CN206292647U - A kind of device of controllable metal-air battery electrochemical property test atmosphere - Google Patents

Abstract

The utility model relates to a device capable of controlling the electrochemical performance testing atmosphere of a metal-air battery. The experimental device is composed of an electrochemical performance testing device and an auxiliary air intake control device. The electrochemical performance testing device is a sealed container, which is composed of a sealing flange, a cavity, a four-way valve or two two-way valves, a gas conduit, a multi-core wire, and a battery test fixture. The utility model controls the atmosphere by changing the type of liquid in the saturator, and controls the gas flow of the whole battery testing system through a four-way valve or two two-way valves. Effectively solve key problems such as gas type control, electrolyte loss, adverse effects of nitrogen and water vapor during metal-air battery testing. Adopting the test device of the present utility model can better characterize the electrochemical performance of the lithium-air battery, as measured by the device of the present utility model, the complete discharge specific capacity of the lithium-air battery is 750mAh g higher than that of a conventional and simple test device ^‑1 or so.

Description

A device capable of controlling the atmosphere for testing the electrochemical performance of metal-air batteries

technical field

The utility model relates to a device capable of controlling the atmosphere for testing the electrochemical performance of a metal-air battery, which can realize the regulation and control of the atmosphere environment of the metal-air battery by adjusting the gas flow rate, air pressure, and saturated gas type, and has excellent sealing performance. Completely avoid the influence of other components in the air on the battery performance test.

Background technique

Metal-air batteries are composed of metal negative electrodes, electrolytes, and air electrodes. Air electrodes are generally composed of carbon materials and non-carbon catalysts. Compared with other types of batteries, metal-air batteries have the advantage of higher theoretical specific energy. Taking the lithium-air battery as an example, its theoretical specific energy is as high as 11140Wh kg ^-1 , which is equivalent to that of gasoline (13000Wh kg ^-1 ). Therefore, it is very likely to replace gasoline as the power source of a new generation of vehicles.

During the electrochemical performance test of the lithium-air battery, we found that the test results using a conventional simple electrochemical performance test device (see Figure 2 in the legend) are not ideal. The main reasons are as follows: the conventional test device cannot control the electrochemical performance test atmosphere well; the air electrode of the lithium-air battery is open, and the electrolyte is easy to lose no matter whether it is tested in a flow state or a static system; -Air batteries are very sensitive to moisture and nitrogen.

In view of this, we have designed and produced a device that can control the electrochemical performance test atmosphere of metal-air batteries (see Figure 1 in the illustration) to solve the problems faced by lithium-air battery test devices. This device can also be used for Other new battery electrochemical performance tests that require controlled test atmospheres, such as other metal-air batteries.

Contents of the invention

The purpose of the utility model is to provide a device that can control the atmosphere of the metal-air battery electrochemical performance test, which can effectively control the atmosphere (gas flow and air pressure), and solve the problem of airtightness of the battery test system, water vapor and nitrogen on the test results Negative effects, electrolyte loss and other issues. A device capable of controlling the electrochemical performance test atmosphere of a metal-air battery consists of an electrochemical performance test device and an auxiliary air intake control device: the air intake control device includes a pressure reducing valve (1), a drying tube (2), Mass flow controller (3), flow meter (4), switch valve (5), pressure stabilizing valve (6), barometer (7), stabilizing valve (8), saturator (9), one-way valve ( 14); the electrochemical performance testing device is a sealed container, which consists of a sealing flange (10), a cavity (11), a four-way valve (12) or two two-way valves (13), a gas conduit ( 15), multi-core electric wire (16), battery test fixture (17).

The core of the utility model is an electrochemical performance testing device, wherein: the sealing flange (10) is connected with the cavity (11), and can be easily disassembled; the battery test fixture (17) is fixed on the sealing flange (10) through a support rod ); the battery to be tested can be easily loaded into the battery test fixture (17); the sealing flange (10) and the cavity (11) are assembled into an electrochemical performance testing device, which can be easily connected and disassembled with the air intake control device; The electrochemical performance testing device is also convenient to move in and out of the glove box; the number of battery test fixtures (17) is not limited; the control of air intake and air outlet is realized through a four-way valve (12) or two two-way valves (13) After the air intake is completed, the four-way valve (12) can be switched or the two two-way valves (13) can be closed to realize the complete sealing of the electrochemical performance testing device; the electrochemical performance test can be completed in a flowing atmosphere, or by switching the four-way valve. One-way valve (12) or two two-way valves (13) are closed to make the electrochemical performance testing device completely sealed and completed under static or quasi-static conditions; the sealing flange (10) is made of stainless steel, aluminum alloy, copper, organic glass, polytetrafluoroethylene, etc., and the material of the cavity (11) is stainless steel, aluminum alloy, copper, plexiglass, polytetrafluoroethylene, ordinary glass, quartz glass, etc.

