Lithium battery charging and discharging heat preservation device and method in low-temperature environment

Abstract

The invention discloses a lithium battery low-temperature environment charging and discharging heat preservation device and method, and relates to the technical field of lithium batteries, the lithium battery low-temperature environment charging and discharging heat preservation device comprises a battery mechanism, 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; according to the lithium battery charging and discharging heat preservation device and method in the low-temperature environment, when the storage battery is charged and discharged in the low-temperature environment, the charging temperature can be guaranteed, heat is released outwards for a long time through solid-liquid conversion of heat storage salt, and the heat preservation efficiency is improved; the temperature of the storage battery during discharging can be ensured under the condition that the electric energy of the storage battery is not consumed too much in the subsequent discharging process of the storage battery for a long period of time, so that the charging and discharging efficiency of the storage battery in a low-temperature environment is improved, and the using effect of the storage battery in the low-temperature environment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a device and method for keeping a lithium battery charged and discharged in a low-temperature environment. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive and negative electrode materials and a non-aqueous electrolyte solution. Because lithium batteries have good discharge stability and are smaller in size than lead-acid batteries, they have a wide range of uses. However, when lithium batteries are used in low-temperature environments, the viscosity of the electrolyte inside the lithium battery increases, and the migration rate of ions slows down, which leads to an increase in the internal resistance of the battery. For example, in an environment of around minus 20 degrees Celsius, the internal resistance of the battery may increase several times compared to normal temperature. The increase in internal resistance increases the ohmic loss during the charging and discharging process, which significantly reduces the charging and discharging efficiency, significantly prolongs the charging time, and greatly reduces the amount of power that can be output during discharge, seriously affecting the endurance of the equipment and causing interruptions or other abnormalities in the charging and discharging process of the battery. In order to ensure the charging and discharging stability of lithium batteries in low-temperature environments, lithium batteries need to be kept warm using insulation measures.

[0003] When in use, the existing low-temperature charging and discharging insulation device for lithium batteries mainly adopts electric heating to heat and insulate the lithium batteries to maintain a suitable charging and discharging temperature. However, the discharge working time of the lithium battery is relatively long. If the lithium battery is heated and insulated by electric heating for a long time, although the working temperature of the lithium battery during discharge can be maintained, the power consumption of the lithium battery is greatly increased, resulting in a serious decline in the battery life of the lithium battery in a low-temperature environment. As a result, the use effect of the low-temperature charging and discharging insulation device for lithium batteries is not ideal, and the charging and discharging efficiency of the lithium battery in a low-temperature environment cannot be better guaranteed.

[0004] Combining the above problems, we will find that it is difficult to avoid the above problems at the same time when using the existing lithium battery charging and discharging insulation device, and even if it can be solved, it needs to be solved with the cooperation of external tools, which makes it impossible to achieve the desired effect. Therefore, we propose a lithium battery charging and discharging insulation device and method in a low-temperature environment. Summary of the Invention

[0005] The object of the present invention is to provide a device and method for heat preservation of lithium battery charging and discharging in a low temperature environment, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a lithium battery low-temperature environment charging and discharging insulation device, comprising a battery mechanism, the battery mechanism comprising a battery box, a cover plate is provided above the battery box, a plurality of storage batteries are provided inside the battery box, and an insulation mechanism is provided inside the battery box; The heat preservation mechanism includes a heat storage and heat preservation unit, which is arranged inside the battery box and can ensure the charging and discharging temperature of the battery in a low temperature environment by storing heat; The heat preservation mechanism further includes a leakage protection unit, which is arranged inside the battery box and is used to increase the heat storage and heat preservation safety of the heat storage and heat preservation unit; A high-temperature protection mechanism is provided on the left side of the heat storage and heat preservation unit. The high-temperature protection mechanism is used in conjunction with the heat preservation mechanism and is used to balance the high temperature of the battery.

