CN119000666A - Visual liquid injection-infiltration process exploration method suitable for lithium ion power battery - Google Patents
Visual liquid injection-infiltration process exploration method suitable for lithium ion power battery Download PDFInfo
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Abstract
本发明提供一种适用于锂离子动力电池的可视化注液‑浸润工艺探究方法，属于电化学储能技术领域，包括由真空管道依次连通组成抽真空系统的真空泵、水分过滤器、化学过滤器、残液回收装置、压力传感器和真空管道阀门；具体为：通过泵入电解液至可视化壳体内部，并分别通过可视化面板从而实时跟踪电解液浸润极片过程的流态和流型，实时观察记录注液浸润过程的变化、温箱温度不变时，通过温度传感器探究电解液浸润温度及其不均匀性对于浸润的影响；当温箱温度变化时，控制其他变量不变，探究电解液在不同温度下的浸润速率；通过抽真空的方法探究压力对浸润的影响。本发明通过上述装置和方法，完成了对电解液浸润极片过程的最佳浸润工艺参数的探究。
The present invention provides a method for exploring a visualized liquid injection-infiltration process suitable for lithium-ion power batteries, which belongs to the field of electrochemical energy storage technology, and includes a vacuum pump, a moisture filter, a chemical filter, a residual liquid recovery device, a pressure sensor, and a vacuum pipe valve, which are connected in sequence by a vacuum pipe to form a vacuum pumping system; specifically: by pumping electrolyte into the inside of a visualized shell, and respectively tracking the flow state and flow type of the electrolyte infiltration process of the pole piece in real time through a visualized panel, real-time observation and recording of changes in the liquid injection and infiltration process, when the temperature of the incubator remains unchanged, the influence of the electrolyte infiltration temperature and its non-uniformity on the infiltration is explored through a temperature sensor; when the temperature of the incubator changes, other variables are controlled unchanged to explore the infiltration rate of the electrolyte at different temperatures; the influence of pressure on infiltration is explored by a vacuum pumping method. The present invention completes the exploration of the optimal infiltration process parameters for the electrolyte infiltration pole piece process through the above-mentioned device and method.
Description
Technical Field
The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a visual liquid injection-infiltration process exploration method suitable for a lithium ion power battery.
Background
In the field of power batteries, due to the light weight of the whole vehicle and the requirement of longer cruising mileage, higher energy density becomes a key index of attention of consumers, and higher requirements are put forward on the aspect of battery design. Under the same chemical system, the energy density can be improved by optimizing the design parameters of the pole piece, for example: pole piece design with higher compaction density, optimized conductive agent and electrolyte formulation.
However, the increase in compaction density presents a number of problems including difficulty in electrolyte infiltration, short term impact on cell capacity and efficiency performance, long term impact on cycle life and safety reliability-! Therefore, it is necessary to systematically study key parameters affecting the wetting speed of the electrolyte.
In addition, the electrical bi high Wen Jinrun is also a key process affecting the manufacturing cost ≡! Very low dew point and high temperature environments are required, typically over 24 hours. Therefore, the infiltration rate is considered from the design stage, and the infiltration rate is also significant for reducing the manufacturing cost. In addition, the high-temperature infiltration time of the existing monomer pole piece cannot be accurately obtained, so that the infiltration time is actually prolonged to a plurality of days in order to ensure complete infiltration, and the production efficiency is greatly reduced.
