CN222704392U - Soft pack battery exhaust device and gas measuring device - Google Patents
Soft pack battery exhaust device and gas measuring device Download PDFInfo
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- CN222704392U CN222704392U CN202420473902.6U CN202420473902U CN222704392U CN 222704392 U CN222704392 U CN 222704392U CN 202420473902 U CN202420473902 U CN 202420473902U CN 222704392 U CN222704392 U CN 222704392U
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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
本实用新型属于电池测试领域，具体涉及一种软包电池抽气装置以及气体测量装置，包括取气针、与所述的取气针连接的导气管、以及顺序设置在所述的导气管上的抽气装置和取气袋；所述的针头与所述的抽气装置之间设置有第一阀门；所述的抽气装置与所述的取气袋之间的导气管上设置有第二阀门。该装置的设备简单，连接和操作方便，易组装、成本低，克服了气体杂质污染的缺点，产气成分测试结果准确，可实时原位观察产气，有助于产气机理分析。装置还可以重复利用，对电池的电量状态和产气状态无要求，安全可靠。
The utility model belongs to the field of battery testing, and specifically relates to a soft-pack battery exhaust device and a gas measuring device, including an exhaust needle, an air duct connected to the exhaust needle, and an exhaust device and an exhaust bag sequentially arranged on the air duct; a first valve is arranged between the needle and the exhaust device; a second valve is arranged on the air duct between the exhaust device and the air bag. The device is simple in equipment, convenient to connect and operate, easy to assemble, and low in cost. It overcomes the disadvantages of gas impurity pollution, and the test results of gas production components are accurate. Gas production can be observed in real time on-site, which is helpful for gas production mechanism analysis. The device can also be reused, has no requirements for the battery power state and gas production state, and is safe and reliable.
Description
Technical Field
The utility model belongs to the field of battery testing, and particularly relates to an air extractor for a soft package battery and a gas measuring device.
Background
Along with the development of society, the demand of people for energy is also increasing, and the demand is also increasing, and traditional energy can not meet the demand of people. In the society of information explosion of today, key components of mobile electronic products, entertainment, computers and communication devices are lithium ion secondary batteries. Compared with a metal lithium secondary battery, the safety of the lithium ion battery is greatly improved, but a plurality of hidden dangers still exist, the safety of the lithium ion battery is always a hot topic, and an important factor affecting the safety is the generation of gas, and particularly, the explosion of the battery is directly caused by the large amount of gas generated at high temperature.
Compared with a metal shell lithium ion battery, the soft package lithium ion battery has the advantages of small volume, light weight, high specific energy, flexible planning and the like, but during the use of the battery, the gas expansion of the soft package battery can negatively influence the performance and has safety risks.
The lithium ion soft package battery can generate gas in the formation, circulation and storage processes, for example SEI (Solid Electrolyte Interface) films are generated, SEI films are decomposed, the moisture content in the battery is high, lithium is separated, internal short circuit is caused, and overcharge and overdischarge are caused. The gas comes from complex reactions of various component contacts, and although the accurate analysis of a gas evolution mechanism is difficult, the gas yield and the gas production components of the soft-packed battery can be analyzed.
In the first charge and discharge process of the battery, an SEI film is formed on the surface of the electrode, the formation of the negative electrode SEI film mainly comes from the reduction decomposition of a solvent in electrolyte, and a large amount of gas is generated in the decomposition process of the electrolyte, which is an unavoidable process. The presence of moisture in the impurities can cause the decomposition of lithium salts to form HF, which can lead to instability of the battery system, affecting the electrical performance and safety of the battery. Therefore, it is important to pay attention to the gas generating components and the gas generating amount of the battery for safety analysis of the battery.
In the process of testing the gas of the soft package battery, because the aluminum-plastic shell of the soft package battery has no contractility, air can be mixed from pinholes in the process of taking the gas by the direct needle tube, so that the measurement component result is inaccurate, the tightness is poor, the gas in the soft package battery cannot be pumped out, and the gas quantity cannot be accurately measured. The adoption of some gas measuring devices for testing is complex, the requirement on the tool is high, and the operation is not convenient.
