important factors affecting the content of gas bubbles in the electrolyte. When the flow rate of the electrolyte is too fast, it is easy to cause splashing or sputtering phenomenon, which can increase the risk of re-mixing of the electrolyte and gas bubbles, and ultimately affect the purity of the electrolyte. Therefore, in the design of the liquid storage tank structure, in order to avoid the splashing phenomenon caused by the too fast flow rate of the electrolyte, the first liquid outlet 130 is arranged at the top of the tank body 110. This design makes the flow rate of the electrolyte be affected by gravity during the process of flowing through the pipeline or channel in the tank body 110 and flowing out of the first liquid outlet 130, so that the kinetic energy of the electrolyte is reduced to some extent, thereby reducing the splashing problem of the electrolyte during the flowing process, and ultimately reducing the risk of mixing of the electrolyte and gas caused by splashing.

[0032] In some embodiments, referring to Figure 5 The liquid storage tank 100 further comprises a liquid outlet pipe 140, one end of the liquid outlet pipe 140 is connected with the first liquid outlet 130, and the other end of the liquid outlet pipe 140 extends into the accommodating cavity and is inserted into the electrolyte to convey the electrolyte out of the first liquid outlet 130. The distance between the other end of the liquid outlet pipe 140 and the bottom of the tank body 110 is 20-30 mm.

[0033] On the one hand, if the distance d between the other end of the liquid outlet pipe 140 and the bottom of the tank body 110 is too large, when the liquid level of the electrolyte stored in the tank body 110 drops below the height of the other end of the liquid outlet pipe 140, the suction pressure of the liquid outlet pipe 140 is insufficient due to the action of gravity under the condition of a certain height difference, which causes the liquid outlet pipe 140 to be unable to effectively suck out the remaining electrolyte, thereby causing the problem that the residual electrolyte in the tank body 110 cannot be completely discharged. On the other hand, if the distance d between the other end of the liquid outlet pipe 140 and the bottom of the tank body 110 is too small, that is, the gap between the liquid outlet pipe 140 and the bottom of the tank body 110 is too narrow, the discharge efficiency of the electrolyte can also be affected. Specifically, the liquid will encounter a large resistance when being discharged, and the too small distance will cause the electrolyte to be discharged poorly.

[0034] Experiments have proved that in order to effectively avoid the above two problems, the distance d between the liquid outlet pipe 140 and the bottom of the tank body 110 is designed to be within the range of 20-30 mm. When the distance d is set to be between 20-30 mm, the discharge fluency of the electrolyte is optimized, the change of the liquid level height does not have a great impact on the discharge efficiency, and the problem of the electrolyte being unable to be sucked out due to the too large distance d is also avoided.

[0035] In some embodiments, the diameter of the liquid outlet pipe 140 is designed to be 10-16mm.

[0036] Specifically, when the diameter of the liquid outlet pipe 140 is too small, the following defects exist: the flow rate of the electrolyte is limited when passing through the liquid outlet pipe 140 with a small diameter, even if the power of the electrolyte pump is sufficient, the narrow pipe will still affect the flow of the electrolyte, resulting in poor discharge of the electrolyte. While the diameter of the liquid outlet pipe 140 is too large, although it can provide a larger flow rate of the electrolyte, it also requires more support structure to ensure smooth flow of the electrolyte, which may increase the complexity of design and installation.

[0037] In the present embodiment, the diameter of the liquid outlet pipe 140 is designed to be 10-16mm, and experiments have proved that the liquid outlet pipe 140 can provide sufficient flow to ensure normal discharge of the electrolyte. On the one hand, the liquid outlet pipe 140 within this diameter range provides a good balance, avoiding excessive flow resistance and unnecessary energy waste due to excessive diameter. On the other hand, the relatively large pipe diameter can effectively reduce the possibility of blockage, and the liquid outlet pipe 140 within this diameter range is large enough for most electrolyte systems to ensure smooth flow, and compared with the liquid outlet pipe 140 with a larger diameter, the liquid outlet pipe 140 provided in the present embodiment costs less and is easier to install and maintain.

[0038] In the present embodiment, the diameter of the liquid outlet pipe 140 is designed to be 10-16mm, which can effectively avoid the problems of insufficient flow and excessive resistance caused by too small diameter, and also avoid the problems of cost waste and unstable flow rate caused by too large diameter. The pipe diameter within this range can balance the flow efficiency, cost benefit and equipment load of the system, and ensure smooth discharge of the electrolyte.