Therefore, there is a need for a method that can find the optimal wetting parameters to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a visual liquid injection-infiltration process exploration method suitable for a lithium ion power battery, which is characterized in that a visual liquid injection-infiltration process monitoring device is used for liquid injection infiltration, and the visual liquid injection-infiltration process monitoring device comprises a liquid injection system, a vacuumizing system and an infiltration visualization system;
the electrolyte injection system comprises an electrolyte storage chamber, wherein the electrolyte storage chamber is sequentially communicated with an electrolyte injection pump, a flowmeter, a first pressure sensor and an electrolyte injection pipeline valve through an electrolyte injection pipeline, and the other end of the electrolyte injection pipeline valve is communicated with the infiltration visualization system through a pipeline;
The vacuum pumping system comprises a vacuum pump, the vacuum pump is sequentially connected with a second pressure sensor and a vacuum pipeline valve through a vacuum pipeline, and the other end of the vacuum pipeline valve is communicated with the infiltration visualization system through a pipeline;
the infiltration visualization system is arranged in the temperature control device and comprises a visualization shell, wherein a pole piece is clamped in the visualization shell through a pole piece fixing piece, and a plurality of temperature sensors are distributed in the visualization shell;
the visual liquid injection-infiltration process exploration method specifically comprises the following steps:
S1: opening a valve of a liquid injection pipeline and starting a liquid injection pump, pumping electrolyte in the electrolyte storage chamber into the visual infiltration shell through a liquid injection pipeline, and at the moment, obtaining the liquid injection pressure and the liquid injection quantity in the liquid injection pipeline by observing a first pressure sensor and a flowmeter;
S2: when electrolyte starts to be injected into the visual shell, tracking the flow state and the flow pattern of the electrolyte in the process of infiltrating the pole piece in real time by a visual observation or instrument recording method, and observing and recording the change of the electrolyte injecting infiltration process in real time;
S3: under the condition that the internal temperature of the temperature control device is unchanged, as the electrolyte is gradually soaked into the visual shell, the influence of the soaking temperature and the non-uniformity of the soaking temperature on the soaking is explored through a plurality of distributed temperature sensors;
S4: changing the temperature inside the temperature control device, ensuring that other variables are unchanged, and exploring the infiltration rate of the electrolyte at different temperatures in the process of infiltrating the electrolyte into the pole piece through a plurality of temperature sensors;
S5: closing a valve of the liquid injection pipeline, opening a vacuum valve and starting a vacuum pump, and changing the pressure in the visual shell by a vacuumizing method, so as to explore the influence of the infiltration pressure on infiltration;
The visual liquid injection-infiltration process exploration method is integrated with S1-S5, and optimal infiltration parameters are obtained by exploring factors of different variables affecting the infiltration of the pole pieces.
Further, the vacuumizing system further comprises a moisture filter, a chemical filter and a residual liquid recovery device, and the vacuum pump, the moisture filter, the chemical filter, the residual liquid recovery device, the pressure sensor and the pressure valve are communicated through vacuum pipelines in sequence.
Further, the temperature control device is an incubator, and the controllable temperature of the incubator is-20 ℃ to 100 ℃.
Further, the temperature sensors are distributed at the key positions of the temperature monitoring of the visual shell, the number of the key positions of the temperature monitoring of the visual shell is set to be between 1 and 100, and each key position of the temperature monitoring of the visual shell is provided with one temperature sensor.
Further, the pressure of the visualization shell is set between-2 standard atmospheres and 2 standard atmospheres.
Further, in S2, the visual shell is composed of a visual panel, when electrolyte starts to be injected into the visual shell, the flow state and the flow pattern of the electrolyte infiltrating process of the pole piece are tracked in real time through the visual panel, and the change of the electrolyte infiltrating process is observed and recorded in real time.
Compared with the prior art, the invention has the beneficial effects that:
1. The visual shell is composed of the visual panel, when electrolyte is injected into the shell, the flow state and the flow pattern of the electrolyte in the process of infiltrating the pole piece can be tracked in real time, the change of the electrolyte in the process of infiltrating is observed and recorded in real time, and various factors affecting the infiltration rate can be more conveniently explored.
2. According to the invention, a plurality of temperature acquisition points at key positions are designed around the inside of the visual shell, the temperature of the key positions of the pole piece is acquired in the process of impregnating the pole piece with electrolyte, and the influence of the impregnating temperature and the non-uniformity of the impregnating temperature on the impregnating is explored by comparing the impregnating rates of the electrolyte at different temperatures.
3. The visual shell is arranged in the temperature box, and the temperature of the temperature box is changed, so that other variables such as pressure are kept unchanged, and the infiltration rate of the electrolyte at different temperatures can be more accurately explored in the process of infiltrating the electrolyte into the pole piece.
4. According to the invention, the visual shell is vacuumized by using the vacuum pipeline, the pressure in the visual shell is monitored in real time by the pressure sensor on the vacuum pipeline, and meanwhile, the influence of the infiltration pressure on the infiltration rate is explored by changing the pressure in the visual shell.
Drawings
FIG. 1 is a schematic diagram of a visual liquid injection-infiltration process detection device according to the present invention.
Fig. 2 is a schematic structural view of a pole piece fixture inside a visual housing of the present invention.
Fig. 3 is a schematic diagram of an implementation scheme of a visual liquid injection-infiltration process exploration method suitable for a lithium ion power battery.