CN208270003U provides a measuring device for gas production of lithium ion soft package battery, which comprises a liquid container, an overflow liquid collecting container and a hanging device, and the gas production of the soft package battery to be measured in the formation procedure is measured by measuring the difference between the volume of liquid overflowed from the liquid container before and after formation. However, the scheme is to measure the gas yield of the soft-packed battery under the pressure of external medium liquid, and the pole piece expands and contracts during charging and discharging, so that the measurement result is inaccurate due to the drainage method, and the measurement of the gas component can not be directly performed while the gas quantity is measured.
CN101846597A samples nickel-metal hydride battery gas production, and it includes sampling needle and gas cylinder, the sampling needle is installed on the sampling mouth gas sampler self inside residual gas evacuation is not thorough enough, mixes impurity easily and influences the analysis result, and the preparation is inconvenient, owing to the corrosivity of electrolyte, the device is unfavorable reuse after the test.
CN218035225U proposes a device for detecting gas production of a soft package battery, which consists of a detection bottle, a gas collecting pipe, a vacuum pumping bottle and a pressure sensor. The device is complex and the cost is high. In the device, the gas collecting pipe stretches into the reserved gas bag of the battery to collect and test the gas, but the gas bag of the battery is generally aluminum plastic without contractility, and the gas collecting pipe cannot be inserted into the battery to avoid air leakage and introduce other gas impurities, so the patent does not solve the problem of air tightness.
Disclosure of utility model
The utility model aims to overcome the defects in the prior art and provides a soft package battery air extractor and a gas measuring device.
The utility model adopts the following technical scheme to realize the aim:
An air extractor of a soft package battery comprises an air extracting needle, an air duct connected with the air extracting needle, and an air extractor and an air extracting bag which are sequentially arranged on the air duct;
A first valve is arranged between the needle head and the air extracting device, and a second valve is arranged on the air duct between the air extracting device and the air extracting bag.
The air extractor is a piston cylinder, and the piston cylinder comprises an outer cylinder, a piston arranged in the outer cylinder and a moving rod connected with the piston.
The outer cylinder is provided with scales. The movable rod is provided with a handle.
The volume of the outer cylinder is 1-20mL.
The air taking needle penetrates into the soft package battery, and the contact part of the air taking needle and the soft package battery is provided with sealant.
The connection parts of the air duct, the air extracting device and the air extracting needle are all provided with vaseline.
The air taking bag is provided with a switch valve.
The air duct between the air taking needle and the air extracting device is provided with a connecting needle head communicated with the air duct.
A third valve is arranged between the connecting needle head and the air taking needle.
The utility model also comprises a gas measuring device which comprises the soft package battery air extracting device and a gas measuring device connected with the connecting needle head, wherein the gas measuring device is a gas chromatograph.
Compared with the prior art, the utility model has the beneficial effects that:
The application provides an air extracting device and a gas measuring device for a soft package battery, which have important significance for improving the battery formation process and improving the battery cycle performance and the safety performance. The device has the advantages of simple equipment, convenient connection and operation, easy assembly and low cost, overcomes the defect of gas impurity pollution, has accurate gas production component test result, can observe gas production in situ in real time, and is beneficial to gas production mechanism analysis. The device can be reused, has no requirement on the state of charge and the state of gas production of the battery, and is safe and reliable.
Drawings
FIG. 1 is a schematic diagram of the whole structure of an air extractor of a soft battery of the present utility model when the soft battery is left with an air pocket;
Fig. 2 is a schematic diagram of the overall structure of the air extractor of the soft-pack battery of the present utility model when the soft-pack battery has no air bag.
Detailed Description
The present utility model will be described in further detail below with reference to the drawings and preferred embodiments, so that those skilled in the art can better understand the technical solutions of the present utility model.
1-2 Show a soft package battery air extractor, comprising an air extracting needle 3, an air duct 4 connected with the air extracting needle, and an air extractor 6 and an air extracting bag 7 which are sequentially arranged on the air duct;
A first valve 5 is arranged between the air taking needle 3 and the air extracting device 6, and a second valve 10 is arranged on the air duct between the air extracting device 6 and the air taking bag 7.
The air extractor 6 is a piston cylinder, and the piston cylinder comprises an outer cylinder, a piston arranged in the outer cylinder and a moving rod connected with the piston, wherein a handle is arranged on the moving rod. The outer cylinder is provided with scales, and can be an injection syringe, and the volume of the injection syringe can be 1-20mL, specifically 1mL, 5mL, 15mL, 20mL and the like according to the gas discharge capacity of the soft package battery.
