A lithium battery low-temperature environment charging and discharging heat preservation device and method

Abstract

The application discloses a lithium battery low-temperature environment charging and discharging heat preservation device and method, relates to the technical field of lithium batteries, and comprises a battery mechanism, wherein the battery mechanism comprises a battery box, a cover plate is arranged above the battery box, a plurality of storage batteries are arranged in the battery box, and a heat preservation mechanism is arranged in the battery box; the heat preservation mechanism comprises a heat storage and heat preservation unit, and the heat storage and heat preservation unit is arranged in the battery box. The lithium battery low-temperature environment charging and discharging heat preservation device and method can not only guarantee the charging temperature when the storage battery is charged and discharged in a low-temperature environment, but also can release heat for a long time by using the solid-liquid conversion of heat storage salt, so that the temperature of the storage battery during the discharging process in a subsequent long period of time can be guaranteed without consuming too much power of the storage battery, thereby improving the charging and discharging efficiency of the storage battery in the low-temperature environment and guaranteeing the use effect of the storage battery in the low-temperature environment.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, specifically to a lithium battery low-temperature environment charging and discharging heat preservation device and method. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as the positive and negative electrode materials and a non-aqueous electrolyte solution. Due to their good discharge stability and smaller overall size compared to lead-acid batteries, lithium-ion batteries have a wide range of applications. However, when used in low-temperature environments, the viscosity of the electrolyte inside the lithium-ion battery increases, and the migration rate of ions slows down. This leads to an increase in the battery's internal resistance. For example, in an environment of around -20 degrees Celsius, the battery's internal resistance may increase several times compared to room temperature. Increased internal resistance leads to increased ohmic losses during charging and discharging, resulting in a significant decrease in charging and discharging efficiency, a significantly longer charging time, and a substantial reduction in the amount of electricity that can be output during discharge. This severely affects the device's battery life and can cause interruptions or other abnormalities during charging and discharging. Therefore, to ensure the charging and discharging stability of lithium-ion batteries in low-temperature environments, insulation measures are necessary.

[0003] Existing low-temperature charging and discharging insulation devices for lithium batteries mainly use electric heating to heat and maintain the lithium battery at a suitable charging and discharging temperature. However, lithium batteries have a long discharge time. If electric heating is used for a long time to heat and maintain the lithium battery, although it can maintain the operating temperature during discharge, it also greatly increases the power consumption of the lithium battery. As a result, the battery's range still suffers from a serious decline in low-temperature environments. Consequently, the performance of low-temperature charging and discharging insulation devices for lithium batteries is not ideal, and they cannot better guarantee the charging and discharging efficiency of lithium batteries in low-temperature environments.

[0004] Combining the above problems, we find that existing lithium battery charging and discharging heat preservation devices are difficult to avoid the aforementioned problems simultaneously during use. Even if they can solve these problems, they require the assistance of external tools, thus failing to achieve the desired effect. Therefore, we propose a lithium battery low-temperature environment charging and discharging heat preservation device and method. Summary of the Invention

[0005] The purpose of this invention is to provide a lithium battery low-temperature environment charging and discharging heat preservation device and method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a lithium battery low-temperature environment charging and discharging heat preservation device, comprising a battery mechanism, the battery mechanism comprising a battery box, a cover plate provided on the top of the battery box, a plurality of storage batteries provided inside the battery box, and a heat preservation mechanism provided inside the battery box;

[0007] The heat preservation mechanism includes a heat storage and heat preservation unit, which is located inside the battery box. The heat storage and heat preservation unit can ensure the charging and discharging temperature of the battery in a low-temperature environment by storing heat.

[0008] The insulation mechanism also includes a leakage protection unit, which is located inside the battery box and is used to increase the safety of the heat storage and insulation unit.

[0009] A high-temperature protection mechanism is provided on the left side of the heat storage and insulation unit. The high-temperature protection mechanism works in conjunction with the insulation mechanism to balance the high temperature of the battery.

[0010] In a preferred embodiment of the lithium battery low-temperature charging and discharging insulation device of the present invention, the heat storage and insulation unit includes an insulation box, the bottom surface of which is fixedly connected to the inner bottom wall of the battery box, a heat insulation frame fixedly connected to the upper surface of the insulation box, the bottom surfaces of several batteries being fixedly connected to the upper surface of the heat insulation frame, a storage box fixedly connected to the inner wall of the insulation box, an oil storage tank fixedly connected to the inner side wall of the storage box, a heating wire fixedly connected to the inner bottom wall of the storage box, and a conductive wire provided on the inner wall of the storage box. A heat-conducting coil has its input end extending into the interior of the oil storage tank. A delivery pump is located on the left side of the insulation box, and the right side of the delivery pump is fixedly connected to the left side of the battery box. The output end of the heat-conducting coil sequentially passes through the storage tank, the insulation box, and the battery box, and is fixedly connected to the input end of the delivery pump. An insulation shell is fixedly connected to the inner wall of the battery box. The bottom surface of the insulation shell is fixedly connected to the upper surface of the heat insulation frame. The inner wall of the insulation shell is fixedly connected to the outer surface of the limiting plate. An insulation plate is located above the insulation shell. The upper surface of the heat-conducting plate is fixedly connected to the bottom surface of the cover plate. The output end of the delivery pump is fixedly connected to a connecting pipe. The outer surfaces of several batteries are fitted with heat-insulating coils. The input ends of several heat-insulating coils are fixedly connected to a delivery pipe. The other end of the delivery pipe passes through the heat-insulating shell and the battery box in sequence and is fixedly connected to the connecting pipe. The output ends of several heat-insulating coils are fixedly connected to a return pipe. One end of the return pipe passes through the heat insulation frame, the heat-insulating box, and the storage box in sequence and extends into the interior of the oil tank. The outer surfaces of several batteries are jointly snapped with a limiting plate. The bottom surface of the limiting plate is fixedly connected to four temperature sensors. Each temperature sensor is electrically connected to the delivery pump through a wire. The outer surface of the output end of the heat-conducting coil is fixedly connected to a first solenoid valve. The right side of the first solenoid valve is fixedly connected to the left side of the battery box. The outer surface of the return pipe is fixedly connected to a second solenoid valve. The bottom surface of the second solenoid valve is fixedly connected to the upper surface of the heat insulation frame. Both the first and second solenoid valves are electrically connected to the temperature sensors through wires.

[0011] As a preferred embodiment of the lithium battery low-temperature environment charging and discharging insulation device of the present invention, wherein: a power receiving base is fixedly installed on the front of the battery box, the back of the power receiving base passes through the battery box and the insulation shell in sequence and extends to the bottom of the insulation board, the heating wire is electrically connected to the power receiving base through a wire, and two mounting supports are fixedly connected to both the front and back of the battery box.

[0012] As a preferred embodiment of the lithium battery low-temperature environment charging and discharging heat preservation device of the present invention, the cover plate is internally threaded with a number of mounting bolts, the bottom end of each mounting bolt penetrates into the interior of the battery box, and each mounting bolt is threadedly connected to the battery box.

[0013] As a preferred embodiment of the lithium battery low-temperature environment charging and discharging heat preservation device of the present invention, wherein: the outer surface of the heating wire and the outer surface of the heat-conducting coil are jointly fixedly connected to a plurality of stabilizing frames, and the upper surface and bottom surface of each stabilizing frame are fixedly connected to the inner top wall and inner bottom wall of the storage box.

[0014] As a preferred embodiment of the lithium battery low-temperature environment charging and discharging insulation device of the present invention, the leakage protection unit includes a temporary storage box, the right side of which is fixedly connected to the left side of the battery box, a third solenoid valve is fixedly connected to the upper surface of the temporary storage box, the other end of which is fixedly connected to the outer surface of a connecting pipe, a fourth solenoid valve is fixedly connected to the outer surface of the connecting pipe, the fourth solenoid valve is positioned above the third solenoid valve, a fifth solenoid valve is fixedly connected to the outer surface of the return pipe, a suction pipe is fixedly connected to the other end of the fifth solenoid valve, and the other end of the suction pipe passes through the insulation shell and the battery box in sequence and is fixedly connected to the input end of the delivery pump. A sixth solenoid valve is fixedly connected to the outer surface of the flow pipe, and an electronic pressure gauge is fixedly connected to the outer surface of the delivery pipe. Several guide grooves are opened on the upper surface of the heat insulation frame. A seventh solenoid valve is fixedly connected to the outer surface of the input end of the delivery pump. The right side of the seventh solenoid valve is fixedly connected to the left side of the battery box. The third, fourth, fifth, sixth, and seventh solenoid valves are all electrically connected to the electronic pressure gauge through wires. The other end of the seventh solenoid valve is fixedly connected to a drain pipe. The other end of the drain pipe passes through the battery box and the heat insulation frame in sequence and is fixedly connected to the guide grooves. The other end of the return pipe passes through the heat insulation frame and is fixedly connected to the outer surface of the drain pipe.

