Lithium battery electrolyte heating device

Abstract

The utility model belongs to the technical field of battery manufacturing, and particularly relates to a lithium battery electrolyte heating device which comprises an electrolyte heating pipe and an electrolyte normal-temperature pipe which are connected in parallel, and the liquid discharge ends of the electrolyte heating pipe and the electrolyte normal-temperature pipe are respectively connected with a liquid inlet end pipeline of a three-way valve. And an electrolyte density sensor for detecting the density of the electrolyte and a temperature sensor for detecting the temperature of the electrolyte are connected to a liquid discharge end pipeline of the three-way valve. The device is convenient to maintain and good in compatibility, when the pipeline is blocked, damaged and the like, a standby pipeline can be rapidly disassembled and installed for replacement, the electrolyte heating function can be achieved after an existing liquid injection machine is simply transformed, and upgrading and transformation of a production line are completed.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and in particular relates to a lithium battery electrolyte heating device. Background Art

[0002] In the production process of lithium batteries, the injection process of injecting electrolyte into the battery affects the production efficiency and product performance of the lithium battery manufacturing process. At present, the injection process mostly adopts normal temperature injection, and the electrolyte flows into the lithium battery through the injection pump and the pressure difference, so that the electrode is soaked in the electrolyte. However, the flow rate of the electrolyte and the infiltration rate of the electrolyte to the electrode are relatively slow at room temperature, and it is necessary to improve the infiltration effect of the electrolyte on the electrode through positive and negative pressure cycle static, high temperature static and other methods.

[0003] Heating the electrolyte can improve the wetting effect of the electrolyte on the electrode. After heating, the viscosity of the electrolyte decreases and the fluidity is better. At the same time, after the heated electrolyte is injected into the lithium battery, the temperature of the electrode increases, the pores on the surface of the electrode increase, and the wetting effect is improved. Some of the devices currently proposed for heating the electrolyte heat the electrolyte by wrapping and heating the electrolyte delivery pipeline. For example, a Chinese patent discloses an electrolyte injection system device, application number: CN202221166489.6, which includes an electrolyte storage device, a constant temperature buffer device, an injection device and a battery to be injected in sequence. A heating device is arranged on the pipeline between the electrolyte storage device and the constant temperature buffer device, a circulating liquid outlet is opened on the top of the constant temperature buffer device, and a circulating liquid inlet is opened on the top of the electrolyte storage device. A circulating pipe is connected between the circulating liquid outlet and the circulating liquid inlet, and the gas in the constant temperature buffer device enters the electrolyte storage device through the circulating pipe. The electrolyte heating device in the prior art has the following disadvantages: 1. It requires relatively large changes to the existing production line in order to be combined with this structure. The modification cost is high, the time is long, and the versatility is poor. If the heating device fails, the injection pipeline is blocked or leaks, this structure will be difficult to disassemble and maintain later; 2. The change in electrolyte density at different required temperatures will cause the injection volume to change. This device has poor compatibility and needs to be recalibrated and adjusted; 3. If an electrolyte leak occurs, this structure cannot provide timely feedback and processing. Utility Model Content

[0004] The purpose of the utility model is to provide a lithium battery electrolyte heating device to solve the problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lithium battery electrolyte heating device, comprising an electrolyte heating tube and an electrolyte constant temperature tube connected in parallel, wherein the discharge ends of the electrolyte heating tube and the electrolyte constant temperature tube are respectively connected to the liquid inlet end pipeline of the three-way valve, and the discharge end pipeline of the three-way valve is connected with an electrolyte density sensor for detecting the electrolyte density and a temperature sensor for detecting the electrolyte temperature. This structure is easy to maintain. If the pipeline is blocked, damaged or other faults occur, it can be quickly disassembled and a spare pipeline can be installed for replacement. The temperature sensor detects the electrolyte temperature. When it is detected that the electrolyte temperature is too high, the heating source of the electrolyte heating tube is controlled to be turned on and off, and the power is adjusted to adjust the heating effect, so that the electrolyte temperature is within the set range. Heating the electrolyte will cause the electrolyte density to change, thereby affecting the electrolyte injection accuracy, so the electrolyte density is detected by the electrolyte density sensor.

