An unattended power supply system capable of autonomous charging

Abstract

This invention proposes an unattended power supply system capable of autonomous charging, comprising a structural module, a lithium-ion battery module, a lithium-ion battery module, and a control module. The control module monitors the electrical performance of the lithium-ion battery through an internal monitoring program, and a microcontroller controls the start and stop of charging of the lithium-ion battery pack by the lithium-ion battery module. In this power supply system, the lithium-ion battery is the main power supply unit, and the lithium-ion battery is its auxiliary power supply. The two are integrated into one unit through the control module and the structural module, enabling the power system to operate for extended periods. The lithium-ion battery continuously dissipates heat during operation, providing insulation for the lithium-ion battery at low temperatures, thereby widening the operating temperature range of the power system and further improving its performance. This power system has a built-in charging function, can operate unattended, and can be used as an emergency power source in remote areas without charging facilities.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery design technology, specifically relating to an unattended power system that integrates a lithium secondary battery, a lithium thermal battery, and a control module and can be autonomously charged. Background Technology

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. They are divided into two main categories: non-rechargeable and rechargeable. Non-rechargeable lithium batteries are called primary lithium batteries, which can only convert chemical energy into electrical energy once and cannot convert electrical energy back into chemical energy, such as the lithium thermal battery involved in this invention. Rechargeable lithium batteries are called secondary lithium batteries, which can convert electrical energy into chemical energy for storage and then convert chemical energy back into electrical energy when in use, such as the rechargeable lithium-ion battery involved in this invention.

[0003] Lithium-ion thermal batteries are the most representative type of disposable lithium batteries. They are thermally activated disposable lithium batteries that use their own heating system to heat and melt a non-conductive solid salt electrolyte into an ionic conductor, thus entering the working state. They have a fully sealed structure. Lithium-ion thermal batteries operate at high temperatures, with internal temperatures typically exceeding 550°C. Through heat conduction, the surface temperature of the battery can reach 200°C to 400°C. They are characterized by high reliability, long storage time, rapid activation, and a wide operating temperature range (-55°C to +75°C). However, lithium-ion thermal batteries are disposable and do not have standby functionality, nor can they provide power for extended periods.

[0004] Lithium-ion batteries utilize the reversibility of chemical reactions, allowing for repeated use. They offer advantages such as structural stability, low self-discharge rate, long storage life, fast charging, and long cycle life. However, in remote mountainous areas or low-temperature conditions, the conductivity of key battery materials such as the cathode and electrolyte decreases, causing the lithium-ion battery to malfunction. This significantly reduces its output capacity and limits its operating temperature, typically from 0℃ to 45℃. Frequent individual charging of the lithium-ion battery is required during use, impacting its lifespan. Currently, external heating films, heating wires, or other heating methods are used to heat lithium-ion batteries to meet low-temperature operating requirements. However, these methods have relatively complex designs, demanding high precision in heating design and heat generation control. During use, close proximity to individual lithium-ion battery cells necessitates stringent requirements on the cell packaging. Furthermore, prolonged operation may accelerate lithium-ion battery aging, affecting its capacity and lifespan. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] This invention proposes an unattended power supply system that can recharge autonomously. It introduces a power control module and integrates lithium thermal batteries with lithium-ion batteries to solve the technical problem that it is insufficient as a power source alone, and achieves long-term, unattended, and low-temperature-resistant operation.

[0007] (II) Technical Solution

[0008] To address the aforementioned technical problems, this invention proposes an unattended power supply system capable of autonomous charging. This unattended power supply system includes a structural module, a lithium-ion battery module, a lithium-ion battery module, and a control module; wherein...

[0009] The structural module includes a lower cover plate, a skin, and an upper cover plate; among them, four skins form a rectangular cavity, and the upper cover plate, lower cover plate, and skin are fixedly connected to form the structural cavity, and a lithium thermal battery module, a lithium-ion battery module, and a control module are fixed and integrated inside the cavity.

