Cylindrical battery cap structure

Abstract

The utility model discloses a cylindrical battery cap structure, including top cover piece, insulating ring, thermistor, reset spring, sealing bead, upper pole, lower pole, sealing ring, inner insulating piece, adapter piece. The upper, lower pole all are installed in the top cover piece, is equipped with thermistor between the upper, lower pole, and the lower pole lower part is connected with adapter piece, and sealing bead movable sleeve is placed in the upper pole, and reset spring is respectively top -contacting on the upper pole counterbore bottom surface and sealing bead, and insulating ring fixed sleeve is placed in the top cover piece, and sealing ring sets up between lower pole and top cover piece, and inner insulating piece fixedly is attached in the bottom surface of top cover piece. When the gas produced in the battery reaches certain pressure, pushes sealing bead to retreat, and the gas is relieved pressure through the spring gap and the through -hole of upper pole, and after pressure relief, sealing bead resets under the action of reset spring, and due to the utility model still can continue to use after pressure relief, has the advantages of repeated use, high utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cylindrical battery cap structure. Background Technology

[0002] The battery cap is an important component of a battery. It provides a sealed enclosure and functions as a safety valve. A typical battery cap consists of a top cover, a safety valve, and a bottom cover. The top cover provides the positive conductive terminal. During battery use, especially during charging and discharging, the electrolyte inside the battery decomposes, producing a large amount of gas. Because the battery cap directly seals the battery, it is difficult for this gas to escape. Excessive gas pressure can easily damage the battery or cause it to explode. Figure 1 As shown, Chinese Patent (Patent No. 202420387112.6) discloses a cylindrical battery cap structure, which includes a conductive connecting piece 200 located inside the cap body 100. The conductive connecting piece 200 is used for electrical connection with the battery body, allowing the cylindrical battery to connect to the external power supply. An explosion-proof piece 300 is used in case of abnormally high internal pressure in the cylindrical battery. An insulating gasket 400 is provided between the explosion-proof piece 300 and the conductive connecting piece 200. In this explosion-proof structure, when the internal gas pressure of the battery is greater than 1.2-0.1 MPa, the lower conical groove of the explosion-proof groove 320 of the explosion-proof piece reverses and bulges upward, breaking the connection with the CID fuse 500 and the conductive connecting piece 200, forming an open circuit. When the internal gas pressure of the battery is greater than 2.0-0.1 MPa, the explosion-proof groove 320 of the explosion-proof piece ruptures, and the high-pressure gas inside the battery casing is discharged from the four vent holes of the top cover of the cap. This type of cylindrical battery cap explosion-proof structure becomes unusable if the explosion-proof sheet breaks at 300 degrees, resulting in low utilization. Utility Model Content

[0003] The purpose of this invention is to provide a reusable cylindrical battery cap structure with high utilization rate.

[0004] To achieve the above objectives, the technical solution of this utility model is:

[0005] This utility model is a cylindrical battery cap structure, including a top cover plate, an insulating ring, a thermistor, a reset spring, a sealing bead, an upper electrode post, a lower electrode post, a sealing ring, an inner insulating plate, and an adapter plate;

[0006] The top cover plate has a mounting groove in its middle, with upper and lower openings on its top and bottom surfaces. The lower part of the upper electrode and the upper part of the lower electrode are both installed within the mounting groove of the top cover plate. A thermistor is provided between the upper and lower electrodes. The upper part of the upper electrode extends upward through the upper opening of the top cover plate, and the lower part of the lower electrode extends downward through the lower opening of the top cover plate and connects to the adapter plate. The middle of the upper electrode has a countersunk hole and a through hole. The through hole passes laterally through the upper part of the upper electrode and communicates with the countersunk hole for pressure relief. The lower electrode... The middle part has a through hole, the countersunk hole of the upper pole is connected to the through hole of the lower pole, the sealing bead is movably sleeved in the countersunk hole of the upper pole and abuts against the upper part of the through hole of the lower pole, the return spring is installed in the countersunk hole of the upper pole and abuts against the bottom surface of the countersunk hole of the upper pole and the sealing bead respectively; the insulating ring is fixedly sleeved on the upper part of the mounting groove of the top cover plate and snapped on the protruding edge of the lower part of the upper pole, and the sealing ring is set between the lower pole and the top cover plate; the inner insulating sheet is fixedly attached to the bottom surface of the top cover plate and the through hole in the middle of the inner insulating sheet is sleeved on the lower part of the lower pole.

