CN204461695U - A kind of feeder and lithium battery leak detection system - Google Patents

Abstract

The utility model relates to a kind of feeder and lithium battery leak detection system, belongs to technical field of lithium batteries.Lithium battery leak detection system comprises the mixing gas circuit be connected with lithium battery to be measured with feeder, mixing gas circuit is connected with the first branch road and the second branch road, and on the first branch road, string is provided with and shows leaking source, and on the second branch road, string is provided with dry air source of the gas.Lithium battery leak detection system feeder of the present utility model can provide the mixed gas of probe gas and dry air for lithium battery to be measured, saves the use amount of probe gas, saves leak detection cost on the whole.

Description

A gas supply device and a lithium battery leak detection system

technical field

The utility model relates to a gas supply device and a lithium battery leakage detection system, belonging to the technical field of lithium batteries.

Background technique

Lithium batteries have good development prospects due to their high working voltage, high energy density, long service life, green and pollution-free. With the rapid development of the new energy industry, especially the rapid development of electric vehicles, the safety of lithium batteries has been raised higher requirement. Due to the use of lithium-containing electrode materials in lithium batteries, this lithium-containing material will cause its performance to deteriorate sharply and even explode when it encounters oxygen and water vapor in the air. Therefore, from a safety point of view, the airtightness of lithium batteries is very important.

In actual production, taking the lithium-ion battery with a metal shell as an example, the shell and the cover plate are welded together by laser welding. This welding method is fast, efficient, and high in reliability. Because of the body, cover plate, welding equipment and tooling, welding process, etc., there may be a small amount of false welding or air holes. For this part of the battery, it is necessary to quickly and accurately detect and select it to avoid safety problems.

Due to the high requirements for leakage detection of lithium batteries, batteries with slight leakage need to be detected accurately, so it is necessary to use very high-precision detection equipment. In the prior art, mass spectrometer leak detection equipment is usually used for high-precision leak detection of batteries. The mass spectrometer leak detection equipment generally includes a closed container or chamber for placing the battery to be tested, and a helium mass spectrometer connected to the closed container or chamber. , the battery to be tested is in communication with the gas source that provides the leak gas, and the leak gas is generally helium. A similar helium mass spectrometer leak detection system is disclosed in "Testing Method for Sealing Performance of Ni-MH Batteries for Space Use" (Power Technology, Zhao Hongwei et al., 2010 (10), 1046-1048). However, the helium mass spectrometer leak detection equipment in the prior art uses pure helium. In order to allow helium to overflow from the battery case, it is necessary to ensure that the air pressure in the battery case reaches a certain value, which greatly improves the use of helium. amount, while the cost of helium is higher, thus increasing the overall cost of leak detection. Moreover, in the actual production of lithium batteries, in many cases, it is necessary to regulate the flow rate of the leakage gas, so as to be suitable for the leak detection needs of batteries of different types and sizes.

Utility model content

The purpose of the utility model is to provide a gas supply device for a lithium battery leakage detection system that can reduce the amount of leakage gas used.

The purpose of the utility model is also to provide a lithium battery leakage detection system.

In order to achieve the above object, the technical scheme of the gas supply device for the lithium battery leakage detection system of the present invention is as follows:

A gas supply device for a lithium battery leak detection system, including a mixed gas circuit connected to the lithium battery to be tested, a first branch circuit and a second branch circuit connected to the mixed gas circuit, and a leakage gas source is arranged in series on the first branch circuit , a dry air source is provided in series on the second branch.

A mixed gas pressure gauge for detecting the pressure of the mixed gas in the mixed gas path is arranged on the mixed gas path.

An air pressure gauge for detecting the dry air pressure in the second branch is arranged on the second branch.

The gas mixing circuit includes a gas mixing chamber, and both the first branch and the second branch are connected to the gas mixing chamber.

The leak-indicating gas source is a helium gas source or an argon gas source.

The technical scheme of the lithium battery leakage detection system of the present utility model is as follows:

A lithium battery leak detection system, including a closed container for placing the lithium battery to be tested and a gas supply device, the gas supply device includes a mixed gas circuit connected to the lithium battery to be tested, and a first branch is connected to the mixed gas circuit And the second branch, the first branch is provided with a leakage gas source, and the second branch is provided with a dry air source.

