Device for detecting gas production rate of core package

Abstract

The utility model discloses a device for detecting the gas production rate of a core package, which comprises a core package placing box and a graduated tube, the core package placing box comprises a tank body, a cover and a lead, electrolyte is contained in the core package placing box, and the graduated tube is higher than the core package placing box. The device for detecting the gas production rate of the core package provided by the utility model is better in leakproofness, improves the accuracy of detection data, is safe to operate, can prevent the connection part of the clamp and the lead from being corroded to cause power failure of the device, and avoids the failure of the core package.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitor production, in particular to a device for detecting the gas production of a core package. Background Art

[0002] Aluminum electrolytic capacitors are prone to "bulging" during use. This is mainly because when the aluminum electrolytic capacitor is subjected to surge current or voltage shock during use, the oxide film on the anode aluminum foil of the electrolytic capacitor is damaged. At this time, the aluminum in the aluminum foil is directly exposed to the electrolyte, and the electrolyte contains water. Therefore, in the damaged part of the anodized film, the water in the electrolyte and the anode foil (Al) will undergo the following chemical reaction for repair: 4Al+6H2O→2Al2O3+6H2↑. After the repair, the anode aluminum foil will be covered with a layer of oxide film again, and hydrogen will be generated inside the capacitor. When the hydrogen reaches a certain amount, it will cause the capacitor to bulge. The amount of gas generated by the capacitor is related to the performance of the formed foil. The better the performance of the formed foil, the less gas is generated, and the worse the performance of the formed foil, the more gas is generated. Most of the current detection devices do not consider the impact of the volatilization amount on the experiment, the detection data is not accurate, and it is not convenient to use. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and proposes a device for measuring the gas production of a core package, which can achieve rapid and accurate measurement of the gas production of the core package and can characterize the performance of the formed foil under different processes according to the gas production.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a device for detecting the gas production of a core package, comprising a core package placement box and a calibrated tube;

[0005] The core package placement box comprises a tank body, a cover, and a conductor, and the tank body contains electrolyte;

[0006] The graduated tube is higher than the core package placement box; the graduated tube is located at the side of the tank body and forms a "U"-shaped communicating vessel with the tank body.

[0007] In a specific embodiment of the present application, the tank body is made of stainless steel, and the lid is made of stainless steel.

[0008] In a specific embodiment of the present application, a liquid level scale is set in the tank body, and during the gas production measurement process, the liquid level of the electrolyte in the tank body is not higher than the liquid level scale.

[0009] In a specific embodiment of the present application, a sealing ring is provided between the can body and the lid so that the can body and the lid are tightly connected. Preferably, the can body and the lid are tightly connected via threads.

[0010] In a specific embodiment of the present application, the cover includes a wire hole and an explosion-proof valve, and a sealing gasket is arranged outside the wire hole. The explosion-proof valve can protect the device, and when the internal pressure of the device is high, the explosion-proof valve automatically discharges gas; the sealing gasket is made of polytetrafluoroethylene to increase the sealing performance of the device.

[0011] In a specific embodiment of the present application, the wire passes through the wire hole, and a clamp is arranged at the lower end of the wire, and the clamp is used to clamp the lead wire of the core package. Thus, it is more convenient to replace the test core package.

[0012] In a specific embodiment of the present application, the lead connection portion between the clamp and the core package is always kept away from the electrolyte, thereby preventing the connection portion from being corroded by the electrolyte and causing the core package to fail, further protecting the core package.

[0013] In a specific embodiment of the present application, a valve is provided on the "U"-shaped communicating vessel, and the valve controls the communication between the core package placement box and the calibrated tube.

[0014] In a specific embodiment of the present application, a detachable sealing cover is provided at the top of the graduated tube, wherein the detachable sealing cover at the top of the graduated tube can reduce the volatilization of the electrolyte in the graduated tube during testing.

[0015] In a specific embodiment of the present application, a sealing ring is provided at the connection between the graduated tube and the tank body, so that the graduated tube and the tank body are tightly connected. Preferably, the graduated tube and the tank body are tightly connected via threads.

[0016] In a specific embodiment of the present application, the calibrated tube is made of a transparent, high temperature resistant material, and a side wall of the calibrated tube is provided with graduations. Preferably, the transparent, high temperature resistant material is glass or quartz.

[0017] In a specific embodiment of the present application, the core pack is an aluminum electrolytic capacitor core pack, or a lithium battery core pack, and the core pack must always be in full contact with the electrolyte.