[0007] The sealing ring is installed in the mounting groove of the top cover plate, and the sealing ring is located between the upper protrusion of the lower pole and the bottom surface of the mounting groove, and between the lower part of the lower pole and the lower opening of the top cover plate.

[0008] The upper electrode post countersunk hole has a tapered guide groove at its open end; the lower electrode post through hole has a tapered groove at its upper end.

[0009] The adapter plate has a circular hole in the middle, which is connected to the through hole of the lower electrode post.

[0010] The outer diameter of the sealing bead is smaller than the countersunk hole of the upper pole post but larger than the through hole of the lower pole post.

[0011] With the above solution, this utility model includes a top cover, an insulating ring, a thermistor, a reset spring, a sealing bead, an upper electrode post, a lower electrode post, a sealing ring, an inner insulating sheet, and an adapter piece. When the gas generated inside the battery reaches a certain pressure, it pushes the sealing bead backward, and the gas is depressurized through the spring gap and the through hole of the upper electrode post. After depressurization, the sealing bead resets and seals under the force of the reset spring. A thermistor is embedded between the upper and lower electrode posts. Before the battery experiences temperature rise and runaway, the positive temperature coefficient thermistor starts to operate, and its resistance increases with the temperature, thereby preventing safety issues caused by temperature runaway due to battery overcurrent. When the battery temperature drops, the PTC can return to normal resistance. This utility model can continue to be used after depressurization, and has the advantages of reusability and high utilization rate.

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an existing patent;

[0014] Figure 2 This is an isometric drawing of this utility model;

[0015] Figure 3 This is a cross-sectional view of the present invention. Detailed Implementation

[0016] like Figure 2 , Figure 3 As shown, this utility model is a cylindrical battery cap structure, including a top cover plate 1, an insulating ring 2, a thermistor 3, a reset spring 4, a sealing bead 5, an upper electrode post 6, a lower electrode post 7, a sealing ring 8, an inner insulating sheet 9, and an adapter plate 10.

[0017] The top cover plate 1 has a mounting groove 11 in the middle, and the top and bottom surfaces of the mounting groove 11 have an upper opening 12 and a lower opening 13. The lower part 61 of the upper electrode 6 and the upper part 71 of the lower electrode 7 are both installed in the mounting groove 11 of the top cover plate 1. A thermistor 3 is provided between the upper electrode 6 and the lower electrode 7. The upper part 62 of the upper electrode 6 extends upward through the upper opening 12 of the top cover plate 1, and the lower part 72 of the lower electrode 7 extends downward through the lower opening 13 of the top cover plate 1 and is connected to the adapter plate 10. The middle part of the upper electrode 6 has a countersunk hole 63 and a through hole 64. The through hole 64 passes laterally through the upper part 62 of the upper electrode 6 and communicates with the countersunk hole 63 for pressure relief. The middle part of the lower electrode 7 has a through hole 73. The countersunk hole 63 of the upper electrode 6 and the through hole 74 of the lower electrode 7 are connected. Hole 73 is connected, and the adapter piece 10 has a round hole in the middle, which is connected to the through hole 73 of the lower pole piece 7; the sealing bead 5 is movably sleeved in the countersunk hole 63 of the upper pole piece 6 and abuts against the upper part of the through hole 73 of the lower pole piece 7; the return spring 4 is installed in the countersunk hole 63 of the upper pole piece 6 and abuts against the bottom surface of the countersunk hole 63 of the upper pole piece 6 and the sealing bead 5 respectively; the outer diameter of the sealing bead 5 is smaller than the countersunk hole 63 of the upper pole piece 6 but larger than the through hole 73 of the lower pole piece 7; the insulating ring 2 is fixedly sleeved on the upper part of the mounting groove 11 of the top cover piece 1 and is snapped onto the protruding edge 65 of the lower part 61 of the upper pole piece 6; the sealing ring 8 is set between the lower pole piece 7 and the top cover piece 1; the inner insulating sheet 9 is fixedly attached to the bottom surface of the top cover piece 1 and the through hole 91 in the middle of the inner insulating sheet 9 is sleeved on the lower part 72 of the lower pole piece 7.