[0007] As a preferred solution of the low temperature environment charging and discharging insulation device of the lithium battery of the present invention, wherein: the heat storage and heat preservation unit includes a heat preservation box, the bottom surface of the heat preservation box is fixedly connected to the inner bottom wall of the battery box, the upper surface of the heat preservation box is fixedly connected to a heat insulation frame, the bottom surfaces of several batteries are fixedly connected to the upper surface of the heat insulation frame, the inner wall of the heat preservation box is fixedly connected to a storage box, the inner side wall of the storage box is fixedly connected to an oil storage tank, the inner bottom wall of the storage box is fixedly connected to a heating wire, and the inner wall of the storage box is provided with a heat conductive Coil, the input end of the heat-conducting coil passes through the interior of the oil storage tank, a delivery pump is provided on the left side of the insulation box, 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 passes through the storage box, the insulation box and the battery box in sequence and is fixedly connected to the input end of the delivery pump, the inner wall of the battery box is fixedly connected to the insulation shell, the bottom surface of the insulation shell is fixedly connected to the upper surface of the insulation frame, the inner wall of the insulation shell is fixedly connected to the outer surface of the limit plate, and an insulation plate is provided above the insulation shell. The upper surface of the 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 of the batteries are all sleeved with insulation coils, the input ends of several of the insulation coils are commonly fixedly connected to a delivery pipe, the other ends of the delivery pipes pass through the insulation shell and the battery box in sequence and are fixedly connected to the connecting pipe, the output ends of several of the insulation coils are commonly fixedly connected to a return pipe, one end of the return pipe passes through the insulation frame, the insulation box and the storage box in sequence and extends to the interior of the oil storage tank, the outer surfaces of several of the batteries are commonly clamped with a limit plate, the bottom surface of the limit plate is fixedly connected to four temperature sensors, each of the temperature sensors 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 insulation frame, and the first solenoid valve and the second solenoid valve are both electrically connected to the temperature sensor through a wire.

[0008] As a preferred solution of the lithium battery low-temperature environment charging and discharging insulation device described in the present invention, the front of the battery box is fixedly installed with a power socket, the back of the power socket passes through the battery box and the insulation shell in sequence and extends to the bottom of the insulation plate, the heating wire is electrically connected to the power socket through a wire, and the front and back of the battery box are fixedly connected to two mounting supports.

[0009] As a preferred solution of the lithium battery low-temperature environment charging and discharging insulation device described in the present invention, the internal thread of the cover plate is connected to a plurality of mounting bolts, the bottom end of each mounting bolt passes through the interior of the battery box, and each mounting bolt is threadedly connected to the battery box.

[0010] As a preferred solution of the lithium battery low-temperature charging and discharging insulation device described in the present invention, the outer surface of the heating wire and the outer surface of the heat-conducting coil are fixedly connected to a plurality of stabilizing frames, and the upper surface and bottom surface of each of the stabilizing frames are fixedly connected to the inner top wall and inner bottom wall of the storage box.

[0011] As a preferred solution of the low-temperature environment charging and discharging insulation device for lithium batteries of the present invention, wherein: the leakage protection unit includes a temporary storage box, the right side of the temporary storage box is fixedly connected to the left side of the battery box, the upper surface of the temporary storage box is fixedly connected to a third solenoid valve, the other end of the third solenoid valve is fixedly connected to the outer surface of the connecting pipe, the outer surface of the connecting pipe is fixedly connected to a fourth solenoid valve, the fourth solenoid valve is arranged above the third solenoid valve, the outer surface of the return pipe is fixedly connected to a fifth solenoid valve, the other end of the fifth solenoid valve is fixedly connected to a suction pipe, 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, the return pipe is fixedly connected to the fifth solenoid valve, the other end of the fifth solenoid valve is fixedly connected to the ... The outer surface of the flow tube is fixedly connected to a sixth solenoid valve, the outer surface of the delivery pipe is fixedly connected to an electronic pressure gauge, the upper surface of the thermal insulation frame is provided with a plurality of guide grooves, the outer surface of the delivery pump input end is fixedly connected to a seventh solenoid valve, the right side of the seventh solenoid valve is fixedly connected to the left side of the battery box, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve and the seventh solenoid valve are all electrically connected to the electronic pressure gauge through wires, the other end of the seventh solenoid valve is fixedly connected to a drainage tube, the other end of the drainage tube passes through the battery box and the thermal insulation frame in sequence and is fixedly connected to the guide groove, and the other end of the return pipe passes through the thermal insulation frame and is fixedly connected to the outer surface of the drainage tube.

[0012] As a preferred solution of the lithium battery low temperature environment charging and discharging insulation device of the present invention, the upper surface of the temporary storage box is fixedly connected to a pressure relief valve, and the left side of the temporary storage box is fixedly connected to a drain valve.

[0013] As a preferred solution of the low-temperature environment charging and discharging insulation device for lithium batteries of the present invention, wherein: the high-temperature protection mechanism includes a protective cover, the right side of the protective cover 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 arranged 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 to the left side of the protective cover, a plurality of exhaust slots are provided on the left side of the protective cover, a heat dissipation coil is provided inside the protective cover, and the outer surface of the heat dissipation coil is fixedly connected to heat-conducting copper sheets arranged at equal distances, each of the conductive The left side of the hot copper plate is fixedly connected to the right side of the protective cover, the input end of the heat dissipation coil is fixedly connected to the 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 arranged between the third solenoid valve and the fourth solenoid valve, the eighth solenoid valve is electrically connected to the temperature sensor through a wire, the output end of the heat dissipation coil is fixedly connected to the 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 the limit frame, the inner wall of the limit frame is fixedly connected to a number of fixed cylinders, and the inner walls of the several fixed cylinders are fixedly connected to the cooling fan.