[0015] As a preferred embodiment of the lithium battery low-temperature environment charging and discharging heat preservation device of the present invention, wherein: a pressure relief valve is fixedly connected to the upper surface of the temporary storage box, and a drain valve is fixedly connected to the left side of the temporary storage box.

[0016] As a preferred embodiment of the lithium battery low-temperature environment charging and discharging insulation device of the present invention, the high-temperature protection mechanism includes a protective cover, the right side of which is fixedly connected to the left side of the battery box; the delivery pump, the first solenoid valve, the third solenoid valve, the fourth solenoid valve, and the seventh solenoid valve are all disposed inside the protective cover; the outer surface of the temporary storage box is fixedly connected to the inner wall of the protective cover; the drain valve extends through to the left side of the protective cover; a plurality of venting slots are provided on the left side of the protective cover; a heat dissipation coil is disposed inside the protective cover; and heat-conducting copper sheets arranged at equal intervals are fixedly connected to the outer surface of the heat dissipation coil. The left side of the hot copper sheet is fixedly connected to the right side of the protective cover. The input end of the heat dissipation coil is fixedly connected to an eighth solenoid valve. The other end of the eighth solenoid valve is fixedly connected to the outer surface of the connecting pipe. The eighth solenoid valve is located between the third and fourth solenoid valves. The eighth solenoid valve is electrically connected to a temperature sensor via a wire. The output end of the heat dissipation coil is fixedly connected to a one-way valve. The output end of the one-way valve is fixedly connected to the outer surface of the delivery pipe. The inner wall of the protective cover is fixedly connected to a limit frame. The inner wall of the limit frame is fixedly connected to several fixed cylinders. The inner walls of the several fixed cylinders are all fixedly connected to cooling fans.

[0017] As a preferred embodiment of the lithium battery low-temperature environment charging and discharging heat preservation device of the present invention, wherein: the inner walls of several fixed cylinders are fixedly connected with baffles, each baffle is disposed on the left side of the heat dissipation fan, and each baffle has equidistant ventilation holes on its left side.

[0018] A method for using a lithium battery low-temperature environment charging and discharging insulation device includes the following steps;

[0019] S1: First, connect the heating wire, delivery pump, temperature sensor, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, fifth solenoid valve, sixth solenoid valve, electronic pressure gauge, seventh solenoid valve, eighth solenoid valve, and cooling fan to an external controller. When charging the battery in a low-temperature environment through the junction box, the temperature sensor can detect the temperature inside the battery box. When the temperature inside the battery box is low, the heating wire and delivery pump can also be connected to an external power source through the junction box. The heating wire generates heat, and then the delivery pump draws the heat transfer oil from the oil tank to the outside through the heat transfer coil. When the heat transfer oil passes through the heat transfer coil, the heat provided by the heating wire will heat the heat transfer oil. Then, when the heat transfer oil passes through the delivery pump and connecting pipe, and enters the insulation coil through the delivery pipe, the temperature around the battery can be quickly increased by heat conduction, so that it reaches a more appropriate charging temperature.

[0020] S2: Once the battery reaches the appropriate temperature, the delivery pump stops working, and the first and second solenoid valves close. This, combined with the heat insulation frame, prevents heat from being conducted to the battery through the insulation box. Meanwhile, the heating wire continues to heat the pre-filled heat storage salt inside the storage tank until it melts or partially melts. This utilizes the solid-liquid conversion of the heat storage salt to store a large amount of heat. Simultaneously, the insulation box, storage tank, first solenoid valve, and second solenoid valve create a relatively enclosed heat storage space, reducing the rate of heat loss. Therefore, when the battery is fully charged, the storage tank also stores heat. The large amount of heat allows the battery to maintain its charging temperature even during prolonged discharge. If the low temperature environment causes the battery temperature to drop too low again, affecting the discharge effect, the battery only needs to provide a relatively small amount of electrical energy to drive the transfer pump. This allows the heat released by the heat storage salt inside the storage tank as it solidifies from liquid to solid to be transported to the outside of the battery through connecting pipes, transfer pipes, and insulation coils for insulation. Finally, the heat transfer oil flows back to the oil tank through the return pipe for recycling. This ensures that the battery can not only maintain the charging temperature when charging in a low-temperature environment, but also store a large amount of heat.

[0021] S3: By utilizing the solid-liquid conversion of the thermal storage salt to release heat outwards for an extended period, the battery can maintain its discharge temperature without excessively consuming its own electrical energy during the subsequent discharge process. This improves the battery's charging and discharging efficiency in low-temperature environments, ensuring its performance in such conditions. Even after the thermal storage salt has completely cooled down, the battery only needs to use electrical energy and a heating wire to reheat the salt and store a large amount of heat again to maintain its discharge temperature in low-temperature environments. This eliminates the need for continuous power supply for high-energy-consuming electric heating and insulation, effectively ensuring the battery's overall range in low-temperature environments. Furthermore, the battery box, insulation shell, and insulation board further enhance the battery's insulation performance, slowing down heat loss in low-temperature environments and making the battery less susceptible to the effects of low temperatures during charging and discharging.

[0022] S4: The pressure inside the insulation coil and the delivery pipe can be monitored by an electronic pressure gauge. When the temperature of the heat transfer oil inside the insulation coil and the delivery pipe increases, its pressure will gradually increase, and when the temperature decreases, the pressure will gradually decrease. Thus, the pressure value changes relatively slowly. When the pressure value drops sharply, it proves that the insulation coil, connecting pipe or delivery pipe has been damaged by external collisions and impacts, resulting in leakage of the heat transfer oil inside. At this time, the electronic pressure gauge can control the first and second solenoid valves to close actively, the third, fifth and seventh solenoid valves to open, and the fourth and sixth solenoid valves to close at the same time. The delivery pump starts to work and quickly draws the heat transfer oil inside the insulation coil and the delivery pipe out through the suction pipe, the fifth solenoid valve and the return pipe. The heat transfer oil is then sent into the temporary storage tank for collection by the closed fourth solenoid valve and the open third solenoid valve, instead of continuing to send it back into the storage tank for circulation.

[0023] S5: Furthermore, the heat transfer oil leaking from the insulation coil and the delivery pipe will also flow into the guide groove on the heat insulation rack. Then, through the guide pipe connected to the guide groove, it can also be sucked in by the delivery pump and sent to the temporary storage box. This can prevent the heat transfer oil used for heating and insulation from leaking and corroding the battery. Even if the heat transfer oil leaks due to collision or bump during the heating and insulation process, the heat transfer oil will not be directly soaked on the outside of the battery. This prevents the heat transfer oil from entering the battery too much and causing short circuit damage, thus increasing the heating and insulation safety and reliability of the battery.

[0024] S6: When the temperature sensor detects that the internal temperature of the battery box is too high, affecting the safety of battery charging and discharging, the temperature sensor can control the first, second, seventh, sixth, third, and fourth solenoid valves to close, while the fifth and eighth solenoid valves open. Simultaneously, the cooling fan starts working. Consequently, the heat transfer oil inside the insulation coil, delivery pipe, and return pipe no longer flows into the storage tank for heating and circulation. Instead, it is pumped into the cooling coil through the eighth solenoid valve by the delivery pump. At this time, the airflow provided by the cooling fan, combined with the fixed cylinder and limit bracket, draws outside air into the protective cover. The air then blows over the cooling coil and heat-conducting copper fins before being discharged outwards through the exhaust slot. This allows the heat transfer oil to be cooled as it flows through the cooling coil. Finally, when the heat transfer oil inside the cooling coil passes through… When the one-way valve recirculates into the insulation coil through the delivery pipe, it effectively reduces the temperature around the battery. This allows for low-temperature charging and discharging insulation of the battery while further balancing its operating temperature. If the battery's operating temperature is too high and affects its safety, timely cooling measures can be implemented to ensure the battery remains within a suitable operating temperature range, thus guaranteeing effective charging and discharging insulation. Furthermore, the cooling and heat transfer oil circulation loops are different from the heating and insulation oil circulation loops, preventing any impact on the heat storage of the heat-storing salt inside the storage tank. After the battery cooling and insulation process is complete, the eighth solenoid valve closes, and the first and second solenoid valves reset, preparing for subsequent battery insulation work.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. This invention, by setting up a heat storage and insulation unit, can use an external power source to heat and insulate the battery during charging, keeping the battery at a suitable charging temperature in low-temperature environments. This prevents the charging temperature from being too low and affecting the battery's energy storage performance. Furthermore, it can store a large amount of heat by heating and melting the heat storage salt. This allows the battery to not only maintain the charging temperature but also store a large amount of heat during charging in low-temperature environments. The solid-liquid conversion of the heat storage salt releases heat to the outside for a long time, ensuring that the battery maintains its temperature during discharge without excessively consuming its own electrical energy during the subsequent long discharge process. This improves the charging and discharging efficiency of the battery in low-temperature environments and ensures the battery's performance in low-temperature conditions.

