Constant-temperature liquid outlet and storage device for lithium battery electrolyte

Abstract

The utility model provides a kind of constant-temperature liquid outlet and storage device of lithium battery electrolyte, it is related to battery manufacturing technical field, and it includes: electrolyte import pipe of electrolyte thermostat device is connected electrolyte room, and electrolyte import pipe is communicated with electrolyte outlet pipe of electrolyte thermostat device by heat exchange pipeline of oil liquid heat exchange box in electrolyte thermostat device;Electrolyte storage device includes: the electrolyte import of bubble-removing tank is connected electrolyte outlet pipe of electrolyte thermostat device;The electrolyte import of buffer tank and the electrolyte outlet of bubble-removing tank are communicated, and the liquid outlet of buffer tank is connected with the liquid injection pump of liquid injection machine.Affirmative effect is to eliminate the temperature difference caused by storage low temperature and environmental temperature rise by physical heat exchange structure forcedly adjusting electrolyte temperature;Bubble separation is realized by bubble-removing tank, the interference of bubble to liquid injection density is reduced, the problem of bubble leading to liquid injection pump cavitation and density error is solved, and then storage is carried out in buffer tank.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a constant temperature dispensing and storage device for lithium battery electrolyte. Background Technology

[0002] In the field of lithium-ion battery cell manufacturing, with the continuous increase in battery electrolyte filling volume, the accuracy control of electrolyte metering during the production process has become a core indicator of equipment performance. As a key control parameter for filling accuracy, the stability of electrolyte density directly affects the metering accuracy of the filling equipment. Analysis shows that the main variables affecting electrolyte density include two aspects: temperature fluctuations during electrolyte transportation and the content of air bubbles mixed in the electrolyte.

[0003] Regarding the impact of temperature, existing processes suffer from the following technical challenges: During storage, the electrolyte is typically kept at low temperatures. As it is transported to the injection workshop via pipelines, significant temperature fluctuations occur due to changes in the ambient temperature gradient (especially during winter when temperature differences are substantial). Based on the thermal expansion temperature coefficient of the electrolyte (typically approximately 0.1% / ℃), when the injection pump uses an electrolyte with a temperature difference exceeding ±5℃, density variations can lead to a metering deviation of over 0.5% in the actual injection volume. Furthermore, microbubbles generated by mechanical disturbance during electrolyte circulation not only reduce the effective injection density but also cause cavitation in the injection pump, further deteriorating metering accuracy and stability. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a constant-temperature dispensing and storage device for lithium battery electrolyte, comprising:

[0005] An electrolyte temperature control device, wherein the electrolyte inlet pipe of the electrolyte temperature control device is connected to the electrolyte chamber, and the electrolyte inlet pipe is connected to the electrolyte outlet pipe of the electrolyte temperature control device through a heat exchange pipe that passes through the oil heat exchange box in the electrolyte temperature control device;

[0006] Electrolyte storage device, the electrolyte storage device comprising:

[0007] A defoaming tank, wherein the electrolyte inlet of the defoaming tank is connected to the electrolyte outlet pipe of the electrolyte constant temperature device;

[0008] The buffer tank has an electrolyte inlet connected to the electrolyte outlet of the defoaming tank, and the outlet of the buffer tank is connected to the injection pump of the injection machine.

[0009] Preferably, the electrolyte temperature control device further includes:

[0010] A heat transfer oil heating box is provided, wherein a heating wire is provided in the heat transfer oil heating box, and the heat transfer oil heating box and the oil heat exchange box are connected by a circulation pipe, wherein a heat transfer oil pump is provided in the circulation pipe.

[0011] Preferably, the electrolyte constant temperature device includes at least two of the oil heat exchange tanks;

[0012] The electrolyte constant temperature device further includes at least two of the heat transfer oil heating boxes, and the heat exchange pipeline includes at least two heat exchange branch pipes, each of which passes through one of the oil heat exchange boxes.

[0013] Preferably, the heat exchange pipe in the oil heat exchange tank is a continuous S-shaped bend.

[0014] Preferably, the top of the defoaming tank is provided with a defoaming tank vacuum pipe and a defoaming tank atmospheric pipe;

[0015] An atmospheric duct filter is installed on the atmospheric duct of the defoamer tank.

[0016] Preferably, the pipeline between the electrolyte inlet of the defoaming tank and the electrolyte outlet of the electrolyte constant temperature device is equipped with an incoming demagnetizer, an incoming filter, and an incoming differential pressure transmitter. The incoming demagnetizer is equipped with a demagnetizer exhaust port, and the incoming filter is equipped with a filter exhaust port.

[0017] Preferably, the electrolyte storage device further includes a DMC buffer tank. The top of the DMC buffer tank is provided with a nitrogen pipeline and an atmospheric pipeline. The bottom of the DMC buffer tank is connected to a DMC inlet pipe and a DMC outlet pipe, respectively. A pipeline filter is provided on the DMC inlet pipe. The DMC outlet pipe is connected to the electrolyte inlet of the defoaming tank.

