Mounting structure for surface film type heater of satellite storage battery structural component

Abstract

A surface film type heater mounting structure for a satellite storage battery structural member is characterized in that a convex outer frame surrounds the periphery of a storage battery structural member (1), a heater (2) with a film structure is adhered to the upper side of a bottom plate (11), and a lead (3) is led out from one end of the heater (2); the right-angle side dispensing (4), the wiring root dispensing (5) and the wiring dispensing (6) are formed by curing drop glue; the adhesive film layer (8) is coated on the bottom surface of the heater (2); the mounting structure is improved, the storage battery module is indirectly heated uniformly and accurately, the energy utilization efficiency of a satellite is effectively improved, and normal work of the storage battery is guaranteed. The heating process is easy to accurately control, safe and reliable, and has the functions of bending resistance, extrusion resistance and convenience in temperature detection. A vent hole structure does not need to be arranged, so that the defect of non-uniform heating distribution caused by the vent hole structure is avoided, and the risk caused by over-high local temperature due to over-large surface temperature difference of the heater is eliminated and avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of IPC classification H02J 7 / 00 auxiliary device for an electric energy storage system for supplying power to a load by a battery pack or H05B 3 / 00 ohm resistance heating, and in particular relates to an improved technology for an auxiliary heating structure for satellite batteries. Background Art

[0002] When the environment or the battery temperature is too low, the battery discharge time is shortened or even no current is output. Moreover, it is difficult to charge the battery, and the battery and the load it supplies may not work properly.

[0003] Therefore, in the existing technology, during the on-orbit operation of satellite batteries, in order to meet the battery power supply and charging needs, a battery auxiliary heating structure is usually set up to heat the battery pack to avoid seriously affecting the battery power supply and charging of the satellite when the temperature is low, so that the battery pack temperature reaches a reasonable temperature range.

[0004] As a continuously developing heating structure, patent application 202220898974.6 discloses a polyimide film etched chip battery heating plate, including a heating film chip, the bottom surface of the heating film chip is fixedly connected to the top surface of the first insulating film, the bottom surface of the first insulating film is fixedly bonded with double-sided tape, the top surface of the heating film chip is fixedly connected to the bottom surface of the second insulating film, the top surface of the second insulating film is fixedly provided with an anti-bending layer and a temperature sensor, the top surface of the anti-bending layer is fixedly connected to the bottom surface of the third insulating film, the top surface of the third insulating film is fixedly bonded with an anti-extrusion layer, one side of the first insulating film, the second insulating film and the third insulating film are all provided with a protrusion, the inner side of the protrusion is buried with one end of a wire protection tube, the other end of the wire protection tube is close to the side of the terminal, and the three-layer polyimide film safely isolates the anti-bending layer, temperature sensor, heating film chip and double-sided tape.

[0005] The technology related to the installation of heating bodies is also constantly improving. Taking lithium batteries as an example, a representative patent application, CN115513567, discloses a method for a whole-piece composite heating sheet and its lithium battery pack. In this method, the composite heating sheet contains an electric heating wire, a graphite film, polyimide and a vent hole. The composite heating sheet is directly glued to the side of a lithium battery pack in which multiple single cells are arranged, and a cross-line is provided between adjacent single cells corresponding to the composite heating sheet. Moreover, the gap formed between adjacent single cells and the heating sheet is not necessarily filled with silicone rubber, and exhaust is discharged by the vent hole provided on the heating sheet.

[0006] In this type of technical solution, the vent hole structure provides uneven heating distribution across the entire heater when powered, making accurate and stable control and operation difficult. Furthermore, the choice of a composite heater and its one-time installation by gluing it to the side of a lithium battery pack presents insulation and leakage risks. If multiple cells become misaligned under mechanical conditions, this can affect the heater's installation quality and heating effectiveness, potentially causing the composite heater to separate from the sidewalls of multiple cells in the lithium battery pack. Utility Model Content

[0007] The utility model is a technical requirement for solving the above-mentioned existing technical problems. It proposes a surface film heater installation structure for satellite battery structural parts. The battery structural parts are first heated by the bottom heater, and then the heat is transferred to the battery module through the thermal conductive glue on the inner surface of the structural parts, so that the heating body indirectly heats the battery module, and the heating is uniform and accurate, and the heating is safe and reliable.

