Astronomical clock power supply battery box

Abstract

The utility model belongs to the technical field of avionic products, and particularly relates to an astronomical clock power supply battery box. Comprising a non-disengaging screw, a power supply circuit board, a lithium battery, a battery mounting box, a sealing groove, a power supply circuit board sealing groove, an energy storage circuit board and a product mounting panel. The lithium battery is placed in the battery mounting box, the power supply circuit board is fixed on the battery box through screws, the battery mounting box is provided with a battery box sealing groove, and the power supply circuit board is provided with a power supply circuit sealing groove; sealing strips are respectively assembled in the battery box sealing groove and the power supply circuit sealing groove to form a power supply circuit; the energy storage circuit board is fixed on the product installation panel, and the power supply circuit is fixed on the product installation panel through an unloosening screw.

Description

Technical Field

[0001] This utility model belongs to the field of aviation electronic product technology, and in particular relates to an astronomical clock power supply battery box. Background Technology

[0002] Time stamps are a crucial parameter for airborne data, and the continuous and accurate provision of clock information is an essential capability for every type of airborne product. Astronomical clocks are required to have a continuous power supply time of ≥10 years, and the real-time clock must continue operating after a power outage, providing historical time accuracy with an annual error of less than 20 seconds.

[0003] Lithium batteries are used to power astronomical clocks in avionics equipment. The selection of lithium battery capacity is affected by factors such as battery capacity, annual self-discharge rate, operating temperature, size and weight. The capacity of lithium batteries must meet the power supply time requirements while controlling the size and weight. Therefore, it is necessary to save battery energy. When there is power on the aircraft, the onboard power supply is used. When the onboard power is off, USB power is used to read data. When the entire machine is powered off, it automatically switches to battery power to ensure that the clock chip continues to work.

[0004] like Figure 1 The existing clock power supply method shown has problems such as easy short-circuit discharge after soldering and design flaws in the battery fixing method, which affect product quality and service life. Maintenance is difficult after a field fault. This utility model provides an astronomical clock power supply battery box that is easy to manufacture and maintain. Utility Model Content

[0005] In view of the problems in the background art, the present invention provides an astronomical clock power supply battery box.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] An astronomical clock power supply battery box, the battery box comprising: a non-removable screw 1, a power supply circuit board 2, a lithium battery 3, a battery mounting box 4, a sealing groove 5, a power supply circuit board sealing groove 6, an energy storage circuit board 9, and a product mounting panel 10.

[0008] The lithium battery 3 is placed in the battery mounting box 4, and the power supply circuit board 2 is fixed to the battery box 4 with screws. The battery mounting box 4 has a battery box sealing groove 5, and the power supply circuit board 2 has a power supply circuit sealing groove 6. Sealing strips are respectively installed in the battery box sealing groove 5 and the power supply circuit sealing groove 6 to form a power supply circuit.

[0009] The energy storage circuit board 9 is fixed on the product mounting panel 10, and the power supply circuit is fixed on the product mounting panel 10 with non-removable screws 1.

[0010] Furthermore,

[0011] The power supply circuit board 2 has three solder holes for soldering to the lithium battery 3.

[0012] Furthermore,

[0013] A spring pin socket 8 is provided on the energy storage circuit board 9, and two metal pads 7 are provided on the top surface of the power supply circuit board 2 for contacting the spring pin socket 8 on the energy storage circuit board 9.

[0014] Furthermore,

[0015] The power supply circuit board 2 is composed of a reinforcing frame and a printed circuit board bonded together. Its external dimensions are 62mm×17mm, and it is fixed to the battery mounting box 1 through four holes.

[0016] Furthermore,

[0017] The energy storage circuit board 9 is composed of two parts: an energy storage circuit reinforcing frame and an energy storage circuit printed circuit board, bonded together. Its external dimensions are 36mm×35mm, and it is fixed to the product mounting panel 10 through four holes.

[0018] Furthermore,

[0019] The lithium battery 3 is cylindrical with built-in solder pads for the positive and negative electrodes, which are soldered onto the printed circuit board of the power supply circuit board 2. The lithium battery 3 is then bonded to the inside of the battery mounting box 4 with epoxy resin adhesive.

[0020] This invention provides a battery box for an astronomical clock. During manufacturing, all circuits are wire-free, facilitating assembly and transportation. For field maintenance and replacement, only the four non-removable screws securing the battery box need to be removed to allow for complete removal and replacement. No soldering is required during replacement. When the battery reaches the end of its lifespan, it does not need to be returned to the factory for repair, reducing the time required for field maintenance of the battery box components. Attached Figure Description

[0021] Figure 1 A schematic diagram of the existing clock power supply method;

[0022] Figure 2 This is a schematic diagram of the energy storage circuit of this utility model;

[0023] Figure 3 This is a schematic diagram of the power supply circuit of this utility model;

[0024] Figure 4 This is a schematic diagram of the battery box encapsulation process of this utility model;

[0025] Figure 5 This is the overall design drawing of the battery box that powers this utility model. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings.