[0018] Preferably, the electrolyte storage device further includes a device cover, the bottom of which is provided with a liquid receiving tray, the inner wall of which is provided with an electrolyte concentration detector, and the outer wall of which is provided with a harmful gas detector.

[0019] Preferably, it also includes an exhaust device, comprising:

[0020] A ventilation duct extends into the outer casing of the device, and the ventilation duct is provided with multiple ventilation ports.

[0021] Preferably, the electrolyte storage device further includes a waste liquid tank. The top of the waste liquid tank is provided with a nitrogen pipe, an atmospheric pipe, and a vacuum pipe. The bottom of the waste liquid tank is connected to a waste liquid inlet pipe and a waste liquid outlet pipe. The waste liquid inlet pipe is also provided with a waste liquid inlet branch pipe, which extends into the receiving tray.

[0022] The above technical solution has the following advantages or beneficial effects:

[0023] 1. The electrolyte enters the oil heat exchange tank from the electrolyte room through the electrolyte inlet pipe. It exchanges heat with the external medium (heat transfer oil by default) in the heat exchange pipe that runs through the heat exchange tank. The electrolyte temperature is forcibly regulated through the physical heat exchange structure to eliminate the temperature difference caused by the low temperature of storage and the rise in ambient temperature.

[0024] 2. The electrolyte enters the defoaming tank directly from the outlet of the constant temperature component. The defoaming tank separates the bubbles, reducing their interference with the injection density and solving the problems of cavitation and density error caused by bubbles in the injection pump. Then, it enters the buffer tank for storage. The buffer tank acts as a secondary buffer container to further stabilize the electrolyte pressure and flow rate, preventing the injection pump from drawing out bubbles due to negative pressure caused by flow fluctuations. Attached Figure Description

[0025] Figure 1 A schematic diagram of a constant-temperature dispensing and storage device for lithium battery electrolyte is shown in a preferred embodiment of this utility model.

[0026] Figure 2-3 This is a schematic diagram of the electrolyte constant temperature device in a preferred embodiment of the present invention.

[0027] Figure 4-5 This is a schematic diagram of the structure of the bubble tank in a preferred embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the buffer tank in a preferred embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the structure of the DMC buffer tank is shown in a preferred embodiment of this utility model.

[0030] Figure 8 This is a schematic diagram of the structure of the waste liquid tank in a preferred embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the device housing in a preferred embodiment of the present invention. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within its scope.

[0033] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, a constant-temperature dispensing and storage device for lithium battery electrolyte is provided, such as... Figure 1-9 As shown, it includes:

[0034] Electrolyte constant temperature device 1, the electrolyte inlet pipe 11 of the electrolyte constant temperature device is connected to the electrolyte chamber, and the electrolyte inlet pipe 11 is connected to the electrolyte outlet pipe 14 of the electrolyte constant temperature device through the heat exchange pipe 13 that passes through the oil heat exchange box 12 in the electrolyte constant temperature device.

[0035] Electrolyte storage device 2, the electrolyte storage device 2 includes:

[0036] Bubble separator 21, the electrolyte inlet of bubble separator 21 is connected to the electrolyte outlet pipe 14 of electrolyte constant temperature device;

[0037] The buffer tank 22 has an electrolyte inlet connected to the electrolyte outlet of the defoaming tank 21, and the outlet of the buffer tank 22 is connected to the injection pump of the injection machine.

[0038] Specifically, in this embodiment, as Figure 1 As shown, the device includes two components: an electrolyte temperature control device 1 and an electrolyte storage device 2. The electrolyte enters the oil heat exchange tank 12 from the electrolyte chamber through the electrolyte inlet pipe 11. It exchanges heat with the external medium (default heat transfer oil) in the heat exchange pipe 13 that runs through the heat exchange tank. The electrolyte temperature is forcibly regulated through the physical heat exchange structure, eliminating the temperature difference caused by the low storage temperature and the rise in ambient temperature.

[0039] The electrolyte enters the defoaming tank directly from the outlet of the constant temperature component. The defoaming tank 21 separates the bubbles, reducing the interference of bubbles on the injection density and solving the problems of cavitation and density error caused by bubbles in the injection pump. Then it enters the buffer tank 22 for storage. The buffer tank 22 acts as a secondary buffer container to further stabilize the electrolyte pressure and flow rate, and prevent the injection pump from drawing out bubbles due to negative pressure caused by flow fluctuations.

[0040] Among them, the electrolyte constant temperature device 1 is mainly used to heat the electrolyte that is transported from the electrolyte room through pipeline in the electrolyte injection workshop to ensure that the temperature range of the electrolyte supplied to the electrolyte storage system remains unchanged.