[0006] Preferably, the liquid inlet end of the electrolyte heating tube is connected to an electrolyte preheating tube, and the electrolyte preheating tube is connected to a pipeline on one side of the liquid outlet direction of the three-way joint through an electrolyte preheating tube inlet valve. The electrolyte is preheated by the electrolyte preheating tube, and the electrolyte heating tube heats the preheated electrolyte to improve the heating efficiency.

[0007] Preferably, the outside of the heating source of the electrolyte heating tube and the electrolyte preheating tube is respectively wrapped with a heat-insulating layer, so as to separate the heat source from the external environment and ensure the electrolyte heating effect.

[0008] Preferably, the liquid inlet end of the electrolyte constant temperature tube is connected to the pipeline on the other side of the liquid outlet direction of the three-way joint through an electrolyte constant temperature tube inlet valve. The electrolyte constant temperature tube inlet valve is used to control the closing condition of the electrolyte constant temperature tube.

[0009] Preferably, an electrolyte flow sensor is also connected to the discharge end pipeline of the three-way valve. The electrolyte flow sensor detects the electrolyte flow. When it is detected that the electrolyte flow is too low, the industrial computer controls the injection pump to increase the electrolyte delivery speed. When the electrolyte flow is too high, the industrial computer controls the injection pump to reduce the electrolyte delivery speed. When the pipeline or valve is blocked or damaged, the electrolyte flow fluctuates. The electrolyte flow sensor detects that the flow is too small and then feeds back to the industrial computer, which is convenient for production personnel to troubleshoot.

[0010] Preferably, an electrolyte outlet valve is connected to the end of the three-way valve's discharge end pipeline, the electrolyte outlet valve's discharge end is connected to an electrolyte outlet connector, and the three-way connector's inlet end is connected to an electrolyte inlet connector. The electrolyte inlet connector and electrolyte outlet connector facilitate quick connection with existing pipelines, and the electrolyte heating function can be realized after a simple modification of the existing injection machine, completing the production line upgrade and modification.

[0011] Preferably, it also includes an electrolyte heating box, which covers the above components inside. A float level switch for monitoring the electrolyte accumulation inside the box is installed in one corner of the electrolyte heating box. The float level switch is used to detect the electrolyte level inside the electrolyte heating box. If it exceeds the set height, the entire device will sound an alarm and close all valves, thereby improving the safety of the device.

[0012] Preferably, a combustible gas detector for monitoring electrolyte gas is installed on the inner wall of the electrolyte heating box. When the electrolyte leaks, the combustible gas detector detects the electrolyte gas leakage and closes all valves, thereby improving the safety of the device.

[0013] Preferably, an inclined plate is provided at the bottom of the electrolyte heating box. When a leak occurs in the internal pipeline of the electrolyte heating box, the electrolyte flows onto the inclined plate under the action of gravity, and then due to the certain inclination of the inclined plate, the electrolyte will gather on one side of the electrolyte heating box, so that the electrolyte leakage can be quickly detected.

[0014] Preferably, handles are installed on both sides of the electrolyte heating box to facilitate installation and transportation of the lithium battery electrolyte heating device.

[0015] The beneficial effects of the utility model are as follows: 1. The device is easy to maintain and has good compatibility. When the pipeline is blocked, damaged or other faults occur, it can be quickly disassembled and a spare pipeline can be installed for replacement. The electrolyte heating function can be realized after a simple modification of the existing liquid injection machine, completing the upgrade and modification of the production line;

[0016] 2. An electrolyte density sensor, a temperature sensor and an electrolyte flow sensor are set up, and parameter models such as temperature, electrolyte density and electrolyte volume are pre-established, so that the electrolyte injection volume after heating can be detected and adjusted in real time, so that the injection volume is always within the set range, ensuring the stability of the electrolyte injection volume;

[0017] 3. By setting up an electrolyte heating box and setting corresponding tilting plates, combustible gas detectors and float level switches inside, the gas in the electrolyte and the liquid level of the electrolyte are detected. When leakage occurs, an alarm is triggered and all valves are closed, thereby improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the internal structure of this embodiment.

