Secondary battery gas on-line monitoring device

Abstract

The utility model provides a secondary battery gas on-line monitoring device, which relates to the technical field of battery monitoring, and comprises a box body, and a battery fixing groove for accommodating a battery is arranged in the box body; a pole is arranged on the box body, one end of the pole penetrates into the battery fixing groove and is used for being connected with a battery, and the other end of the pole penetrates out of the outer surface of the box body; a multi-way valve is fixedly arranged on the box body, and the first end of the multi-way valve is communicated with the battery fixing groove; a gas replacement valve is further fixedly arranged on the box body; a pressure sensor is arranged on the box body and is used for acquiring the pressure in the battery fixing groove; a needling device is further arranged at the top of the box body and used for puncturing a safety valve at the top of the battery. According to the utility model, the gas production of the secondary battery can be accurately monitored on line.

Description

Technical Field

[0001] The utility model relates to the technical field of battery monitoring, in particular to an online gas monitoring device for a secondary battery. Background Art

[0002] With the rapid development of electronic devices, electric vehicles and energy storage systems, the application of secondary batteries (such as lithium-ion batteries, sodium-ion batteries, etc.) has become more and more widespread. Secondary batteries have become the main energy storage device due to their high energy density, long cycle life and low self-discharge rate. However, during the use of secondary batteries, gases may be generated inside, and the composition and gas production of these gases are directly related to the safety and performance of the battery. During the charging, discharging and cycling of the battery, the decomposition of the electrolyte, the reaction of the positive and negative electrode materials, etc. will lead to the generation of gas. If not detected and handled in time, the generated gas may cause the internal pressure of the battery to increase, and even cause safety problems such as battery swelling, leakage or explosion. Therefore, it is of great significance to monitor the gas composition and gas production inside the secondary battery.

[0003] The existing technology usually uses an offline detection method to analyze the gas composition and gas production inside the battery. It is necessary to disassemble the battery, extract the gas sample, and send it to the laboratory for testing. However, this process is not only cumbersome and time-consuming, but may also cause damage to the battery or cause deviations in the test results due to mixing with other gases. In addition, there are some online detection methods in the prior art. For example, the invention patent with publication number CN117110899A discloses an in-situ detection method for lithium batteries. However, when packaging the in-situ detection device, there is still a risk of mixing with other gases in this patent, which may cause deviations in the test results. Utility Model Content

[0004] The utility model aims to provide a secondary battery gas online monitoring device to achieve online accurate monitoring of the gas production of the secondary battery.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an online gas monitoring device for a secondary battery, comprising a box body, wherein the box body has a battery fixing groove for accommodating a battery; a pole is arranged on the box body, one end of the pole is inserted into the battery fixing groove for being connected to the battery, and the other end of the pole is inserted into the outer surface of the box body; a multi-way valve is fixedly arranged on the box body, and the first end of the multi-way valve is connected to the battery fixing groove; a gas replacement valve is also fixedly arranged on the box body; a pressure sensor is arranged on the box body for obtaining the pressure in the battery fixing groove; a puncture device is also arranged on the top of the box body for puncturing the safety valve on the top of the battery.

[0006] Compared with the prior art, the beneficial effects of the utility model are:

[0007] The utility model provides an online monitoring device for secondary battery gas, wherein a box body is provided with a battery fixing groove for accommodating a battery, and a pole is arranged on the box body, one end of the pole penetrates into the battery fixing groove and is connected to the battery, and the other end penetrates out of the outer surface of the box body and is connected to an external power supply, thereby realizing in-situ detection; a multi-way valve can cooperate with a gas replacement valve to realize the replacement of gas in the battery fixing groove inside the box body, so as to discharge other gases or impurities existing in the battery fixing groove, thereby ensuring accurate monitoring of battery gas production; a pressure sensor is arranged on the box body, and real-time monitoring of battery gas production can be realized by obtaining the internal gas pressure of the battery fixing groove, and the puncture timing can be determined by the pressure sensor. When the puncture requirements are met, the puncture operation on the battery is performed to release the internal gas of the battery, thereby realizing monitoring of gas production and gas composition. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic structural diagram of a secondary battery gas online monitoring device provided in this embodiment.