[0008] To this end, the present invention includes a battery structure, a heater, and a conductive wire; the heater is a thin-film structure heater. The battery structure is surrounded by an upwardly convex outer frame, with an external via provided on at least one end of the outer frame. A base plate is provided in the middle of the frame, with a heater attached to the upper side of the base plate. The heater is provided with a heating resistor. The heater is attached to the upper side of the base plate within the outer frame. Glue is applied to the bottom of the four corners of the heater, forming right-angled edges. A conductive wire is led out from one end of the heater. A routing glue point is provided on the extended portion of the conductive wire. The connection between the conductive wire and the heating resistor in the heater is glued to form a connection point.

[0009] A grid-shaped inner frame is installed on the upper side of the bottom plate of the battery structure, i.e., within the outer frame. The inner frame has internal vias, and the heater is attached to the upper side of the bottom plate within the inner frame. The wires are passed through the internal vias and then the external vias to exit the battery structure. If multiple heaters need to be connected in series or parallel, the wires from the two heaters are connected through the internal vias.

[0010] The right-angle edge glue spotting, wiring root glue spotting, and routing glue spotting are formed by curing the drip glue; wherein, the routing glue spotting fixes and bonds the wire to the surface of the base plate; the wiring root glue spotting fixes and bonds the wire to the connection point of the resistor lead in the heater, the heater edge adjacent to the connection point, and the base plate surface below the connection point; the right-angle edge glue spotting extends along the two right-angle edges adjacent to the heater corner to form an L-shaped folded strip structure, and the inner edge of the right-angle edge glue spotting is pressed against the bottom surface of the heater corner, and the outer edge of the right-angle edge glue spotting overflows in a fold line shape outside the edge of the bottom surface of the heater corner and is slightly rolled up to form a rim around the outer wall of the heater corner.

[0011] The bottom surface of the heater is coated with a film layer, and in particular, the film layer has a thickness not exceeding 0.5 mm.

[0012] In particular, routing glue spots are evenly spaced at local positions where the wire extension section turns or is laid on a longer routing section.

[0013] In particular, the heating resistors embedded in the heater are buried parallel to the long side of the heater.

[0014] In particular, the edge of the heater is spaced at least 5 mm from the inner wall of the inner frame.

[0015] In particular, an insulation layer is provided on the outer surface of the heater, or between the bottom surface of the heater and the battery structure. The insulation layer has a thickness of 0.6-1.5 mm, a thermal conductivity coefficient lower than 0.045 W / mK, and a temperature resistance range of -80-1800°C.

[0016] In particular, the heater is a polyimide film heater, or a film-type silicone rubber heater.

[0017] Compared to the prior art, the present invention achieves the following beneficial effects: by installing and testing a film heater on the surface of a satellite battery structure, the installation structure is improved. When the heater is powered on, the surface temperature is uniform, eliminating the need for vent holes, thus avoiding the resulting uneven heating distribution and the risk of localized overheating caused by large temperature variations on the heater surface. Heat can be effectively transferred to the battery structure, and then to the battery module via the thermally conductive adhesive. While ensuring that onboard equipment remains within the normal temperature range, the management system autonomously adjusts the heater's heating timing and duration based on the satellite's energy status, providing uniform and accurate indirect heating of the battery module, effectively improving the satellite's energy efficiency and ensuring proper battery operation. This ensures stable heating of the battery throughout the entire process. The heating method is easy to precisely control, resulting in uniform, safe, and reliable heating. While safely and reliably heating satellite batteries, the heater is also resistant to bending and extrusion, and facilitates temperature monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the heater installation in an embodiment of the present utility model.

