Cylindrical battery gas production test connecting device

Abstract

The utility model discloses a cylindrical battery gas production test connecting device which comprises an outer shell with two through ends, one end of the outer shell is provided with a negative end cover in a sealed mode, an inner cavity of the outer shell is provided with an insulating sleeve, the outer circumferential wall of the insulating sleeve is attached to the inner circumferential wall of the outer shell, one end of the insulating sleeve is open, and the other end of the insulating sleeve is open. The other end of the outer shell is in sealed insertion connection with a connecting piece, one end of the connecting piece extends to the end face of the insulating sleeve, and the end, away from the insulating sleeve, of the connecting piece is in sealed connection with an air pressure sensor. A gas production through hole is formed in the position, corresponding to the connecting through hole, in the connecting piece, one end of the gas production through hole communicates with the connecting through hole, and the other end of the gas production through hole communicates with the gas pressure sensor. According to the cylindrical battery gas production test connecting device provided by the utility model, the sealing connection between the cylindrical battery and the gas pressure sensor during working is realized, so that the gas production monitoring of long-time high-temperature storage and circulation of the battery is realized.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a cylindrical battery gas generation test connection device. Background Technology

[0002] Lithium-ion batteries are considered a key technology for large-scale energy storage and electric vehicles. In recent years, the finite availability of lithium resources and the increasing demand for higher battery energy have made battery safety and lifespan a core research focus. In particular, the gas generation behavior caused by material particle breakage, electrolyte side reactions, and interfacial instability can severely impact battery safety; therefore, studying battery gas generation behavior is beneficial for the large-scale use of lithium-ion batteries. Typically, in lithium-ion batteries, the electrolyte is inevitably oxidized / reduced to produce gas. As the battery operates, these gases accumulate inside the cell, leading to reduced battery capacity, increased impedance, and stripping of active materials. Furthermore, excessive parasitic reactions and lithium plating due to increased impedance can generate uncontrolled heat, causing the solid electrolyte interface layer and separator to generate additional heat and gas, ultimately leading to catastrophic battery combustion or even explosion.

[0003] Therefore, it is crucial to develop effective battery gas collection and pressure monitoring devices and to gain a deeper understanding of gas changes in lithium-ion batteries. Utility Model Content

[0004] The purpose of this invention is to provide a cylindrical battery gas generation test connection device, which realizes a sealed connection between the cylindrical battery and the gas pressure sensor during operation, thereby enabling monitoring of gas generation during long-term high-temperature storage and cycling of the cylindrical battery.

[0005] The technical solution adopted by the cylindrical battery gas generation test connection device disclosed in this utility model is:

[0006] A cylindrical battery gas generation testing connection device includes an outer shell that extends through both ends. One end of the outer shell is sealed with a negative terminal cap. An insulating sleeve is provided in the inner cavity of the outer shell. The outer peripheral wall of the insulating sleeve fits against the inner peripheral wall of the outer shell. One end of the insulating sleeve is open and extends to the end face of the negative terminal cap. A connecting through hole is provided in the middle of the other end of the insulating sleeve. A connector is sealed and inserted into the other end of the outer shell. One end of the connector extends to the end face of the insulating sleeve. A pressure sensor is sealed and connected to the end of the connector away from the insulating sleeve. A gas sampling through hole is provided inside the connector at a position corresponding to the connecting through hole. One end of the gas sampling through hole communicates with the connecting through hole, and the other end of the gas sampling through hole communicates with the pressure sensor.

[0007] As a preferred embodiment, the connector has a blind hole in the middle of the end away from the insulating sleeve, and the inner circumferential wall of the blind hole has an internal thread. One end of the pressure sensor is threadedly connected to the blind hole.

[0008] As a preferred embodiment, a sealing ring is provided on the bottom surface of the connecting blind hole.

[0009] As a preferred embodiment, the outer shell is made of metal and the insulating sleeve is made of plastic.

[0010] As a preferred embodiment, the outer peripheral wall of the connector at the end away from the insulating sleeve is provided with a sealing protrusion ring, and the end face of the sealing protrusion ring is sealed and fitted with the end face of the outer shell.