[0009] Among them, 1. box body; 101. battery fixing slot; 102. pole; 2. battery; 3. multi-way valve; 31. manual valve; 4. gas replacement valve; 5. pressure sensor; 6. acupuncture device. DETAILED DESCRIPTION

[0010] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0011] like Figure 1 As shown, this embodiment provides an online gas monitoring device for a secondary battery, including a box body 1, wherein the box body 1 has a battery fixing groove 101 for accommodating a battery. A pole 102 is provided on the box body 1, one end of the pole 102 penetrates into the battery fixing groove 101 for connecting with the battery 2, and the other end of the pole 102 penetrates out of the outer surface of the box body 1. A multi-way valve 3 is fixedly provided on the box body 1, and the first end of the multi-way valve 3 is connected to the battery fixing groove 101. A gas replacement valve 4 is also fixedly provided on the box body 1. A pressure sensor 5 is provided on the box body 1 for obtaining the pressure in the battery fixing groove 101. A puncture device 6 is also provided on the top of the box body for puncturing the safety valve on the top of the battery to release the gas produced inside the battery 2.

[0012] In order to achieve online, real-time and accurate monitoring of the internal gas composition and gas production of secondary batteries, the present embodiment provides an online gas monitoring device for secondary batteries. The device mainly targets secondary batteries (including lithium-ion batteries and sodium-ion batteries, but not limited to these two types of secondary batteries) that produce gas due to side reactions during formation, capacity separation, abuse (high temperature and high humidity, overcharging, over-discharge, etc.) and long-term use. The device is used to provide strong support for the matching design between key materials in the early stage of the battery, the boundary conditions of battery abuse, and the evaluation of the impact of changes in gas production components and gas production at different times during long-term use on performance evolution and safety performance.

[0013] The box body 1 includes a first box body and a second box body, wherein the second box body is a concave structure, and a battery fixing groove 101 is formed at the concave part. The first box body covers the second box body and seals the battery fixing groove 101. The first box body and the second box body are detachably connected, for example, they can be connected by bolts and nuts. A sealing ring is also provided between the first box body and the second box body to achieve the sealing of the box body, and the sealing ring can be made of anti-corrosion fluoropolymer.

[0014] A pole 102 is fixedly arranged on the top of the box body 1. The pole 102 includes a positive pole and a negative pole. The first ends of the positive pole and the negative pole pass through the box body 1 and extend into the battery fixing groove 101, and are used to be connected to the positive and negative poles of the battery 2 to be tested through a clamp (not shown in the figure). The second ends of the positive pole and the negative pole are located outside the box body 1 and are used to be connected to an external power supply, thereby realizing in-situ monitoring of the battery 2. A sealing device is provided at the position where the positive pole and the negative pole pass through the box body 1 to ensure the sealing of the connection.

[0015] A multi-way valve 3 is fixedly arranged on the upper side of the box body 1. One end of the multi-way valve 3 in this embodiment is connected to the battery fixing groove 101, and the other end is located outside the box body 1. It has three openable and closable manual valves 31, which can be connected to gas analysis and analysis equipment (such as gas chromatography GC, gas phase mass spectrometry GC-MS, etc.), external vacuum source, and inert gas source. By controlling the opening and closing of the manual valve 31, the gas environment in the battery fixing groove can be replaced, or the internal vacuum degree can be adjusted, and the internal gas can be collected in real time by the gas analysis and analysis equipment to analyze and test the gas components.

[0016] The box body 1 is also provided with a gas replacement valve 4, which is preferably arranged at a position away from the multi-way valve 3. In the present embodiment, the gas replacement valve 4 and the multi-way valve 3 are respectively arranged on both sides of the box body 1, and the multi-way valve 3 is arranged at the upper part of one side of the box body 1, and the gas replacement valve 4 is arranged at the lower part of the other side of the box body 1. The gas replacement valve 4 is used to cooperate with the multi-way valve 3 to achieve the replacement of the internal gas environment of the battery fixing groove 101. For example, after the battery is placed in the battery fixing groove, the manual valve connected to the inert gas source and the gas replacement valve of the multi-way valve are opened, and the inert gas is introduced into the battery fixing groove through the multi-way valve, and the gas originally in the battery fixing groove is discharged through the gas replacement valve, thereby achieving gas replacement and avoiding the influence of the internal gas on the monitoring accuracy.

[0017] A puncture device 6 is provided on the top of the box body 1. The puncture needle of the puncture device 6 penetrates the top of the box body 1 and extends into the battery fixing groove 101. It can move into the battery fixing groove 101, so as to puncture the safety valve on the top of the battery 2 during the test to release the gas inside the battery and perform the gas composition and gas production test.