[0027] 2. By setting up a leakage protection unit, this invention can prevent the heat transfer oil used for heating and insulation from leaking and corroding the battery. Even if the heat transfer oil leaks due to collision or bump during the heating and insulation process, the heat transfer oil will not be directly immersed in the outside of the battery. This prevents excessive heat transfer oil from entering the battery and causing short circuit damage, thus increasing the safety and reliability of the battery's heating and insulation.

[0028] 3. By setting up a high-temperature protection mechanism, this invention can work with the heat storage and insulation unit to keep the battery warm during low-temperature charging and discharging, while further balancing the battery's operating temperature. When the battery's operating temperature is too high and affects the safety of battery use, it can cool the battery in a timely manner, so that the battery can always be kept in a very suitable operating temperature range, further ensuring the charging and discharging insulation effect of the lithium battery. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a cross-sectional structural schematic diagram of the cover plate, insulation shell, and insulation plate of the present invention;

[0032] Figure 3 This is a cross-sectional structural schematic diagram of the battery box of the present invention;

[0033] Figure 4 This is a cross-sectional view of the limiting plate and heat insulation frame of the present invention after unfolding.

[0034] Figure 5 This is a schematic diagram of the structure of the insulation coil, delivery pipe and return pipe of the present invention;

[0035] Figure 6 This is a cross-sectional structural schematic diagram of the insulated box and storage box of the present invention;

[0036] Figure 7 This is a cross-sectional structural schematic diagram of the heat insulation frame of the present invention;

[0037] Figure 8 This is a cross-sectional structural schematic diagram of the protective cover of the present invention;

[0038] Figure 9 This is a schematic diagram of the structure of the fixed cylinder, cooling fan and baffle of the present invention after they have been unfolded.

[0039] Figure 10 This is a schematic diagram of the heat dissipation coil structure of the present invention.

[0040] In the diagram: 1. Battery mechanism; 11. Battery box; 12. Cover plate; 13. Storage battery; 2. Insulation mechanism; 21. Heat storage and insulation unit; 2101. Insulation box; 2102. Heat insulation frame; 2103. Oil tank; 2104. Heating wire; 2105. Heat conduction coil; 2106. Delivery pump; 2107. Connecting pipe; 2108. Insulation coil; 2109. Return pipe; 2110. Limiting plate; 2111. Temperature sensor; 2112. Insulation shell; 2113. Insulation board; 2114. First solenoid valve; 2115. Second solenoid valve; 2116. Electrical connector; 2117. Mounting support; 2118. Mounting bolt; 2119. Stabilizing frame; 2120. Delivery pipe; 2 121. Storage tank; 22. Leakage protection unit; 2201. Temporary storage tank; 2202. Third solenoid valve; 2203. Fourth solenoid valve; 2204. Fifth solenoid valve; 2205. Suction pipe; 2206. Sixth solenoid valve; 2207. Electronic pressure gauge; 2208. Flow guide channel; 2209. Drain pipe; 2210. Seventh solenoid valve; 2211. Pressure relief valve; 2212. Drain valve; 3. High temperature protection mechanism; 301. Protective cover; 302. Cooling coil; 303. Thermally conductive copper sheet; 304. Eighth solenoid valve; 305. Check valve; 306. Limiting bracket; 307. Fixing cylinder; 308. Cooling fan; 309. Exhaust channel; 310. Baffle; 311. Vent hole. Detailed Implementation

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0044] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0045] Example 1: Please refer to Figures 1-6 The present invention provides a technical solution: a lithium battery low-temperature environment charging and discharging heat preservation device, including a battery mechanism 1, the battery mechanism 1 including a battery box 11, a cover plate 12 is provided on the top of the battery box 11, a plurality of storage batteries 13 are provided inside the battery box 11, and a heat preservation mechanism 2 is provided inside the battery box 11.

[0046] The heat preservation mechanism 2 includes a heat storage and heat preservation unit 21, which is located inside the battery box 11. The heat storage and heat preservation unit 21 can ensure the charging and discharging temperature of the battery 13 in a low-temperature environment by storing heat.

[0047] As a further definition of the heat preservation mechanism 2 of the present invention, the heat storage and heat preservation unit 21 includes a heat preservation box 2101. The bottom surface of the heat preservation box 2101 is fixedly connected to the inner bottom wall of the battery box 11. A heat insulation frame 2102 is fixedly connected to the upper surface of the heat preservation box 2101. The bottom surfaces of several batteries 13 are fixedly connected to the upper surface of the heat insulation frame 2102. A storage box 2121 is fixedly connected to the inner wall of the heat preservation box 2101. An oil storage tank 2103 is fixedly connected to the inner side wall of the storage box 2121. A heating wire 2104 is fixedly connected to the inner bottom wall of the storage box 2121. A heat conduction coil 2105 is provided on the inner wall of the storage box 2121. The input end of the heat conduction coil 2105 extends into the interior of the oil storage tank 2103. A delivery pump 2 is provided on the left side of the heat preservation box 2101. 106. The right side of the delivery pump 2106 is fixedly connected to the left side of the battery box 11. The output end of the heat-conducting coil 2105 passes through the storage box 2121, the insulation box 2101, and the battery box 11 in sequence and is fixedly connected to the input end of the delivery pump 2106. An insulation shell 2112 is fixedly connected to the inner wall of the battery box 11. The bottom surface of the insulation shell 2112 is fixedly connected to the upper surface of the heat insulation frame 2102. The inner wall of the insulation shell 2112 is fixedly connected to the outer surface of the limiting plate 2110. An insulation plate 2113 is provided above the insulation shell 2112. The upper surface of the insulation plate 2113 is fixedly connected to the bottom surface of the cover plate 12. The output end of the delivery pump 2106 is fixedly connected to the connecting pipe 2107. An insulation coil is fitted on the outer surface of several batteries 13. 2108, the input ends of several heat-insulating coils 2108 are all fixedly connected to a delivery pipe 2120. The other end of the delivery pipe 2120 passes through the heat-insulating shell 2112 and the battery box 11 in sequence and is fixedly connected to a connecting pipe 2107. The output ends of several heat-insulating coils 2108 are all fixedly connected to a return pipe 2109. One end of the return pipe 2109 passes through the heat insulation frame 2102, the heat-insulating box 2101 and the storage box 2121 in sequence and extends into the interior of the oil storage tank 2103. The outer surfaces of several batteries 13 are all snapped onto a limiting plate 2110. The bottom surface of the limiting plate 2110 is fixedly connected to four temperature sensors 2111. Each temperature sensor 2111 is electrically connected to the delivery pump 2106 through a wire. The heat-conducting coil 2105 delivers... A first solenoid valve 2114 is fixedly connected to the outer surface of the outlet end. The right side of the first solenoid valve 2114 is fixedly connected to the left side of the battery box 11. A second solenoid valve 2115 is fixedly connected to the outer surface of the return pipe 2109. The bottom surface of the second solenoid valve 2115 is fixedly connected to the upper surface of the heat insulation frame 2102. Both the first solenoid valve 2114 and the second solenoid valve 2115 are electrically connected to the temperature sensor 2111 via wires. By setting up the heat storage and insulation unit 21, the battery 13 can be heated and kept warm by an external power source during charging, so that the battery 13 is at a suitable charging temperature in a low-temperature environment, preventing the charging temperature from being too low and affecting the battery's energy storage effect. Furthermore, a large amount of heat can be stored by heating and melting the heat storage salt.This design allows the battery 13 to not only maintain its charging temperature when charged in low-temperature environments, but also to store a large amount of heat. By utilizing the solid-liquid conversion of the heat storage salt, it releases heat outwards over a prolonged period. This ensures that during subsequent discharge, the battery 13 maintains its discharge temperature without excessively consuming its own electrical energy, thereby improving its charging and discharging efficiency in low-temperature environments and guaranteeing its performance in such conditions.