[0020] Figure 2 This is a top view of the heater installation structure in an embodiment of the present utility model.

[0021] Figure 3 for Figure 2 AA cross-section diagram in .

[0022] Figure 4This is a state diagram of the surface temperature change at different times after the heater is installed and powered on in Example 1.

[0023] Figure 5 This is a schematic diagram of the structure of installing an insulation layer on the outer surface of the heater in Example 2.

[0024] Figure 6 This is a schematic diagram of the structure of installing an insulation layer on the bottom surface of the heater in Example 2.

[0025] 1-battery structure, 2-heater, 3-wire, 4-right-angle edge glue spot, 5-connection root glue spot, 6-routing glue spot, 7-heating resistor, 8-film layer, 9-insulation layer; 11-base plate, 12-inner frame, 13-inner via, 14-outer via. DETAILED DESCRIPTION

[0026] Satellite battery heating optimization involves multiple aspects, including the application of multi-layer insulation materials, the use of thermal pads, the design of heat transfer plates, passive and active thermal control methods, charging optimization based on spatial information, and the application of intelligent thermal control systems. These methods and technologies together constitute a complete system for satellite battery heating optimization, providing reliable temperature assurance for satellites during on-orbit operation.

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

[0029] Example: Heater 2 is a rectangular polyimide composite ohmic resistance heating film, measuring 125 mm x 55 mm, with a resistance of 156 Ω. The installation and testing method for Heater 2 includes the following steps: cleaning; applying and scraping glue; attaching; flattening and removing bubbles; fixing; curing; removing excess material; testing; dispensing glue and curing. The test involves determining temperature differences between different parts of the heater and visual angle based on images displayed by an infrared thermal imaging thermometer.

[0030] In the embodiment of the present utility model, Figure 1 、 2As shown in Figures 3 and 4, the battery structure 1 is surrounded by an outer frame that is convex upwards, and an outer through-hole 14 is provided on at least one end of the outer frame. A bottom plate 11 is provided in the middle of the frame, and a heater 2 is pasted on the upper side of the bottom plate 11. A heating resistor 7 is provided in the heater 2. The heater 2 is pasted on the upper side of the bottom plate 11 inside the outer frame. The bottom of the four corners of the heater 2 are fixed with glue, that is, a right-angled glue 4 is formed, and two wires 3 are led out from one end of the heater 2. The connection parts of the two wires 3 and the heating resistor 7 in the heater 2 are fixed with glue, forming a connection root glue 5. Furthermore, the wires 3 pass through the inner through-hole 13 and the outer through-hole 14 in turn to connect to the battery structure 1; at the same time, when multiple heaters 2 need to be connected in series and parallel, the wires 3 respectively connected from the two heaters 2 are connected through the inner through-hole 13.

[0031] The routing glue spots 6 of the conductors 3 are evenly spaced at local positions arranged on turns or longer routing sections.

[0032] The bottom surface of the heater 2 is coated with a film layer 8 .

[0033] The heating resistor 7 embedded in the heater 2 is buried parallel to the long side direction.

[0034] Furthermore, a grid-shaped inner frame 12 is provided on the upper side of the bottom plate 11 of the battery structure 1 , i.e., inside the outer frame. The inner frame 12 has inner through holes 13 , and the heater 2 is attached to the upper side of the bottom plate 11 inside the inner frame 12 .

[0035] The distance between the edge of the heater 2 and the inner wall of the inner frame 12 is at least 5 mm.

[0036] In the embodiment of the present utility model, the right-angle edge glue 4, the wiring root glue 5, and the routing glue 6 are formed by curing the thermal conductive silicone glue. Among them, the routing glue 6 will be fixedly bonded to the surface of the base plate 11; the routing glue 6 is in the shape of an ellipsoid, a cone or a rectangular block. The wiring root glue 5 fixes and bonds the wire 3 to the connection point of the resistor lead in the heater 2, the edge of the heater 2 adjacent to the connection point, and the surface of the base plate 11 below the connection point. The right-angle edge glue 4 extends along the two right-angled edges adjacent to the corner of the heater 2 to form an L-shaped folded strip structure, and the inner edge of the right-angle edge glue 4 is pressed against the bottom surface of the corner of the heater 2, and the outer edge of the right-angle edge glue 4 overflows in a folded line shape outside the edge of the bottom surface of the corner of the heater 2 and is slightly rolled up to form a rim around the outer wall of the corner of the heater 2.

