CN219696511U - Electrolyte loss metering device in lithium battery formation process - Google Patents
Electrolyte loss metering device in lithium battery formation process Download PDFInfo
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- CN219696511U CN219696511U CN202223546935.9U CN202223546935U CN219696511U CN 219696511 U CN219696511 U CN 219696511U CN 202223546935 U CN202223546935 U CN 202223546935U CN 219696511 U CN219696511 U CN 219696511U
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- Prior art keywords
- formation process
- pipeline
- battery cell
- lithium battery
- electrolyte
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 33
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 23
- 239000000523 sample Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000009434 installation Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000002001 electrolyte material Substances 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to an electrolyte loss measurement device in a lithium battery formation process, which comprises: the cover body is covered on the battery core and is vacuumized; the charging-discharging and adsorbing assembly is arranged in the cover body and comprises a mounting seat, a probe and a negative pressure suction nozzle, wherein the probe and the negative pressure suction nozzle are arranged on the mounting seat, the probe is pressed with a pole of the battery cell, and the negative pressure suction nozzle is pressed with a liquid injection port of the battery cell; the collecting assembly comprises a first pipeline, a collecting bottle, a second pipeline and a vacuum pump, one end of the first pipeline is connected with the negative pressure suction nozzle, the other end of the negative pressure suction nozzle is positioned in the collecting bottle, one end of the second pipeline is positioned in the collecting bottle, and the other end of the second pipeline is connected with the vacuum pump; the collection bottle is marked with scales to measure the electrolyte loss amount collected. The method can measure the loss of the free electrolyte of the battery cell, is convenient for optimizing the formation process of the battery cell and reduces the loss of electrolyte materials in the manufacturing process of the battery cell.
Description
Technical Field
The utility model relates to the technical field of lithium battery production and processing, in particular to an electrolyte loss metering device in a lithium battery formation process.
Background
Because the lithium battery has the advantages of high energy density, small self-discharge, excellent cycle performance and the like, the lithium battery is widely applied to standby power supplies, energy storage equipment, electric automobiles, electric bicycles and electric tools. The lithium battery mainly comprises a positive electrode, a negative electrode, a diaphragm, electrolyte and a shell 5.
The formation process is an important process for activating the battery cell and forming the SEI film, and determines the electrochemical performance of the battery cell. The formation process comprises a power supply device capable of charging and discharging, a set of negative pressure control system and an electrolyte residual liquid collection system. The formation process comprises charging with a certain small-rate current, and timely pumping out gas in the battery cell in the charging process to prevent the battery cell from swelling. In the process of negative pressure exhaust of the battery cell, part of free electrolyte can be pumped away, so that the consistency of the performance of the battery cell is affected, the electrolyte is polluted, the material utilization rate of the electrolyte is lost, and therefore, the research formation process is very important for losing the liquid amount of the battery cell.
However, the existing mass production equipment cannot effectively verify the flowing and fluid loss conditions of the free electrolyte in each working step in the negative voltage formation process of the battery core, so that the formation process flow cannot be reasonably optimized, and the formation process flow comprises the vacuum target values of each working step stage, so that the vacuum target values of each working step stage cannot be optimized, and finally, the quality of the battery cannot be ensured.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the technical defect that the electrolyte loss amount in the lithium battery formation process cannot be measured in the prior art.
In order to solve the technical problems, the utility model provides an electrolyte loss metering device in a lithium battery formation process, which comprises:
the cover body is covered on the battery core, and the cover body is vacuumized;
the charging-discharging and adsorbing assembly is arranged in the cover body and comprises an installation seat, a probe and a negative pressure suction nozzle, wherein the probe and the negative pressure suction nozzle are arranged on the installation seat, the probe is pressed with a pole of the battery cell, and the negative pressure suction nozzle is pressed with a liquid injection port of the battery cell;
the collecting assembly comprises a first pipeline, a collecting bottle, a second pipeline and a vacuum pump, one end of the first pipeline is connected with the negative pressure suction nozzle, the other end of the first pipeline is positioned in the collecting bottle, one end of the second pipeline is positioned in the collecting bottle, and the other end of the second pipeline is connected with the vacuum pump;
wherein, the collecting bottle is marked with a scale to measure the collected electrolyte loss.
Preferably, the battery pack further comprises a heating assembly, wherein the heating assembly heats the ambient temperature of the battery cell.
Preferably, the heating assembly is a heat pump.
