CN106289396B - A detection and analysis device for measuring the total gas production and gas composition inside the battery - Google Patents

Abstract

The invention relates to a detection and analysis device for measuring total gas production and gas production components in a battery. Including the survey device that is used for detecting the inside gas production of battery and the analytical equipment of the inside gas production composition of analysis battery, survey device include the box, the box link to each other with get gas device, evacuating device and gas filling device respectively, get gas device set up in battery explosion-proof valve upper end and constitute an airtight space with battery explosion-proof valve, get and press from both sides tightly through battery fastener between gas device and the battery, analytical equipment with get the gas device and link to each other. According to the technical scheme, the invention realizes the quantitative and qualitative simultaneous monitoring of the total gas production quantity in the battery, so that the designed battery is safer, and has the advantages of simple structure and simple and convenient operation.

Description

A detection and analysis device for measuring the total gas production and gas composition inside the battery

technical field

The invention relates to a detection and analysis device for measuring the total gas production inside a battery and the components of the gas production.

Background technique

Due to the anisotropic characteristics of the square aluminum case, compared with the isotropic cylindrical battery, the square aluminum case battery is easier to deform under the same air pressure. After a long-term high-temperature cycle or over-discharge, the square aluminum shell battery is prone to severe flatulence. When the air pressure reaches a certain level, the battery shell will rupture and the electrolyte will flow out, causing safety accidents. The gas volume and composition can optimize the battery material system and match the electrolyte, and design a battery structure that can withstand greater pressure and find a better aluminum shell material. Most of the existing detection devices for internal gas production in lithium-ion batteries can only take out part of the gas inside the battery for component analysis, but cannot quantify the volume of compressed gas inside the battery. For example: CN202661451U combines a gas pressure measuring device, a gas temperature measuring device and a gas component analysis device to perform qualitative analysis of the gas inside the battery; CN101598641A uses a set of battery fixtures and a piercing sampler to collect and analyze a small amount of gas inside the battery.

Contents of the invention

The object of the present invention is to provide a detection and analysis device for measuring the total gas production and gas components inside the battery. The detection and analysis device can realize the simultaneous quantitative and qualitative monitoring of the total gas production inside the battery, and is easy to operate and easy to use.

In order to achieve the above object, the present invention adopts the following technical solutions: it includes a measuring device for detecting the gas production inside the battery and an analysis device for analyzing the gas production components inside the battery, the measuring device includes a box, and the boxes are respectively It is connected with the gas extraction device, the vacuum device and the gas filling device. The gas extraction device is arranged on the upper end of the explosion-proof valve of the battery and forms a closed space with the explosion-proof valve of the battery. The gas extraction device and the battery are fastened by the battery The device is clamped, and the analysis device is connected with the gas sampling device.

The air-taking device as a whole has a closed square cavity structure, consisting of a hollow body with a square cross section, a top plate connected to the upper part of the hollow body, and a bottom plate connected to the lower part of the hollow body. There is also a gap between the hollow body and the top plate. There is a rubber sheet that seals the two, and an airtight space is formed between the top plate, the rubber sheet, the hollow body and the bottom plate, and a first round hole with a diameter larger than the diameter of the battery explosion-proof valve is opened on the bottom plate. A second circular hole is opened at the center of the top plate, and the first circular hole and the second circular hole coincide with the axis of the battery explosion-proof valve.

An annular rubber plug is provided between the bottom plate and the battery explosion-proof valve to seal the two. The inner diameter of the rubber plug is larger than the diameter of the first round hole, and the rubber plug coincides with the axis of the battery explosion-proof valve.

The hollow body is surrounded by four vertical plates perpendicular to the bottom plate, and the box is connected to the hollow body through a third air pipe.

The top plate is a stainless steel top plate.

The battery fastening device includes a base for placing the battery and a screw post fixed on the base, and the bottom plate and the screw post are fastened by screws.

The analysis device includes a pointed needle tube that passes through the second round hole and the rubber sheet and communicates with the hollow body. The pointed needle tube is connected with the gas chromatograph through a flexible pipe, and the flexible pipe is provided with first valve and the second valve.

The distance between the first valve and the second valve is 3-6mm.

The vacuum pumping device includes a vacuum pump connected to the box through a first air pipe, and the first air pipe is provided with a vacuum pressure gauge and a third valve in sequence.

