A device for monitoring the gas production pressure of cylindrical batteries

Abstract

The utility model discloses a cylindrical battery gas production pressure monitoring device, including a cylindrical sleeve, the bottom end of the cylindrical sleeve is provided with a first flange and a second flange connected in a sealed manner, and the inner circumferential wall of the second flange joint is sealed and connected to the outer circumferential wall of the cylindrical sleeve through a first sealing component, the top end of the cylindrical sleeve is provided with a third flange and a fourth flange connected in a sealed manner, and the inner circumferential wall of the fourth flange joint is sealed and connected to the outer circumferential wall of the cylindrical sleeve through a second sealing component, the top surface of the third flange chassis is provided with a pressure sensor, and the chassis of the third flange is provided with an air hole at a position corresponding to the pressure sensor. The utility model provides a cylindrical battery gas production pressure monitoring device, which has good sealing performance and effectively avoids the problem of gas leakage under high pressure of gas production.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure monitoring, in particular to a cylindrical battery gas production pressure monitoring device. Background Art

[0002] Lithium-ion batteries play an important role in consumer electronics, electric vehicles, and energy storage due to their high energy density, safety, good cycle stability, and excellent rate performance. Lithium ions migrate between the positive and negative electrodes through the electrolyte, and interfacial reactions occur between the electrolyte and the positive and negative electrodes. The electrochemical reaction produces gas. Uneven gas distribution and excessive gas will lead to increased interfacial impedance, such as increased membrane impedance and charge transfer impedance, as well as abnormalities in the stress distribution of the pole piece, heat generation of the battery, and internal resistance. As the energy density of lithium nickel cobalt manganese oxide and silicon oxygen or silicon carbon systems increases, the increased nickel and silicon content will dramatically increase the interfacial side reactions and increase the amount of gas production, thereby affecting the electrical and safety performance of the battery.

[0003] Therefore, it is necessary to develop battery gas collection and pressure monitoring equipment to facilitate the study of gas production analysis in high-nickel and high-silicon systems and long-term gas pressure monitoring. Utility Model Content

[0004] The utility model aims to provide a cylindrical battery gas production pressure monitoring device, which has good sealing performance and can effectively avoid the problem of gas leakage under high pressure of the produced gas.

[0005] The technical solution adopted by a cylindrical battery gas production pressure monitoring device disclosed in the utility model is:

[0006] A cylindrical battery gas production pressure monitoring device comprises a cylindrical sleeve, wherein a first flange is provided at the bottom end of the cylindrical sleeve, the inner circumferential wall of the first flange joint is sleeved on the outer circumferential wall of the cylindrical sleeve, the outer circumferential wall of the first flange joint is sleeved with a second flange, the bottom plate of the second flange is sealed and fixedly connected to the bottom plate of the first flange, and the inner circumferential wall of the second flange joint is sealed and connected to the outer circumferential wall of the cylindrical sleeve through a first sealing assembly, a third flange is provided at the top end of the cylindrical sleeve, the inner circumferential wall of the third flange joint is sleeved on the outer circumferential wall of the cylindrical sleeve, the outer circumferential wall of the third flange joint is sleeved with a fourth flange, the bottom plate of the fourth flange is sealed and fixedly connected to the bottom plate of the third flange, and the inner circumferential wall of the fourth flange joint is sealed and connected to the outer circumferential wall of the cylindrical sleeve through a second sealing assembly, a pressure sensor is provided on the top surface of the bottom plate of the third flange, and an air hole is opened at the position of the bottom plate of the third flange corresponding to the pressure sensor.

[0007] As a preferred embodiment, the first sealing assembly includes a steel ring, which is sleeved between the outer circumferential wall of the cylindrical sleeve and the inner circumferential wall of the second flange joint. The first sealing ring and the second sealing ring are respectively provided at both ends of the steel ring. The outer circumferential wall of the steel ring is sealedly connected to the inner circumferential wall of the second flange joint, and the inner circumferential wall of the steel ring is sealedly connected to the outer circumferential wall of the cylindrical sleeve through the first sealing ring and the second sealing ring.

[0008] As a preferred embodiment, a first ring groove and a second ring groove are respectively formed at both ends of the inner wall of the steel ring, and the cross-sections of the first ring groove and the second ring groove are both arc-shaped. The first ring groove cooperates with the first sealing ring, and the second ring groove cooperates with the second sealing ring.

[0009] As a preferred solution, the surface of the first flange chassis is in contact with the surface of the second flange chassis.

[0010] As a preferred solution, the chassis of the first flange is fixedly connected to the chassis of the second flange by a plurality of screws.

[0011] As a preferred solution, the cylindrical sleeve is made of polytetrafluoroethylene.

[0012] As a preferred solution, a connecting pipe is fixedly provided on the top surface of the third flange chassis, an inner peripheral wall of the connecting pipe is provided with an internal thread, and the pressure sensor is threadedly connected to the connecting pipe.