[0039] In some embodiments, the top of the tank body 110 is provided with a negative pressure port 150 connected with a vacuum pumping device, so as to adjust the inside of the tank body 110 to a negative pressure state, and the vacuum degree of the negative pressure environment is set to be-80KPa to-95KPa. Specifically, the top of the tank body 110 in the present embodiment is provided with a negative pressure port 150 connected with a vacuum pumping device, and the vacuum pumping device can effectively extract the gas in the inside of the tank body 110 through the negative pressure port 150, so as to form a negative pressure environment in the inside of the tank body 110. Under the negative pressure environment, the solubility of the gas is low, so as to accelerate the escape speed of the gas from the electrolyte. In addition, the negative pressure environment can effectively reduce the adhesion of the bubbles in the electrolyte, so that the bubbles in the electrolyte are more easily detached, thereby improving the efficiency of removing the dissolved gas in the electrolyte.

[0040] The step of removing gas in the electrolyte by the liquid storage tank 100 in the embodiment includes the following stages:

[0041] 1. The electrolyte is delivered into the tank body 110 through the liquid inlet until the electrolyte level rises to a preset height;

[0042] 2. The negative pressure port 150 at the top of the tank body 110 is opened, and the gas in the tank body 110 is extracted by the vacuum extraction device connected thereto. In this process, the vacuum extraction device will reduce the pressure in the tank body 110 to form a negative pressure environment. The vacuum degree of the negative pressure environment is set to between-80KPa and-90KPa to ensure that the negative pressure environment can effectively promote the escape of gas in the electrolyte;

[0043] 3. Under the negative pressure environment, the ultrasonic device 120 is started to operate at a preset frequency and power for a certain time. The ultrasonic device 120 generates cavitation effect in the electrolyte through high-frequency vibration, which makes the bubbles in the electrolyte constantly generate and break, thereby accelerating the release of gas. Under the condition of negative pressure, the ultrasonic cavitation effect is more significant, which can more effectively remove the gas in the electrolyte;

[0044] 4. After the preset time of ultrasonic treatment is completed, the negative pressure port 150 and the ultrasonic device 120 are closed;

[0045] 5. The first liquid outlet 130 is opened, and the electrolyte after the gas is removed is discharged from the liquid storage tank 100 by controlling the electrolyte pump.

[0046] In the embodiment, by combining the negative pressure environment with the ultrasonic device 120, the accelerating effect of negative pressure on gas desorption is fully utilized, and the cavitation effect generated by ultrasonic waves further promotes the escape of gas in the electrolyte. The combination of the two can significantly improve the efficiency of gas removal in the electrolyte.

[0047] In some embodiments, the tank body 110 is provided with a first liquid outlet 130 and a second liquid outlet (not shown in the figure), and the second liquid outlet is arranged at the bottom of the tank body 110. The second liquid outlet in the embodiment is used for emergency discharge of the electrolyte in the tank body 110.

[0048] In this embodiment, the tank body 110 designs the first liquid outlet 130 and the second liquid outlet to cope with different working conditions requirements, to ensure the smooth discharge of electrolyte and the safety of tank body 110 operation. Specifically, after the degassing process is completed, the first liquid outlet 130 is usually used for normal electrolyte discharge. Unlike the conventional discharge function of the first liquid outlet 130, the main role of the second liquid outlet is to quickly discharge the electrolyte in the tank body 110 in the event of an emergency, that is, in the event of equipment failure, abnormal liquid level or other emergency situations, by opening the second liquid outlet, so as to effectively reduce the risk of excessive pressure, liquid overflow or other potential hazards in the tank body 110.

[0049] In order to ensure the discharge efficiency of electrolyte in the tank body 110 in an emergency, in some embodiments, the diameter of the second liquid outlet is greater than the diameter of the first liquid outlet 130.

[0050] In a normal operating state, the first liquid outlet 130 is used for conventional discharge of electrolyte, and usually when the liquid level reaches a certain height, the electrolyte is stably discharged through the first liquid outlet 130. The discharge speed of the electrolyte is usually adjusted by the process requirement and the liquid level control system, so that its discharge flow is relatively small, aiming to keep the liquid level within a stable range.

[0051] However, in an emergency, the electrolyte in the tank body 110 may need to be quickly discharged due to system failure, excessive liquid level or abnormal pressure, etc. If the discharge is not timely, it may cause excessive pressure in the tank body 110, and even cause equipment damage or liquid overflow, thereby causing safety hazards. Therefore, the diameter of the second liquid outlet is designed to be greater than that of the first liquid outlet 130, which aims to provide greater liquid discharge flow in an emergency, so as to quickly discharge excess electrolyte from the tank body 110, and ensure that the system can return to a safe state.

[0052] This embodiment can ensure that the electrolyte in the tank body 110 is quickly and stably discharged in an emergency by designing the diameter of the second liquid outlet to be greater than that of the first liquid outlet 130, thereby avoiding equipment damage or safety accidents caused by liquid accumulation or excessive pressure.