A mixed gas pressure gauge for detecting the pressure of the mixed gas in the mixed gas path is arranged on the mixed gas path.

An air pressure gauge for detecting the dry air pressure in the second branch is arranged on the second branch.

The gas mixing circuit includes a gas mixing chamber, and both the first branch and the second branch are connected to the gas mixing chamber.

A mass spectrometer is connected to the airtight container.

A helium throttling valve is arranged on the first branch, and an air throttling valve is arranged on the second branch.

The leak-indicating gas source is a helium gas source or an argon gas source.

The utility model can provide the mixed gas of leakage gas and dry air for the lithium battery to be tested by setting the gas supply device for the lithium battery leakage detection system, which can be connected with the leakage gas source and the dry air source at the same time, and the dry air can provide certain The pressure makes it easier for the leaking gas to escape from the lithium battery to be tested, which saves the amount of helium used as the leaking gas, saves gas costs, and saves the cost of leak detection as a whole.

Further, the utility model is equipped with a mixed gas pressure gauge on the mixed gas path, which can adjust the flow rate of the mixed gas entering the lithium battery to be tested according to the pressure of the mixed gas, so that the lithium battery leakage detection system of the utility model can be applied to different models, The detection of the size of the battery.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of a lithium battery leakage detection system of the present invention.

detailed description

Embodiments of the lithium battery leakage detection system of the present utility model:

As shown in Figure 1, the lithium battery leakage detection system of the present utility model includes a closed container 15 for placing the lithium battery 16 to be tested, a helium mass spectrometer 18 communicated with the closed container 15, and a helium mass spectrometer 18 communicated with the lithium battery 16 to be tested and A gas supply device capable of charging gas into the battery to be tested, the gas supply device includes a mixed gas path connected to the lithium battery to be tested, the mixed gas path is connected with a first branch and a second branch, the first branch It is connected to the leak-indicating gas source, and the second branch is connected to the dry air source. The mixed gas circuit includes the gas used to mix the leak-indicating gas provided by the first branch and the dry air provided by the second branch. Mixing chamber 8, after the leakage gas and dry air are mixed in the gas mixing chamber, the lithium battery to be tested is charged through the first gas pipe 14 connected between the lithium battery to be tested and the gas mixing chamber, and the first gas pipe is connected to the lithium battery to be tested. The connection with the gas mixing chamber is sealed, and the first gas pipe passes through the wall of the airtight container and is also sealed to prevent gas leakage. A mixed gas pressure gauge 13 for monitoring the pressure of the mixed gas is connected to the pipeline where the first gas pipe is located between the gas mixing chamber and the airtight container. The helium mass spectrometer is airtightly connected with the airtight container through the second air pipe 19, and a helium detection head 17 for detecting helium is arranged on the pipeline of the second air pipe.

In this embodiment, the gas source for leak detection is a helium gas source 12, which is sealed and connected to the gas mixing chamber through the third gas pipe 11, and a helium throttling for controlling the flow rate of helium is provided on the third gas pipe 11 The valve 9, the helium flowmeter 10, the third gas pipe, the helium throttle valve and the helium flowmeter together constitute the first branch.

The dry air source includes an air compressor 1, a filter 2 connected to the air compressor, an air storage tank 3 connected to the filter, the filter 2 can filter the air compressed by the air compressor, and the air storage tank 3 Can store the filtered air. The dry air source is sealed and connected to the gas mixing chamber through the fourth air pipe 4, and the pipeline of the fourth air pipe is connected with an air flow meter 5, an air throttle valve 6 for controlling the air flow, and an air pressure gauge 7 in sequence, wherein the air pressure Table 7 is connected to the gas mixing chamber. The fourth air pipe, the air flow meter, the air throttle valve and the air pressure gauge together constitute the second branch.