[0010] The lithium-ion battery module consists of multiple lithium-ion batteries; each lithium-ion battery includes a battery pack cover, a battery casing, and a battery stack; the battery stack is installed in the battery casing, and the battery pack cover is installed on top of the battery casing; the battery pack cover includes gaskets, two S-terminals for the activation circuit, a positive output terminal, a negative output terminal, and the battery cover itself; the battery cover and each terminal are a single structure, with the terminals evenly distributed on the battery cover, and the gaskets are fixed and cover the upper part of the battery cover and each terminal; the battery stack includes baffles, ignition components, individual battery modules, insulation elements, electrode leads, and fasteners. The components include: baffles located on the outermost sides of the stack at both ends, protecting the stack; ignition components located on both sides of the stack, with their upper and lower parts flush with the end faces of the stack, serving to transfer ignition; individual battery modules comprising multiple individual batteries located in the middle of the stack; insulation elements located at the top and bottom of the stack, symmetrically fixed between the baffles and individual battery modules; electrode leads connected to the leads corresponding to the positive and negative output terminals, forming a discharge path; and fastening elements that wind the various components of the stack together to form a single unit.

[0011] The lithium-ion battery module includes a lithium-ion battery pack casing, a lithium-ion battery pack, a lithium-ion battery charging cable, and a lithium-ion battery discharging cable. The lithium-ion battery pack casing has two through holes at each end of its bottom for easy connection to the structural module. The lithium-ion battery pack is composed of multiple individual cells connected in series and parallel. The lithium-ion battery charging cable and lithium-ion battery discharging cable are located at opposite ends of the top of the lithium-ion battery pack, serving as the input and output interfaces for charging and discharging the battery pack. These two cables are independent and not co-located.

[0012] The control module is installed on top of the lithium-ion battery pack. Its input cable is connected to the lithium-ion battery discharge cable, and its output cable is connected to the activation circuit formed by the two S-terminals in the lithium-ion battery module, as well as other electrical loads. The positive and negative output terminals of the lithium-ion battery module are connected to the lithium-ion battery charging cable via the control module. The control module monitors the electrical performance of the lithium-ion battery through its internal monitoring program and provides real-time feedback to the microcontroller. When the monitoring program detects that the lithium-ion battery pack's charge level is below a certain threshold, the microcontroller issues a charging command. The activation program within the control module, upon receiving the charging command,... Upon receiving an electrical command, the lithium-ion battery module is activated. One of the lithium-ion batteries in the module outputs electrical energy, which is then used by the DC / DC converter and charger inside the control module to charge the lithium-ion battery pack with a certain current. When the energy of a single lithium-ion battery is insufficient or its voltage is lower than a certain value, the next lithium-ion battery is activated, and so on, to charge the lithium-ion battery pack. When the monitoring program detects that the lithium-ion battery pack has reached or is close to full charge, the microcontroller issues a command to provide trickle charging or stop charging, cutting off the charging process. The lithium-ion batteries then output electrical energy under no-load conditions, continuously heating the lithium-ion battery pack through the surface temperature of the lithium-ion batteries.

[0013] Furthermore, the lower cover, skin, and upper cover are made of titanium, aluminum and their alloys, or stainless steel.

[0014] Furthermore, the power switch and status monitoring display are both fixedly mounted on the outside of the skin. The power switch serves as the start / stop button for the entire power system, and the status monitoring display is used to display the capacity or voltage of the internal lithium-ion battery, as well as the ignition head resistance and insulation resistance between the electrodes of the lithium thermal battery.

[0015] Furthermore, the skin is also equipped with electrical connector plugs or sockets as output ports. The power system outputs to the outside through the output ports, realizing the air, heat and structural isolation between the internal components of the power system and the outside world.

[0016] Furthermore, the battery cover and each terminal are integrated by high-temperature melting and solidification sintering of glass powder.

[0017] Furthermore, silicone rubber is used to fill the space between the gasket and each terminal.

[0018] Furthermore, the combined battery case is integrally formed by the battery case and two support ears; the two support ears are positioned opposite each other at both ends of the battery case, and the lower end faces of the two support ears are flush with the bottom of the battery case. The support ears have circular through holes machined inside for installation and connection with other components.

[0019] Furthermore, the stack includes two sets of individual battery modules, which are connected in parallel via electrode leads.

[0020] Furthermore, high-temperature resistant tape is used for fastening components.

[0021] Furthermore, the single cell has a four-in-one structure consisting of a heating agent layer, a positive electrode layer, an electrolyte layer, and a negative electrode layer, arranged from bottom to top.