The air taking needle 3 pierces the soft-packaged battery, and the contact part of the air taking needle 3 and the soft-packaged battery 1 is provided with the sealant 2, wherein the sealant is an organosilicon high-temperature resistant sealant (a high-temperature working condition sealing adhesive formed by combining high polymer materials such as an organosilicon serving as a main body, a defoaming agent, a leveling agent, a curing agent and the like), and the sealant has the advantages of softer texture, good flexibility and good contractility, and can be well attached to an aluminum plastic shell of the soft-packaged battery, so that the sealant has better air tightness. When the gas is extracted, the gas taking needle penetrates through the sealant to be pricked into the aluminum plastic shell, and the advantage of the silica gel is utilized, so that the gas taking needle can shrink instantly, and the defects of gas leakage and gas impurity mixing are avoided.
The connection parts of the air duct 4, the air extractor 6 and the air taking needle 3 are all provided with vaseline. The air taking bag 7 is provided with a switch valve 11.
The air duct 4 between the air taking needle 3 and the air extracting device 6 is provided with a connecting needle 8 communicated with the air duct. A third valve 9 is arranged between the connecting needle head 8 and the air taking needle 3. The application also comprises a gas measuring device which comprises the soft package battery air extracting device and a gas measuring device connected with the connecting needle head, wherein the gas measuring device is a gas chromatograph.
The implementation process of the utility model specifically comprises the following steps:
1) When the soft pack battery 1 has an air bag, the use method is shown in fig. 1. Firstly, the air bag of the soft package battery is coated with sealant 2, and the interfaces of the air duct 4, the air extractor 6 and the air taking needle 3 are coated with vaseline to ensure tightness.
2) The gas in the gas taking bag is exhausted, the tightness is verified, the first valve 5 and the third valve 9 are closed, the second valve 10 is opened, and the gas in the gas taking bag 7 is exhausted by using the air exhausting device 6. When the piston in the air extraction device has rebound phenomenon, the air in the air extraction bag is considered to be evacuated, and the air extraction device is in a negative pressure state and has good air tightness. After the gas in the gas bag is taken out, the second valve 10 is closed, and at the moment, the first valve 5, the third valve 9 and the second valve 10 are all in a closed state.
3) And (5) measuring gas. The air taking needle 3 is inserted into the aluminum plastic of the soft package battery from the sealant 2, only the first valve 5 is opened, and air is taken out by the air pumping device 6. When measuring the volume, reading according to the graduation of the outer cylinder to determine the volume. If the gas amount is large, the gas cannot be pumped out at one time, the first valve 5 can be closed, the second valve 10 can be opened, the gas in the air extractor 6 is injected into the air extracting bag 7 from the air extracting bag on-off valve 11, then the second valve 10 is closed, the above operation is repeated, the outer cylinder reading is recorded, and the accumulated gas amount is calculated.
When testing gas components, the first valve 5 is opened, the gas is extracted by the air extractor 6, the connecting needle 8 is inserted into the gas measuring device, namely the gas chromatograph, the first valve 5 is closed, the third valve 9 is opened, and the gas in the air extractor is injected into the gas measuring device for direct testing.
Similarly, when the pouch-free battery is not provided with a pouch, as shown in fig. 2, a sealant is applied to the tab side, and the other is identical to the pouch-free battery.
The gas production amount and gas production composition of the battery at different stages can be measured, and the method specifically comprises the following steps:
stage 1, measuring the gas quantity and the gas composition of the battery after pre-formation, and the results are shown in table 1;
table 1 measurement table of gas amount and gas composition of battery after pre-formation
| Amount of gas | H2 | CO | CH4 | CO2 | C2H4 | C2H6 |
| 6mL | 72.66% | 4.996% | 1.73% | 0.48% | 19.16% | 0.98% |
The SEI film is formed when the battery is pre-charged for the first time, and is mainly formed by reducing and decomposing solvents such as Ethylene Carbonate (EC), high-purity diethyl carbonate (DEC) and the like in electrolyte at a negative electrode to generate an alcohol oxygen lithium compound, so that the film is formed and gas is generated simultaneously. When the first round is filled and discharged. H 2 is mainly derived from the decomposition of trace amounts of water in the cell, and CO and alkane gases are mainly derived from the reductive decomposition of solvents.