[0018] The sealing ring 8 is installed in the mounting groove 11 of the top cover plate 1. The sealing ring 8 is located between the upper part 71 protrusion 74 of the lower pole post 7 and the bottom surface of the mounting groove 11, and between the lower part of the lower pole post 7 and the lower opening 13 of the top cover plate 1.

[0019] The upper pole post 6 has a conical guide groove 631 at the open end of the countersunk hole 63; the lower pole post 7 has a conical groove 731 at the upper end of the through hole 73.

[0020] The working principle of this utility model:

[0021] This utility model is installed on the top of the casing 20. When the gas generated inside the battery reaches a certain pressure, it pushes the sealing bead 5 backward. The gas is then depressurized through the gap of the return spring 4 and the through hole 64 of the upper electrode 6. After depressurization, the sealing bead 5 is reset and sealed under the force of the return spring 4. A thermistor 3 is embedded between the upper electrode 6 and the lower electrode 7. Before the battery experiences temperature rise and runaway, the positive temperature coefficient thermistor 3 starts to operate. Its resistance increases with the temperature, thereby preventing safety issues caused by temperature runaway due to battery overcurrent. When the battery temperature drops, the PTC can return to normal resistance.

[0022] The above description is merely a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present utility model should still fall within the scope of the patent of the present utility model.

Claims

1. A cylindrical battery cap structure, characterized in that: Includes top cover plate, insulating ring, thermistor, reset spring, sealing bead, upper pole, lower pole, sealing ring, inner insulating sheet, and adapter plate; The top cover plate has a mounting groove in its middle, with upper and lower openings on its top and bottom surfaces. The lower part of the upper electrode and the upper part of the lower electrode are both installed within the mounting groove of the top cover plate. A thermistor is provided between the upper and lower electrodes. The upper part of the upper electrode extends upward through the upper opening of the top cover plate, and the lower part of the lower electrode extends downward through the lower opening of the top cover plate and connects to the adapter plate. The middle of the upper electrode has a countersunk hole and a through hole. The through hole passes laterally through the upper part of the upper electrode and communicates with the countersunk hole for pressure relief. The lower electrode... The middle part has a through hole, the countersunk hole of the upper pole is connected to the through hole of the lower pole, the sealing bead is movably sleeved in the countersunk hole of the upper pole and abuts against the upper part of the through hole of the lower pole, the return spring is installed in the countersunk hole of the upper pole and abuts against the bottom surface of the countersunk hole of the upper pole and the sealing bead respectively; the insulating ring is fixedly sleeved on the upper part of the mounting groove of the top cover plate and snapped on the protruding edge of the lower part of the upper pole, and the sealing ring is set between the lower pole and the top cover plate; the inner insulating sheet is fixedly attached to the bottom surface of the top cover plate and the through hole in the middle of the inner insulating sheet is sleeved on the lower part of the lower pole.

2. The cylindrical battery cap structure according to claim 1, characterized in that: The sealing ring is installed in the mounting groove of the top cover plate, and the sealing ring is located between the upper protrusion of the lower pole and the bottom surface of the mounting groove, and between the lower part of the lower pole and the lower opening of the top cover plate.

3. The cylindrical battery cap structure according to claim 1, characterized in that: The upper electrode post countersunk hole has a tapered guide groove at its open end; the lower electrode post through hole has a tapered groove at its upper end.

4. The cylindrical battery cap structure according to claim 1, characterized in that: The adapter plate has a circular hole in the middle, which is connected to the through hole of the lower electrode post.

5. The cylindrical battery cap structure of claim 1, wherein: The outer diameter of the sealing bead is smaller than the countersunk hole of the upper pole post but larger than the through hole of the lower pole post.

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