[0011] As a preferred embodiment, the sealing ring is sealed to the end face of the outer casing by laser welding.

[0012] As a preferred embodiment, the negative end cap is sealed to the end face of the outer casing by laser welding.

[0013] The beneficial effects of the cylindrical battery gas generation test connection device disclosed in this utility model are as follows: the cylindrical battery is installed in an insulating sleeve, the negative terminal of the battery is welded to the negative terminal cap, the positive terminal of the battery passes through the connecting through hole and is welded to the end face of the connector, the gas sampling through hole is used for liquid injection and gas conduction, when monitoring the gas generation pressure, the gas generated by the cylindrical battery is conducted to the gas pressure sensor through the gas sampling through hole, and the negative terminal cap is sealed to one end of the outer shell, and the connector is sealed to the other end of the outer shell, so as to realize the sealed connection between the cylindrical battery and the gas pressure sensor when the cylindrical battery is working, avoid the test error caused by gas leakage, and realize the gas generation monitoring of the cylindrical battery during long-term high-temperature storage and cycling. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a cylindrical battery gas generation test connection device according to the present invention.

[0015] Figure 2 This is a cross-sectional view of a cylindrical battery gas generation testing connection device according to the present invention.

[0016] Figure 3 This is a schematic diagram of the connecting component of a cylindrical battery gas generation test connection device according to the present invention.

[0017] 10. Outer shell; 11. Negative end cap; 20. Insulating sleeve; 21. Connecting through hole; 30. Connector; 31. Gas sampling through hole; 32. Sealing ring; 33. Sealing convex ring; 40. Pressure sensor. Detailed Implementation

[0018] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0019] Please refer to Figures 1 to 3 A cylindrical battery gas generation test connection device includes an outer shell 10 that extends through both ends. One end of the outer shell 10 is sealed with a negative terminal cap 11. An insulating sleeve 20 is provided in the inner cavity of the outer shell 10. The outer peripheral wall of the insulating sleeve 20 fits against the inner peripheral wall of the outer shell 10. One end of the insulating sleeve 20 is open and extends to the end face of the negative terminal cap 11. A connecting through hole 21 is opened in the middle of the other end of the insulating sleeve 20. A connector 30 is sealed and inserted into the other end of the outer shell 10. One end of the connector 30 extends to the end face of the insulating sleeve 20. A pressure sensor 40 is sealed and connected to the end of the connector 30 away from the insulating sleeve 20. A gas sampling through hole 31 is opened inside the connector 30 at the position corresponding to the connecting through hole 21. One end of the gas sampling through hole 31 communicates with the connecting through hole 21, and the other end of the gas sampling through hole 31 communicates with the pressure sensor 40.

[0020] In the above scheme, the cylindrical battery is installed in the insulating sleeve 20, the negative terminal of the battery is welded to the negative end cap 11, and the positive terminal of the battery passes through the connecting through hole 21 and is welded to the end face of the connector 30. The gas sampling through hole 31 is used for liquid injection and gas conduction. When monitoring the gas production pressure, the gas generated by the cylindrical battery is conducted to the gas pressure sensor 40 through the gas sampling through hole 31. The negative end cap 11 is sealed to one end of the outer shell 10, and the connector 30 is sealed to the other end of the outer shell 10. This achieves a sealed connection between the cylindrical battery and the gas pressure sensor 40 when the cylindrical battery is working, avoids test errors caused by gas leakage, and realizes gas production monitoring of the cylindrical battery during long-term high-temperature storage and cycling.

[0021] Please refer to Figure 1 and Figure 2 A blind connection hole is provided in the middle of the end of the connector 30 away from the insulating sleeve 20. The inner circumferential wall of the blind connection hole is provided with an internal thread. One end of the pressure sensor 40 is threadedly connected to the blind connection hole. Furthermore, a sealing ring 32 is provided on the bottom surface of the blind connection hole.

[0022] In the above solution, the pressure sensor 40 is conveniently installed on the connector 30 via a stud connection, making it easy to install and remove, and providing good airtightness. In addition, the sealing ring 32 further improves the airtightness and prevents gas leakage.