[0053] Further, in some embodiments, the diameter of the second liquid outlet is designed to have a ratio of 1.875 to 5 with the diameter of the first liquid outlet 130. Specifically, the main purpose of designing the second liquid outlet is to quickly discharge the electrolyte in an emergency. Experiments have shown that when the ratio is less than 1.875, the discharge capacity of the second liquid outlet may be insufficient to effectively discharge a large amount of electrolyte, which may cause the liquid level to be too high or the pressure to be too large in an emergency, and the system cannot reduce the pressure in time, thereby causing equipment failure or damage. When the ratio is less than 5, the emergency liquid discharge system may become difficult to control, and the too large diameter of the second liquid outlet may cause too rapid changes in liquid flow, thereby causing unnecessary discharge of the electrolyte.

[0054] The utility model provides a kind of liquid storage tank 100, its main purpose is to remove gas in electrolyte by acoustic wave technology.Liquid storage tank 100 includes tank body 110 and acoustic wave device 120, tank body 110 is responsible for containing electrolyte, and acoustic wave device 120 is inserted into electrolyte and vibrates at set frequency to remove gas in electrolyte.Acoustic wave device 120 includes acoustic wave stick 121, and acoustic wave stick 121 passes through its vibration to transmit acoustic wave into electrolyte, excite bubble vibration, to promote bubble breakage and release gas.In order to improve the efficiency of degassing, the ratio of the size of acoustic wave stick 121 and the height of tank body should be controlled between 3 / 5 to 4 / 5, so as to be able to ensure that acoustic wave energy is uniformly distributed at different depth levels of liquid, to achieve more efficient gas removal effect.Compared with traditional negative pressure or stirring degassing method, the liquid storage tank 100 provided by the utility model removes gas in electrolyte with higher efficiency using acoustic wave, and by setting the size of acoustic wave stick 121 in extension direction in the above range, it can uniformly excite bubble vibration at each depth level in electrolyte, to ensure the overall gas removal effect of electrolyte.

[0055] The above embodiments of the utility model are described in detail, and the principles and implementation modes of the utility model are described by applying specific examples; the above embodiment descriptions are only used to help understand the method and core idea of the utility model; meanwhile, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed, and the above description should not be understood as limiting the utility model.

Claims

1. A liquid storage tank, characterized in that: include: A tank body having a receiving cavity suitable for receiving the electrolyte; as well as an acoustic wave device, comprising an acoustic wave rod, the acoustic wave rod extending into the accommodating cavity and adapted to be inserted into the electrolyte to remove gas from the electrolyte; The sonic rod extends along the height direction of the accommodating cavity, and the ratio of the size of the sonic rod in the extension direction to the height of the tank body is 3 / 5 to 4 / 5.

2. The liquid storage tank according to claim 1, characterized in that: The acoustic wave device also includes a main body installed on the top of the tank body, wherein one end of the acoustic wave rod is connected to the main body, and the other end of the acoustic wave rod extends into the accommodating cavity, and the main body is used to drive the acoustic wave rod to emit acoustic waves to remove gas from the electrolyte.

3. The liquid storage tank according to claim 1, characterized in that: The sound wave frequency of the sound wave device is 20KHz to 30KHz.

4. The liquid storage tank according to any one of claims 1 to 3, characterized in that: The tank body is provided with a first liquid outlet, and the first liquid outlet is located at the top of the tank body.

5. The liquid storage tank according to claim 4, characterized in that: The liquid storage tank also includes a liquid outlet pipe, one end of which is connected to the first liquid outlet, and the other end of which extends into the accommodating cavity; wherein the other end of the liquid outlet pipe is 20 mm to 30 mm away from the bottom of the tank body.

6. The liquid storage tank according to claim 5, characterized in that: The diameter of the liquid outlet pipe is 10 mm to 16 mm.

7. The liquid storage tank according to any one of claims 1 to 3, characterized in that: A negative pressure port is provided on the top of the tank body for connecting to a vacuum pumping device to adjust the interior of the tank body to a negative pressure environment, wherein the vacuum degree of the negative pressure environment is -80KPa to -95KPa.

8. The liquid storage tank according to any one of claims 1 to 3, characterized in that: The tank body is provided with a first liquid outlet and a second liquid outlet, and the second liquid outlet is provided at the bottom of the tank body.

9. The liquid storage tank according to claim 8, characterized in that: A diameter of the second liquid outlet is greater than a diameter of the first liquid outlet.

10. The liquid storage tank according to claim 9, characterized in that: The ratio of the diameter of the second liquid outlet to the diameter of the first liquid outlet is 1.875 to 5.

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