[0037] In the embodiment of the present invention, it is worth noting that, under certain working conditions, the adhesive film layer 8 may be made of thermally conductive insulating silicone, and the right-angle edge glue 4, the wiring root glue 5, and the routing glue 6 may be made of thermally insulating rubber.

[0038] In the embodiment of the present invention, the heater 2 is in a no-load state, a current of 0.2A is passed through the heater 2 for 5 minutes, and the surface temperature of the heater 2 is measured with an infrared thermal imaging thermometer. The result shows that when the heater 2 is not installed in the battery structure 1, that is, when it is exposed to the air environment, the surface temperature rises sharply, with the highest temperature reaching 174.6°C and the center temperature reaching 164.6°C. This is because the thermal conductivity of air is very low, and the heat of the heater 2 cannot be transferred to the air in time. Moreover, as the temperature gradually rises to 200°C, the middle adhesive layer of the polyimide film of the heater 2 begins to carbonize. As the heating time continues, the PI and adhesive film layers of the heater 2 gradually separate. When the temperature gradually rises to 300°C, the polyimide film of the heater 2 gradually carbonizes. The heater 2 is gradually damaged at high temperatures.

[0039] In the embodiment of the present utility model, Figure 4 As shown, after a polyimide film heater 2 was installed on a battery component 1, a 0.2A current was applied to the heater 2. Five minutes after power was applied, the measured surface temperature of the heater 2 showed a maximum surface temperature of 62.8°C and a center temperature of 61.6°C, with a temperature difference of 1.2°C. The surface heater 2 adhered well, and there were no noticeable bubbles between the heater 2 and the battery component 1. The overall image showed uniform brightness on the heater 2 surface, with no particularly bright spots or bright spots, further confirming the absence of noticeable bubbles between the heater 2 and the battery component 1, excellent adhesion, and satisfactory installation. The center and maximum surface temperatures of the heater 2 were measured at different power-on times. The figure shows that from the moment the heater 2 was powered on, the surface temperature increased with increasing power-on time. The difference between the center and maximum surface temperatures was less than 3°C, confirming good surface temperature uniformity, good adhesion, and satisfactory installation.

[0040] In the embodiment of the present invention, the polyimide film type heater, i.e., the polyimide composite ohmic resistance heating film, i.e., the polyimide film PI electric heating film, is formed by heat-sealing a polyimide film as the outer insulator and a metal foil or metal wire as the inner conductive heating element through high temperature and high pressure. The polyimide film electric heating film has excellent insulation strength, excellent electrical strength, excellent thermal conductivity efficiency, and excellent resistance stability. This makes it widely applicable to the heating field and can achieve a very high temperature control accuracy. The polyimide film electric heating film has been successfully used in the Fengyun series of artificial satellites, the Long March series of launch vehicles, the Dongfeng and Hongqi series of missiles, as well as the gyroscopes, accelerometers, fire control radars and other temperature control and heating systems of aircraft, ships, tanks, and artillery.