[0019] Figure 2 This is a three-dimensional diagram of the present embodiment without the electrolyte heating box;

[0020] Figure 3 is a stereoscopic diagram of the electrolyte heating tube and the electrolyte preheating tube in this embodiment;

[0021] Figure 4 is a cross-sectional view of the electrolyte heating tube and the electrolyte preheating tube in this embodiment;

[0022] Figure 5 is a cross-sectional view of the electrolyte heating box in this embodiment;

[0023] Figure 6 It is a three-dimensional diagram of this embodiment.

[0024] In the figure:

[0025] 1: electrolyte outlet connector; 2: electrolyte heating box; 3: electrolyte outlet valve; 4: electrolyte flow sensor; 5: electrolyte density sensor; 6: temperature sensor; 7: three-way valve; 8: insulation layer; 9: electrolyte heating tube; 10: electrolyte preheating tube; 11: electrolyte preheating tube inlet valve; 12: electrolyte normal temperature tube inlet valve; 13: three-way connector; 131, pipeline on one side of the outlet direction; 132, pipeline on the other side of the outlet direction; 14: electrolyte normal temperature tube; 15: electrolyte normal temperature tube insulation layer; 16: tilting plate; 17: float level switch; 18: handle; 19: combustible gas detector; 20: electrolyte inlet connector. DETAILED DESCRIPTION

[0026] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0027] like Figure 1 and Figure 2As shown, a lithium battery electrolyte heating device includes an electrolyte heating box 2, one side of the lithium battery heating box is provided with an opening, an electrolyte inlet joint 20 is connected to the electrolyte pipeline and connected to the three-way joint 13 through the opening, and a pipeline 131 on one side of the three-way joint 13 in the liquid outlet direction is connected to the electrolyte preheating pipe inlet valve 11 to control the liquid inlet and cutoff of the electrolyte preheating pipe 10. A pipeline 132 on the other side of the three-way joint 13 in the liquid outlet direction is connected to the electrolyte constant temperature pipe inlet valve 12 to control the liquid inlet and cutoff of the electrolyte constant temperature pipe 14. The electrolyte heating pipe 9 and the electrolyte constant temperature pipe 14 are connected to the liquid inlet end of the three-way valve 7, and the three-way valve 7 switches the electrolyte heating pipe 9 to transport the electrolyte or the electrolyte constant temperature pipe 14 to transport the electrolyte, and at the same time prevents the electrolyte from flowing into the other side when the electrolyte is transported on one side of the three-way valve 7 or the electrolyte on the other side flows out. The three-way valve 7 is connected to the temperature sensor 6, the temperature sensor 6 is connected to the electrolyte density sensor 5, and the electrolyte density sensor 5 is connected to the electrolyte flow sensor 4. The temperature sensor 6 detects the electrolyte temperature. When it is detected that the electrolyte temperature is too high, the heating source of the electrolyte preheating tube 10 and the electrolyte heating tube 9 is controlled to be turned on and off, and the power is adjusted to adjust the heating effect, so that the electrolyte temperature is within the set range. Heating will change the electrolyte density, thereby affecting the electrolyte injection accuracy, so the electrolyte density is detected by the electrolyte density sensor 5. The electrolyte flow sensor 4 detects the electrolyte flow. When it is detected that the electrolyte flow is too low, the industrial computer controls the injection pump to increase the electrolyte delivery speed. When the electrolyte flow is too high, the industrial computer controls the injection pump to reduce the electrolyte delivery speed. When the pipeline or valve is blocked or damaged, the electrolyte flow fluctuates. After the electrolyte flow sensor detects that the flow is too small, it feeds back to the industrial computer, which is convenient for production personnel to troubleshoot.

[0028] Before the application of the lithium battery electrolyte heating device, the electrolyte should be tested. The electrolyte density at different temperatures is collected by the temperature sensor 6 and the electrolyte density sensor 5 to obtain the corresponding relationship between temperature and density, and a model is established through the corresponding relationship. According to the model, the parameters required for the lithium battery electrolyte heating device, such as the electrolyte preheating temperature, electrolyte heating temperature, and electrolyte flow rate, are reasonably set.