The gas filling device includes a gas cylinder connected to the box through a second gas pipe, the second gas pipe is provided with a flow control valve, and the gas in the gas cylinder is nitrogen, argon, hydrogen or helium. kind of.

It can be seen from the above technical solution that the present invention realizes simultaneous quantitative and qualitative monitoring of the total gas production inside the battery, making the designed battery safer, and at the same time has the advantages of simple structure and easy operation.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is an exploded view of Fig. 1 .

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1 and Figure 2, a detection and analysis device for measuring the total gas production and gas components inside the battery, including a measuring device for detecting the internal gas production of the battery and an analysis device for analyzing the gas components inside the battery, the measuring device It includes a box body 1, the box body 1 is respectively connected with the gas extraction device 2, the vacuum device 3 and the gas filling device 4, the gas extraction device 2 is arranged on the upper end of the battery explosion-proof valve and forms a closed space with the battery explosion-proof valve, the gas extraction device 2 The battery 10 is clamped by the battery fastening device 5 , and the analysis device 6 is connected with the gas sampling device 2 .

Further, the air-taking device 2 has a closed square cavity structure as a whole, consisting of a hollow body 21 with a square cross section, a top plate 22 connected to the upper part of the hollow body 21, and a bottom plate 23 connected to the lower part of the hollow body 21. The hollow body 21 and There is also a rubber sheet 24 that seals the two between the top plates 22. A closed space is formed between the top plate 22, the rubber sheet 24, the hollow body 21 and the bottom plate 23. The bottom plate 23 is provided with a first circle with a diameter greater than that of the battery explosion-proof valve. hole, the center of the top plate 22 is provided with a second round hole 221, and the first round hole and the second round hole 221 coincide with the axis of the battery explosion-proof valve,

Further, an annular rubber plug 7 is provided between the bottom plate 23 and the battery explosion-proof valve to seal the two. The inner diameter of the rubber plug 7 is larger than the diameter of the first circular hole, and the rubber plug 7 coincides with the axis of the battery explosion-proof valve. That is, the outer diameter of the rubber plug is sequentially larger than the inner diameter of the rubber plug, the diameter of the first circular hole, and the diameter of the battery explosion-proof valve. Preferably, the rubber stopper 7 is a hollow structure.

Furthermore, the hollow body 21 is surrounded by four vertical plates perpendicular to the bottom plate 23 , and the box body 1 is connected to the hollow body 21 through the third air pipe 11 .

Further, the top plate 22 is a stainless steel top plate.

Further, the battery fastening device 5 includes a base 51 for placing the battery 10 and a screw post 52 fixed on the base 51 , and the bottom plate 23 and the screw post 52 are fastened by screws 53 . Specifically, there is a groove for placing the battery 10 inside the base 51 , and screw columns 52 are symmetrically arranged on both sides of the groove.

Further, the analysis device 6 includes a pointed needle tube 61 that passes through the second round hole 221 and the rubber sheet 24 to communicate with the hollow body 21. The pointed needle tube 61 is connected to the gas chromatograph through a flexible pipe 62, and the flexible pipe 62 is provided with The first valve 63 and the second valve 64 .

Preferably, the distance between the first valve 63 and the second valve 64 is 3-6 mm.

Further, the vacuum device 3 includes a vacuum pump 32 connected to the box body 1 through a first air pipe 31 , and the first air pipe 31 is provided with a vacuum pressure gauge 33 and a third valve 34 in sequence.

Further, the gas filling device 4 includes a gas cylinder 42 connected to the box body 1 through a second gas pipe 41, the second gas pipe 41 is provided with a flow control valve 43, and the gas in the gas cylinder 42 is nitrogen, argon, hydrogen or helium One of a kind. The flow control valve 43 can precisely control the injection flow rate and time, and then control the injection volume.

Operating principle and working process of the present invention are as follows:

When the present invention is assembled, first take a bulging ternary square aluminum shell battery 10, place the battery 10 in the groove in the base 51, and install the battery 10, the rubber plug 7 and the gas-taking device through the cooperation of the screw column and the screw. 2. Fasten the connection, then respectively connect the box body 1 with the vacuum device 3 and the gas filling device 4, connect the analysis device 6, the box body 1 with the gas extraction device 2, at this time, the box body 1, the gas extraction device 2, The vacuum device 3, the gas filling device 4, and the analysis device 6 form a sealed space.