[0041] The heat exchange pipe 13 in the electrolyte constant temperature device is connected to the electrolyte room through the electrolyte inlet pipe 11. It is used to receive electrolyte into the oil heat exchange tank 12 for heating. An inlet flow meter S is installed on the electrolyte inlet pipe 11, which is mainly used to collect and record the flow data of the incoming electrolyte and to count the amount of electrolyte used in each production shift. An inlet thermometer T is also installed on the electrolyte inlet pipe 11, which is mainly used to collect the temperature at the time of inlet and compare it with the temperature of the electrolyte coming out of the electrolyte constant temperature system to count the heating effect of the electrolyte constant temperature system and guide whether the heating power of the heat transfer oil heating tank in the electrolyte constant temperature device needs to be increased.

[0042] In a preferred embodiment of this utility model, such as Figure 1-3 As shown, the electrolyte temperature control device 1 also includes:

[0043] The heat transfer oil heating box 15 is equipped with a heating wire 16. The heat transfer oil heating box 15 and the oil heat exchange box 12 are connected by a circulation pipe 17, and a heat transfer oil pump P is installed in the circulation pipe 17.

[0044] In a preferred embodiment of the present invention, the electrolyte constant temperature device 1 includes at least two oil heat exchange boxes 12;

[0045] The electrolyte constant temperature device 1 also includes at least two heat transfer oil heating boxes 15, and the heat exchange pipe 13 includes at least two heat exchange branch pipes 131, each heat exchange branch pipe 131 passing through an oil heat exchange box 12.

[0046] Specifically, in this embodiment, there are two heat transfer oil heating boxes 15 and two oil heat exchange boxes 12 (more than two can be set in other embodiments). Correspondingly, there are two heat exchange branch pipes 131, and the circulation pipe 17 also includes two circulation branch pipes 171.

[0047] Preferably, in this embodiment, the heat exchange pipe 13 is a continuous S-shaped bend in the oil heat exchange box 12.

[0048] Specifically, during the electrolyte transport process, the continuous S-shaped bend heat exchange pipe 13 / heat exchange branch pipe 131 can maximize the heating area for the heat transfer oil, ensuring the heating effect of the electrolyte.

[0049] The electrolyte constant temperature device 1 mainly uses heated heat transfer oil to heat the electrolyte in the heat exchange branch pipe. A thermometer T is installed on each heat exchange branch pipe 131 and circulation branch pipe 171. The thermometer T can record and count the electrolyte temperature coming out of the electrolyte constant temperature system in real time.

[0050] A heat transfer oil pump P is installed on the circulation pipeline 13. Its main purpose is to pump the heat transfer oil flowing out of the heat transfer oil heating tank 15 into the oil heat exchange tank 12, so that the heat transfer oil circulates between the heat transfer oil heating tank 15 and the oil heat exchange tank 12. A pressure gauge M is installed at the outlet of the heat transfer oil pump P to monitor the pump's outlet pressure. A pressure gauge M is also installed on the circulation pipeline 13 to monitor the pressure in the pipeline. When the pressure is too high, the power of the heat transfer oil pump P is reduced; when the pressure is too low, the power of the heat transfer oil pump P is increased.

[0051] A valve K is provided on each circulation branch pipe 131 to control the opening and closing of the circulation branch pipe 131.

[0052] The heat transfer oil heating box 15 includes a heating wire 16. The heat transfer oil heating box 15 mainly contains heat transfer oil pumped out by the heat transfer oil pump P. When the electrolyte flows through the heating wire 16, the electrolyte temperature is heated. Then the heated heat transfer oil flows into the oil heat exchange box 12 to exchange heat with the electrolyte in the heat exchange pipe 13.

[0053] The thermometer T at the outlet of the heat transfer oil heating box 15 is mainly used to detect the temperature of the heat transfer oil after the heat transfer oil heating box 15. When the temperature of the heat transfer oil is too low, the power of the heating wire 16 needs to be increased to raise its temperature; when the temperature of the heat transfer oil is too high, the power of the heating wire 16 needs to be decreased to lower its temperature; ultimately ensuring that the temperature of the heat transfer oil exiting the heat transfer oil heating box is maintained within a certain range.

[0054] Each oil heat exchanger 12 is provided with a heat transfer oil exhaust port 121 at the bottom and a heat transfer oil filling port 122 at the top for adding and draining oil from the oil heat exchanger.

[0055] like Figure 4-5 As shown, preferably, the top of the defoaming tank 21 is provided with a defoaming tank vacuum pipe 211 and a defoaming tank atmospheric pipe 212;

[0056] An atmospheric duct filter 213 is installed on the atmospheric duct 212 of the defoamer tank.

[0057] Preferably, the pipeline between the electrolyte inlet of the defoaming tank 21 and the electrolyte outlet of the electrolyte constant temperature device is equipped with an incoming demagnetizer 214, an incoming filter 215 and an incoming differential pressure transmitter 216. The incoming demagnetizer is equipped with a demagnetizer exhaust port and the incoming filter is equipped with a filter exhaust port.