[0048] A power connector 2116 is fixedly installed on the front of the battery box 11. The back of the power connector 2116 passes through the battery box 11 and the insulation shell 2112 and extends to the bottom of the insulation plate 2113. The heating wire 2104 is electrically connected to the power connector 2116 through a wire. Two mounting brackets 2117 are fixedly connected to both the front and back of the battery box 11. The power connector 2116 can ensure that the battery 13 can be smoothly connected to the external power source and ensure the normal charging and discharging of the battery 13. The mounting brackets 2117 can be used with bolts and other tools to fix the battery box 11, ensuring the installation of the battery box 11 is firm and convenient.

[0049] The cover plate 12 has several mounting bolts 2118 internally threaded. The bottom end of each mounting bolt 2118 penetrates into the battery box 11 and is threadedly connected to the battery box 11. The cover plate 12 can be fixed to the top of the battery box 11 by the mounting bolts 2118, which increases the tightness of the installation between the cover plate 12 and the battery box 11. When it is necessary to open the cover plate 12 to inspect the internal facilities of the battery box 11, the cover plate 12 can also be opened more easily by removing the mounting bolts 2118.

[0050] Several stabilizing brackets 2119 are fixedly connected to the outer surface of the heating wire 2104 and the outer surface of the heat-conducting coil 2105. The upper and lower surfaces of each stabilizing bracket 2119 are fixedly connected to the inner top and inner bottom walls of the storage box 2121. The stabilizing brackets 2119 can fix the heating wire 2104 and the heat-conducting coil 2105 in the position inside the storage box 2121, while increasing the overall structural strength of the storage box 2121 and improving the pressure-bearing capacity of the storage box 2121.

[0051] The specific implementation of this embodiment is as follows: First, the heating wire 2104, the delivery pump 2106, the temperature sensor 2111, the first solenoid valve 2114, and the second solenoid valve 2115 are connected to an external controller. When the battery 13 is charged in a low-temperature environment through the connector 2116, the temperature sensor 2111 can detect the temperature inside the battery box 11. When the temperature inside the battery box 11 is low, the heating wire 2104 and the delivery pump 2106 can also be connected to an external power source through the connector 2116 to generate heat using the heating wire 2104. Then, the delivery pump 2106 draws the heat transfer oil from the oil tank 2103 to the outside through the heat transfer coil 2105. When the heat transfer oil passes through the heat transfer coil 2105, the heating wire... The heat provided by 2104 heats the heat transfer oil. When the heat transfer oil enters the insulation coil 2108 via the delivery pump 2106, connecting pipe 2107, and delivery pipe 2120, it rapidly increases the temperature around the battery 13 through heat conduction, bringing it to a suitable charging temperature. Once the battery 13 reaches the appropriate temperature, the delivery pump 2106 stops working, and the first solenoid valve 2114 and the second solenoid valve 2115 close. Combined with the heat insulation frame 2102, this prevents heat from continuing to be conducted to the battery 13 through the insulation box 2101. Meanwhile, the heating wire 2104 continues to heat the heat storage salt pre-filled inside the storage tank 2121 until it melts or partially melts, thus utilizing the solid-liquid conversion of the heat storage salt to store a large amount of heat. Simultaneously, the insulation box 2101, in conjunction with the storage box 2121, the first solenoid valve 2114, and the second solenoid valve 2115, can form a relatively enclosed heat storage space, reducing the rate of heat loss. Therefore, after the battery 13 is fully charged, the storage box 2121 also stores a large amount of heat. This means that during a prolonged discharge process, if the low temperature environment causes the battery 13 to become too cold again, affecting the discharge effect, the battery 13 only needs to provide a relatively small amount of electrical energy to drive the transfer pump 2106. This allows the heat released by the heat-storing salt inside the storage box 2121 during the solidification process to be transported to the battery via the connecting pipe 2107, the transfer pipe 2120, and the insulation coil 2108. The battery 13 is externally insulated, and the heat transfer oil flows back to the oil storage tank 2103 through the return pipe 2109 for recycling. This allows the battery 13 to not only maintain the charging temperature when charging in a low-temperature environment, but also to store a large amount of heat. The solid-liquid conversion of the heat storage salt releases heat outwards for a long time, ensuring that the battery 13 maintains its discharge temperature without excessively consuming its own electrical energy during subsequent discharges. This improves the charging and discharging efficiency of the battery 13 in low-temperature environments, guaranteeing its performance in such conditions. Even after the heat storage salt has completely cooled down, the battery 13 only needs to reheat the heat storage salt using electrical energy and the heating wire 2104.This allows the battery to store a large amount of heat again for discharge insulation in low-temperature environments, eliminating the need for continuous power supply for energy-intensive electric heating insulation. This effectively ensures the overall range of the battery 13 in low-temperature environments. Furthermore, the battery box 11, in conjunction with the insulation shell 2112 and insulation plate 2113, further enhances the insulation performance of the battery 13, making heat loss from the battery 13 slower in low-temperature environments and reducing its susceptibility to low-temperature effects during charging and discharging.

[0052] Example 2: Please refer to Figure 4 , Figure 5 , Figure 7 The present invention provides a technical solution: a lithium battery low-temperature environment charging and discharging heat preservation device. The present invention makes corresponding improvements to the technical problems mentioned in the background art. The heat preservation mechanism 2 also includes a leakage protection unit 22, which is disposed inside the battery box 11. The leakage protection unit 22 is used to increase the heat storage and heat preservation safety of the heat storage and heat preservation unit 21.

[0053] As a further definition of the insulation mechanism 2 of the present invention, the leakage protection unit 22 includes a temporary storage box 2201. The right side of the temporary storage box 2201 is fixedly connected to the left side of the battery box 11. A third solenoid valve 2202 is fixedly connected to the upper surface of the temporary storage box 2201. The other end of the third solenoid valve 2202 is fixedly connected to the outer surface of the connecting pipe 2107. A fourth solenoid valve 2203 is fixedly connected to the outer surface of the connecting pipe 2107. The fourth solenoid valve 2203 is disposed above the third solenoid valve 2202. The outer surface of the return pipe 2109 is fixedly connected to the third solenoid valve 2202. The fifth solenoid valve 2204 is connected to the other end of which is fixedly connected to the suction pipe 2205. The other end of the suction pipe 2205 passes through the insulation shell 2112 and the battery box 11 in sequence and is fixedly connected to the input end of the delivery pump 2106. The outer surface of the return pipe 2109 is fixedly connected to the sixth solenoid valve 2206. The outer surface of the delivery pipe 2120 is fixedly connected to the electronic pressure gauge 2207. The upper surface of the heat insulation frame 2102 is provided with several guide grooves 2208. The outer surface of the input end of the delivery pump 2106 is fixedly connected to the sixth solenoid valve 2206. The seventh solenoid valve 2210 is fixedly connected to the left side of the battery box 11 on its right side. The third solenoid valve 2202, fourth solenoid valve 2203, fifth solenoid valve 2204, sixth solenoid valve 2206, and seventh solenoid valve 2210 are all electrically connected to the electronic pressure gauge 2207 via wires. The other end of the seventh solenoid valve 2210 is fixedly connected to a drain pipe 2209. The other end of the drain pipe 2209 passes through the battery box 11 and the heat insulation frame 2102 in sequence and is fixedly connected to the guide groove 2208. The return pipe 2109... The other end passes through the heat insulation frame 2102 and is fixedly connected to the outer surface of the drain pipe 2209. By setting the leakage protection unit 22, it can prevent the heat transfer oil used for heating and heat preservation from leaking and corroding the battery 13. Even if the heat transfer oil leaks due to collision or bump during the heating and heat preservation process, the heat transfer oil will not be directly immersed in the outside of the battery 13, thereby preventing the heat transfer oil from entering the battery 13 too much and causing short circuit damage to the battery 13. This increases the heating and heat preservation safety and reliability of the battery 13.

[0054] A pressure relief valve 2211 is fixedly connected to the upper surface of the temporary storage box 2201, and a drain valve 2212 is fixedly connected to the left side of the temporary storage box 2201. The pressure relief valve 2211 can discharge excess pressure inside the temporary storage box 2201 to the outside, preventing damage to the temporary storage box 2201 due to excessive internal pressure. The drain valve 2212 allows workers to easily discharge the hydraulic oil inside the temporary storage box 2201, ensuring convenient drainage of the oil inside the temporary storage box 2201.