When working, first close the second valve 64 in the analysis device 6, open the first valve 63, and the pointed needle tube 61 passes through the second round hole 221 at the top plate 22 and pierces the rubber sheet 24, but does not contact the battery, ensuring that the entire device in a closed state. Open the third valve 34, and use the vacuum pump 32 to vacuumize the entire device. When the vacuum pressure gauge 33 shows -1, close the third valve 34. At this time, press the pointed needle tube 61 to puncture the explosion-proof valve of the battery. Then pull out the battery quickly, but the pointed needle tube 61 remains inside the rubber sheet 24. At this time, the gas inside the battery 10 will automatically enter the closed space through the air pressure, and flow to the air extraction device 2 (volume V1) and the box. 1 (volume V2); at this time, the degree of the vacuum pressure gauge 33 is -0.5KPa, and the flow rate v and time t of hydrogen can be precisely controlled through the flow control valve 43, and it will be closed when the reading of the vacuum pressure gauge 33 shows 0 Gas cylinder 42, at this time, the hydrogen injection volume is V3=v*t, then the gas volume inside the battery is V=V1+V2-V3; then the first valve 63 is closed, then the first valve 63 and the second valve The gas pipes between 64 stores part of the gas inside the battery, and the gas inside the battery can be qualitatively analyzed by connecting to a gas chromatograph.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (10)

1. A detection and analysis device for measuring the total gas production inside the battery and the gas production components, characterized in that: it includes a measuring device for detecting the internal gas production of the battery and an analysis device for analyzing the gas production components inside the battery, the measuring device It includes a box body (1), the box body (1) is respectively connected with the gas extraction device (2), the vacuum device (3) and the gas filling device (4), and the gas extraction device (2) is set in The upper end of the battery explosion-proof valve forms a closed space with the battery explosion-proof valve. The gas extraction device (2) and the battery (10) are clamped by the battery fastening device (5). The analysis device (6) and the battery (10) are clamped together. The gas-taking device (2) is connected. 2. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 1, characterized in that: the gas extraction device (2) has a closed square cavity structure as a whole, and the cross section is square The hollow main body (21), the top plate (22) connected to the upper part of the hollow main body (21) and the bottom plate (23) connected to the lower part of the hollow main body (21), the hollow main body (21) and the top plate (22) There is also a rubber sheet (24) for sealing the two, and an airtight space is formed between the top plate (22), the rubber sheet (24), the hollow body (21) and the bottom plate (23), and the bottom plate ( 23) There is a first round hole with a diameter larger than the diameter of the battery explosion-proof valve, and a second round hole (221) is opened at the center of the top plate (22), and the first round hole, the second round hole (221) and The axes of the battery explosion-proof valve coincide with each other. 3. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 2, characterized in that: between the bottom plate (23) and the explosion-proof valve of the battery, there is an annular rubber that seals the two A plug (7), the inner diameter of the rubber plug (7) is larger than the diameter of the first circular hole, and the rubber plug (7) coincides with the axis of the battery explosion-proof valve. 4. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 2, characterized in that: the hollow body (21) is surrounded by four vertical plates perpendicular to the bottom plate (23) The box body (1) is connected with the hollow body (21) through the third air pipe (11). 5. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 2, characterized in that: the top plate (22) is a stainless steel top plate. 6. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 2, characterized in that: the battery fastening device (5) includes a base (51) for placing the battery (10) ) and the screw post (52) fixed on the base (51), the bottom plate (23) and the screw post (52) are fastened by screws (53). 7. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 2, characterized in that: the analysis device (6) includes a second round hole (221) and a rubber sheet ( 24) A pointed needle tube (61) communicated with the hollow body (21), the pointed needle tube (61) is connected to the gas chromatograph through a flexible tube (62), and the flexible tube (62) is provided with The first valve (63) and the second valve (64). 8. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 7, characterized in that the distance between the first valve (63) and the second valve (64) is 3 ~6mm. 9. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 1, characterized in that: the vacuum pumping device (3) includes the first air pipe (31) and the box (1 ) connected to the vacuum pump (32), the first air pipe (31) is provided with a vacuum pressure gauge (33) and a third valve (34) in sequence. 10. The detection and analysis device for measuring the total gas production and gas components inside the battery according to claim 1, characterized in that: the gas filling device (4) includes the second air pipe (41) and the box (1 ) connected to the gas cylinder (42), the second gas pipe (41) is provided with a flow control valve (43), and the gas in the gas cylinder (42) is nitrogen, argon, hydrogen or helium A sort of.