[0041] Furthermore, an expanded implementation of this embodiment includes heater 2 employing a membrane-type silicone rubber heater. Silicone rubber heaters (SCS) are also known as silicone rubber heating tapes, silicone rubber heating sheets, silicone rubber heating plates, silicone rubber heating films, and silicone rubber electric heating tapes. Silicone rubber heaters primarily consist of a nickel-chromium alloy heating wire and a silicone rubber high-temperature insulation layer. The silicone rubber high-temperature insulation layer is a composite of silicone rubber and fiberglass cloth, forming a thin sheet with a standard thickness of 1.5 mm. The silicone rubber heater offers excellent flexibility. The silicone heating sheet is highly flexible and allows for close contact with the heated object. The heating element is made of nickel alloy foil, achieving a heating power of up to 1.2 W / cm² for more uniform heating. They offer fast heating, uniform temperature, high thermal efficiency, high strength, ease of use, a safe lifespan of up to four years, and resistance to aging. They can be used in humid, non-explosive environments, for heating and heat preservation of industrial equipment pipelines, tanks, and barrels. They can be directly wrapped around the surface of the heated object. They can also serve as auxiliary heating for medical equipment, cryogenic protection, air conditioning compressors, and motors.

[0042] Furthermore, an expanded implementation of this embodiment also includes heater 2 employing an electric heating film structure, which is divided into high-temperature and low-temperature electric heating films. The low-temperature electric heating film is a translucent polyester film that generates heat when energized. It is made by processing a special conductive ink and a metal current-carrying strip between insulating polyester films and hot-pressing them. During operation, the electric heating film acts as the heating element, radiating heat into the space, warming people and objects first. The overall effect is superior to traditional convection heating methods. The low-temperature radiant electric heating film system consists of a power supply, a thermostat, connectors, an insulating layer, an electric heating film, and a finishing layer. The power supply is connected to the electric heating film via wires, converting electrical energy into thermal energy. Because the electric heating film is a purely resistive circuit, it has a high conversion efficiency. Except for a small 2% loss, the vast majority of the consumed electrical energy is converted into thermal energy.

[0043] In the embodiment of the present invention, the adhesive film layer 8 is formed by applying and curing thermally conductive adhesive, also known as thermally conductive silicone. This adhesive is primarily composed of organic silicone, with fillers, thermally conductive materials, and other polymeric materials added through mixing. It exhibits excellent thermal conductivity and electrical insulation properties and is widely used in electronic components. Also known as thermally conductive silicone, thermally conductive silicone rubber, thermally conductive silicone gel, and thermally conductive silicone gel. It uses an acrylate as a curing accelerator. It is used to bond transformers, transistors, and other heating components to printed circuit board assemblies or heat sinks.

[0044]

[0045] Example 2: As shown in the attached Figure 5As shown in Figure 6, in some working conditions where it is necessary to enhance the thermal insulation performance of at least a local area of ​​the battery structure 1 or the heater 2, an insulation film or coating is applied to the outer surface of the heater 2, or between the bottom surface of the heater 2 and the battery structure 1, to form an insulation layer 9. The insulation film or coating is made of a special solution, with nano-ceramic hollow particles, silicon aluminum fibers, and a variety of reflective materials as the main raw materials. The thermal conductivity coefficient is only 0.03W / mK, and the temperature range is -80-1800°C. It can effectively suppress and shield infrared radiation heat and heat conduction, and the heat insulation suppression efficiency can reach about 90%. It can suppress the heat radiation and heat loss of high-temperature objects, and can maintain 70% of indoor heat without loss. It can effectively keep low-temperature objects cold and suppress the loss of cold caused by environmental radiation heat, and prevent condensation.

[0046] In the embodiment of the present invention, the thickness of the adhesive film layer 8 ranges from 0.04mm to 0.2mm, and it is a cured hot-melt double-sided adhesive film structure. The thermal conductivity after curing reaches 1.1 to 1.5W / (m·k), and it can be used continuously at -60 to 280°C while maintaining performance.

[0047] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on this application. In this application, unless otherwise expressly specified and limited, terms such as "installed", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection.

[0048] The present invention further illustrates the technical solutions through the above embodiments. However, it should be noted that the present invention should not be mistakenly considered to be limited to these embodiments. In the technical field to which the present invention belongs, ordinary technicians may easily come up with several simple deductions or replacement technical solutions without departing from the overall concept of the present invention and without inventive work. Such solutions should be considered to fall within the scope of protection defined by the claims submitted for the present invention.