[0058] Specifically, such as Figure 4-5 As shown, the electrolyte storage device 2 in this embodiment includes a defoaming tank 21. The pipeline between the electrolyte inlet of the defoaming tank 21 and the electrolyte outlet pipe 14 of the electrolyte constant temperature device is equipped with an incoming demagnetizer 214, an incoming filter 215 and an incoming differential pressure transmitter 216, which are mainly used to demagnetize and filter the electrolyte that has been heated at a constant temperature.

[0059] Specifically, the incoming material demagnetizer 214 is equipped with a permanent magnet rod, which mainly removes iron filings remaining inside the electrolyte. The magnetic flux can be selected according to actual needs. The incoming material demagnetizer is designed with a quick-release design, which facilitates daily cleaning and installation of the incoming material demagnetizer.

[0060] Specifically, the incoming filter 215 is equipped with a filter element of the corresponding mesh size, which mainly removes the tiny impurities remaining inside the electrolyte. It is also designed with a quick-release mechanism.

[0061] Specifically, the incoming material differential pressure transmitter 216 is installed at both ends of the incoming material demagnetizer 214 and the incoming material filter 215. Its main purpose is to detect the pressure difference between the two ends of the filter and determine whether the filter is blocked, thereby reminding production personnel to clean the incoming material demagnetizer and the incoming material filter in a timely manner.

[0062] Furthermore, the defoaming tank 21 also includes a defoaming tank level detection pipe 217 and level gauges J (upper and lower), a defoaming tank forced exhaust port 218, and other components. The lower part of the defoaming tank has an inlet, an outlet, and a level detection pipe interface, while the upper part of the tank is connected to the defoaming tank vacuum pipe 211 and the defoaming tank atmospheric pipe 212. The upper and lower parts of the tank are connected by screws, and a corrosion-resistant rubber ring is installed between them to ensure a seal.

[0063] The liquid level detection pipe 217 and the liquid level gauge J (upper and lower) are mainly used to control the flow of electrolyte into the defoaming tank and to stop the flow of electrolyte (usually, electrolyte is introduced when the liquid level is too low and stops flowing when the liquid level reaches the set height). At the same time, a forced discharge port 218 is opened at the bottom of the defoaming tank liquid level detection pipe to ensure that electrolyte can be discharged from the defoaming tank assembly under special circumstances.

[0064] Furthermore, the defoaming tank vacuum pipe 211 and the defoaming tank atmospheric pipe 212 are mainly used to use external vacuum to purge the dissolved nitrogen or air in the electrolyte, so as to achieve the effect of no bubbles in the electrolyte and ensure the overall injection accuracy of the injection machine.

[0065] Specifically, the vacuum pipe 211 of the defoaming tank and its corresponding valve K mainly utilize external vacuum to extract dissolved nitrogen and air from the electrolyte; the atmospheric pipe 212 of the defoaming tank and its corresponding valve K are used to open the atmospheric pipe 212 and valve K after the electrolyte in the defoaming tank has been defoamed, ensuring that the defoaming tank can return to normal pressure, so that the defoamed electrolyte can flow smoothly through the outlet of the defoaming tank to the buffer tank 22. The atmospheric pipe filter 213 of the defoaming tank mainly filters impurities in the atmosphere to ensure that the defoamed electrolyte is not contaminated.

[0066] Furthermore, such as Figure 6 As shown, the buffer tank 22 is used to buffer the electrolyte after the air bubbles have been removed, so that it can be used by the injection pump in the injection machine when dispensing the electrolyte.

[0067] Specifically, the buffer tank 22 is equipped with a liquid level detection pipe 221 and a liquid level gauge J (upper and lower), the top of the buffer tank 22 is equipped with a buffer tank atmospheric pipe 222 and its corresponding valve K, an atmospheric pipe filter 223, a buffer tank vacuum pipe 224 and its corresponding valve, the outlet of the buffer tank is equipped with a thermometer T, and the buffer tank outlet pipe 225 and valve K.

[0068] The buffer tank 22 consists of two parts: an upper and a lower part. The lower part of the tank has an electrolyte inlet, an outlet, and a level detection pipe interface, while the upper part has interfaces for the buffer tank vacuum pipe 224 and the buffer tank atmospheric pipe 222. The upper and lower parts of the tank are connected by screws, and a corrosion-resistant rubber ring is installed between them to ensure a tight seal. The buffer tank level detection pipe 226 and the level gauge J (upper and lower) mainly control the start and stop of electrolyte inflow and outflow from the buffer tank 22. Simultaneously, a forced drain port 227 is provided at the bottom of the buffer tank level detection pipe 226 to ensure that electrolyte can be discharged from the buffer tank assembly under special circumstances.

[0069] The vacuum pipe 224 of the buffer tank and its corresponding valve K mainly utilize external vacuum to draw electrolyte from the defoaming tank 21 into the buffer tank 22. When the atmospheric pipe 222 of the buffer tank and its corresponding valve K are opened, the tank of the buffer tank 22 can return to normal pressure, allowing the electrolyte in the buffer tank 22 to flow smoothly through the outlet pipe 225 of the buffer tank and its corresponding valve K to the various injection pumps of the injection machine. The atmospheric pipe filter 223 of the buffer tank mainly filters impurities in the atmosphere to ensure that the electrolyte in the buffer tank 22 is not contaminated. The outlet of the buffer tank is equipped with a thermometer T mainly to detect whether the temperature of the electrolyte is consistent during dispensing. If it is not consistent, it is necessary to control the input rate of the electrolyte into the electrolyte storage device 2.