The electrochemical performance testing device involved in the utility model can effectively solve the problems existing in conventional testing devices. For the same batch of lithium-air batteries using XC-72 as the air electrode, the preliminary test results show that the test device of the present invention can better characterize the electrochemical performance of the lithium-air battery. The obtained full discharge specific capacity is about 750mAh g ^-1 (23.7%) higher than that of the conventional and simple test device (see Figure 3 in the illustration).

Description of drawings

Fig. 1 is a device of the utility model that can control the electrochemical performance test atmosphere of a metal-air battery.

Figure 2 is a conventional simple electrochemical performance testing device.

Figure 3 is a comparison chart of the test results of the utility model and the conventional simple electrochemical performance testing device with lithium metal as the negative electrode, LiTfSI/DMSO as the electrolyte, and XC-72 carbon material as the positive electrode.

In the figure: 1 is a pressure reducing valve, 2 is a drying pipe, 3 is a mass flow controller, 4 is a flow meter, 5 is an on-off valve, 6 is a pressure stabilizing valve, 7 is an air pressure gauge, 8 is a steady flow valve, and 9 is Saturator, 10 is the sealing flange, 11 is the cavity, 12 is the four-way valve, 13 is two two-way valves, 14 is the one-way valve, 15 is the gas conduit, 16 is the multi-core wire, 17 is the battery test fixture , 201 is a three-way valve, 202 is a multi-core wire, 203 is a glass bottle, and 204 is a battery test fixture.

detailed description

As shown in Figure 1, a kind of device that can control the electrochemical performance test atmosphere of metal-air battery, described test device is made up of intake control device, electrochemical performance test device; Described intake control device comprises decompression valve ( 1), drying pipe (2), mass flow controller (3), flow meter (4), on-off valve (5), pressure stabilizing valve (6), air pressure gauge (7), stabilizing flow valve (8), saturation device (9), one-way valve (14); the electrochemical performance testing device is a sealed container, which consists of a sealing flange (10), a cavity (11), a four-way valve (12) or two two-way It consists of a through valve (13), a gas conduit (15), a multi-core electric wire (16), and a battery test fixture (17).

The cylinder gas is connected with the pressure reducing valve (1) and the drying pipe (2) to remove the influence of water, and then respectively connected with the mass flow controller (3), flow meter (4), on-off valve (5), and pressure stabilizing valve (6) ), the steady flow valve (8), and the saturator (9) are connected in sequence, and the air pressure gauge (7) is connected with the pressure steady valve (6) to form the air intake control device. Flow rate and air pressure, by changing the type of liquid contained in the saturator, to change the type of saturated gas.

Assembly of the electrochemical performance testing device: (a) the saturator (9) is connected in sequence with the four-way valve (12) or two two-way valves (13) and the one-way valve (14); (b) the four-way valve (12) Or two two-way valves (13) are fixed on the sealing flange (10) with multiple holes reserved; (c) two gas conduits (15) pass through the two perforations and the cavity on the sealing flange (10) respectively. The body is connected, wherein: one gas conduit as the air outlet just passes through the sealing flange (10), and the outlet of the other gas conduit as the intake pipe is close to the bottom of the cavity (11); (d) the battery test fixture ( 17) welded on the porous circuit board; (e) wherein two or four wires of the multi-core electric wire (16) are divided into two groups and connected with the two electrodes of the battery test fixture (17) to form the outer lead of the test electrode; (f ) The multi-core electric wire (16) passes through the remaining hole on the sealing flange (10) and is sealed with a sealant; (g) the sealing flange (10) is connected with the cavity (11) and can be easily disassembled. The entire electrochemical performance testing device is highly airtight, and the external multi-core wires are connected to the battery testing system through quick-release connectors.