In the figure, 1, a vacuum pump; 2. a vacuum pipeline; 3. a moisture filter; 4. a chemical filter; 5. a raffinate recovery unit; 6. a second pressure sensor; 7. a vacuum pipeline valve; 8. a liquid injection pipeline valve; 9. a first pressure sensor; 10. a flow meter; 11. a liquid injection pump; 12. a liquid injection pipeline; 13. an electrolyte storage chamber; 14. a pole piece fixing piece; 15. a pole piece; 16. a temperature sensor; 17. a visual housing; 18. an incubator.
Detailed Description
A more detailed description of a visual liquid injection-infiltration process exploration method for lithium-ion power cells, in which preferred embodiments of the present invention are shown, will be presented below in conjunction with the schematic drawings, it being understood that one skilled in the art may modify the invention described herein while still achieving the beneficial effects of the invention and, therefore, the following description should be construed as broadly known to those skilled in the art and not as limiting the invention.
As shown in fig. 1, a visual liquid injection-infiltration process exploration method suitable for a lithium ion power battery is disclosed, wherein the exploration is performed by using a visual liquid injection-infiltration process detection device. The device comprises a liquid injection system, a pressure vacuumizing system and an infiltration visualization system.
The electrolyte injection system comprises an electrolyte storage chamber 13, wherein the electrolyte storage chamber is communicated with an electrolyte injection pipeline 12, and is sequentially communicated with an electrolyte injection pump 11, a flowmeter 10, a first pressure sensor 9 and an electrolyte injection pipeline valve 8 through the electrolyte injection pipeline 12, and the other end of the electrolyte injection pipeline valve 8 is communicated with the infiltration visualization system through a pipeline. When the visual liquid injection-infiltration process monitoring device pumps electrolyte into the infiltration visual system through the electrolyte storage chamber 13, the liquid injection pressure and the liquid injection amount in the liquid injection pipeline 12 are respectively obtained through the first pressure sensor 9 and the flowmeter 10.
The pressure vacuumizing system comprises a vacuum pump 1, wherein the vacuum pump 1 is sequentially communicated with a moisture filter 3, a chemical filter 4, a residual liquid recovery device 5, a second pressure sensor 6 and a vacuum pipeline valve 7 through a vacuum pipeline 2, and the other end of the vacuum pipeline valve 7 is communicated with an infiltration visualization system through a pipeline. The invention changes the pressure in the infiltration visualization system in a vacuumizing mode, and explores the influence of the pressure on infiltration under the condition that other parameters are kept unchanged, and the specific regulation and control method of the injection pressure is as follows: closing the vacuum pipeline valve, pumping electrolyte into the visual shell by the liquid injection pump, continuously increasing the pressure in the visual shell, closing the liquid injection pipeline valve, opening the vacuum pipeline valve, and opening the vacuum pump.
The infiltration visualization system comprises a visualization housing 17, the pressure of which is set between-2 standard atmospheres and 2 standard atmospheres. The inside of the visual shell 17 is provided with a plurality of temperature monitoring key positions, each key position is provided with a temperature sensor 16 for sensing the temperature of the key position, and the number of the temperature monitoring key positions is 1-100. Referring to fig. 2, the inside of the visual shell 17 is further clamped with a pole piece 15 by a pole piece fixing piece 14, the pole piece fixing piece 14 is formed by two pieces of aluminum alloy with head ends bent and expanded upwards, opposite surfaces of tail ends are formed by welding and fixing, an expanded included angle is 45 degrees, and the opposite surfaces are fixed on the side face inside the visual shell 17 by the end parts of the tail ends. The pole piece 15 is plugged into the head end of the pole piece fixing piece, and the clamping of the pole piece 15 is completed through the characteristic of flexible memory alloy of the pole piece fixing piece 14.
The visual shell 17 is placed inside a temperature control device, the temperature control device is an incubator 18, and the controllable temperature of the incubator 18 is set between-120 ℃ and 100 ℃. The vacuum pump 1 and the liquid injection pump 11 are communicated with the inside of the visual shell 17 through pipelines, so that the change of the environmental parameters around the pole piece 15 is realized.