[0018] The beneficial effects of the utility model include:

[0019] The utility model provides a device for detecting the gas production of a core package. The device mainly comprises a core package placement box and a calibrated tube, which are tightly connected to form a "U"-shaped communicating vessel. A valve is installed on the "U"-shaped communicating vessel. The valve is closed during detection and opened during data measurement. The liquid level of the calibrated tube will move up, and the valve can ensure that there is no gas leakage during the experiment. A detachable sealing cover is arranged on the top of the calibrated tube to put the entire measuring device in a closed state, reduce the volatilization of the electrolyte in the calibrated tube, make the device more airtight, improve the accuracy of the detection data, and ensure safe operation. Moreover, the connection between the clamp and the lead wire does not contact the electrolyte, which can protect the connection from being corroded to cause the device to be powered off, thereby avoiding failure of the core package. The better the reaction between the formed foil and the electrolyte, the more compatible they are, the better the quality of the oxide film, the better the performance, the fewer parts that need to be repaired, and the less gas generated; on the contrary, the worse the reaction between the formed foil and the electrolyte, the less compatible they are, the worse the quality of the oxide film, the worse the performance, the more parts that need to be repaired, and the more gas generated. This device can be used to quickly judge the performance of different formed foils, shorten the time for later performance testing of the formed foil, and judge the degree of coordination between the formed foil and the electrolyte; in addition, general devices that can produce gas can be tested using this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a device for detecting gas production of a battery cell provided in Example 1;

[0021] Figure 2 Schematic diagram of the stainless steel lid provided in Example 1.

[0022] Description of Figure Numbers:

[0023] 1. Core package placement box; 10. Cover; 100. Wire; 101. Clamp; 102. Wire hole; 103. Sealing gasket; 104. Explosion-proof valve; 11. Tank; 110. Liquid level scale; 111. Electrolyte; 2. Scale tube; 20. Sealing cover; 21. Scale; 3. Core package; 30. Lead wire; 4. Valve. DETAILED DESCRIPTION

[0024] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. The described embodiments are only part of the embodiments of the present invention, not all of them. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not used to limit the present invention.

[0025] Example 1

[0026] Implementation method:

[0027] Before the experiment: place the core package 3 in the core package placement box 1, and connect the lead 30 of the core package 3 to the clamp 101. Open the valve 4 and the sealing cover 20, and inject the electrolyte 111 into the core package placement box 1. The liquid level of the electrolyte 111 is lower than the liquid level scale 110. Note that the liquid levels of the electrolyte 111 in the core package placement box 1 and the scale tube 2 are consistent at this time. Record the scale of the scale tube 2 at this time as "a", then close the valve 4 and cover the sealing cover 20.

[0028] During the experiment: the lead 100 extending from the cover 10 is connected to the power supply and powered on to put the core package 3 in a load state or a storage state. At the same time, in order to reduce the interference of the volatilization of the electrolyte on the experimental results, a blank control sample that is not in a load state or a storage state is also set in this experiment to measure the volatilization of the electrolyte of the detection device.

[0029] After the experiment: the working state is terminated, and the experimental equipment is allowed to cool naturally. Since the chemical reaction inside the core package 3 produces gas, the core package 3 produces a "bulging" phenomenon, resulting in a relatively high atmospheric pressure inside the core package placement box 1. At this time, the sealing cover 20 is removed and the valve 4 is opened. Since the pressure inside the graduated tube 2 is lower than the pressure inside the core package placement box 1, the liquid level in the graduated tube 2 rises. The scale of the graduated tube 2 at this time is recorded as "b", and the scale of the blank control sample is recorded as "c".

[0030] The scale change value of the experimental group is "ba"

[0031] The electrolyte volatilization amount of the blank group is "ac"

[0032] The gas production is "the scale change value of the experimental group - the volatilization amount of the electrolyte in the blank group", that is, "ba-(ac)" = "b-2a+c".

[0033] The above is only used to illustrate the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A device for detecting the gas production of a core package, characterized in that: The device comprises: a core package placement box and a calibrated tube; The core package placement box comprises a tank body, a cover, and a conductor, and the tank body contains electrolyte; The graduated tube is higher than the core package placement box; the graduated tube is located on the side of the tank body and forms a "U"-shaped communicating vessel with the tank body.

2. The device for detecting the gas production of the core package according to claim 1, characterized in that: A liquid level scale is arranged in the tank body, and during the process of measuring gas production, the liquid level of the electrolyte in the tank body is not higher than the liquid level scale.

3. The device for detecting the gas production of the core package according to claim 1, characterized in that: A sealing ring is arranged between the tank body and the cover so that the tank body and the cover are tightly connected.

4. The device for detecting the gas production of the core package according to claim 1, characterized in that: The cover comprises a wire hole and an explosion-proof valve, a sealing pad is arranged outside the wire hole, and the wire hole passes through the cover.

5. The device for detecting the gas production of the core package according to claim 1, characterized in that: The wire passes through the wire hole, and a clamp is arranged at the lower end of the wire, and the clamp is used to clamp the lead wire of the core package.

6. The device for detecting the gas production of the core package according to claim 5, characterized in that: The lead connection portion between the clamp and the core package is always out of contact with the electrolyte.

7. The device for detecting the gas production of the core package according to claim 1, characterized in that: The "U"-shaped communicating vessel is provided with a valve, and the valve controls the communication between the core package placement box and the calibrated tube.

8. The device for detecting the gas production of the core package according to claim 1, characterized in that: A detachable sealing cover is provided at the top of the graduated tube; A sealing ring is arranged at the connection between the graduated tube and the tank body, so that the graduated tube and the tank body are tightly connected.

9. The device for detecting the gas production of the core package according to claim 1, characterized in that: The graduated tube is made of a transparent high temperature resistant material, and a side wall of the graduated tube is provided with graduations.

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