[0027] This utility model embodiment provides an astronomical clock power supply battery box that is easy to manufacture and maintain. It comprises three parts: a power supply circuit, an energy storage circuit, and a battery mounting box 4. The power supply circuit provides the power required by the astronomical clock. The lithium battery 3, with its own solder pads, connects to the power supply circuit, and both are fixed together on the battery mounting box 4. The energy storage circuit prevents momentary loss of contact during vibration.

[0028] The power supply circuit consists of two parts: a power supply circuit board 2 and a lithium battery 3. The lithium battery 3 is soldered onto the power supply circuit board to form the power supply circuit. The power supply circuit board 2 consists of a power supply circuit printed circuit board and a power supply circuit reinforcing frame. The top surface of the power supply circuit printed circuit board is designed with metal pads, and the top surface is bonded to the power supply circuit reinforcing frame to prevent short circuit discharge. The power supply circuit reinforcing frame is designed with a sealing groove for mounting a conductive sealing strip, which plays a sealing role when the power supply circuit board 2 and the energy storage circuit board 9 are connected.

[0029] The battery mounting box 4 is designed with a sealing groove for assembling a double-peaked conductive sealing strip. The inner ring prevents electromagnetic penetration, while the outer ring provides a seal to prevent external corrosive substances from entering the equipment. The battery mounting box 4 is designed with four threaded holes for assembling non-removable screws 1. This serves two purposes: first, it reduces the possibility of accidental screw loss during field maintenance; second, it facilitates the removal of the battery box from the product for replacement.

[0030] Specifically,

[0031] like Figure 5 As shown, an astronomical clock power supply battery box includes: a non-removable screw 1, a power supply circuit board 2, a lithium battery 3, a battery mounting box 4, a sealing groove 5, a power supply circuit board sealing groove 6, an energy storage circuit board 9, and a product mounting panel 10.

[0032] The lithium battery 3 is placed in the battery mounting box 4, and the power supply circuit board 2 is fixed to the battery box 4 with screws. The battery mounting box 4 has a battery box sealing groove 5, and the power supply circuit board 2 has a power supply circuit sealing groove 6. Sealing strips are respectively installed in the battery box sealing groove 5 and the power supply circuit sealing groove 6 to form a power supply circuit.

[0033] The energy storage circuit board 9 is fixed on the product mounting panel 10, and the power supply circuit is fixed on the product mounting panel 10 with non-removable screws 1.

[0034] Assembly sequence: First, place the lithium battery 3 inside the battery box 4, fix the power supply circuit board 2 to the battery box 4 with screws, and assemble the sealing strips into the sealing groove 5 of the battery box and the sealing groove 6 of the power supply circuit respectively. After encapsulation, a complete power supply circuit is formed. Then, fix the energy storage circuit board 9 to the product mounting panel 10, and fix the power supply circuit to the product mounting panel 10 with the non-removable screws 1. The metal pads 7 on the power supply circuit can contact the spring pin sockets 8 on the energy storage circuit to achieve complete assembly.

[0035] Lithium battery capacity selection:

[0036] The astronomical clock chip operates at a current of less than 1.68uA at an ambient temperature of 25 degrees Celsius and less than 6uA at an ambient temperature of 85 degrees Celsius. For a power supply period of 10 years, a battery capacity of 525.6mAh is required. Considering the changes in the operating characteristics of lithium battery 3 under high and low temperature conditions, as well as the impact of annual self-discharge rate, sufficient margin must be reserved while meeting product design requirements.

[0037] According to the lithium battery standard requirements, when selecting a lithium battery with dimensions of Φ14.5×50.5 and a capacity of 2100mAh, and assuming an annual self-discharge rate (20℃) of <2%, the self-discharge over 10 years is 384.1mAh. Therefore, when the lifespan is 10 years, the required battery capacity is 909.7mAh. Based on a lithium battery capacity of 2100mAh, a current consumption of 6uA, and an annual self-discharge rate of 2%, theoretically, the lithium battery 3 can provide power for approximately 24 years, which meets the requirements.

[0038] Power supply circuit board 2 design:

[0039] like Figure 3 As shown, the power supply circuit board 2 is an independent module, consisting of a reinforcing frame and a printed circuit board bonded together. Its dimensions are 62mm × 17mm, and it is fixed to the battery mounting box 1 through four holes. The power supply circuit board 2 has three solder holes (X1, X2, X3) for soldering to the lithium battery 3. Two metal pads 7 (X4, X5) are designed on the top surface of the power supply circuit board 2, which mate with the spring pin connector 8 on the power supply circuit board 2, enabling communication between the two.

[0040] like Figure 2As shown, the energy storage circuit board 9 is an independent module, consisting of a reinforcing frame and a printed circuit board bonded together. Its dimensions are 36mm × 35mm, and it is fixed inside the product through four holes. The energy storage circuit board 9 has two solder holes (X1 x 2) for connecting to the astronomical clock chip inside the product. Two spring-loaded connectors 8 (X3 x 4) are mounted on the top surface of the energy storage circuit board 9. The extension range of the spring-loaded connectors 8 is 0–2mm, with the spring pins pointing towards the power supply circuit board 2. After the power supply circuit board 2 is fixed to the product, communication between the two can be achieved. A capacitor C1 is designed on the energy storage circuit board 9 for energy storage, preventing momentary contact loss during vibration. The astronomical clock requires only 6uA of power supply current under high-temperature conditions, and the capacitor can power the astronomical clock. The schematic diagram of the energy storage circuit is shown below. Figure 2 .