The invention implements a visual liquid injection-infiltration process exploration method suitable for a lithium ion power battery through a visual liquid injection-infiltration process monitoring device, which is used for obtaining optimal infiltration parameters, and specifically comprises the following steps of:
Step 1
The valve 8 of the liquid injection pipe is opened, the liquid injection pump 11 is started, and the electrolyte in the electrolyte storage chamber 13 is pumped into the visualization shell 17 through the liquid injection pipe 12, and at this time, the liquid injection pressure and the liquid injection amount in the liquid injection pipe 12 are obtained by observing the first pressure sensor 9 and the flowmeter 10.
Step 2
When electrolyte starts to be injected into the visualization shell 17, the flow state and the flow pattern of the electrolyte infiltrating process of the pole piece 15 are tracked in real time by a visual observation or instrument recording method, and the change of the electrolyte infiltrating process is observed and recorded in real time. The visualization shell 17 is specifically configured to be composed of a visualization panel, and various factors influencing the infiltration rate can be more conveniently explored through the visualization panel.
Step 3
In the case where the temperature inside the incubator 18 is constant, as the inside of the visualization housing 17 is gradually filled with the electrolyte, the influence of the infiltration temperature and the non-uniformity thereof on the infiltration is investigated by the plurality of temperature sensors 16 provided in a distributed manner.
Step 4
The temperature inside the temperature box 18 is changed, other variables are kept unchanged, and the infiltration rate of the electrolyte at different temperatures in the process of infiltrating the electrolyte into the pole piece 15 is explored through a plurality of temperature sensors 16.
Step 5
The valve 8 of the liquid injection pipeline is closed, the vacuum valve 7 is opened, the vacuum pump 1 is started, and the pressure inside the visual shell 17 is changed by a vacuumizing method, so that the influence of the infiltration pressure on infiltration is explored.
The invention combines the above 5 steps, and obtains the optimal infiltration parameters by exploring the factors of different variables affecting the infiltration of the pole piece 15.
The feasibility of the visual liquid injection-infiltration process exploration method suitable for the lithium ion power battery is further described by the following specific examples.
1. The temperature of the incubator is set to be 30 ℃, the vacuum pipeline valve is closed, the liquid injection pipeline valve is opened, lithium battery electrolyte is pumped into the visual shell through the liquid injection pipeline, the vacuum pipeline valve is opened in the process, the current pressure is stabilized at 1kpa according to the current pressure displayed by the pressure sensor by combining the vacuum pump and the liquid injection pump, and the time for recording that the electrolyte completely infiltrates the pole piece is 36h.
2. The temperature of the incubator is set to be 30 ℃, the vacuum pipeline valve is closed, the liquid injection pipeline valve is opened, lithium battery electrolyte is pumped into the visual shell through the liquid injection pipeline, the vacuum pipeline valve is opened in the process, the current pressure is stabilized at 20kpa according to the current pressure displayed by the pressure sensor by combining the vacuum pump and the liquid injection pump, and the time for recording that the electrolyte completely infiltrates the pole piece is 8.5h.
3. Comparing the soak time at 1ka with the soak time at 20kpa, the soak rate was faster at 20 kpa.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the invention without departing from the scope of the technical solution of the invention, and the technical solution of the invention is not departing from the scope of the invention.