[0055] The specific implementation of this embodiment is as follows: The third solenoid valve 2202, the fourth solenoid valve 2203, the fifth solenoid valve 2204, the sixth solenoid valve 2206, the electronic pressure gauge 2207, and the seventh solenoid valve 2210 are connected to an external controller. At this time, the electronic pressure gauge 2207 can monitor the pressure values ​​inside the insulation coil 2108 and the delivery pipe 2120. When the temperature of the heat transfer oil inside the insulation coil 2108 and the delivery pipe 2120 increases, its pressure gradually increases; conversely, when the temperature decreases, the pressure gradually decreases. Thus, the pressure value changes relatively... The pressure should rise or fall gradually. A sudden drop in pressure indicates damage to the insulation coil 2108, connecting pipe 2107, or delivery pipe 2120 due to external impact or collision, causing leakage of the internal heat transfer oil. In this situation, the electronic pressure gauge 2207 controls the first solenoid valve 2114 and the second solenoid valve 2115 to close, while the third solenoid valve 2202, the fifth solenoid valve 2204, and the seventh solenoid valve 2210 open. Simultaneously, the fourth solenoid valve 2203 and the sixth solenoid valve 2206 close, and the delivery pump 2106 begins operation. Through the suction pipe 2205, the fifth solenoid valve 2204, and the return pipe 2109, the heat transfer oil inside the insulation coil 2108 and the delivery pipe 2120 is rapidly drawn out. The heat transfer oil is then fed into the temporary storage tank 2201 for collection via the closed fourth solenoid valve 2203 and the open third solenoid valve 2202, instead of being returned to the storage tank 2121 for continued circulation. Furthermore, the heat transfer oil leaking from the insulation coil 2108 and the delivery pipe 2120 also flows into the guide groove 2208 on the insulation rack 2102, thereby... Through the drain pipe 2209 connected to the guide channel 2208, it can also be sucked in by the delivery pump 2106 and sent to the temporary storage tank 2201, thereby preventing the heat transfer oil used for heating and heat preservation from leaking and corroding the battery 13. Even if the heat transfer oil leaks due to collision or bump during the heating and heat preservation process, the heat transfer oil will not be directly immersed on the outside of the battery 13, thus preventing excessive heat transfer oil from entering the battery 13 and causing short circuit damage to the battery 13, thereby increasing the heating and heat preservation safety and reliability of the battery 13.

[0056] Example 3: Please refer to Figure 2 , Figure 3 Figure 5 , Figures 7-10 The present invention provides a technical solution: a lithium battery low-temperature environment charging and discharging heat preservation device. The present invention makes corresponding improvements to the technical problems mentioned in the background art. A high temperature protection mechanism 3 is provided on the left side of the heat storage and heat preservation unit 21. The high temperature protection mechanism 3 is used in conjunction with the heat preservation mechanism 2. The high temperature protection mechanism 3 is used to balance the high temperature of the battery 13.

[0057] As a further definition of the high-temperature protection mechanism 3 of the present invention, the high-temperature protection mechanism 3 includes a protective cover 301. The right side of the protective cover 301 is fixedly connected to the left side of the battery box 11. The delivery pump 2106, the first solenoid valve 2114, the third solenoid valve 2202, the fourth solenoid valve 2203, and the seventh solenoid valve 2210 are all disposed inside the protective cover 301. The outer surface of the temporary storage box 2201 is fixedly connected to the inner wall of the protective cover 301. The drain valve 2212 extends through the left side of the protective cover 301. On the left side of the protective cover 301, several exhaust slots 309 are provided. A heat dissipation coil 302 is installed inside the protective cover 301. Equally spaced heat-conducting copper fins 303 are fixedly connected to the outer surface of the heat dissipation coil 302. The left side of each heat-conducting copper fin 303 is fixedly connected to the right side of the protective cover 301. An eighth solenoid valve 304 is fixedly connected to the input end of the heat dissipation coil 302. The other end of the eighth solenoid valve 304 is fixedly connected to the outer surface of the connecting pipe 2107. 04 is located between the third solenoid valve 2202 and the fourth solenoid valve 2203. The eighth solenoid valve 304 is electrically connected to the temperature sensor 2111 via a wire. The output end of the heat dissipation coil 302 is fixedly connected to a one-way valve 305. The output end of the one-way valve 305 is fixedly connected to the outer surface of the delivery pipe 2120. The inner wall of the protective cover 301 is fixedly connected to a limit frame 306. The inner wall of the limit frame 306 is fixedly connected to several fixed cylinders 307. The inner walls of the several fixed cylinders 307 are all fixedly connected to a heat dissipation fan 308. By setting the high temperature protection mechanism 3, it can work with the heat storage and insulation unit 21 to keep the battery 13 warm during low temperature charging and discharging. At the same time, it can further balance the working temperature of the battery 13. When the working temperature of the battery 13 is high and affects the safety of the battery 13, it can cool down the battery 13 in time, so that the battery 13 can always be kept in a very suitable working temperature range, which further ensures the charging and discharging insulation effect of the battery 13.

[0058] Several fixed cylinders 307 are fixedly connected to the inner walls of each of them. Each baffle 310 is located on the left side of the cooling fan 308. Each baffle 310 has equidistant ventilation holes 311 on its left side. By using the baffle 310 in conjunction with the ventilation holes 311, it is possible to ensure that the outside can enter the fixed cylinder 307 smoothly while preventing large impurities from being sucked into the fixed cylinder 307, thus ensuring the safe operation of the cooling fan 308.

[0059] The specific implementation of this embodiment is as follows: When the temperature sensor 2111 detects that the internal temperature of the battery box 11 is too high and affects the charging and discharging safety of the battery 13, the temperature sensor 2111 can control the first solenoid valve 2114, the second solenoid valve 2115, the seventh solenoid valve 2210, the sixth solenoid valve 2206, the third solenoid valve 2202, and the fourth solenoid valve 2203 to close, while the fifth solenoid valve 2204 and the eighth solenoid valve 304 open. At the same time, the cooling fan 308 starts to work, thereby activating the insulation coil 2108. The heat transfer oil inside the delivery pipe 2120 and return pipe 2109 no longer flows into the storage tank 2121 for heating and circulation. Instead, it is sent by the delivery pump 2106 through the eighth solenoid valve 304 into the heat dissipation coil 302. At this time, the air force provided by the cooling fan 308, in conjunction with the fixed cylinder 307 and the limit bracket 306, can draw outside air into the protective cover 301 and blow the air over the heat dissipation coil 302 and the heat-conducting copper fins 303 before being discharged outward from the exhaust groove 309. This allows the heat transfer oil to flow through the heat dissipation coil 302 and return pipe 2109. At time 2, the temperature can be reduced. When the heat transfer oil inside the heat dissipation coil 302 finally flows back into the insulation coil 2108 through the delivery pipe 2120 via the one-way valve 305 for circulation, the temperature around the battery 13 can be effectively reduced. This allows the battery 13 to be charged and discharged in a low-temperature environment while maintaining its temperature. It can also further balance the operating temperature of the battery 13. If the operating temperature of the battery 13 is too high and affects the safety of the battery 13, it can be cooled down in time to ensure that the battery 13 can always be kept in a very suitable operating temperature range. This further ensures the charging and discharging heat preservation effect of the battery 13. Moreover, the cooling heat transfer oil circulation loop of the battery 13 is different from the heating heat transfer oil circulation loop, so it will not affect the heat storage of the heat storage salt inside the storage tank 2121. After the cooling and heat preservation work of the battery 13 is completed, the eighth solenoid valve 304 is closed, and the first solenoid valve 2114 and the second solenoid valve 2115 are reset, preparing for the subsequent heat preservation work of the battery 13.

[0060] A method for using a lithium battery low-temperature environment charging and discharging insulation device includes the following steps:

[0061] S1: First, connect the heating wire 2104, delivery pump 2106, temperature sensor 2111, first solenoid valve 2114, second solenoid valve 2115, third solenoid valve 2202, fourth solenoid valve 2203, fifth solenoid valve 2204, sixth solenoid valve 2206, electronic pressure gauge 2207, seventh solenoid valve 2210, eighth solenoid valve 304, and cooling fan 308 to an external controller. When charging the battery 13 in a low-temperature environment via the terminal block 2116, the temperature sensor 2111 can detect the internal temperature of the battery box 11. When the internal temperature of the battery box 11 is low, the electric... The heating wire 2104 and the delivery pump 2106 can also be connected to an external power source through the junction box 2116. The heating wire 2104 generates heat, and then the delivery pump 2106 draws the heat transfer oil inside the oil tank 2103 out through the heat transfer coil 2105. When the heat transfer oil passes through the heat transfer coil 2105, the heat provided by the heating wire 2104 will heat the heat transfer oil. Then, when the heat transfer oil enters the heat insulation coil 2108 through the delivery pump 2106, the connecting pipe 2107, and the delivery pipe 2120, the temperature around the battery 13 can be quickly increased by heat conduction, so that it reaches a more appropriate charging temperature.