Test: (a) put the battery to be tested into the battery test fixture (17); (b) connect the sealing flange (10) to the cavity (11); (c) switch the four-way valve (12) or close two two-way valves The through valve (13) keeps the system in a sealed state; (d) docking with the air intake control device; (e) after opening the switch valve (5), the gas flows through the pressure reducing valve (1), and the atmosphere is removed through the drying pipe (2) Influenced by the moisture in the medium, it flows through the mass flow controller (3), switch valve (5), pressure stabilizing valve (6), stabilizing valve (8), saturator (9), and can pass through the flow meter (4), Pressure stabilizing valve (6), stabilizing flow valve (8) to regulate gas flow and air pressure; (f) switch four-way valve (12) or open two two-way valves (13) to make gas flow through the sealed cavity (11 ), wait for a period of time to make the residual gas in the chamber (11) replaced by the target atmosphere. The electrochemical performance test can be completed under a flowing atmosphere, and can also be completed under static or quasi-static conditions by switching the four-way valve (12) or closing two two-way valves (13) so that the electrochemical performance test device is completely sealed.

An example is used to illustrate the specific implementation and advantages of the device of the present invention:

Lithium-air battery tested: with metal lithium as the negative electrode, LiTfSI/DMSO as the electrolyte, and XC-72 carbon material as the positive electrode, it was assembled into a CR-2032 button battery, and the battery shell of the positive electrode (air electrode) had multiple air vents.

Fig. 1 is a kind of device of the utility model that can control the electrochemical performance test atmosphere of the metal-air battery.

Fig. 2 is the experimental device of conventional, simple lithium-air battery electrochemical performance test, comprises three-way valve (201), multicore electric wire (202), glass bottle (203), battery test fixture (204); During the test, Put the battery to be tested into the battery test fixture (204), control the gas in and out through the three-way valve (201), and then test the battery performance.

The battery performance test was completed on the above two test devices, and the test results are shown in FIG. 3 . It can be clearly seen that for the same batch of lithium-air batteries, the full discharge specific capacity measured by the device of the present invention is about 750mAh g ^-1 (23.7%) higher than that of the conventional and simple test device, indicating that the present invention The utility model test device can better characterize the electrochemical performance of lithium-air batteries. The device can also be used for other new battery electrochemical performance tests that need to control the test atmosphere, such as other metal-air batteries.

Claims (3)

1. A device capable of controlling the electrochemical performance test atmosphere of a metal-air battery, the test device is composed of an electrochemical performance test device and an air intake control device; the air intake control device is an auxiliary device, including a pressure reducing valve ( 1), drying pipe (2), mass flow controller (3), flow meter (4), on-off valve (5), pressure stabilizing valve (6), air pressure gauge (7), stabilizing flow valve (8), saturation device (9), one-way valve (14); the electrochemical performance testing device is a sealed container, which consists of a sealing flange (10), a cavity (11), a four-way valve (12) or two two-way Composed of through valve (13), gas conduit (15), multi-core electric wire (16), and battery test fixture (17); wherein, the cylinder gas of the air intake control device is connected with the pressure reducing valve (1) and the drying pipe (2) , to remove the influence of water, and then connect to the mass flow controller (3), flow meter (4), on-off valve (5), pressure stabilizing valve (6), stabilizing valve (8) and saturator (9) in sequence , the barometer (7) is connected with the pressure stabilizing valve (6); the sealing flange (10) of the electrochemical performance testing device is connected with the cavity (11), and can be easily disassembled; the battery test fixture (17) is fixed by a support rod on the sealing flange (10); the battery to be tested can be easily loaded into the battery test fixture (17), and the electrochemical performance testing device can be easily connected and disassembled with the air intake control device; the electrochemical performance testing device is conveniently placed in the glove box Move in and out, the number of batteries that can be tested on the test fixture (17) is not limited, increasing the size of the cavity (11) can increase the number of battery test fixtures (17) it accommodates, and realize the increase in the number of test batteries. The electrochemical performance testing device can realize the control of air intake and outlet through the switch of the four-way valve (12) or two two-way valves (13); after the air intake is completed, the four-way valve (12) can be switched or the two two-way valves can be closed The valve (13) realizes the complete sealing of the electrochemical performance testing device. 2. The device capable of controlling the atmosphere for testing the electrochemical performance of metal-air batteries according to claim 1, characterized in that: the electrochemical performance test can be completed under a flowing atmosphere, or by switching the four-way valve (12) or closing the Two two-way valves (13) enable the complete sealing of the electrochemical performance testing device under static or quasi-static conditions. 3. The device capable of controlling the atmosphere for testing the electrochemical performance of metal-air batteries according to claim 1, characterized in that: the material of the sealing flange (10) is stainless steel, aluminum alloy, copper, plexiglass, polytetrafluoroethylene The cavity (11) is made of stainless steel, aluminum alloy, copper, plexiglass, polytetrafluoroethylene, ordinary glass, and quartz glass.