[0070] In a preferred embodiment of this utility model, such as Figure 7 As shown, the electrolyte storage device 2 also includes a DMC buffer tank 23. The top of the DMC buffer tank is equipped with a buffer tank nitrogen pipe 231 and a buffer tank atmospheric pipe 232. The bottom of the DMC buffer tank is connected to a DMC inlet pipe 233 and a DMC outlet pipe 234, respectively. A pipe filter 235 is provided on the DMC inlet pipe 233. The DMC outlet pipe 234 is connected to the electrolyte inlet of the defoaming tank 21.

[0071] Specifically, the DMC buffer tank mainly buffers DMC (dimethyl carbonate, an organic compound with the chemical formula C3H6O3). The internal uses of DMC in the equipment are as follows: cleaning the defoaming tank, buffer tank, all internal pipelines used to transport electrolyte, injection pump, electrolyte dispensing system, and injection cup; and wetting the wiping mechanism of the injection port to dissolve electrolyte crystals near the battery injection port.

[0072] Furthermore, the DMC buffer tank 23 is connected to the DMC inlet pipe 233, the DMC outlet pipe 234, the detection pipe 216, and the level gauge J (upper and lower). The top of the DMC buffer tank 23 is connected to the atmospheric pipe 232 and its corresponding valve K, the nitrogen pipe 231 and its corresponding valve K, and other components.

[0073] The DMC inlet pipe 233 is equipped with a DMC inlet flow meter S and a pipeline filter 235. The DMC inlet flow meter S is used to detect the DMC flow rate and to count the actual DMC consumption per shift during production. The DMC inlet pipeline filter 235 is used to filter the incoming DMC to prevent jamming or wear of precision mechanisms such as the DMC cleaning injection pump.

[0074] The liquid level detection pipe 236 and liquid level gauge J (upper and lower) of the DMC buffer tank 23 have the same components and working principle as the defoaming tank 21 and buffer tank 22. The atmospheric pipe 232 and its corresponding valve K of the DMC buffer tank are mainly to ensure that the DMC remains at atmospheric pressure after entering the DMC buffer tank 23. The nitrogen pipe 231 and its corresponding valve K of the DMC buffer tank are for facilitating the pumping of DMC from the DMC buffer tank 23 into the corresponding workstations in the injection equipment where DMC is needed. The outlet pipe 234 of the DMC buffer tank and its corresponding valve K have a return pipe 237 and valve K. This return pipe 237 connects the DMC outlet pipe 234 to the electrolyte inlet of the defoaming tank 21, and its function is to deliver the DMC to be used to the valve before the electrolyte inlet of the defoaming tank, so as to facilitate the cleaning of components such as the defoaming tank 21, buffer tank 22, injection pump P, heat exchange pipe 13, and electrolyte dispensing assembly.

[0075] In a preferred embodiment of this utility model, such as Figure 9 As shown, the electrolyte storage device 2 also includes a device cover 24, a liquid receiving tray 241 at the bottom of the device cover, a liquid level sensor 242 in the liquid receiving tray 241, an electrolyte concentration detector 243 on the inner wall of the device cover 241, and a harmful gas detector 244 on the outer wall of the device cover 241.

[0076] Furthermore, the electrolyte storage device includes an outer casing 24, a receiving tray 241, a liquid level sensor 242, an electrolyte concentration detector 243, and a harmful gas concentration detector 244. The outer casing 24 is a stainless steel sheet metal casing, which mainly isolates the internal components to ensure that the electrolyte generated inside does not leak into the electrolyte injection workshop.

[0077] The drip tray 241 and the level sensor 242 are mainly used to collect leaked electrolyte / DMC / waste liquid from various components. At the same time, the level sensor is mainly used to detect whether there is too much liquid in the drip tray so as to prompt the waste liquid tank assembly to collect it in time.

[0078] The electrolyte concentration detector 243 is installed above the receiving tray 241. It mainly detects the air quality inside the outer casing 24 of the device, alerting production personnel whether there is any liquid leakage in the relevant components of the electrolyte storage device 2. It can also indicate whether the exhaust duct needs to be increased in speed.

[0079] The hazardous gas concentration detector 244 is installed on the outside of the device casing 24, which can alert production personnel whether the electrolyte decomposes when exposed to high temperature in the electrolyte storage system.

[0080] In a preferred embodiment of this utility model, such as Figure 9 As shown, it also includes an exhaust device 25, comprising:

[0081] The exhaust duct 251 extends into the outer cover of the device, and the exhaust duct 251 is provided with multiple exhaust ports 252.