[0062] S2: When the battery 13 reaches a suitable temperature, the delivery pump 2106 stops working, and the first solenoid valve 2114 and the second solenoid valve 2115 close. Together with the heat insulation frame 2102, heat is prevented from continuing to be directed to the battery 13 through the insulation box 2101. Meanwhile, the heating wire 2104 continues to heat the heat storage salt pre-filled inside the storage box 2121 until it melts or partially melts. This utilizes the solid-liquid conversion of the heat storage salt to store a large amount of heat. Simultaneously, the insulation box 2101, along with the storage box 2121, the first solenoid valve 2114, and the second solenoid valve 2115, forms a relatively enclosed heat storage space, reducing the rate of heat loss. Therefore, when the battery 13 is fully charged, the storage box 2101... The internal storage tank 21 also stores a large amount of heat, so that if the low temperature environment causes the battery 13 to become too cold and affect the discharge effect during the discharge process of the battery 13 for a long period of time, the battery 13 only needs to provide less electrical energy to drive the transfer pump 2106, so that the heat released by the heat storage salt inside the storage tank 2121 during the process of liquid solidification is transported to the outside of the battery 13 through the connecting pipe 2107, the transfer pipe 2120 and the heat insulation coil 2108 for heat preservation. Finally, the heat transfer oil flows back to the oil storage tank 2103 through the return pipe 2109 for recycling. This allows the battery 13 to not only maintain the charging temperature when charging in a low temperature environment, but also to store a large amount of heat.

[0063] S3: By utilizing the solid-liquid conversion of the thermal storage salt to release heat to the outside for a long time, the battery 13 can maintain its discharge temperature during a relatively long period of discharge without consuming too much of its own electrical energy. This improves the charging and discharging efficiency of the battery 13 in low-temperature environments and ensures the battery 13's performance in low-temperature environments. Even after the thermal storage salt has completely cooled down, the battery 13 only needs to use electrical energy in conjunction with the heating wire 2104 to reheat the thermal storage salt to store a large amount of heat again to achieve discharge heat preservation in low-temperature environments. There is no need to continuously provide electrical energy for high-energy-consuming electric heating heat preservation, thus effectively ensuring the overall endurance of the battery 13 in low-temperature environments. Furthermore, the battery box 11, together with the insulation shell 2112 and the insulation plate 2113, can further increase the heat preservation performance of the battery 13, making the heat loss rate of the battery 13 in low-temperature environments slower and making the battery 13 less susceptible to the effects of low temperatures when charging and discharging in low-temperature environments.

[0064] S4: The electronic pressure gauge 2207 can monitor the pressure inside the insulation coil 2108 and the conveying pipe 2120. When the temperature of the heat transfer oil inside the insulation coil 2108 and the conveying pipe 2120 increases, its pressure will gradually increase; when the temperature decreases, the pressure will gradually decrease. Thus, the pressure change is a relatively gradual rise or fall. When the pressure drops sharply, it proves that the insulation coil 2108, the connecting pipe 2107, or the conveying pipe 2120 has been damaged due to external collisions or impacts, resulting in leakage of the heat transfer oil inside. At this time, the electronic pressure gauge 2207 can control the first solenoid valve 2114 and the second solenoid valve. Valve 2115 is actively closed, the third solenoid valve 2202, the fifth solenoid valve 2204 and the seventh solenoid valve 2210 are opened, and the fourth solenoid valve 2203 and the sixth solenoid valve 2206 are closed. The transfer pump 2106 starts to work and quickly draws the heat transfer oil inside the insulation coil 2108 and the transfer pipe 2120 out through the suction pipe 2205, the fifth solenoid valve 2204 and the return pipe 2109. The heat transfer oil is then sent into the temporary storage tank 2201 for collection through the closed fourth solenoid valve 2203 and the open third solenoid valve 2202, instead of continuing to send it back into the storage tank 2121 for circulation.

[0065] S5: Furthermore, the heat transfer oil leaking from the insulation coil 2108 and the delivery pipe 2120 will also flow into the guide groove 2208 on the heat insulation frame 2102. Then, through the guide pipe 2209 connected to the guide groove 2208, it can also be sucked into the delivery pump 2106 and sent to the temporary storage box 2201. This can prevent the heat transfer oil used for heating and insulation from leaking and corroding the battery 13. Even if the heat transfer oil leaks due to collision or bump during the heating and insulation process, the heat transfer oil will not be directly soaked on the outside of the battery 13. This prevents the heat transfer oil from entering the battery 13 too much and causing short circuit damage to the battery 13, thus increasing the heating and insulation safety and reliability of the battery 13.

[0066] S6: When the temperature sensor 2111 detects that the internal temperature of the battery box 11 is too high and affects the charging and discharging safety of the battery 13, the temperature sensor 2111 can control the first solenoid valve 2114, the second solenoid valve 2115, the seventh solenoid valve 2210, the sixth solenoid valve 2206, the third solenoid valve 2202, and the fourth solenoid valve 2203 to close, while the fifth solenoid valve 2204 and the eighth solenoid valve 304 open. At the same time, the cooling fan 308 starts to work, thereby activating the insulation coil 2108 and the delivery pipe 212. The heat transfer oil inside the return pipe 2109 no longer flows into the storage tank 2121 for heating and circulation. Instead, it is sent by the delivery pump 2106 through the eighth solenoid valve 304 into the heat dissipation coil 302. At this time, the airflow provided by the cooling fan 308, in conjunction with the fixed cylinder 307 and the limiting bracket 306, draws outside air into the protective cover 301. The air then blows through the heat dissipation coil 302 and the heat-conducting copper fins 303 before being discharged outward from the exhaust groove 309. This ensures that the heat transfer oil is properly heated as it flows through the heat dissipation coil 302. Lowering the temperature allows the heat transfer oil inside the cooling coil 302 to circulate back into the insulation coil 2108 through the delivery pipe 2120 via the one-way valve 305, effectively reducing the temperature around the battery 13. This enables the battery 13 to be charged and discharged in a low-temperature environment while maintaining its temperature, further balancing its operating temperature. If the battery 13's operating temperature is too high and affects its safety, timely cooling measures can be implemented to ensure it remains within a suitable operating temperature range, further guaranteeing the battery 13's charging and discharging insulation effect. Furthermore, the cooling heat transfer oil circulation loop for the battery 13 is different from the heating and insulation heat transfer oil circulation loop, thus not affecting the heat storage of the heat storage salt inside the storage tank 2121. After the battery 13's cooling and insulation work is completed, the eighth solenoid valve 304 closes, and the first solenoid valve 2114 and the second solenoid valve 2115 reset, preparing for subsequent battery 13 insulation work.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A lithium battery low-temperature environment charging and discharging heat preservation device, characterized in that: Includes a battery mechanism (1), the battery mechanism (1) includes a battery box (11), the battery box (11) is provided with a cover plate (12) on the top, the battery box (11) is provided with a plurality of storage batteries (13) inside, and the battery box (11) is provided with a heat preservation mechanism (2). The heat preservation mechanism (2) includes a heat storage and heat preservation unit (21), which is located inside the battery box (11). The heat storage and heat preservation unit (21) can ensure the charging and discharging temperature of the battery (13) in a low-temperature environment by heat storage. The heat storage and heat preservation unit (21) includes a heat preservation box (2101). The bottom surface of the heat preservation box (2101) is fixedly connected to the inner bottom wall of the battery box (11). A heat insulation frame (2102) is fixedly connected to the upper surface of the heat preservation box (2101). The bottom surfaces of several batteries (13) are fixedly connected to the upper surface of the heat insulation frame (2102). A storage box (2121) is fixedly connected to the inner wall of the heat preservation box (2101). An oil storage tank (2103) is fixedly connected to the inner side wall of the storage box (2121). An electric heating wire (2104) is fixedly connected to the inner bottom wall of the storage box (2121). The inner wall of the storage tank (2121) is provided with a heat-conducting coil (2105). The input end of the heat-conducting coil (2105) extends into the interior of the oil storage tank (2103). A delivery pump (2106) is provided on the left side of the insulation box (2101). The right side of the delivery pump (2106) is fixedly connected to the left side of the battery box (11). The output end of the heat-conducting coil (2105) sequentially passes through the storage tank (2121), the insulation box (2101), and the battery box (11). The battery box (11) is fixedly connected to the input end of the delivery pump (2106). The storage box (2121) is filled with heat storage salt. The heating wire (2104) is used to heat the heat storage salt with an external power source when the battery (13) is charging, so that the heat storage salt melts or partially melts to store heat. The heat storage and heat preservation unit (21) can use the heat released by the solidification of the heat storage salt to keep the battery (13) warm when the battery (13) is discharging. The inner wall of the battery box (11) is fixedly connected to an insulation shell (2112). The bottom surface of the insulation shell (2112) is fixedly connected to the upper surface of the heat insulation frame (2102). The inner wall of the insulation shell (2112) is fixedly connected to the outer surface of the limiting plate (2110). An insulation plate (2113) is provided above the insulation shell (2112). The upper surface of the insulation plate (2113) is fixedly connected to the bottom surface of the cover plate (12). The output end of the delivery pump (2106) is fixedly connected to... A connecting pipe (2107) is provided, and a heat-insulating coil (2108) is fitted on the outer surface of each of the batteries (13). The input ends of the heat-insulating coils (2108) are fixedly connected to a conveying pipe (2120). The other end of the conveying pipe (2120) passes through the heat-insulating shell (2112) and the battery box (11) in sequence and is fixedly connected to the connecting pipe (2107). The output ends of the heat-insulating coils (2108) are fixedly connected to a return pipe (2109). One end of (2109) passes through the heat insulation frame (2102), the heat preservation box (2101), and the storage box (2121) in sequence and extends into the interior of the oil storage tank (2103). The outer surfaces of several batteries (13) are jointly snapped onto a limiting plate (2110). Four temperature sensors (2111) are fixedly connected to the bottom surface of the limiting plate (2110). Each temperature sensor (2111) is electrically connected to the delivery pump (2106) through a wire. The heat conduction coil (2105) delivers... The outer surface of the outlet is fixedly connected to a first solenoid valve (2114). The right side of the first solenoid valve (2114) is fixedly connected to the left side of the battery box (11). The outer surface of the return pipe (2109) is fixedly connected to a second solenoid valve (2115). The bottom surface of the second solenoid valve (2115) is fixedly connected to the upper surface of the heat insulation frame (2102). The first solenoid valve (2114) and the second solenoid valve (2115) are both electrically connected to the temperature sensor (2111) through wires. The heat preservation mechanism (2) also includes a leakage protection unit (22), which is located inside the battery box (11). The leakage protection unit (22) is used to increase the heat storage and heat preservation safety of the heat storage and heat preservation unit (21). A high-temperature protection mechanism (3) is provided on the left side of the heat storage and insulation unit (21). The high-temperature protection mechanism (3) works in conjunction with the insulation mechanism (2). The high-temperature protection mechanism (3) is used to balance the high temperature of the battery (13).