[0029] During use, the lithium battery electrolyte heating device collects parameters in real time through the temperature sensor 6 and the electrolyte density sensor 5. At the same time, the lithium battery electrolyte heating device and the injection pump are connected to the industrial computer. The injection pump can ensure the constant flow of electrolyte, and can adjust the electrolyte delivery volume and delivery speed in real time according to the industrial computer signal. When the electrolyte injection volume does not meet the set requirements, the lithium battery injection volume can be adjusted by adjusting the electrolyte delivery volume. When the electrolyte temperature does not meet the set requirements, the electrolyte heating effect can also be improved by changing the electrolyte delivery speed.

[0030] like Figure 3 and Figure 4As shown, the electrolyte preheating tube 10 is wrapped with a resistance wire as a heating source, and the electrolyte preheating tube 10 is heated by controlling the resistance wire to transfer heat to the electrolyte. The heating source of the electrolyte preheating tube 10 is wrapped with an insulation layer 8 on the outside, and the electrolyte preheating tube 10 and the heating source are separated from the inside of the electrolyte heating box to ensure the heating effect of the electrolyte. The heating source of the electrolyte heating tube 9 is wrapped with an insulation layer 8 on the outside, and the electrolyte heating tube 9 and the heating source are separated from the inside of the electrolyte heating box to ensure the heating effect of the electrolyte. The electrolyte preheating tube 10 preheats the electrolyte, and the electrolyte heating tube 9 heats the preheated electrolyte to improve the heating efficiency. The electrolyte constant temperature tube 14 is wrapped with an insulation layer 8 on the outside, and the electrolyte constant temperature tube 14 is separated from the inside of the electrolyte heating box to ensure that the electrolyte is not affected by the temperature inside the box.

[0031] When the electrolyte preheating tube 10 and the electrolyte heating tube 9 are damaged or need to be replaced due to other faults, the pipeline between the three-way valve 7 and the electrolyte preheating tube inlet valve 11 can be removed, and the spare electrolyte preheating tube 10 and the electrolyte heating tube 9 can be replaced. After passing the inspection, they can continue to be used, reducing the maintenance and installation time.

[0032] The electrolyte constant temperature tube 14 can be used to check the amount of electrolyte injected after heating. During the check, the electrolyte preheating tube inlet valve 11 is opened, the electrolyte heating tube and the liquid outlet passage of the three-way valve 7 are opened, the electrolyte outlet valve 3 is opened, and the injection pump delivers a certain amount of electrolyte to the lithium battery electrolyte heating device. After preheating and heating, the electrolyte flows out from the electrolyte outlet connector 1. After the injection is completed, the electrolyte preheating tube inlet valve 11 is closed, the electrolyte outlet valve 3 is closed, and the electrolyte flowing out after heating is weighed to obtain the amount of electrolyte injected after heating. After weighing, the electrolyte normal temperature pipe inlet valve 12 is opened, the electrolyte normal temperature pipe and the liquid outlet passage of the three-way valve 7 are opened, the electrolyte outlet valve 3 is opened, and the injection pump is used to pump liquid to discharge the heated electrolyte remaining in the pipeline. Then the injection pump delivers a certain amount of electrolyte to the lithium battery electrolyte heating device, and the normal temperature electrolyte flows out through the electrolyte outlet connector 1. The normal temperature electrolyte is weighed to obtain the normal temperature electrolyte injection amount. By comparing the electrolyte injection amount after heating with the normal temperature electrolyte injection amount, the electrolyte change before and after heating can be obtained. When the electrolyte change does not meet the requirements, adjust the preheating temperature, heating temperature, flow rate, flow rate and other parameters for re-calibration until the electrolyte change meets the set requirements.