When the above-mentioned embodiment is in use, the compressed air produced in the air compressor is stored in the air storage tank after being filtered, and the flow rate of the air entering the gas mixing chamber is adjusted through the air throttling valve. The air flow meter and the air pressure gauge can be used to To monitor the flow of air entering the gas mixing chamber and the pressure generated, the helium throttle valve can adjust the flow of helium entering the gas mixing chamber, and the helium flowmeter is used to monitor the flow of helium. Through the adjustment of the helium throttle valve and the air throttle valve, the proportion of each gas in the gas mixing chamber can be adjusted at will to meet the needs of different detection accuracy and save costs. The mixed gas pressure gauge can monitor the pressure of the mixed gas entering the battery to be tested. According to the pressure, the amount of gas entering the mixed gas chamber can be adjusted to control the flow of gas entering the battery to be tested to meet the testing needs of batteries of different sizes.

In other embodiments of the lithium battery leak detection system of the present invention, a helium throttle valve and a helium flowmeter are arranged on the pipeline connecting the helium gas source and the gas mixing chamber, and a helium gas flow meter is installed on the pipeline connecting the dry air source and the gas mixing chamber There is no air throttle valve and air flow meter, and the ratio of each gas in the mixed gas chamber is adjusted only by controlling the flow of helium. Of course, the helium flowmeter can also be further omitted, and only the helium throttle valve is kept.

In other embodiments, an air throttling valve, an air flow meter and an air pressure gauge are arranged on the connecting pipeline between the dry air source and the mixed gas chamber, while no helium throttling is set on the connecting pipeline between the helium gas source and the mixed gas chamber Valve and helium flow meter, only by controlling the flow of dry air to adjust the ratio of each gas in the mixed gas chamber. Of course, the air flow meter or the air pressure gauge can also be further omitted.

In other embodiments, the dry air source may be replaced by a dry air storage device, and the dry air storage device stores dry air which is suitable for mixing with helium and used as leak detection gas.

In other embodiments, the leak detection gas source is argon gas source.

The embodiment of the gas supply device for the lithium battery leakage detection system of the utility model is completely consistent with the structure of the gas supply device in the above embodiment of the lithium battery leakage detection system, and will not be repeated here. In addition, the alternatives of the various gas supply devices in the above embodiments of the lithium battery leakage detection system are also applicable to the embodiment of the gas supply device for the lithium battery leakage detection system of the present invention.

Claims (10)

1. A gas supply device for a lithium battery leak detection system, characterized in that: it includes a mixed gas path connected to the lithium battery to be tested, the mixed gas path is connected with a first branch and a second branch, and the first branch is connected in series There is an air source for indicating leakage, and a dry air source is provided in series on the second branch. 2. The gas supply device for lithium battery leakage detection system according to claim 1, characterized in that: the mixed gas path is provided with a mixed gas pressure gauge (13) for detecting the pressure of the mixed gas in the mixed gas path. 3. The air supply device for lithium battery leakage detection system according to claim 1, characterized in that: an air pressure gauge (7) for detecting the dry air pressure in the second branch is arranged on the second branch. 4. The gas supply device for lithium battery leakage detection system according to claim 1, characterized in that: the mixed gas path includes a gas mixing chamber (8), and the first branch and the second branch are connected to the on the gas mixing chamber. 5. A lithium battery leak detection system, comprising an airtight container (15) and an air supply device for placing the lithium battery to be tested, characterized in that the gas supply device includes a mixed gas path connected to the lithium battery to be tested, The mixed gas path is connected with a first branch and a second branch, the first branch is provided with a leak-indicating gas source in series, and the second branch is provided with a dry air source in series. 6 . The lithium battery leakage detection system according to claim 5 , wherein a mixed gas pressure gauge ( 13 ) for detecting the pressure of the mixed gas in the mixed gas path is arranged on the mixed gas path. 7. The lithium battery leakage detection system according to claim 5, characterized in that an air pressure gauge (7) for detecting dry air pressure in the second branch is arranged on the second branch. 8. The lithium battery leak detection system according to claim 5, wherein the mixed gas circuit comprises a gas mixing chamber (8), and the first branch and the second branch are both connected to the gas mixing chamber . 9. The lithium battery leakage detection system according to claim 5, characterized in that, a mass spectrometer (18) is connected to the airtight container. 10. The lithium battery leak detection system according to claim 5, characterized in that a helium throttle valve (9) is provided on the first branch, and an air throttle valve (6) is provided on the second branch .