2. The lithium battery low-temperature environment charging and discharging heat preservation device according to claim 1, characterized in that: A power connector (2116) is fixedly installed on the front of the battery box (11). The back of the power connector (2116) passes through the battery box (11) and the insulation shell (2112) and extends to the bottom of the insulation board (2113). The heating wire (2104) is electrically connected to the power connector (2116) through a wire. Two mounting supports (2117) are fixedly connected to both the front and back of the battery box (11).

3. The lithium battery low-temperature environment charging and discharging heat preservation device according to claim 2, characterized in that: The cover plate (12) has a plurality of mounting bolts (2118) internally threaded. The bottom end of each mounting bolt (2118) penetrates into the interior of the battery box (11), and each mounting bolt (2118) is threadedly connected to the battery box (11).

4. The lithium battery low-temperature environment charging and discharging heat preservation device according to claim 2, characterized in that: The outer surface of the heating wire (2104) and the outer surface of the heat-conducting coil (2105) are fixedly connected to a number of stabilizing frames (2119), and the upper and lower surfaces of each stabilizing frame (2119) are fixedly connected to the inner top and inner bottom walls of the storage box (2121).

5. The lithium battery low-temperature environment charging and discharging heat preservation device according to claim 2, characterized in that: The leakage protection unit (22) includes a temporary storage box (2201). The right side of the temporary storage box (2201) is fixedly connected to the left side of the battery box (11). A third solenoid valve (2202) is fixedly connected to the upper surface of the temporary storage box (2201). The other end of the third solenoid valve (2202) is fixedly connected to the outer surface of the connecting pipe (2107). A fourth solenoid valve (2203) is fixedly connected to the outer surface of the connecting pipe (2107). The fourth solenoid valve (2203) is equipped with... The return pipe (2109) is positioned above the third solenoid valve (2202). Its outer surface is fixedly connected to the fifth solenoid valve (2204). The other end of the fifth solenoid valve (2204) is fixedly connected to a suction pipe (2205). The other end of the suction pipe (2205) passes through the insulation shell (2112) and the battery box (11) sequentially and is fixedly connected to the input end of the delivery pump (2106). The outer surface of the return pipe (2109) is fixedly connected to a sixth solenoid valve (2206). An electronic pressure gauge (2207) is fixedly connected to the outer surface of the delivery pipe (2120). Several guide grooves (2208) are opened on the upper surface of the heat insulation frame (2102). A seventh solenoid valve (2210) is fixedly connected to the outer surface of the input end of the delivery pump (2106). The right side of the seventh solenoid valve (2210) is fixedly connected to the left side of the battery box (11). The third solenoid valve (2202), the fourth solenoid valve (2203), the fifth solenoid valve (2204), and the sixth solenoid valve are fixedly connected to the outer surface of the delivery pipe (2120). Both valve (2206) and the seventh solenoid valve (2210) are electrically connected to the electronic pressure gauge (2207) via wires. The other end of the seventh solenoid valve (2210) is fixedly connected to a drain pipe (2209). The other end of the drain pipe (2209) passes through the battery box (11) and the heat insulation frame (2102) in sequence and is fixedly connected to the guide groove (2208). The other end of the return pipe (2109) passes through the heat insulation frame (2102) and is fixedly connected to the outer surface of the drain pipe (2209).

6. The lithium battery low-temperature environment charging and discharging heat preservation device according to claim 5, characterized in that: The upper surface of the temporary storage box (2201) is fixedly connected to a pressure relief valve (2211), and the left side of the temporary storage box (2201) is fixedly connected to a drain valve (2212).

7. The lithium battery low-temperature environment charging and discharging heat preservation device according to claim 6, characterized in that: The high-temperature protection mechanism (3) includes a protective cover (301). The right side of the protective cover (301) is fixedly connected to the left side of the battery box (11). The delivery pump (2106), the first solenoid valve (2114), the third solenoid valve (2202), the fourth solenoid valve (2203), and the seventh solenoid valve (2210) are all located inside the protective cover (301). The outer surface of the temporary storage box (2201) is fixedly connected to the inner wall of the protective cover (301). The drain valve (2212) extends through to the left side of the protective cover (301). Several exhaust slots (309) are provided on the left side of the protective cover (301). A heat dissipation coil (302) is provided inside the protective cover (301). The outer surface of the heat dissipation coil (302) is fixedly connected to equidistantly arranged heat-conducting copper sheets (303). The left side of each heat-conducting copper sheet (303) is connected to the protective cover (301). The right side of the 01) is fixedly connected, the input end of the heat dissipation coil (302) is fixedly connected to the eighth solenoid valve (304), the other end of the eighth solenoid valve (304) is fixedly connected to the outer surface of the connecting pipe (2107), the eighth solenoid valve (304) is located between the third solenoid valve (2202) and the fourth solenoid valve (2203), the eighth solenoid valve (304) is electrically connected to the temperature sensor (2111) through a wire, the output end of the heat dissipation coil (302) is fixedly connected to the one-way valve (305), the output end of the one-way valve (305) is fixedly connected to the outer surface of the conveying pipe (2120), the inner wall of the protective cover (301) is fixedly connected to the limit frame (306), the inner wall of the limit frame (306) is fixedly connected to several fixed cylinders (307), and the inner walls of several fixed cylinders (307) are all fixedly connected to the heat dissipation fan (308).