[0023] Specifically, the outer casing 10 is made of metal, and the insulating sleeve 20 is made of plastic. The plastic insulating sleeve 20 can prevent short-circuit contact between the metal casing of the battery and the metal outer casing 10. In this embodiment, the outer casing 10 is made of aluminum alloy, which has good heat dissipation performance, and the insulating sleeve 20 is made of PC material, which has good fire resistance.

[0024] Please refer to Figure 2 and Figure 3The outer peripheral wall of the connector 30 away from the insulating sleeve 20 is provided with a sealing protrusion 33, and the end face of the sealing protrusion 33 is sealed and fitted with the end face of the outer shell 10. Specifically, the sealing protrusion 33 is sealed and connected to the end face of the outer shell 10 by laser welding, and the negative end cap 11 is sealed and connected to the end face of the outer shell 10 by laser welding.

[0025] In the above scheme, the sealing protrusion 33 at the end of the connector 30 covers the end of the outer casing 10, and then achieves a sealed connection with the end face of the outer casing 10 by laser welding. This method has high welding efficiency and good airtightness. The negative terminal cap 11 is also sealed to the end face of the outer casing 10 by laser welding. In addition, it should be noted that, in order to fit the cylindrical battery, the outer casing 10, the insulating sleeve 20, and the connector 30 are all cylindrical.

[0026] This utility model provides a cylindrical battery gas generation test connection device. The cylindrical battery is installed in an insulating sleeve, the negative terminal of the battery is welded to the negative terminal cap, and the positive terminal of the battery passes through the connecting through hole and is welded to the end face of the connector. The gas sampling through hole is used for liquid injection and gas conduction. When monitoring the gas generation pressure, the gas generated by the cylindrical battery is conducted to the gas pressure sensor through the gas sampling through hole. The negative terminal cap is sealed to one end of the outer shell, and the connector is sealed to the other end of the outer shell. This achieves a sealed connection between the cylindrical battery and the gas pressure sensor when the battery is working, avoiding test errors caused by gas leakage, and enabling gas generation monitoring of the cylindrical battery during long-term high-temperature storage and cycling.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A cylindrical battery gas generation testing connection device, characterized in that, The device includes an outer shell that extends through both ends. One end of the outer shell is sealed with a negative end cap. An insulating sleeve is provided inside the outer shell. The outer peripheral wall of the insulating sleeve fits against the inner peripheral wall of the outer shell. One end of the insulating sleeve is open and extends to the end face of the negative end cap. A connecting through hole is provided in the middle of the other end of the insulating sleeve. A connector is sealed and inserted into the other end of the outer shell. One end of the connector extends to the end face of the insulating sleeve. A pressure sensor is sealed and connected to the end of the connector away from the insulating sleeve. A gas sampling through hole is provided inside the connector at the position corresponding to the connecting through hole. One end of the gas sampling through hole communicates with the connecting through hole, and the other end of the gas sampling through hole communicates with the pressure sensor.

2. The cylindrical battery gas generation test connection device as described in claim 1, characterized in that, A blind connection hole is provided in the middle of the end of the connector away from the insulating sleeve. An internal thread is provided on the inner peripheral wall of the blind connection hole. One end of the air pressure sensor is threadedly connected to the blind connection hole.

3. The cylindrical battery gas generation test connection device as described in claim 2, characterized in that, A sealing ring is provided on the bottom surface of the connecting blind hole.

4. The cylindrical battery gas generation test connection device as described in claim 1, characterized in that, The outer shell is made of metal, and the insulating sleeve is made of plastic.

5. The cylindrical battery gas generation test connection device as described in claim 1, characterized in that, The outer peripheral wall of the connector away from the insulating sleeve is provided with a sealing protrusion ring, and the end face of the sealing protrusion ring is sealed and fitted with the end face of the outer shell.

6. The cylindrical battery gas generation test connection device as described in claim 5, characterized in that, The sealing ring is connected to the end face of the outer casing by laser welding.

7. The cylindrical battery gas generation test connection device as described in claim 1, characterized in that, The negative end cap is sealed to the end face of the outer casing by laser welding.

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