[0018] A high-precision pressure sensor 5 is provided on the box body 1. The pressure sensor 5 is provided on the top of the box body 1. The probe of the pressure sensor 5 extends into the battery fixing groove 101 to monitor the internal pressure in real time. The outside of the pressure sensor 5 is a pressure gauge that can display the pressure value. The gas pressure in the battery fixing groove 101 can be monitored in real time through the reading of the pressure gauge. In this embodiment, in order to ensure the integrity and sealing of the box body 1, the pressure sensor 5 is integrated with the multi-way valve 3, and the probe of the pressure sensor 5 extends into the chamber connected between the multi-way valve 3 and the battery fixing groove 101, thereby realizing real-time monitoring of the pressure in the battery fixing groove 101.

[0019] A battery fixing device may also be provided in the battery fixing groove 101. The battery fixing device may be a fixed block of a fixed shape, or a structure such as a piston and a piston push rod that can clamp the battery by telescoping, thereby achieving adaptation to batteries of various shapes and sizes.

[0020] When testing a secondary battery, place the battery 2 to be tested in the battery fixing slot 101, connect the electrode of the battery 2 to the pole 102, then cover the second box body and lock the second box body with the first box body with bolts. Connect the pole 102 to the external power supply, and connect the external power supply to the internal battery through the pole to perform online testing. According to the test requirements, the specific connection method and other requirements of the pole can be further adjusted as needed. According to the needs of the test, the internal space of the battery fixing slot is subjected to normal pressure, vacuum, inert gas replacement and other operations by controlling different manual valves. At the same time, the real-time air pressure value in the battery fixing slot is monitored by a pressure sensor. During the test, according to the actual test requirements, the safety valve on the top of the battery can be punctured by a needle puncture device under different charge and discharge conditions to release the gas in the battery. The multi-way valve is externally connected to a gas detection device, such as a gas chromatograph, a gas-liquid chromatography and other analysis devices, to analyze the components and amount of gas produced inside the battery. By adjusting the multi-way valve, the gas in the device can enter the external gas detection device for real-time dynamic detection, which can effectively avoid contamination and oxidation during gas transportation and accurately analyze the gas components.

[0021] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A secondary battery gas online monitoring device, characterized in that: The invention comprises a box body, wherein the box body has a battery fixing groove for accommodating a battery; the box body is provided with a pole, one end of which penetrates into the battery fixing groove for being connected to the battery, and the other end of which penetrates out of the outer surface of the box body; a multi-way valve is fixedly provided on the box body, and a first end of the multi-way valve is connected to the battery fixing groove; a gas replacement valve is also fixedly provided on the box body; a pressure sensor is provided on the box body for obtaining the pressure in the battery fixing groove; a puncture device is also provided on the top of the box body for puncturing the safety valve on the top of the battery.

2. A secondary battery gas online monitoring device as claimed in claim 1, characterized in that: The poles are fixedly arranged on the top of the box body, and the poles include a positive pole and a negative pole.

3. A secondary battery gas online monitoring device as claimed in claim 1, characterized in that: The second end of the multi-way valve is located outside the box body and includes three openable and closable manual valves.

4. A secondary battery gas online monitoring device as claimed in claim 1, characterized in that: The gas replacement valve and the multi-way valve are respectively arranged on two sides of the box body.

5. A secondary battery gas online monitoring device as claimed in claim 4, characterized in that: The multi-way valve is arranged at the upper part of one side of the box body, and the gas replacement valve is arranged at the lower part of the other side of the box body.

6. The secondary battery gas online monitoring device according to claim 1, characterized in that: The pressure sensor comprises a pressure gauge and a probe, and the probe extends into the battery fixing groove.

7. A secondary battery gas online monitoring device as claimed in claim 1, characterized in that: The box body comprises a first box body and a second box body, the second box body is a concave structure, and the battery fixing groove is formed at the concave part.

8. A secondary battery gas online monitoring device as claimed in claim 7, characterized in that: The first box body and the second box body are connected by bolts and nuts.

9. A secondary battery gas online monitoring device as claimed in claim 8, characterized in that: A sealing ring is arranged at the connection between the first box body and the second box body.

10. The secondary battery gas online monitoring device according to claim 1, characterized in that: A battery fixing device for fixing the battery is also arranged in the battery fixing groove.

Images