[0014] As a preferred solution of the lithium battery low-temperature charging and discharging insulation device of the present invention, the inner walls of several of the fixed cylinders are fixedly connected with baffles, each of the baffles is arranged on the left side of the heat dissipation fan, and the left side of each baffle is provided with air holes arranged at equal distances.

[0015] A method for using a lithium battery low-temperature environment charging and discharging heat preservation device, specifically comprising the following steps: 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 the external controller. When charging the battery in a low-temperature environment through the power socket, the temperature inside the battery box can be detected by the temperature sensor. When the temperature inside the battery box is low, the heating wire and the delivery pump can also be connected to the external power supply through the power socket. The heating wire generates heat, and then the delivery pump is used to pump the thermal oil inside the oil storage tank out through the heat conduction coil. When the thermal oil passes through the heat conduction coil, the heat provided by the heating wire will heat the thermal oil. Then, when the thermal oil passes through the delivery pump and the connecting pipe, and the delivery pipe enters the interior of the insulation coil, the temperature around the battery can be quickly increased by heat conduction, so that it reaches a more appropriate charging temperature. S2: When the battery reaches the appropriate temperature, the delivery pump stops working, and the first solenoid valve and the second solenoid valve are closed, and the heat insulation frame is used to prevent the heat from continuing to be transferred to the battery through the thermal insulation box. At this time, the electric heating wire continues to heat, heating the heat storage salt pre-filled in the storage box to a melted or semi-melted state, thereby utilizing the solid-liquid conversion of the heat storage salt to store a large amount of heat. At the same time, the thermal insulation box, the storage box, the first solenoid valve and the second solenoid valve can form a relatively closed heat storage space, reducing the speed of heat loss. When the battery is fully charged, a large amount of heat is stored in the storage box. The amount of heat is measured. When the battery is subsequently discharged for a long period of time, if the low temperature environment causes the battery temperature to drop too low again and affects the discharge effect, the battery only needs to provide less electricity to drive the delivery pump compared to continuous heating. The heat released by the heat storage salt inside the storage tank during the solidification process of the liquid is transported to the outside of the battery through the connecting pipe, delivery pipe and insulation coil for insulation. Finally, the heat transfer oil flows back to the oil storage tank through the return pipe for recycling. When the battery is charged in a low temperature environment, it can not only maintain the charging temperature but also store a large amount of heat. S3: The solid-liquid conversion of the heat storage salt is used to release heat to the outside for a long time, so that the battery can maintain the temperature of the battery during discharge without consuming too much of the battery's own electrical energy during the subsequent discharge process for a long period of time, thereby improving the charging and discharging efficiency of the battery in a low-temperature environment and ensuring the use effect of the battery in a warm environment. Even after the heat storage salt is completely cooled, the battery only needs to use electricity and the heating wire to heat the heat storage salt again to store a large amount of heat again to achieve discharge and heat preservation in a low-temperature environment. There is no need to continuously provide electricity for high-energy electric heating and heat preservation, thereby effectively ensuring the overall endurance of the battery in a low-temperature environment. In addition, the battery box with an insulation shell and an insulation board can further increase the thermal insulation performance of the battery, making the heat loss rate of the battery in a low-temperature environment slower, making the battery less susceptible to low-temperature effects when charging and discharging in a low-temperature environment. S4: The pressure value 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 becomes higher, the pressure will gradually increase, and when the temperature decreases, the pressure will gradually decrease, and the change in the pressure value will be a relatively gentle rise or fall. When the pressure value drops suddenly, it proves that the insulation coil, the connecting pipe or the delivery pipe is damaged due to external collision and bump, resulting in leakage of the heat transfer oil inside. At this time, the electronic pressure gauge can control the first solenoid valve and the second solenoid valve to actively close, and the third solenoid valve, the fifth solenoid valve and the seventh solenoid valve to open, while the fourth solenoid valve and the sixth solenoid valve are closed, and the delivery pump starts to work, and the heat transfer oil inside the insulation coil and the delivery pipe is quickly pumped out through the suction pipe, the fifth solenoid valve and the return pipe, and the heat transfer oil is sent to the temporary storage box for collection through the closed fourth solenoid valve and the opened third solenoid valve, instead of continuing to send it back to the storage box for continued circulation; S5: The heat transfer oil leaking from the insulation coil and the delivery pipe will also flow into the guide groove on the insulation frame, and then be sucked into the delivery pump through the drainage pipe connected to the guide groove and sent to the temporary storage box, thereby preventing 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 bumping during the heating and insulation process, the heat transfer oil will not be directly soaked outside the battery, thereby preventing excessive heat transfer oil from seeping into the battery and causing short circuit damage to the battery, thereby increasing the safety and reliability of the battery heating and insulation. S6: When the temperature sensor detects that the temperature inside the battery box is too high and affects the safety of battery charging and discharging, the temperature sensor can control the first solenoid valve, the second solenoid valve, the seventh solenoid valve, the sixth solenoid valve, the third solenoid valve and the fourth solenoid valve to close, and the fifth solenoid valve and the eighth solenoid valve to open, and the cooling fan starts to work at the same time, so that the heat transfer oil inside the insulation coil, the delivery pipe and the return pipe no longer flows into the storage box for heating circulation, but is sent into the heat transfer coil by the delivery pump through the eighth solenoid valve. At this time, the wind force provided by the cooling fan cooperates with the fixed tube and the limit frame to draw the outside air into the protective cover, and make the air blow through the heat transfer coil and the thermal copper sheet and then be discharged from the exhaust slot to the outside, so that the temperature of the heat transfer oil can be reduced when flowing through the heat transfer coil, and then when the heat transfer oil inside the heat transfer coil finally passes through When the one-way valve flows into the insulation coil again through the delivery pipe for circulation, the temperature around the battery can be effectively reduced, so that the battery can be charged and discharged in a low-temperature environment and the operating temperature of the battery can be further balanced. When the operating temperature of the battery is high and affects the safety of the battery, the battery can be cooled in time to ensure that the battery can always be maintained in a very suitable operating temperature range, further ensuring the charging and discharging insulation effect of the battery. The cooling thermal oil circulation loop of the battery is different from the heating and insulation thermal oil circulation loop, and will not affect the heat storage work of the heat storage salt inside the storage box. When the battery cooling and insulation work is completed, the eighth solenoid valve is closed, and the first solenoid valve and the second solenoid valve are reset to prepare for the subsequent battery insulation work.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is provided with a heat storage and heat preservation unit, which can use an external power supply to heat and keep the battery warm when the battery is charging, so that the battery is at a suitable charging temperature in a low-temperature environment, preventing the charging temperature from being too low and affecting the battery storage effect. In addition, a large amount of heat can be stored by heating and melting the heat storage salt, so that when the battery is charged in a low-temperature environment, it can not only maintain the charging temperature but also store a large amount of heat. The solid-liquid conversion of the heat storage salt is used to release heat to the outside for a long time, so that during the subsequent discharge process over a long period of time, the battery temperature during discharge can be maintained without consuming too much of the battery's own electrical energy, thereby improving the charging and discharging efficiency of the battery in a low-temperature environment and ensuring the use effect of the battery in a low-temperature environment.

