A fixing device and fixing assembly mode of a hot battery electric ignition head

Abstract

The present application relates to a kind of electric ignition head fixing device for thermal battery and fixing assembly mode, with a rigid fixing plug, ignition head is fixed in the central fan-shaped hole, two foot lines pass through the hole of fan-shaped side and the edge hole of fixing plug, so that ignition head is embedded in fixed plate.The ignition head fixed by using fixing plug is called ignition body, and the ignition body can be placed at the bottom of thermal battery shell, after electric ignition head is activated, flame is transmitted from bottom to top, the size of fixing plug is same with the inner diameter of thermal battery shell, and the two foot lines of electric ignition head are led out along shell wall and then are led out through the flow guide hole of cover plate.In order to prevent short circuit between foot line and shell and electric pile, foot line is led out from the middle of insulation layer of shell and insulation layer of electric pile.The thermal battery assembled by using the electric ignition head fixing mode avoids the hidden danger that foot line of electric ignition head is wound on nickel lead and cut off, and in the process of being pressed, electric ignition head is protected by rigid fixing plug, avoids extrusion damage, and activation time is faster than thermal battery of same type.

Description

Technical Field

[0001] This invention relates to a fixing device and fixing assembly method for an electric ignition head for a thermal battery, belonging to the field of pyrotechnics and power supply technology. Background Technology

[0002] The electric igniter is a crucial ignition element in a thermal battery. It is through the action of the electric igniter that the thermal battery is activated and put into working condition. Currently, the most common method for fixing and assembling the electric igniter is to wrap the two leads of the electric igniter around the welding lead wire of the guide column at the input end of the cover. The lead wire wraps around and fixes the electric igniter. Three to four layers of perforated insulating elements are passed through the lead wire at the output end of the cover, so that the end of the electric igniter (diameter Φ2.8mm) is located in the central hole of the insulating element. The electric igniter transmits ignition through the central hole, igniting the internal heating system of the thermal battery, thereby enabling the thermal battery to reach the working environment temperature.

[0003] The existing electric ignition head fixing method has the following main drawbacks:

[0004] (1) The electric ignition head is fixed by wrapping two leads around the nickel lead wire at the input end of the cover. The lead wire diameter of the electric ignition head is Φ0.28mm. The nickel lead wire is made of nickel strip with a thickness of 0.12mm and a width of 2.0mm. There are burrs and sharp edges on its edges. When the lead wire of the electric ignition head is wrapped around the nickel lead wire, it is easy to cut the lead wire, which will cause the electric ignition head to break the circuit and ultimately cause the thermal battery to fail.

[0005] (2) During the assembly of the thermal battery, the shell and cover body need to be welded together by pre-pressing the seam. Since the diameter of the electric ignition head is Φ2.8mm, in order to protect the electric ignition head from damage due to pressure during the pre-pressing process, after the electric ignition head is wound around the nickel lead wire, it is necessary to pass through 3 to 4 layers of 1.0mm thick perforated insulating elements so that the electric ignition head is located in the center hole of the insulating element. Therefore, when designing the longitudinal diameter of the thermal battery, the thickness of the insulating element needs to be reserved, which reduces the effective height of the thermal battery in the longitudinal design and reduces the design capacity of the thermal battery. At the same time, the insulating element is a non-rigid design. If the pre-pressing pressure is too high, the compressibility of the insulating element will increase, and the electric ignition head may be damaged by pressure.

[0006] (3) Existing electric ignition heads are generally fixed at the top of the fuel cell stack. When the input end of the cover receives input energy, the electric ignition head is activated. The electric ignition head transmits flame downwards to ignite the ignition element in the thermal battery. The ignition element transmits flame from top to bottom to ignite the heating system of the thermal battery, thereby enabling the thermal battery to reach the working environment temperature and start outputting voltage. During this process, the flame transmission of the electric ignition head and the ignition element is from top to bottom, which slows down the flame transmission speed and prolongs the activation time of the thermal battery. Summary of the Invention

[0007] The purpose of this invention is to provide a method for fixing and assembling an electric ignition head for a thermal battery, which avoids the electric ignition head from being cut due to being wrapped around the nickel lead wire, while accelerating the ignition speed of the thermal battery, increasing the activation time of the thermal battery, preventing the electric ignition head of the thermal battery from being squeezed and damaged, and improving the reliability of the thermal battery.

[0008] This invention is achieved through the following technical solutions:

[0009] A device for fixing an electric ignition head for a thermal battery is disclosed. The device is a rigid circular fixing plug. The center of the fixing plug has a hollow formed by a combination of rectangles and fan shapes. The fan shapes radiate towards the edge of the fixing plug. The top and side walls of the rectangular hollow have through holes that are perpendicular to each other along the radial direction of the fixing plug. The end of the through holes is a notch on the circumference of the fixing plug. The diameter of the fixing plug is the same as the inner diameter of the thermal battery shell. The depth of the notch on the circumference of the fixing plug is greater than the thickness of the thermal battery shell.

[0010] There is a chamfered edge (R) at the end of the fixed plug hole.

[0011] The retainer is made of reinforced membrane plastic.

[0012] The thickness of the fixing plug is 4.0 mm.

[0013] The width of the rectangular cutout in the center of the fixing plug is 4.0mm.

[0014] The fixed plug has a fan-shaped hollowed-out arc of 90°.

[0015] A method for fixing and assembling an electric ignition head for a thermal battery involves using a rigid fixing plug to fix the ignition head to the center of the fixing plug's hollow core. Two leads pass through holes on the side of the hollow core and through the edge holes of the fixing plug, thus embedding the electric ignition head into the fixing plate. At this point, the two leads of the electric ignition head are vertically bent, and the two leads of the electric ignition head are led out along the shell wall and then through the guide holes on the cover plate to connect to the input end.