Preferably, a temperature display is arranged in the cover body.
Preferably, the lifting assembly further comprises a sliding support column, and the mounting seat is arranged on the sliding support column and can move up and down along the sliding support column.
Preferably, the first pipe is disposed obliquely downward in the electrolyte flow direction.
Preferably, the first pipeline and/or the second pipeline is/are connected with a first vacuum meter.
Preferably, a second vacuum gauge is arranged in the cover body.
Preferably, the cover is a transparent cover.
Preferably, a clamp for fixing the battery cell is further arranged in the cover body.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
1. according to the utility model, the battery cell is arranged in the cover body, and the probe is pressed with the pole of the battery cell, so that the charge and discharge operation of the battery cell is realized, and the vacuum is pumped in the cover body, so that the gas in the battery cell can be pumped out in time, and the battery cell is prevented from swelling.
2. According to the utility model, as the negative pressure suction nozzle is pressed with the liquid injection port of the battery cell, under the action of the vacuum pump, the negative pressure suction nozzle generates negative pressure, and the battery cell can collect free electrolyte in the negative pressure exhaust process, so that the liquid loss of the free electrolyte of the battery cell can be measured, the formation process of the battery cell can be optimized by measuring the liquid loss of the free electrolyte of the battery cell in each step, the loss of electrolyte materials in the battery cell manufacturing process is reduced, and the consistency of the battery cell performance is improved.
Drawings
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which
Fig. 1 is a schematic structural view of the present utility model.
Description of the specification reference numerals: 10. a base; 11. a cover body; 20. a column; 21. a mounting base; 22. a probe; 23. a negative pressure suction nozzle; 30. a first pipe; 31. a second pipe; 32. a first vacuum gauge; 33. a collection bottle; 34. a vacuum pump; 40. a battery cell; 41. a pole; 42. a liquid injection port; 50. a clamp; 60. a temperature display.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.
Referring to fig. 1, the utility model discloses an electrolyte loss metering device in a lithium battery formation process, which comprises a cover 11, a charging, discharging and adsorbing assembly and a collecting assembly.
The cover 11 is covered on the battery cell 40, and the inside of the cover 11 is vacuumized. Specifically, the cover 11 can be connected with the vacuum pump 34, and the air in the cover 11 is vacuumized through the vacuum pump 34, so that the process requirements of vacuuming in different working steps in the formation process are met.
The charge-discharge and adsorption assembly is arranged in the cover body 11, and comprises a mounting seat 21, a probe 22 and a negative pressure suction nozzle 23, wherein the probe 22 and the pole 41 of the battery cell 40 are pressed together, and the negative pressure suction nozzle 23 and the liquid injection port 42 of the battery cell 40 are pressed together. The battery cell 40 can be charged by pressing the probe 22 against the post 41 of the battery cell 40. The electrolyte residual liquid can be sucked through the pressing of the negative pressure suction nozzle 23 and the liquid injection port 42 of the battery cell 40.
The collection assembly comprises a first pipeline 30, a collection bottle 33, a second pipeline 31 and a vacuum pump 34, one end of the first pipeline 30 is connected with the negative pressure suction nozzle 23, the other end of the first pipeline 30 is located in the collection bottle 33, one end of the second pipeline 31 is located in the collection bottle 33, and the other end of the second pipeline 31 is connected with the vacuum pump 34. Wherein the collection bottle 33 is marked with a scale for metering the collected electrolyte loss.
The working principle of the utility model is as follows: firstly, the battery cell 40 is placed in the cover 11, and the probe 22 is pressed with the pole 41 of the battery cell 40, so as to realize the charge and discharge operation of the battery cell 40, and the cover 11 is vacuumized, so that the gas in the battery cell 40 can be pumped out in time, and the battery cell 40 is prevented from swelling. The negative pressure suction nozzle 23 is pressed with the liquid injection port 42 of the battery cell 40, so that the negative pressure suction nozzle 23 generates negative pressure under the action of the vacuum pump 34, and the battery cell 40 can collect the electrolyte in a free state in the negative pressure exhaust process, so that the loss of liquid of the electrolyte in a free state of the battery cell 40 can be measured. The formation process of the battery cell 40 can be optimized by metering the loss of free electrolyte from the battery cell 40 in each step.
The collection bottle 33 may be a graduated cylinder in the present utility model. The lost liquid of the electrolyte is collected and metered by a measuring cylinder.