[0022] (III) Beneficial Effects

[0023] This invention proposes an unattended power supply system capable of autonomous charging, comprising a structural module, a lithium-ion battery module, a lithium-ion battery module, and a control module. The control module monitors the electrical performance of the lithium-ion battery through an internal monitoring program, and a microcontroller controls the start and stop of charging of the lithium-ion battery pack by the lithium-ion battery module. In this power supply system, the lithium-ion battery is the main power supply unit, and the lithium-ion battery is its auxiliary power supply. The two are integrated into one unit through the control module and the structural module, enabling the power system to operate for extended periods. The lithium-ion battery continuously dissipates heat during operation, providing insulation for the lithium-ion battery at low temperatures, thereby widening the operating temperature range of the power system and further improving its performance. This power system has a built-in charging function, can operate unattended, and can be used as an emergency power source in remote areas without charging facilities. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the power supply system according to an embodiment of the present invention.

[0025] Figure 2 This is a three-dimensional structural schematic diagram of the power supply system according to an embodiment of the present invention (excluding the top cover plate);

[0026] Figure 3 This is a three-dimensional structural schematic diagram of the power supply system from the right side according to an embodiment of the present invention;

[0027] Figure 4 This is a top-view three-dimensional structural schematic diagram of the power supply system according to an embodiment of the present invention (excluding the top cover plate);

[0028] Figure 5 This is a top-view three-dimensional structural diagram of the lithium thermal battery in an embodiment of the present invention;

[0029] Figure 6 This is a three-dimensional structural diagram of the lithium-ion battery in an embodiment of the present invention.

[0030] Figure 7 This is a three-dimensional triaxial view of the lithium-ion battery stack in an embodiment of the present invention.

[0031] Figure 8 This is a three-dimensional structural diagram of the lithium secondary battery and control module in the embodiment of the present invention.

[0032] In the diagram, 1-lower cover plate; 2-skin; 3-upper cover plate; 4-lithium thermal battery module; 5-control module; 6-lithium-ion battery module; 7-output port; 8-status monitoring display; 9-power switch; 10-input cable; 11-output cable; 201-screw hole; 202-screw; 401-washer; 402-S terminal (activation); 403-positive output terminal; 404-negative output terminal; 405-support; 406-battery casing; 407-battery cover; 408-baffle; 409-ignition assembly; 410-single battery cell; 411-insulation element; 412-terminal lead wire; 413-fastening element; 601-lithium-ion battery pack casing; 602-lithium-ion battery pack; 603-lithium-ion battery input cable; 604-lithium-ion battery output cable. (Note: The dimensions of the front and rear sides, and left and right sides of the skin are completely consistent, unless otherwise specified in the diagram.) Detailed Implementation

[0033] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0034] This embodiment proposes an unattended power supply system capable of autonomous charging, the composition of which is as follows: Figure 1-4 As shown, it mainly includes a structural module, a lithium thermal battery module 4, a lithium-ion battery module 6, and a control module 5.

[0035] The structural module mainly includes a lower cover plate 1, a skin 2, and an upper cover plate 3. The four skins 2 form a rectangular cavity with a length × width × height of 250mm × 150mm × 120mm. Multiple screw holes 201 are machined on the skins 2. The upper cover plate 3, lower cover plate 1, and skins 2 are fixedly connected by stainless steel screws 202 to form the structural cavity. Inside the cavity, the lithium-ion battery module 4, lithium-ion battery module 6, and control module 5 are fixed and integrated using screws 202.

[0036] The lower cover plate 1, skin 2, and upper cover plate 3 can be made of titanium, aluminum and their alloys, or stainless steel. In this embodiment, the lower cover plate 1, skin 2, and upper cover plate 3 are all made of hard aluminum alloy sheet, and the surface is anodized to black. The length × width × height of the lower cover plate 1 and the upper cover plate 3 are both 250mm × 150mm × 20mm.

[0037] Both the power switch 9 and the status monitoring display 8 are fixedly mounted on the outside of the skin 2. The power switch 9 serves as the start / stop button for the entire power system, while the status monitoring display 8 displays the capacity or voltage of the internal lithium-ion battery, as well as the ignition head resistance and insulation resistance between the electrodes of the lithium-ion battery. In addition, the skin 2 is also equipped with an electrical connector plug or socket as an output port 7. The power system outputs to the outside through the output port 7, achieving air, heat, and structural isolation between the internal components of the power system and the external environment.

[0038] The lithium-ion battery module 4 consists of four lithium-ion batteries, which can be electrically activated by an electric ignition head or activated by an internal mechanical mechanism through impact or needle puncture of the ignition cap. For example... Figure 5-7 As shown, a lithium thermal battery mainly consists of a battery cover, a battery casing, and a battery stack.