Claims (6)
1. The visual liquid injection-infiltration process exploration method suitable for the lithium ion power battery is characterized by comprising the steps of carrying out liquid injection infiltration by using a visual liquid injection-infiltration process monitoring device, wherein the visual liquid injection-infiltration process monitoring device comprises a liquid injection system, a vacuumizing system and an infiltration visualization system;
the electrolyte injection system comprises an electrolyte storage chamber, wherein the electrolyte storage chamber is sequentially communicated with an electrolyte injection pump, a flowmeter, a first pressure sensor and an electrolyte injection pipeline valve through an electrolyte injection pipeline, and the other end of the electrolyte injection pipeline valve is communicated with the infiltration visualization system through a pipeline;
The vacuum pumping system comprises a vacuum pump, the vacuum pump is sequentially connected with a second pressure sensor and a vacuum pipeline valve through a vacuum pipeline, and the other end of the vacuum pipeline valve is communicated with the infiltration visualization system through a pipeline;
The infiltration visualization system is arranged in the temperature control device and comprises a visualization shell, wherein a pole piece is clamped in the visualization shell through a pole piece fixing piece, and a plurality of temperature sensors are distributed in the visualization shell;
the visual liquid injection-infiltration process device exploration method specifically comprises the following steps:
S1: opening a valve of a liquid injection pipeline and starting a liquid injection pump, pumping electrolyte in the electrolyte storage chamber into the visual infiltration shell through a liquid injection pipeline, and at the moment, obtaining the liquid injection pressure and the liquid injection quantity in the liquid injection pipeline by observing a first pressure sensor and a flowmeter;
S2: when electrolyte starts to be injected into the visual shell, tracking the flow state and the flow pattern of the electrolyte in the process of infiltrating the pole piece in real time by a visual observation or instrument recording method, and observing and recording the change of the electrolyte injecting infiltration process in real time;
S3: under the condition that the internal temperature of the temperature control device is unchanged, as the electrolyte is gradually soaked into the visual shell, the influence of the soaking temperature and the non-uniformity of the soaking temperature on the soaking is explored through a plurality of distributed temperature sensors;
S4: changing the temperature inside the temperature control device, ensuring that other variables are unchanged, and exploring the infiltration rate of the electrolyte at different temperatures in the process of infiltrating the electrolyte into the pole piece through a plurality of temperature sensors;
S5: closing a valve of the liquid injection pipeline, opening a vacuum valve and starting a vacuum pump, and changing the pressure in the visual shell by a vacuumizing method, so as to explore the influence of the infiltration pressure on infiltration;
The visual liquid injection-infiltration process exploration method is integrated with S1-S5, and optimal infiltration parameters are obtained by exploring factors of different variables affecting the infiltration of the pole pieces.
2. The visual liquid injection-infiltration process exploration method suitable for the lithium ion power battery according to claim 1, wherein the vacuumizing system further comprises a moisture filter, a chemical filter and a residual liquid recovery device, and the vacuum pump, the moisture filter, the chemical filter, the residual liquid recovery device, the pressure sensor and the pressure valve are communicated through vacuum pipelines in sequence.
3. The visual liquid injection-infiltration process exploration method applicable to a lithium ion power battery according to claim 1, wherein the temperature control device is an incubator, and the controllable temperature of the incubator is-20 ℃ to 100 ℃.
4. The visual liquid injection-infiltration process exploration method suitable for the lithium ion power battery according to claim 1, wherein the temperature sensors are distributed at the key positions of the visual shell temperature monitoring, the number of the key positions of the visual shell temperature monitoring is set to be between 1 and 100, and each key position of the visual shell temperature monitoring is provided with one temperature sensor.
5. The visual liquid injection-infiltration process exploration method suitable for the lithium ion power battery according to claim 1, the pressure of the visual shell is set between-2 standard atmospheres and 2 standard atmospheres.
6. The visual liquid injection-infiltration process exploration method suitable for the lithium ion power battery according to claim 1, wherein in the step S2, the visual shell is composed of a visual panel, and when electrolyte starts to be injected into the visual shell, the flow state and the flow pattern of the process of infiltrating the electrolyte into the pole piece are tracked in real time through the visual panel, and the change of the liquid injection infiltration process is observed and recorded in real time.
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| CN110380124A (en) * | 2019-07-19 | 2019-10-25 | 北京理工大学 | It is a kind of can in-situ characterization lithium battery electrolytes three-dimensional impregnation process quantitative method |
| CN114256565A (en) * | 2020-09-11 | 2022-03-29 | 深圳市科晶智达科技有限公司 | Battery processing method applying vacuum liquid injection sealing machine |
| CN214428754U (en) * | 2020-12-03 | 2021-10-19 | 联动天翼新能源有限公司 | Visual priming device of square lithium cell |
| CN112858103A (en) * | 2021-01-11 | 2021-05-28 | 湖北亿纬动力有限公司 | Wettability testing device and testing method thereof |
| CN218297934U (en) * | 2022-05-07 | 2023-01-13 | 蔚来汽车科技(安徽)有限公司 | System for detecting electrolyte wettability of storage battery |
| CN116487837A (en) * | 2023-01-06 | 2023-07-25 | 广东顺德工业设计研究院(广东顺德创新设计研究院) | A vacuum liquid injection system and liquid injection method for aluminum shell battery electrolyte |
| CN219180743U (en) * | 2023-02-01 | 2023-06-13 | 合肥国轩高科动力能源有限公司 | Casing battery priming device |
| CN117638432A (en) * | 2023-12-28 | 2024-03-01 | 珠海科创储能科技有限公司 | Liquid injection device and liquid injection control method |
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