Stage 2, measurement of the gas yield and gas composition of the cell cycle failure, and the results are shown in table 2;
table 2 cell cycle failure gas yield and gas composition meter
| Amount of gas | O2 | CO | CH4 | C2H4 | C2H6 |
| 57.5mL | 1.54% | 1.76% | 88.47% | 1.11% | 8.08% |
The battery decays faster after 800 cycles and produces more gas. According to the gas production result, the failure cause can be analyzed. From the aspect of gas production, the method has no gases such as H 2、CO2 and the like, can eliminate the factors that the battery is not sealed and the gas production of the battery is not caused, and alkane gases are mainly generated by electrohydraulic decomposition, and are combined with the fact that the battery is basically free of electrohydraulic after disassembly, which indicates that the follow-up electrolyte is continuously decomposed and gas is produced possibly due to poor film formation.
Stage 3, measuring the gas yield and the gas composition of the high-temperature storage battery, wherein the results are shown in Table 3;
Table 3 measurement table for high temperature storage cell gas yield and gas composition
| Amount of gas | H2 | CO | CH4 | CO2 | C2H6 |
| 5.2mL | 33.06% | 1.55% | 0.10% | 65.18% | 0.10% |
When the battery is stored at high temperature, gas is generated, and according to the gas generation result, the battery mainly uses CO 2. Since the battery generates more CO 2 with the decomposition of the SEI film during the high temperature storage. The decomposed SEI is accompanied by regeneration, producing a small amount of alkane gas.
The results show that through the three stages, different gases are generated in the processes of formation, circulation, failure and the like of the battery, and the gas generation mechanism can be analyzed or whether the battery is abnormal or not can be judged according to the combination of the gas components and the gas quantity. The process can be improved according to the gas components and the gas quantity, the process is guided, and the electric performance and the safety performance of the battery are finally improved.
The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.
Claims (10)
1. The soft package battery air extractor is characterized by comprising an air extracting needle, an air duct connected with the air extracting needle, and an air extractor and an air extracting bag which are sequentially arranged on the air duct;
a first valve is arranged between the air taking needle and the air extracting device, and a second valve is arranged on the air duct between the air extracting device and the air taking bag.
2. The soft package battery air extractor of claim 1, wherein the air extractor is a piston cylinder, and the piston cylinder comprises an outer cylinder, a piston arranged in the outer cylinder and a moving rod connected with the piston.
3. The flexible battery air extractor of claim 2, wherein the outer cylinder is provided with graduations, and the movable rod is provided with a handle.
4. The suction device for a soft package battery according to claim 2, wherein the volume of the outer cylinder is 1-20ml.
5. The air extractor for the soft package battery according to claim 1, wherein the air extracting needle penetrates into the soft package battery, and a sealant is arranged at the contact part of the air extracting needle and the soft package battery.
6. The flexible battery air extractor of claim 1, wherein the connection between the air duct and the air extractor and the air extraction needle is provided with vaseline.
7. The suction device for the soft package battery according to claim 1, wherein the air taking bag is provided with a switch valve.
8. The flexible battery air extraction device according to claim 1, wherein a connecting needle communicated with the air guide pipe is arranged on the air guide pipe between the air extraction needle and the air extraction device.
9. The flexible battery air extractor of claim 8, wherein a third valve is disposed between said connecting needle and said air extractor.
10. The gas measuring device is characterized by comprising the soft package battery air extracting device and the gas measuring device connected with the connecting needle head, wherein the gas measuring device is a gas chromatograph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420473902.6U CN222704392U (en) | 2024-03-12 | 2024-03-12 | Soft pack battery exhaust device and gas measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420473902.6U CN222704392U (en) | 2024-03-12 | 2024-03-12 | Soft pack battery exhaust device and gas measuring device |
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| Publication Number | Publication Date |
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| CN222704392U true CN222704392U (en) | 2025-04-01 |
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| CN202420473902.6U Active CN222704392U (en) | 2024-03-12 | 2024-03-12 | Soft pack battery exhaust device and gas measuring device |
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