[0013] The beneficial effects of a cylindrical battery gas production pressure monitoring device disclosed by the utility model are as follows: the battery cell is placed in a cylindrical sleeve, and both ends of the cylindrical sleeve are sealed by arranging two flanges and a sealing assembly, with good sealing performance and strong pressure resistance, which can not only avoid the problem of poor sealing due to excessive pressure, but also reduce the risk of short circuit caused by the need for bolt connection of the components at both ends of the battery, thereby ensuring the effective sealing of the high-pressure state of the gas produced by the battery without leakage, so that the pressure sensor can accurately monitor the gas production pressure of the battery through the pores. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of a cylindrical battery gas production pressure monitoring device.

[0015] Figure 2 The utility model is a cross-sectional view of a cylindrical battery gas production pressure monitoring device.

[0016] Figure 3 The utility model is a structural schematic diagram of a steel ring of a cylindrical battery gas production pressure monitoring device.

[0017] 10. Cylindrical sleeve; 20. First flange; 21. Screw; 30. Second flange; 40. First sealing assembly; 41. Steel ring; 411. First ring groove; 412. Second ring groove; 42. First sealing ring; 43. Second sealing ring; 50. Third flange; 51. Air hole; 52. Connecting pipe; 60. Fourth flange; 70. Second sealing assembly; 80. Pressure sensor. DETAILED DESCRIPTION

[0018] The present invention is further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0019] Please refer to Figure 1 and Figure 2 A cylindrical battery gas production pressure monitoring device includes a cylindrical sleeve 10, a first flange 20 is provided at the bottom end of the cylindrical sleeve 10, the inner circumferential wall of the first flange 20 joint is sleeved on the outer circumferential wall of the cylindrical sleeve 10, the outer circumferential wall of the first flange 20 joint is sleeved with a second flange 30, the bottom plate of the second flange 30 is sealed and fixedly connected to the bottom plate of the first flange 20, and the inner circumferential wall of the second flange 30 joint is sealed and connected to the outer circumferential wall of the cylindrical sleeve 10 through a first sealing assembly 40, and the top of the cylindrical sleeve 10 is provided with a third Flange 50, the inner circumferential wall of the third flange 50 joint is sleeved on the outer circumferential wall of the cylindrical sleeve 10, the outer circumferential wall of the third flange 50 joint is sleeved with a fourth flange 60, the chassis of the fourth flange 60 is sealed and fixedly connected to the chassis of the third flange 50, and the inner circumferential wall of the fourth flange 60 joint is sealed and connected to the outer circumferential wall of the cylindrical sleeve 10 through the second sealing assembly 70, the top surface of the chassis of the third flange 50 is provided with a pressure sensor 80, and the chassis of the third flange 50 is provided with an air hole 51 at the position corresponding to the pressure sensor 80.

[0020] In the above scheme, the battery cell is placed in the cylindrical sleeve 10, and both ends of the cylindrical sleeve 10 are sealed by setting two flanges and sealing components. The sealing performance is good and the pressure resistance is strong. It can not only avoid the problem of poor sealing due to excessive pressure, but also reduce the risk of short circuit caused by the need for bolt connection of the components at both ends of the battery, ensuring the effective sealing of the high-pressure gas produced by the battery without leakage, so that the pressure sensor 80 can accurately monitor the gas production pressure of the battery through the air hole 51.

[0021] Please refer to Figure 2 The first sealing assembly 40 includes a steel ring 41, which is sleeved between the outer circumferential wall of the cylindrical sleeve 10 and the inner circumferential wall of the second flange 30 joint. The two ends of the steel ring 41 are respectively provided with a first sealing ring 42 and a second sealing ring 43. The outer circumferential wall of the steel ring 41 is sealed and connected to the inner circumferential wall of the second flange 30 joint. The inner circumferential wall of the steel ring 41 is sealed and connected to the outer circumferential wall of the cylindrical sleeve 10 through the first sealing ring 42 and the second sealing ring 43.

[0022] In the above scheme, the steel ring 41, the first sealing ring 42 and the second sealing ring 43 form the first sealing assembly 40, which realizes the sealing connection between the inner circumferential wall of the second flange 30 joint and the outer circumferential wall of the cylindrical sleeve 10, and the double-layer sealing effect is better. Specifically, the inner diameters of the first sealing ring 42 and the second sealing ring 43 are slightly smaller than the outer diameter of the cylindrical sleeve 10, further improving the air tightness. In addition, it should be noted that since the second sealing assembly 70 has the same structure as the first sealing assembly 40, it is not described in detail.

[0023] Please refer to Figure 3 A first annular groove 411 and a second annular groove 412 are respectively formed at both ends of the inner circumferential wall of the steel ring 41. The cross sections of the first annular groove 411 and the second annular groove 412 are both arc-shaped. The first annular groove 411 cooperates with the first sealing ring 42, and the second annular groove 412 cooperates with the second sealing ring 43.