Further, the first pipe 30 is disposed obliquely downward in the flow direction of the electrolyte, so that the electrolyte can be better collected; and the second pipe 31 is disposed obliquely upward in the flow direction of the gas, so that the probability of the electrolyte entering the second pipe 31 can be reduced. Typically, the end of the first conduit 30 within the measuring cylinder is lower than the end of the second conduit 31 within the measuring cylinder, so that electrolyte may be better collected.
The present utility model also includes a heating assembly that heats the ambient temperature of the battery cell 40. Specifically, the heating assembly can heat the ambient temperature of the battery cell 40 to different temperatures according to the process requirement, and continuously outputs heat when heating to the target temperature, so as to ensure constant temperature, and facilitate the test of the battery cell 40 at constant temperature. In an embodiment, the heating assembly is located inside the cover 11, the cover 11 is of a heat insulation type, and the heat is continuously dissipated inside the cover 11 to heat the ambient temperature of the battery cell 40; in another embodiment, the heating component is located outside the cover 11, the cover 11 is a heat-conducting cover 11, and the heat-conducting cover 11 is heated by the heating component, so as to achieve the temperature rise of the environment inside the cover 11.
Specifically, the heating component can be a heating pump or a resistance wire, and a technician can select heating components with different types and different powers according to heating requirements so as to meet test requirements. For example, in order to ensure that the temperature in the cover 11 is uniform, the heating assembly includes a plurality of resistance heating blocks, and the plurality of resistance heating blocks are uniformly arranged around the battery cell 40 circumferentially, and work is performed through the plurality of resistance heating blocks, so that a relatively uniform ambient temperature is ensured.
In order to better regulate the ambient temperature inside the housing 11, a temperature display 60 is provided inside the housing 11. Preferably, the probe of the temperature display 60 is located near the area of the battery cell 40, so that the ambient temperature can be measured more accurately.
The utility model also includes a lifting assembly comprising a sliding support column, on which the mount 21 is disposed and is capable of moving up and down along the sliding support column. Specifically, the support column can be vertically arranged, two support columns are arranged, two through holes can be vertically arranged on the mounting seat 21, and the support column is arranged in the through holes in a penetrating mode, so that the mounting seat 21 can move up and down along the support column, and the distance between the probe 22 and the negative pressure suction nozzle 23 and the battery cell 40 can be synchronously adjusted. In the use process, through gradually moving the mounting seat 21 downwards, the probe 22 and the battery cell 40 are pressed together, and the negative pressure suction nozzle 23 and the liquid injection port 42 are pressed together. Because the mounting seat 21 can move up and down, the charging, discharging and adsorbing assembly can be adapted to battery cells 40 with different specifications. For example, the lifting assembly can drive the charge-discharge and adsorption assembly to move up and down, and the battery cells 40 with different heights can be used.
In order to improve the stability of the device, the mounting seat 21 and the sliding support column are locked by bolts.
Further, a first vacuum gauge 32 is connected to the first conduit 30 and/or the second conduit 31. The amount of vacuum in the conduit can be monitored in real time by the first vacuum gauge 32. A second vacuum gauge is provided in the housing 11. A second vacuum gauge may be used to monitor the amount of vacuum within the enclosure 11.
For the convenience of observation, the cover 11 is a transparent cover 11. The cover 11 may be cylindrical, and occupies a small space.
In order to ensure that the cover 11 has better tightness, the utility model also comprises a base 10, the cover 11 is buckled on the base 10, and a rubber ring is arranged at the contact position between the cover 11 and the base 10, so that the vacuum pumping in the cover 11 can be ensured to have better tightness. Further, the cover 11 and the base 10 may also be connected by threads, for example, an external thread is provided on the cover 11, an internal thread is provided on the base 10, and the external thread is matched with the internal thread, so that the cover 11 and the base 10 are relatively fixed, and similarly, a gasket such as a rubber ring may be provided at the contact position of the cover 11 and the base 10, thereby improving the sealing effect.
A clamp 50 for fixing the battery cell 40 is also provided in the cover 11. The battery cell 40 is fixed by the clamp 50, so that the stability of the device is ensured. The fixture 50 may be designed according to requirements, and in an embodiment, the fixture 50 may include a plurality of stoppers, where the plurality of stoppers simultaneously abut against the outer surface of the battery cell 40, so as to fix the battery cell 40. In another embodiment, the fixture 50 may be provided with a profiling groove of the battery cell 40, and the battery cell 40 is placed in the profiling groove, and the battery cell 40 is fixed by the profiling groove.