Claims

1. The surface film type heater installation structure of satellite battery structural parts is characterized by: The invention comprises a battery structure (1), a heater (2) and a wire (3); the battery structure (1) is surrounded by an outer frame with an upward protrusion, an outer through hole (14) is provided on at least one end of the outer frame, a bottom plate (11) is provided in the middle of the frame, a heater (2) with a thin film structure is adhered on the upper side of the bottom plate (11), a heating resistor (7) is provided in the heater (2), the heater (2) is adhered to the upper side of the bottom plate (11) in the outer frame, the bottom of the four corners of the heater (2) are fixed by glue, i.e., right-angled glue (4), and the wire (3) is led out from one end of the heater (2); a routing glue (6) is provided on the extension section of the wire (3); the connection part between the wire (3) and the heating resistor (7) in the heater (2) is fixed by glue, forming a wiring root glue (5).

2. The satellite battery structural component surface film type heater mounting structure according to claim 1, characterized in that: A grid-shaped inner frame (12) is provided on the upper side of the bottom plate (11) of the battery structure (1), i.e., within the outer frame. The inner frame (12) has an inner through hole (13). The heater (2) is attached to the upper side of the bottom plate (11) within the inner frame (12). The wire (3) passes through the inner through hole (13) and the outer through hole (14) in sequence to be connected to the battery structure (1). At the same time, when multiple heaters (2) need to be connected in series or parallel, the wires (3) respectively connected from two heaters (2) pass through the inner through hole (13) to be connected.

3. The satellite battery structural component surface film type heater installation structure according to claim 1, characterized in that: The right-angled edge glue (4), the wiring root glue (5), and the routing glue (6) are formed by curing the drip glue; wherein, the routing glue (6) fixes and bonds the wire (3) to the surface of the base plate (11); the wiring root glue (5) fixes and bonds the wire (3) to the connection point of the resistor lead wire in the heater (2), the edge of the heater (2) adjacent to the connection point, and the surface of the base plate (11) below the connection point; the right-angled edge glue (4) extends along two right-angled edges adjacent to the corner of the heater (2) to form an L-shaped folded strip structure, and the inner edge of the right-angled edge glue (4) is pressed against the bottom surface of the corner of the heater (2), and the outer edge of the right-angled edge glue (4) overflows in a folded line shape outside the edge of the bottom surface of the corner of the heater (2) and is slightly rolled up to form an edge covering the outer wall of the corner of the heater (2).

4. The satellite battery structural component surface film type heater mounting structure according to claim 1, characterized in that: The bottom surface of the heater (2) is coated with a film layer (8); the thickness of the film layer (8) does not exceed 0.5 mm.

5. The satellite battery structural component surface film type heater mounting structure according to claim 1, characterized in that: Routing glue spots (6) are evenly spaced at local positions arranged at turns on the extension section of the conductor (3) or on a longer routing section.

6. The satellite battery structural component surface film type heater mounting structure according to claim 1, characterized in that: The heating resistor (7) embedded in the heater (2) is buried parallel to the long side direction of the heater (2).

7. The satellite battery structural component surface film type heater mounting structure according to claim 1, characterized in that: The distance between the edge of the heater (2) and the inner wall of the inner frame (12) is at least 5 mm.

8. The satellite battery structural component surface film type heater mounting structure according to claim 1, characterized in that: A heat-insulating layer (9) is provided on the outer surface of the heater (2), or between the bottom surface of the heater (2) and the battery structure (1); the heat-insulating layer (9) has a thickness of 0.6-1.5 mm, a thermal conductivity coefficient lower than 0.045 W / mK, and a temperature resistance range of -80-1800°C.

9. The satellite battery structural component surface film type heater mounting structure according to claim 1, characterized in that: The heater (2) is a polyimide film heater.

10. The satellite battery structural component surface film type heater mounting structure according to claim 1, characterized in that: The heater (2) is a membrane-type silicone rubber heater.

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