[0039] The combined battery cover includes a gasket 401, two S-terminals 402 for the activation circuit, a positive output terminal 403, a negative output terminal 404, and a battery cover 407. In this embodiment, the battery cover 407 has dimensions of φ48mm × 3mm. The battery cover 407 and each terminal are integrally formed by high-temperature melting and solidification sintering of special glass powder. Each terminal is evenly distributed on a φ20mm circumference inside the battery cover 407. The gasket 401 is fixed and covers the upper part of the battery cover 407 and each terminal. 704 silicone rubber is filled between the gasket 401 and each terminal to fix the connecting wires and to provide insulation and protection.

[0040] The battery housing is integrally formed from a battery housing 406 and two lugs 405. In this embodiment, the battery housing 406 has dimensions of φ50mm×80mm×1mm. The two lugs 405 are positioned opposite each other at both ends of the battery housing 406, with their lower ends flush with the bottom of the battery housing 406. Each lug measures 10mm×8mm×2mm and has a φ5mm circular through-hole machined inside for easy connection and installation with other components.

[0041] The fuel cell stack includes two baffles 408, two ignition components 409, two sets of individual battery modules, insulation elements 411, two electrode leads 412, and fastening elements 413. The two baffles 408 are located on the outermost sides of the upper and lower ends of the fuel cell stack, serving to protect it. The two ignition components 409 are located on both sides of the fuel cell stack, with an angle of approximately 90 degrees between them. The upper and lower parts of the ignition components 409 are flush with the end faces of the fuel cell stack, serving to transfer ignition. Each set of individual battery modules includes 16 individual batteries 410, stacked in the middle of the fuel cell stack and connected in parallel via electrode leads 412. The insulation elements 411 are located at the upper and lower parts of the fuel cell stack, symmetrically fixed between the baffles 408 and the individual battery modules, serving to insulate the temperature. The electrode leads 412 are connected to the leads corresponding to the positive output terminal 403 and the negative output terminal 404, respectively, according to their positive and negative polarities, thus forming a discharge path. Finally, the components of the combined fuel cell stack are secured together as a whole by wrapping them together with fastening element 413. In this embodiment, the fastening element 413 is a high-temperature resistant tape with a width of 5mm or 10mm.

[0042] The specific dimensions and quantity of each component in the combined fuel cell stack can be designed and adjusted as needed. A reference can be made that the output voltage of the lithium-ion battery is approximately 10V higher than the nominal voltage of the lithium-ion battery, and the current output value meets the 1C rate requirement for the lithium-ion battery. In this embodiment, the baffle 408 has dimensions of φ44mm × 1mm, the ignition assembly 409 has dimensions of 5mm × 100mm, and the individual battery 410, from bottom to top, is a four-in-one structure integrating a heating agent layer, a positive electrode layer, an electrolyte layer, and a negative electrode layer, with dimensions of φ44mm × 2mm, an open-circuit voltage of approximately 32V, and can stably output a current of 10A for charging the lithium-ion batteries in the lithium-ion battery module 6.

[0043] The lithium-ion battery module 6 mainly includes a lithium-ion battery pack casing 601, a lithium-ion battery pack 602, a lithium-ion battery charging cable 603, and a lithium-ion battery discharging cable 604, such as... Figure 8As shown. The lithium-ion battery pack casing 601 is made of aluminum alloy with a thickness of 1mm. Two φ5mm through holes are machined at each end of the bottom for easy connection to the structural module. The lithium-ion battery pack 602 consists of at least two 6S1P single cells connected in series and parallel. The battery pack contains a protection board with overcurrent, overvoltage, over-discharge, overcharge, overtemperature, and short-circuit protection functions. The lithium-ion battery charging cable 603 and lithium-ion battery discharging cable 604 are located at the top ends of the lithium-ion battery pack 602, serving as the input and output interfaces for charging and discharging. They are independent and not co-wired, using 16# red and black silicone wires. In this embodiment, a GRP9564159-25C-22.2V 10000mAh battery is selected.

[0044] The lithium-ion battery pack 602 of the lithium-ion battery module 6 is fixed to the lower cover plate 1 of the structural module by screws, while the control module 5 is installed on the upper part of the lithium-ion battery pack 602.

[0045] The core of control module 5 is a microcontroller, specifically the STC15W408AS model in this embodiment. The input cable of control module 5 is connected to the lithium-ion battery discharge cable 604 of lithium-ion battery module 6, and the output cable of control module 5 is connected to the activation circuit formed by the two S terminals 402 in lithium-thermal battery module 4, as well as other electrical loads. The positive output terminal 403 and negative output terminal 404 of lithium-thermal battery module 4 are connected to the lithium-ion battery charging cable 603 via control module 5.