[0082] Specifically, an exhaust device 25 is also provided, in which the exhaust channel 251 is mainly used to remove the electrolyte and DMC that may evaporate from the components in the outer casing of the device in a timely manner, so as to ensure the air quality in the outer casing 24 of the storage system. The exhaust channel 251 is divided into multiple branches, and each branch has an exhaust port 251 at the electrolyte / DMC evaporation point.

[0083] In a preferred embodiment of this utility model, such as Figure 8 As shown, the electrolyte storage device 2 also includes a waste liquid tank 26. The top of the waste liquid tank 26 is provided with a waste liquid tank nitrogen pipe 261, a waste liquid pipe atmospheric pipe 262 and a waste liquid tank vacuum pipe 263. The bottom of the waste liquid tank is connected to a waste liquid inlet pipe 265 and a waste liquid outlet pipe 264 respectively. The waste liquid inlet pipe 265 is also provided with a waste liquid inlet branch pipe 266, which extends into the liquid receiving tray 241.

[0084] Specifically, the waste liquid tank 26 includes a waste liquid inlet pipe 265 and its corresponding valve K, a liquid level detection pipe 268 and a liquid level gauge J (upper and lower), a waste liquid tank nitrogen pipe 261 and its corresponding valve K, a waste liquid tank vacuum pipe 263 and its corresponding valve K, a waste liquid tank vent pipe 262 and its corresponding valve K, and a waste liquid tank outlet pipe 264 and its corresponding valve K.

[0085] The waste liquid inlet pipe 265 and its corresponding valve K are mainly connected to the waste liquid trays of various mechanisms inside the injection machine that need to collect waste liquid. When each mechanism's waste liquid tray receives a signal that waste liquid needs to be collected, the waste liquid tank vacuum pipe 263 and its corresponding valve K start working, using vacuum to draw the waste liquid into the waste liquid tank. The waste liquid tank 26, liquid level detection pipe 268, and liquid level gauge J (upper and lower) have the same components and working principle as the defoaming tank 21, buffer tank 22, and DMC buffer tank 23. The waste liquid tank atmospheric vent pipe 262 and its corresponding valve K are mainly to ensure that the waste liquid enters the waste liquid tank 26 and is kept at atmospheric pressure. The waste liquid tank nitrogen pipe 261 and its corresponding valve K are to facilitate the pumping of waste liquid from the waste liquid tank into the pipeline specifically used for collecting waste liquid in the injection workshop, so that the plant can promptly treat the waste liquid generated in the injection workshop.

[0086] The waste liquid inlet pipe 265 is also provided with a waste liquid inlet branch pipe 266, which extends into the liquid receiving tray 241 to draw up the liquid in the liquid receiving tray.

[0087] Specifically, the waste liquid tank 26 mainly collects residual waste liquid inside the storage system receiving tray 241 and waste liquid collected from inside the equipment.

[0088] Furthermore, the valves used in all components of this utility model patent are divided into two categories: manual ball valves and pneumatic valves. The manual ball valves are used in the following locations: heat transfer oil inlet 122, heat transfer oil exhaust port 121, incoming material exhaust port 218, various filter exhaust ports, the exhaust port of the incoming material demagnetizer 214, the exhaust ports at the bottom of various tanks, and the electrolyte outlet pipe; the pneumatic valves are used in the following locations: various liquid inlet / outlet pipes (except electrolyte) and various air inlet / outlet pipes.

[0089] Furthermore, the heat transfer oil used for heating the electrolyte in this invention must meet several requirements, such as corrosion resistance, high temperature resistance, non-ignition, and good thermal conductivity; at the same time, the heating wire in the heat transfer oil heating box is a plate heating wire, which can provide a larger heating area for the heat transfer oil when heating, ensuring its heating efficiency.

[0090] Furthermore, the medium transported in this utility model is electrolyte and DMC, which are corrosive. Therefore, all mechanisms and components must be corrosion resistant. Except for the corresponding testing instruments, other electric components are prohibited from use, and the corresponding testing instruments used must have explosion-proof characteristics.

[0091] Furthermore, each of the four tanks in this invention—the defoaming tank, the buffer tank, the DMC buffer tank, and the waste liquid tank—is equipped with a digital pressure gauge (with explosion-proof and corrosion-resistant properties) to monitor the pressure value in the tank in real time.