8. The lithium battery low-temperature environment charging and discharging heat preservation device according to claim 7, characterized in that: Each of the fixed cylinders (307) has a baffle (310) fixedly connected to its inner wall. Each baffle (310) is located on the left side of the cooling fan (308). Each baffle (310) has equidistant ventilation holes (311) on its left side.

9. A method of using a lithium battery low-temperature environment charging and discharging insulation device according to any one of claims 1-8, characterized in that: Specifically, it includes the following steps; S1: First, connect the heating wire (2104), delivery pump (2106), temperature sensor (2111), first solenoid valve (2114), second solenoid valve (2115), third solenoid valve (2202), fourth solenoid valve (2203), fifth solenoid valve (2204), sixth solenoid valve (2206), electronic pressure gauge (2207), seventh solenoid valve (2210), eighth solenoid valve (304), and cooling fan (308) to an external controller. When the battery (13) is charged in a low-temperature environment through the charging socket (2116), the temperature inside the battery box (11) is detected by the temperature sensor (2111). When the temperature inside the battery box (11) reaches a certain level, the battery box (11) will be charged. At lower temperatures, the heating wire (2104) and the delivery pump (2106) are connected to an external power source via the junction box (2116). The heating wire (2104) generates heat, which is then pumped out of the oil tank (2103) through the heat-conducting coil (2105) via the delivery pump (2106). When the heat-conducting oil passes through the heat-conducting coil (2105), the heat provided by the heating wire (2104) heats the heat-conducting oil. Then, when the heat-conducting oil enters the insulation coil (2108) through the delivery pump (2106), the connecting pipe (2107), and the delivery pipe (2120), the temperature around the battery (13) is rapidly increased by heat conduction, so that it reaches a more appropriate charging temperature. S2: When the battery (13) reaches a suitable temperature, the delivery pump (2106) stops working, and the first solenoid valve (2114) and the second solenoid valve (2115) are closed. With the help of the heat insulation frame (2102), the heat will not continue to be directed to the battery (13) through the heat insulation box (2101). At this time, the heating wire (2104) continues to heat the heat storage salt that was pre-filled in the storage box (2121) to a melted or semi-melted state, thereby using the solid-liquid conversion of the heat storage salt to store a large amount of heat. At the same time, the heat insulation box (2101) is used in conjunction with the storage box (2121), the first solenoid valve (2114), and the second solenoid valve (2115) to form a relatively closed heat storage space, reducing the rate of heat loss. Then, when the battery (13) is fully charged, the storage box (2106) stops working. 121) The battery (13) also stores a lot of heat, so that if the low temperature environment causes the battery (13) to be too low again during the discharge process of the battery (13) for a long time, affecting the discharge effect, the battery (13) only needs to provide less electrical energy than continuous heating to drive the transfer pump (2106). The heat released by the heat storage salt inside the storage tank (2121) during the process of liquid solidification is transported to the outside of the battery (13) through the connecting pipe (2107), the transfer pipe (2120) and the heat insulation coil (2108) for heat preservation. Finally, the heat transfer oil flows back to the oil tank (2103) through the return pipe (2109) for recycling. This allows the battery (13) to not only ensure the charging temperature when charging in a low temperature environment, but also to store a lot of heat. S3: By utilizing the solid-liquid conversion of the heat storage salt to release heat to the outside for a long time, the battery (13) can maintain its discharge temperature during a relatively long period of discharge without consuming too much of its own electrical energy. This improves the charging and discharging efficiency of the battery (13) in low-temperature environments and ensures the performance of the battery (13) in low-temperature environments. Even after the heat storage salt has completely cooled down, the battery (13) only needs to use electrical energy in conjunction with the heating wire (2104) to reheat the heat storage salt. It can store a large amount of heat again to achieve discharge and heat preservation in low temperature environment without the need to continuously provide power for high-energy-consuming electric heating and heat preservation, thereby effectively ensuring the overall endurance of the battery (13) in low temperature environment. Furthermore, the battery box (11) in conjunction with the heat preservation shell (2112) and heat preservation plate (2113) can further increase the heat preservation performance of the battery (13), making the heat loss rate of the battery (13) in low temperature environment slower, and making the battery (13) less susceptible to low temperature effects when charging and discharging in low temperature environment. S4: The pressure inside the insulation coil (2108) and the delivery pipe (2120) is monitored by the electronic pressure gauge (2207). When the temperature of the heat transfer oil inside the insulation coil (2108) and the delivery pipe (2120) increases, its pressure gradually increases, and when the temperature decreases, the pressure gradually decreases. Thus, the pressure value changes relatively slowly. When the pressure value drops sharply, it proves that the insulation coil (2108), the connecting pipe (2107), or the delivery pipe (2120) has been damaged due to external collisions and impacts, resulting in leakage of the heat transfer oil inside. At this time, the electronic pressure gauge (2207) controls the first solenoid valve (2114) and the second solenoid valve (2115) to... When the valve is closed, the third solenoid valve (2202), the fifth solenoid valve (2204), and the seventh solenoid valve (2210) open, while the fourth solenoid valve (2203) and the sixth solenoid valve (2206) close. The transfer pump (2106) starts working and quickly draws the heat transfer oil inside the insulation coil (2108) and the transfer pipe (2120) out through the suction pipe (2205), the fifth solenoid valve (2204), and the return pipe (2109). The heat transfer oil is then sent into the temporary storage tank (2201) for collection through the closed fourth solenoid valve (2203) in conjunction with the open third solenoid valve (2202), instead of continuing to send it back into the storage tank (2121) for further circulation. S5: Furthermore, the heat transfer oil leaking from the insulation coil (2108) and the delivery pipe (2120) will also flow into the guide groove (2208) on the heat insulation rack (2102), and then through the guide pipe (2209) connected to the guide groove (2208), it can also be sucked by the delivery pump (2106) and sent to the temporary storage box (2201), thereby preventing the heat transfer oil used for heating and insulation from leaking and corroding the battery (13). Even if the heat transfer oil leaks due to collision or bump during the heating and insulation process, the heat transfer oil will not be directly soaked in the outside of the battery (13), thereby preventing the heat transfer oil from soaking too much into the inside of the battery (13) and causing short circuit damage to the battery (13), thus increasing the heating and insulation safety and reliability of the battery (13). S6: When the temperature sensor (2111) detects that the internal temperature of the battery box (11) is too high and affects the charging and discharging safety of the battery (13), the temperature sensor (2111) controls the first solenoid valve (2114), the second solenoid valve (2115), the seventh solenoid valve (2210), the sixth solenoid valve (2206), the third solenoid valve (2202), and the fourth solenoid valve (2203) to close, and the fifth solenoid valve (2204) and the eighth solenoid valve (304) to open. At the same time, the cooling fan (308) starts to work, and then the insulation coil (2108) and the conveying pipe... The heat transfer oil inside (2120) and the return pipe (2109) no longer flows into the storage tank (2121) for heating and circulation. Instead, it is sent by the delivery pump (2106) through the eighth solenoid valve (304) into the heat dissipation coil (302). At this time, the air force provided by the cooling fan (308), together with the fixed cylinder (307) and the limit bracket (306), can draw outside air into the protective cover (301) and make the air blow over the heat dissipation coil (302) and the heat-conducting copper sheet (303) and then be discharged outward from the exhaust groove (309), so that the heat transfer oil flows through the heat dissipation coil (2120) and the return pipe (2109). When the temperature of the heat transfer oil inside the heat dissipation coil (302) is reduced, and when the heat transfer oil inside the heat dissipation coil (302) finally flows back into the insulation coil (2108) through the delivery pipe (2120) via the one-way valve (305) for circulation, the temperature around the battery (13) can be effectively reduced. This allows the battery (13) to be charged and discharged in a low-temperature environment while maintaining its temperature, and further balances the operating temperature of the battery (13). When the operating temperature of the battery (13) is too high and affects the safety of the battery (13), the battery (13) can be cooled down in time. This ensures that the battery (13) can always be kept in a very suitable operating temperature range, further ensuring the charging and discharging heat preservation effect of the battery (13). Furthermore, the cooling heat transfer oil circulation loop of the battery (13) is different from the heating heat transfer oil circulation loop, so it will not affect the heat storage work of the heat storage salt inside the storage tank (2121). After the cooling and heat preservation work of the battery (13) is completed, the eighth solenoid valve (304) is closed, and the first solenoid valve (2114) and the second solenoid valve (2115) are reset, preparing for the subsequent heat preservation work of the battery (13).

Images