[0033] like Figure 5 and Figure 6As shown, an inclined plate 16 is installed at the bottom of the electrolyte heating box 2. When the internal pipeline of the electrolyte heating box 2 leaks, the electrolyte flows onto the inclined plate 16 under the action of gravity. Then, due to the certain inclination of the inclined plate 16, the electrolyte will gather on one side of the electrolyte heating box 2. A float liquid level switch 17 is installed at one corner of the electrolyte heating box. When the electrolyte continues to gather, the liquid level rises and is sensed by the float liquid level switch 17 and outputs a signal. After receiving the signal, the industrial computer controls the electrolyte preheating inlet valve 11, the electrolyte normal temperature inlet valve 12 and the electrolyte outlet valve 3 to be closed. A combustible gas detector 19 is installed on the inner wall of the electrolyte heating box. When the electrolyte leaks, the combustible gas detector 19 detects the electrolyte leakage gas. After receiving the signal, the industrial computer controls the electrolyte preheating inlet valve 11, the electrolyte normal temperature inlet valve 12 and the electrolyte outlet valve 3 to be closed.

[0034] When modifying the existing electrolyte injection pipeline, the original electrolyte injection pipeline can be cut off and a joint can be installed to connect to the electrolyte inlet joint 20 and the electrolyte outlet joint 1 of the lithium battery electrolyte heating device, thereby reducing the installation and debugging time and increasing the modification speed. When the electrolyte does not need to be heated, the electrolyte inlet joint 20 and the electrolyte outlet joint can be disconnected from the original electrolyte pipeline, and then the original electrolyte pipeline joint can be connected to complete the separation of the lithium battery electrolyte heating device from the original equipment.

[0035] like Figure 6 As shown, two pairs of handles 18 are installed on the side wall of the electrolyte heating box 2 to facilitate the installation and transportation of the lithium battery electrolyte heating device.

[0036] Furthermore, the electrolyte preheating tube 10 and the electrolyte heating tube 9 can be expanded into many channels according to the injection requirements, and multiple electrolytes can be preheated and heated at the same time to improve production efficiency. At the same time, one channel is reserved. When one electrolyte pipeline fails, it can be switched to the spare channel for heating to reduce the impact of the failure on production capacity.

[0037] For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as within the protection scope of the utility model.

Claims

1. A lithium battery electrolyte heating device, comprising an electrolyte heating tube and an electrolyte constant temperature tube connected in parallel, characterized in that: The discharge ends of the electrolyte heating tube and the electrolyte constant temperature tube are respectively connected to the liquid inlet pipeline of the three-way valve, and the discharge pipeline of the three-way valve is connected to an electrolyte density sensor for detecting electrolyte density and a temperature sensor for detecting electrolyte temperature; The liquid inlet end of the electrolyte heating tube is connected to an electrolyte preheating tube, and the electrolyte preheating tube is connected to a pipeline on one side of the liquid outlet direction of the three-way joint through an electrolyte preheating tube liquid inlet valve.

2. The lithium battery electrolyte heating device according to claim 1, characterized in that: The outsides of the heating sources of the electrolyte heating tube and the electrolyte preheating tube are respectively wrapped with a thermal insulation layer.

3. The lithium battery electrolyte heating device according to claim 1, characterized in that: The liquid inlet end of the electrolyte constant temperature pipe is connected to the pipeline on the other side of the liquid outlet direction of the three-way joint through the electrolyte constant temperature pipe liquid inlet valve.

4. The lithium battery electrolyte heating device according to claim 1, characterized in that: The discharge end pipeline of the three-way valve is also connected with an electrolyte flow sensor.

5. The lithium battery electrolyte heating device according to claim 4, characterized in that: An electrolyte outlet valve is connected to the end of the discharge end pipeline of the three-way valve, the discharge end of the electrolyte outlet valve is connected to an electrolyte outlet connector, and the inlet end of the three-way connector is connected to an electrolyte inlet connector.

6. The lithium battery electrolyte heating device according to claim 1, characterized in that: It also includes an electrolyte heating box, which covers the above components inside. A float liquid level switch for monitoring the electrolyte accumulation inside the box is installed in a corner inside the electrolyte heating box.

7. The lithium battery electrolyte heating device according to claim 6, characterized in that: The inner wall of the electrolyte heating box is installed with a combustible gas detector for monitoring the electrolyte gas.

8. The lithium battery electrolyte heating device according to claim 6, characterized in that: An inclined plate is provided at the bottom of the electrolyte heating box.

9. The lithium battery electrolyte heating device according to claim 6, characterized in that: Handles are installed on both sides of the outside of the electrolyte heating box.

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