[0046] The control module 5 monitors the electrical performance (capacity or voltage) of the lithium-ion battery through its internal monitoring program and feeds back the data to the microcontroller in real time. The specific values ​​are displayed on the panel of the status monitoring display 8. Specifically, when the monitoring program detects that the charge level of the lithium-ion battery pack 602 is below a certain value (e.g., 50% or 70%), the microcontroller issues a charging command. Upon receiving the charging command, the activation program inside the control module 5 activates the lithium-ion battery module 4. One of the lithium-ion batteries in the lithium-ion battery module 4 outputs electrical energy, which is then charged to the lithium-ion battery pack 602 at a certain current value (charging rate not exceeding 1C, adjustable) through the DC / DC converter and charger inside the control module 5. When the energy of a single lithium-ion battery is insufficient or its voltage is below a certain value (e.g., a set lower voltage limit of 21V or a capacity of 30%), the next lithium-ion battery is activated, and so on, charging the lithium-ion battery pack 602.

[0047] When the monitoring program detects that the lithium-ion battery pack 602 has reached or is close to full charge (95% or 100%), the microcontroller issues a command to perform trickle charging or stop charging, cutting off the charging process. The lithium-ion battery then outputs electrical energy under no-load conditions. At this time, the surface temperature of the lithium-ion battery is 100℃~400℃, which can continuously heat the lithium-ion battery pack 602.

[0048] The control module 5 uses the resistance value of the electric ignition head of the lithium-ion battery or the insulation resistance value between the electrodes of the lithium-ion battery (with significant differences before and after operation) as the basis for replacing the lithium-ion battery. The specific values ​​mentioned above can be displayed on the panel of the status monitoring display 8.

[0049] In this embodiment, the unattended power supply system operates by monitoring the electrical performance parameters (capacity) of the lithium-ion battery module 6 via the monitoring program of the control module 5. When the lithium-ion battery module 6's performance decreases to a certain value due to environmental factors or reduced operating performance (e.g., capacity drops to approximately 50%), the activation program within the control module 5 runs, activating the lithium-ion battery using the electrical energy of the lithium-ion battery module 6. The lithium-ion battery then charges the lithium-ion battery module 6 and provides some heating and heat preservation functions. The lithium-ion battery module 6 can continue to output electrical energy, thus achieving long-term operation at low temperatures through this cyclical power consumption. During operation, the resistance value of the lithium-ion battery's ignition head or the insulation resistance value between its electrodes is simultaneously monitored, serving as the basis for replacing the lithium-ion battery. Before activation, the resistance of the lithium-ion battery's ignition head is in the ohmic range of 0–20 Ω, and after activation, it is 1 KΩ–20 MΩ; before activation, the insulation resistance value between the lithium-ion battery electrodes is greater than 20 MΩ, and after activation, it is 1 KΩ–10 MΩ. Once the surface temperature of the used lithium thermal battery has cooled to room temperature, it can be replaced using the mating electrical connector plug / socket.

[0050] Through comparative testing, the power supply system proposed in this invention has a 40% longer working time than a single lithium-ion battery at a normal temperature of 25°C, and can operate at temperatures as low as -30°C or even -40°C (with a discharge capacity of over 70% of the rated capacity).