[0016] To prevent short circuits between the lead wires and the casing and fuel cell stack, the lead wires pass through the space between the insulation layer of the thermal battery casing and the insulation layer of the fuel cell stack.

[0017] The thermal battery assembled using the aforementioned electric ignition head fixing method avoids the risk of the electric ignition head lead wire getting tangled in the nickel lead wire and being cut. Furthermore, during the pressure process, the electric ignition head is protected by a rigid fixing plug to prevent damage from compression. After the thermal battery is activated, the voltage-time curve is monitored, and the activation time is faster than that of similar thermal batteries. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the rigid fixing plug structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the electric ignition head of the present invention being fixed in the fixing plug;

[0020] Figure 3 This is a schematic diagram of the assembly method of the ignition body of the present invention in a thermal battery. Detailed Implementation

[0021] like Figure 1 As shown, the electric ignition head retainer is made of reinforced film plastic with an outer diameter of Φ12mm and a thickness of 4.0mm. There is a hollow formed by a combination of rectangle and fan shape 2mm from the center. The arc of the fan shape is 90°. There are two through holes along the edge of the retainer's hollow. There is an R-shaped chamfer at the through hole to prevent the two leads of the electric ignition head from being squeezed by the shell wall after passing through the through hole.

[0022] like Figure 2 As shown, the electric ignition head is placed in the fan-shaped hollow of the fixed plug opening, and the two leads of the electric ignition head pass through the through hole and bend upward at 90°.

[0023] The ignition head that is fixed in place by a retaining plug is called the ignition body, such as Figure 3 As shown, the ignition element is mounted at the bottom of the thermal battery housing. The thermal battery has an outer diameter of φ13mm and a height of 20mm. After the electric ignition head is activated, the flame is transmitted from bottom to top. The diameter of the fixing plug is the same as the inner diameter of the housing. The two leads of the electric ignition head are led out along the housing wall and pass through the guide holes on the cover plate. To prevent the leads from short-circuiting with the housing and the fuel cell stack, the leads pass through the middle of the insulation layer of the housing and the insulation layer of the fuel cell stack, serving as the input terminal of the thermal battery.

[0024] The advantages and positive effects of this invention are:

[0025] (1) The two leads of the electric ignition head are directly fixed in the hollow of the fixing plug, avoiding entanglement on the nickel lead wire and causing cuts, thus improving the reliability of electric ignition.

[0026] (2) The electric ignition head and the fixing plug are fixed to the bottom of the thermal battery. When the electric ignition head is activated, the flame is transmitted upward to the fuel cell. The flame is transmitted from bottom to top, which improves the flame transmission speed and shortens the activation time of the thermal battery. This type of fixing method can be used for thermal batteries that require faster activation time.

[0027] (3) Since the electric ignition head is not fixed on the nickel lead wire of the cover, the nickel lead wire is no longer welded to the input end guide column on the cover. This also avoids the risk of the nickel lead wire not being firmly welded, false welding, or poor welding. At the same time, there is no need to reserve space on the cover for the insulating components used to protect the ignition head.

[0028] (4) Use a rigid fixing plate to fix the ignition head to prevent the ignition head from being damaged by excessive force. In the traditional fixing method, insulating elements are used to protect the electric ignition head. However, the insulating elements have a certain elasticity. When the pressure is too high, the thickness of the insulating element after compression is less than the diameter of the ignition head, and the electric ignition head will be squeezed and damaged. Fixing the ignition head with a rigid fixing plug avoids this hidden danger.

Claims

1. A device for fixing an electric ignition head for a thermal battery, characterized in that: The device is a rigid circular fixed plug with a hollowed-out area at the center formed by a combination of rectangles and fan shapes. The fan shapes radiate towards the edge of the fixed plug. The top and side walls of the rectangular hollowed-out area have mutually perpendicular through holes along the radial direction of the fixed plug. The end of the through holes is a notch on the circumference of the fixed plug. The diameter of the fixed plug is the same as the inner diameter of the thermal battery casing, and the depth of the notch on the circumference of the fixed plug is greater than the thickness of the thermal battery casing.

2. The electric ignition head fixing device for a thermal battery according to claim 1, characterized in that: There is a chamfered edge (R) at the end of the fixed plug hole.

3. The electric ignition head fixing device for a thermal battery according to claim 1, characterized in that: The retainer is made of reinforced membrane plastic.

4. The electric ignition head fixing device for a thermal battery according to claim 1, characterized in that: The thickness of the fixing plug is 4.0 mm.

5. The electric ignition head fixing device for a thermal battery according to claim 1, characterized in that: The width of the rectangular cutout in the center of the fixing plug is 4.0mm.

6. The electric ignition head fixing device for a thermal battery according to claim 1, characterized in that: The fixed plug has a fan-shaped cutout with an arc of 90°.

7. A method for fixing and assembling an electric ignition head for a thermal battery using the electric ignition head fixing device as described in any one of claims 1-6, characterized in that: The rigid fixing plug secures the electric ignition head to the center of the fixing plug's hollow core. The two leads pass through the through holes on the side of the hollow core and through the notches around the circumference of the fixing plug, thus embedding the electric ignition head inside the fixing plug. At this point, the two leads of the electric ignition head are bent vertically and led out along the wall of the thermal battery casing, then through the guide holes on the cover plate and connected to the input end.

8. The method for fixing and assembling an electric ignition head for a thermal battery according to claim 7, characterized in that: To prevent short circuits between the lead wires and the casing and fuel cell stack, the lead wires pass through the space between the insulation layer of the thermal battery casing and the insulation layer of the fuel cell stack.

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