[0041] Battery box potting design:

[0042] The lithium battery 3 is cylindrical with built-in solder pads for the positive and negative electrodes, which can be soldered onto the printed circuit board, but cannot be fixed to the structural components. In order to ensure the reliability of the battery after soldering, epoxy resin is used to bond the battery to the inside of the structural components.

[0043] The lithium battery 3 is soldered to the corresponding position of the power supply circuit board 2. Before soldering, the pins are trimmed, and after soldering, they are round solder joints. The solder joint area is covered with sealant. The sealant must cover all pins, and the surface must be flat, without burrs or tears. Excess sealant is removed.

[0044] Prepare a room-temperature epoxy resin adhesive using epoxy resin, dibutyl phthalate, and ethylenediamine in the specified mass ratio. Remove any excess adhesive after potting. The potting height should not exceed the height of the battery box component recess. Figure 4 The location shown.

[0045] Use conductive adhesive to attach the conductive rubber strip to the sealing groove 5 of the battery mounting box 1, ensuring that the interface of the conductive rubber strip is sealed.

[0046] This utility model provides an astronomical clock power supply battery box that is easy to manufacture and maintain. It comprises three parts: a power supply circuit, an energy storage circuit, and a battery mounting box. The power supply circuit provides the power required by the astronomical clock, while the energy storage circuit is designed to prevent momentary power outages during vibrations by selecting an appropriate energy storage method. The battery mounting box ensures convenient installation and maintenance. For field maintenance and replacement, only the four screws securing the battery box need to be removed to remove the entire battery box for replacement. No soldering is required during replacement. When the battery reaches the end of its lifespan, it does not need to be returned to the factory for repair, reducing the time required for field maintenance of the battery box components.

[0047] This invention features a wiring-free design for manufacturing and maintenance. Spring pins are mounted on the energy storage circuit board, and metallized pads are designed on the power supply circuit board. When the battery reaches the end of its lifespan, the entire power supply circuit board can be replaced without wiring or soldering. This invention also features a corrosion-resistant design for the metal pads. A sealing groove is provided on the battery box, fitted with a double-peak sealing strip. The inner ring prevents electromagnetic penetration, and the outer ring provides a seal, preventing external corrosive substances from entering the device. Furthermore, this invention has a power-loss protection design. The energy storage circuit board is designed to provide short-term power in case of momentary contact failure during vibration. It also features an error-proof design. The battery box mounting base has a notch, and the mounting panel has a boss, ensuring the battery box can be installed in a unique orientation. Finally, this invention has a short-circuit protection design. The metal pads and spring pins on the power supply circuit board have an asymmetrical structure, ensuring that the energy storage circuit board and the power supply circuit board will not short-circuit.

Claims

1. An astronomical clock power cell holder characterized by, The battery box comprises: non-extrusion screw (1), power supply circuit board (2), lithium battery (3), battery mounting box (4), sealing groove (5), power supply circuit board sealing groove (6), energy storage circuit board (9), product mounting panel (10); The lithium battery (3) is placed in the battery mounting box (4), the power supply circuit board (2) is fixed on the battery mounting box (4) by screw, the battery mounting box (4) is provided with battery box sealing groove (5), and the power supply circuit board (2) is provided with power supply circuit board sealing groove (6); the battery box sealing groove (5) and the power supply circuit board sealing groove (6) are respectively provided with sealing strips, so as to form a power supply circuit; The energy storage circuit board (9) is fixed on the product mounting panel (10), and the power supply circuit is fixed on the product mounting panel (10) by non-extrusion screw (1).

2. The battery box for astronomical clock of claim 1, wherein three welding holes are arranged on the power supply circuit board (2) for welding with the lithium battery (3).

3. The battery box for astronomical clock of claim 1, wherein a spring needle socket (8) is arranged on the energy storage circuit board (9), and two metal pads (7) are arranged on the top surface of the power supply circuit board (2) for contacting the spring needle socket (8) on the energy storage circuit board (9).

4. The battery box for astronomical clock of claim 1, wherein the power supply circuit board (2) is formed by bonding a reinforcing frame and a printed board, and the outer dimension is 62mm*17mm, and the power supply circuit board (2) is fixed on the battery mounting box (4) through four holes.

5. The battery box for astronomical clock of claim 1, wherein the energy storage circuit board (9) is formed by bonding an energy storage circuit reinforcing frame and an energy storage circuit printed board, and the outer dimension is 36mm*35mm, and the energy storage circuit board (9) is fixed on the product mounting panel (10) through four holes.

6. The battery box for astronomical clock of claim 4, wherein the lithium battery (3) is cylindrical, and the positive and negative electrodes are provided with welding pieces, which are welded on the printed board of the power supply circuit board (2), and the lithium battery (3) is bonded in the battery mounting box (4) by epoxy resin glue. ​ ​ ​ ​ ​

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