[0092] In a preferred embodiment, when the low-temperature electrolyte enters the electrolyte constant temperature device 1 from the electrolyte chamber through the electrolyte inlet pipe 11, the inlet flow meter S and inlet thermometer T in the electrolyte constant temperature device 1 begin to detect the electrolyte flow rate and temperature, respectively. At this time, the inlet pneumatic valve K on the electrolyte inlet pipe 11 of the electrolyte constant temperature device opens, and the electrolyte enters the heat exchange branch pipe 131 and is heated through the oil heat exchange tank 12. After the electrolyte is heated, the thermometer T at the outlet of the heat exchange branch pipe 131 detects the electrolyte temperature and compares it with the injection temperature value required by the injection pump of the injection machine. When the electrolyte temperature is too low, the heating wire power is increased to raise the temperature of the heat transfer oil, thereby increasing the electrolyte heating temperature; conversely, when the electrolyte temperature is too high, the heating wire power is reduced to lower the temperature of the heat transfer oil, thereby reducing the electrolyte heating temperature. After the electrolyte is heated, it enters the electrolyte storage device 2 through the electrolyte outlet pipe 14. It then passes through the incoming demagnetizer 214 and the incoming filter 215 to remove any iron filings and small impurities that may be present in the electrolyte. Simultaneously, the incoming differential pressure transmitter 216 detects the pressure values ​​at both ends of the incoming demagnetizer 214 and the incoming filter 215 to determine if they are blocked and require cleaning or replacement. After demagnetization and filtration, the electrolyte enters the defoaming tank 21. During the filling process, the atmospheric pipe 212 of the defoaming tank and its corresponding valve K are open. The liquid level detection pipe 217 and the liquid level gauge J (upper and lower) of the defoaming tank 21 determine whether electrolyte has been added. If the electrolyte level is not full, the valve at the inlet of the defoamer tank 21 will open to allow continuous electrolyte flow. If the level is full, the valve at the inlet of the defoamer tank 21 will close to stop electrolyte flow. After electrolyte flow stops, the atmospheric pipe 212 and its corresponding valve will open for a period of time and then close. At this time, the vacuum pipe 211 and its corresponding valve will open to evacuate the electrolyte in the defoamer tank 21, removing any nitrogen or air that may be present in the electrolyte. After the defoamer tank 21 has been evacuated for a period of time, the vacuum pipe 211 and its corresponding valve will close, and the atmospheric pipe 212 and its corresponding valve will open to ensure that the internal pressure of the defoamer tank 21 is restored to normal.When the internal pressure of the defoaming tank 21 returns to normal, the electrolyte outlet and its corresponding valve of the defoaming tank open, and the vacuum pipeline 211 of the buffer tank and its corresponding valve open simultaneously. The electrolyte after defoaming enters the buffer tank 22. During the process of adding liquid to the defoaming tank, the liquid level detection pipeline 217 and the liquid level gauge J (upper and lower) of the defoaming tank 21 determine whether the electrolyte in the defoaming tank has been used up. When the electrolyte is used up, the electrolyte outlet and its corresponding valve of the defoaming tank 21 close, and the defoaming tank 21 continues to perform the previous liquid adding and defoaming actions; otherwise, the liquid adding continues. The liquid level detection pipeline 226 and the liquid level gauge J (upper and lower) of the buffer tank 22 can detect the liquid level of the electrolyte in the buffer tank 22 to determine whether the electrolyte is full. When the electrolyte is full, the electrolyte outlet and its corresponding valve of the defoaming tank close. When the corresponding valve is closed, the valves K of the vacuum pipe 224 and the outlet pipe 225 of the buffer tank are closed simultaneously. At this time, the valves K of the atmospheric pipe 222 and the outlet pipe 225 of the buffer tank are opened to ensure that the internal pressure of the buffer tank 22 is restored to normal. When the internal pressure of the buffer tank 22 is restored to normal, the outlet pipe 225 and the valve K of the outlet of the buffer tank 22 are manually opened. Since the outlet pipe 225 and the valve K of the buffer tank 22 correspond one-to-one with the injection pump of the injection machine, when the injection machine needs to inject liquid, the injection pump can automatically pump the electrolyte in the buffer tank into the station that needs to be injected. After the injection pump has been injecting liquid for a period of time, when the liquid level detection pipe 226 and the liquid level gauge J (upper and lower) of the buffer tank detect that the liquid level of the electrolyte in the buffer tank is insufficient, the buffer tank continues to perform the previous action to complete the liquid injection action from the defoaming tank.

[0093] Simultaneously, in the DMC buffer tank 23, when the DMC inlet pipe 233 and its corresponding valve K are opened, DMC enters the DMC buffer tank 23. The flow meter S on the DMC inlet pipe 233 can detect the DMC flow rate, and the pipeline filter 235 of the DMC inlet pipe 233 filters the incoming DMC. During the process of DMC entering the DMC buffer tank 23, the atmospheric pipe 232 of the DMC buffer tank and its corresponding valve K are in the open state. The liquid level detection pipe 236 and the liquid level gauge J (upper and lower) of the DMC buffer tank determine whether the DMC filling is full. When the DMC filling is full, the valve K of the DMC inlet pipe 233 is closed. When the equipment control system prompts that DMC needs to be used, the nitrogen pipeline 231 of the DMC buffer tank and its corresponding valve K, and the DMC outlet pipe 235 and its corresponding valve K are opened, so that the DMC to be used can be transported from the DMC buffer tank 23 to the corresponding station; when the liquid level detection pipeline 236 and the liquid level gauge J (upper and lower) of the DMC buffer tank detect that the DMC liquid level is insufficient, the DMC buffer tank 23 continues to perform the previous actions and starts to fill the liquid. Simultaneously, in the waste liquid tank 26, when the equipment control system prompts that waste liquid from the corresponding station inside the injection machine needs to be collected, the waste liquid inlet pipe 265 and its corresponding valve K, and the waste liquid tank vacuum pipe 263 and its corresponding valve K are opened. The external vacuum is used to draw the waste liquid from the corresponding station into the waste liquid tank. At this time, the liquid level detection pipe 268 and the liquid level gauge J (upper and lower) of the waste liquid tank 26 detect whether the waste liquid level is full. When the waste liquid is full, the waste liquid inlet pipe 265 and its corresponding valve K, the waste liquid tank vacuum pipe 263 and its corresponding valve K are closed, and the waste liquid tank nitrogen pipe 261 and its corresponding valve K, and the waste liquid tank outlet pipe 264 and its corresponding valve K are opened. The external nitrogen pressure is used to force the waste gas from the waste liquid tank 26 into the waste liquid collection pipe of the injection workshop for centralized collection and treatment.