[0024] In the above solution, the first annular groove 411 and the second annular groove 412 with arc-shaped cross sections facilitate the installation of the first sealing ring 42 and the second sealing ring 43, and the structure is stable and the connection is tight.

[0025] Please refer to Figure 1 and Figure 2 The surface of the first flange 20 chassis is in contact with the surface of the second flange 30 chassis. Specifically, the first flange 20 chassis is fixedly connected with the second flange 30 chassis by a plurality of screws 21.

[0026] In the above solution, the surface of the chassis of the first flange 20 and the surface of the chassis of the second flange 30 are closely fitted and then fixedly connected by a plurality of screws 21, thereby ensuring sealing. Specifically, the plurality of screws 21 are evenly distributed around the axis of the first flange 20. It should be noted that the third flange 50 and the fourth flange 60 are also connected by the same structure, so they are not described in detail.

[0027] Please refer to Figure 1 Specifically, the cylindrical sleeve 10 is made of polytetrafluoroethylene. In other embodiments, the cylindrical sleeve 10 may also be made of one or more combinations of quartz glass, polytetrafluoroethylene or PET.

[0028] Please refer to Figure 2 Specifically, a connecting pipe 52 is fixedly provided on the top surface of the chassis of the third flange 50, and an inner wall of the connecting pipe 52 is provided with an internal thread. The pressure sensor 80 is threadedly connected to the connecting pipe 52, which is convenient for disassembly and assembly and has a tight connection.

[0029] The utility model provides a cylindrical battery gas production pressure monitoring device, wherein the battery core is placed in a cylindrical sleeve, and both ends of the cylindrical sleeve are sealed by arranging two flanges and a sealing component, with good sealing performance and strong pressure resistance, which can not only avoid the problem of poor sealing due to excessive pressure, but also reduce the short circuit risk caused by the need for bolt connection of the components at both ends of the battery, thereby ensuring the effective sealing of the high-pressure state of the gas produced by the battery without leakage, so that the pressure sensor can accurately monitor the gas production pressure of the battery through the air hole.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A cylindrical battery gas production pressure monitoring device, characterized in that: It includes a cylindrical sleeve, a first flange is provided at the bottom end of the cylindrical sleeve, the inner circumferential wall of the first flange joint is sleeved on the outer circumferential wall of the cylindrical sleeve, the outer circumferential wall of the first flange joint is sleeved with a second flange, the chassis of the second flange is sealed and fixedly connected to the chassis of the first flange, and the inner circumferential wall of the second flange joint is sealed and connected to the outer circumferential wall of the cylindrical sleeve through a first sealing component, a third flange is provided at the top end of the cylindrical sleeve, the inner circumferential wall of the third flange joint is sleeved on the outer circumferential wall of the cylindrical sleeve, the outer circumferential wall of the third flange joint is sleeved with a fourth flange, the chassis of the fourth flange is sealed and fixedly connected to the chassis of the third flange, and the inner circumferential wall of the fourth flange joint is sealed and connected to the outer circumferential wall of the cylindrical sleeve through a second sealing component, a pressure sensor is provided on the top surface of the chassis of the third flange, and an air hole is opened at the position of the chassis of the third flange corresponding to the pressure sensor.

2. A cylindrical battery gas production pressure monitoring device as claimed in claim 1, characterized in that: The first sealing assembly includes a steel ring, which is sleeved between the outer circumferential wall of the cylindrical sleeve and the inner circumferential wall of the second flange joint. The first sealing ring and the second sealing ring are respectively provided at both ends of the steel ring. The outer circumferential wall of the steel ring is sealedly connected to the inner circumferential wall of the second flange joint, and the inner circumferential wall of the steel ring is sealedly connected to the outer circumferential wall of the cylindrical sleeve through the first sealing ring and the second sealing ring.

3. A cylindrical battery gas production pressure monitoring device as claimed in claim 2, characterized in that: The inner wall of the steel ring is provided with a first ring groove and a second ring groove at both ends thereof, wherein the cross sections of the first ring groove and the second ring groove are both arc-shaped, the first ring groove cooperates with the first sealing ring, and the second ring groove cooperates with the second sealing ring.

4. A cylindrical battery gas production pressure monitoring device as claimed in claim 1, characterized in that: The surface of the first flange chassis is in contact with the surface of the second flange chassis.

5. A cylindrical battery gas production pressure monitoring device as claimed in claim 4, characterized in that: The chassis of the first flange is fixedly connected to the chassis of the second flange by a plurality of screws.

6. A cylindrical battery gas production pressure monitoring device as claimed in claim 1, characterized in that: The cylindrical sleeve is made of polytetrafluoroethylene.

7. A cylindrical battery gas production pressure monitoring device as claimed in claim 1, characterized in that: A connecting pipe is fixedly provided on the top surface of the third flange chassis, an inner peripheral wall of the connecting pipe is provided with an internal thread, and the pressure sensor is threadedly connected to the connecting pipe.

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