The electrolyte loss metering device in the lithium battery formation process is combined for metering operation, and the method is as follows:
s1, placing a battery cell 40 of a model to be optimized into a clamp 50, sliding a mounting seat 21 downwards to a certain position, respectively pressing a probe 22 and a negative pressure suction nozzle 23 with a pole 41 and a liquid injection port 42, testing leakage rate, keeping the leakage rate at a specified target value, and fixing the mounting seat 21;
s2, covering the cover body 11, heating the inside of the cover body 11 to 45 ℃ and stabilizing for 10-20 min, and then starting the next operation;
s3, issuing an experimental process SY-1 through an upper computer, and collecting the electrolyte loss amount of the free state of each step;
s4, repeating the actions of S1-S3, and collecting fluid loss data of 5 groups of parallel samples and 3 groups of experimental groups;
s5, comparing the fluid loss data, and selecting a proper formation process flow.
According to the utility model, by manufacturing a visualized electrolyte loss measurement device in the lithium battery formation process and collecting the electrolyte loss of the free state of each working procedure, the electrolyte loss effects of various formation processes can be rapidly and conveniently compared, mass production is guided to be matched with the optimal formation process, the loss of electrolyte materials in the cell manufacturing process is reduced, and the consistency of the cell performance is improved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (10)
1. An electrolyte loss measurement device in a lithium battery formation process is characterized by comprising:
the cover body is covered on the battery core, and the cover body is vacuumized;
the charging-discharging and adsorbing assembly is arranged in the cover body and comprises an installation seat, a probe and a negative pressure suction nozzle, wherein the probe and the negative pressure suction nozzle are arranged on the installation seat, the probe is pressed with a pole of the battery cell, and the negative pressure suction nozzle is pressed with a liquid injection port of the battery cell;
the collecting assembly comprises a first pipeline, a collecting bottle, a second pipeline and a vacuum pump, one end of the first pipeline is connected with the negative pressure suction nozzle, the other end of the first pipeline is positioned in the collecting bottle, one end of the second pipeline is positioned in the collecting bottle, and the other end of the second pipeline is connected with the vacuum pump;
wherein, the collecting bottle is marked with a scale to measure the collected electrolyte loss.
2. The device for metering electrolyte loss in a lithium battery formation process according to claim 1, further comprising a heating assembly that heats the ambient temperature of the battery cells.
3. The electrolyte loss measurement device in a lithium battery formation process according to claim 2, wherein the heating component is a heat pump.
4. The device for metering electrolyte loss in a lithium battery formation process according to claim 1, wherein a temperature display is provided in the cover body.
5. The electrolyte loss measurement device in a lithium battery formation process according to claim 1, further comprising a lifting assembly, wherein the lifting assembly comprises a sliding support column, and the mounting seat is disposed on the sliding support column and can move up and down along the sliding support column.
6. The electrolyte loss measurement device in a lithium battery formation process according to claim 1, wherein the first pipe is disposed obliquely downward in the electrolyte flow direction.
7. The electrolyte loss measurement device in a lithium battery formation process according to claim 1, wherein the first pipeline and/or the second pipeline is/are connected with a first vacuum gauge.
8. The electrolyte loss measurement device in the lithium battery formation process according to claim 1, wherein a second vacuum gauge is provided in the cover body.
9. The apparatus for metering electrolyte loss in a lithium battery formation process according to claim 1, wherein the cover is a transparent cover.
10. The electrolyte loss measurement device in the lithium battery formation process according to claim 1, wherein a clamp for fixing the battery cell is further arranged in the cover body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223546935.9U CN219696511U (en) | 2022-12-29 | 2022-12-29 | Electrolyte loss metering device in lithium battery formation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223546935.9U CN219696511U (en) | 2022-12-29 | 2022-12-29 | Electrolyte loss metering device in lithium battery formation process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219696511U true CN219696511U (en) | 2023-09-15 |
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ID=87970893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223546935.9U Active CN219696511U (en) | 2022-12-29 | 2022-12-29 | Electrolyte loss metering device in lithium battery formation process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219696511U (en) |
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2022
- 2022-12-29 CN CN202223546935.9U patent/CN219696511U/en active Active
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