[0094] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. A constant-temperature dispensing and storage device for lithium battery electrolyte, characterized in that, include: An electrolyte temperature control device, wherein the electrolyte inlet pipe of the electrolyte temperature control device is connected to the electrolyte chamber, and the electrolyte inlet pipe is connected to the electrolyte outlet pipe of the electrolyte temperature control device through a heat exchange pipe that passes through the oil heat exchange box in the electrolyte temperature control device; Electrolyte storage device, the electrolyte storage device comprising: A defoaming tank, wherein the electrolyte inlet of the defoaming tank is connected to the electrolyte outlet pipe of the electrolyte constant temperature device; The buffer tank has an electrolyte inlet connected to the electrolyte outlet of the defoaming tank, and the outlet of the buffer tank is connected to the injection pump of the injection machine.

2. The constant temperature liquid dispensing and storage device according to claim 1, characterized in that, The electrolyte constant temperature device also includes: A heat transfer oil heating box is provided, wherein a heating wire is provided in the heat transfer oil heating box, and the heat transfer oil heating box and the oil heat exchange box are connected by a circulation pipe, wherein a heat transfer oil pump is provided in the circulation pipe.

3. The constant temperature liquid dispensing and storage device according to claim 2, characterized in that, The electrolyte constant temperature device includes at least two of the oil heat exchange boxes; The electrolyte constant temperature device further includes at least two of the heat transfer oil heating boxes, and the heat exchange pipeline includes at least two heat exchange branch pipes, each of which passes through one of the oil heat exchange boxes.

4. The constant temperature liquid dispensing and storage device according to claim 1, characterized in that, The heat exchange pipe is a continuous S-shaped bend in the oil heat exchange tank.

5. The constant temperature liquid dispensing and storage device according to claim 1, characterized in that, The top of the defoaming tank is equipped with a vacuum pipe and an atmospheric pipe. An atmospheric duct filter is installed on the atmospheric duct of the defoamer tank.

6. The constant temperature liquid dispensing and storage device according to claim 1, characterized in that, The pipeline between the electrolyte inlet of the defoaming tank and the electrolyte outlet of the electrolyte constant temperature device is equipped with an incoming demagnetizer, an incoming filter, and an incoming differential pressure transmitter. The incoming demagnetizer is equipped with a demagnetizer exhaust port, and the incoming filter is equipped with a filter exhaust port.

7. The constant temperature liquid dispensing and storage device according to claim 1, characterized in that, The electrolyte storage device also includes a DMC buffer tank. The top of the DMC buffer tank is equipped with a nitrogen pipeline and an atmospheric pipeline. The bottom of the DMC buffer tank is connected to a DMC inlet pipe and a DMC outlet pipe, respectively. A pipeline filter is installed on the DMC inlet pipe, and the DMC outlet pipe is connected to the electrolyte inlet of the defoaming tank.

8. The constant temperature liquid dispensing and storage device according to claim 1, characterized in that, The electrolyte storage device also includes an outer casing, a liquid receiving tray at the bottom of the outer casing, a liquid level sensor in the liquid receiving tray, an electrolyte concentration detector on the inner wall of the outer casing, and a harmful gas detector on the outer wall of the outer casing.

9. The constant temperature liquid dispensing and storage device according to claim 8, characterized in that, It also includes a ventilation system, including: A ventilation duct extends into the outer casing of the device, and the ventilation duct is provided with multiple ventilation ports.

10. The constant temperature liquid dispensing and storage device according to claim 8, characterized in that, The electrolyte storage device also includes a waste liquid tank. The top of the waste liquid tank is provided with a nitrogen pipe, an atmospheric pipe, and a vacuum pipe. The bottom of the waste liquid tank is connected to a waste liquid inlet pipe and a waste liquid outlet pipe. The waste liquid inlet pipe is also provided with a waste liquid inlet branch pipe, which extends into the receiving tray.

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