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An unattended power supply system that can be autonomously charged, characterized by, The unattended power supply system comprises a structure module, a lithium thermal battery module, a lithium ion battery module and a control module, wherein The structure module comprises a lower cover plate, a skin and an upper cover plate, wherein four skins form a rectangular cavity, and the upper cover plate, the lower cover plate and the skins are fixedly connected to form a structure cavity, and the lithium thermal battery module, the lithium ion battery module and the control module are fixedly and integrally arranged inside the cavity; The lithium thermal battery module is composed of multiple lithium thermal batteries; each lithium thermal battery comprises a combined battery cover, a combined battery shell and a combined battery stack, wherein the combined battery stack is installed in the combined battery shell, and the combined battery cover is installed on the top of the combined battery shell; the combined battery cover comprises a gasket, two S terminal posts of an activation circuit, a positive output terminal post, a negative output terminal post and a battery cover; the battery cover and the terminal posts are a structural body, the terminal posts are uniformly distributed on the battery cover, and the gasket is fixedly arranged on the upper part of the battery cover and the terminal posts; the combined battery stack comprises a baffle, an ignition assembly, a single battery module, a heat preservation element, a polar lead-out wire and a fastening element, wherein the baffle is located at the outermost side of the upper and lower ends of the combined battery stack and serves to protect the battery stack; the ignition assembly is located on both sides of the combined battery stack, the upper and lower parts of the ignition assembly are flush with the end faces of the combined battery stack respectively, and the ignition assembly serves to transfer fire; the single battery module comprises multiple single batteries and is located in the middle part of the combined battery stack; the heat preservation element is located in the upper and lower parts of the combined battery stack and is fixedly arranged between the baffle and the single battery module symmetrically; the polar lead-out wire is connected with the corresponding lead wires of the positive output terminal and the negative output terminal post respectively to form a discharge path; the fastening element is used to fix the parts of the combined battery stack into a whole by winding the parts up and down; The lithium ion battery module comprises a lithium ion battery pack shell, a lithium ion battery pack, a lithium ion battery charging cable and a lithium ion battery discharging cable, wherein two through holes are formed at the bottom of the lithium ion battery pack shell, and the structure module is connected to the lithium ion battery pack shell; the lithium ion battery pack is composed of multiple single batteries through series and parallel connection; the lithium ion battery charging cable and the lithium ion battery discharging cable are respectively located at the two ends of the top of the lithium ion battery pack, and serve as the input interface and the output interface of the lithium ion battery pack to realize the charging and discharging of the lithium ion battery pack, and the two are independent and not collinear. The control module is installed on the upper part of the lithium ion battery pack, the input cable of the control module is connected with the lithium ion battery discharge cable of the lithium ion battery module, the output cable of the control module is connected with the activation loop formed by two S terminals and other electric loads in the lithium thermal battery module; the positive output terminal and the negative output terminal of the lithium thermal battery module are connected with the lithium ion battery charging cable through the control module; the control module monitors the electrical performance of the lithium ion battery through an internal monitoring program and feeds back to the single-chip microcomputer in real time; when the monitoring program detects that the power of the lithium ion battery pack is lower than a certain power value, the single-chip microcomputer sends a charging instruction, and the activation program in the control module activates the lithium thermal battery module after receiving the charging instruction; the output power of one lithium thermal battery in the lithium thermal battery module is charged to the lithium ion battery pack through the DC / DC direct current stabilizing converter and the charger in the control module at a certain current value; when the power of one lithium thermal battery is insufficient or its voltage is lower than a certain value, the next lithium thermal battery is activated, and the lithium ion battery pack is charged in turn; when the power of the lithium ion battery pack detected by the monitoring program reaches or approaches the full power, the single-chip microcomputer sends a small current trickle charging or stop charging instruction, cuts off the charging, and the lithium thermal battery outputs power at no load, and the lithium ion battery pack is continuously heated through the surface temperature of the lithium thermal battery.

2. The unattended power supply system of claim 1, wherein, The lower cover plate, the skin and the upper cover plate are made of titanium, aluminum and their alloy materials, or stainless steel materials.

3. The unattended power supply system of claim 1, wherein, The power switch and the state monitoring display are fixedly installed on the outer side of the skin, the power switch serves as the start / stop key of the whole power supply system, and the state monitoring display is used for displaying the capacity or voltage of the internal lithium ion battery, and the ignition head resistance and the insulation resistance between the electrodes of the lithium thermal battery.

4. The unattended power supply system of claim 1, wherein, The skin is also provided with an electrical connector plug or socket as an output port, the power supply system outputs externally through the output port, and the internal parts of the power supply system are isolated from the outside in terms of gas, heat and structure.

5. The unattended power supply system of claim 1, wherein, The battery cover and the terminals are integrated by glass powder high-temperature melting-solidification sintering.

6. The unattended power supply system of claim 1, wherein, The gasket is filled with silicone rubber between the terminals.

7. The unattended power supply system of claim 1, wherein, The combined battery shell is integrally processed by the battery shell and two ears; the two ears are oppositely arranged at the two ends of the battery shell, the lower end faces of the two ears are flush with the bottom of the battery shell, and circular through holes for mounting and connecting with other parts are processed in the ears.

8. The unattended power supply system of claim 1, wherein, The combined battery stack includes two groups of single battery modules and is connected in parallel through the pole lead-out wires.

9. The unattended power supply system of claim 1, wherein, The fastening element is selected from high-temperature resistant adhesive tape.

10. The unattended power supply system of claim 1, wherein, The single battery is a four-in-one structure of a heating agent layer, a positive electrode layer, an electrolyte layer and a negative electrode layer from bottom to top.

Images