[0017] 2. The present invention is capable of preventing the thermal oil used for heating and heat preservation from leaking and corroding the battery by providing a leakage protection unit. Even if the thermal oil leaks due to collision or bumping during the heating and heat preservation process, the thermal oil will not be directly soaked outside the battery, thereby preventing excessive thermal oil from penetrating into the battery and causing short-circuit damage to the battery, thereby increasing the heating and heat preservation safety and reliability of the battery.

[0018] 3. By setting up a high-temperature protection mechanism, the present invention can cooperate with the heat storage and insulation unit to further balance the operating temperature of the battery while performing charging, discharging and heat preservation on the battery in a low-temperature environment. When the operating temperature of the battery is high and affects the safety of the battery, the battery can be cooled in time, so that the battery can always be maintained in a very suitable operating temperature range, further ensuring the charging, discharging and heat preservation effect of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic structural diagram of a cross-section of the cover plate, insulation shell, and insulation plate of the present invention; Figure 3 This is a schematic structural diagram of a cross-section of the battery box of the present invention; Figure 4 This is a schematic diagram of the structure of the limit plate and the heat insulation frame after being expanded in cross section; Figure 5 This is a schematic structural diagram of the heat preservation coil, delivery pipe and return pipe of the present invention; Figure 6 It is a schematic structural diagram of a cross-section of the heat preservation box and the storage box of the present invention; Figure 7 It is a schematic structural diagram of a cross-section of the heat insulation frame of the present invention; Figure 8 It is a schematic structural diagram of a cross-section of the protective cover of the present invention; Figure 9 This is a schematic diagram of the structure of the fixed cylinder, heat dissipation fan and baffle after they are unfolded; Figure 10 It is a structural schematic diagram of the heat dissipation coil of the present invention.

[0020] In the figure: 1. battery mechanism; 11. battery box; 12. cover plate; 13. battery; 2. heat preservation mechanism; 21. heat storage and heat preservation unit; 2101. heat preservation box; 2102. heat insulation frame; 2103. oil storage tank; 2104. heating wire; 2105. heat conduction coil; 2106. delivery pump; 2107. connecting pipe; 2108. heat insulation coil; 2109. return pipe; 2110. limit plate; 2111. temperature sensor; 2112. heat preservation shell; 2113. heat preservation plate; 2114. first solenoid valve; 2115. second solenoid valve; 2116. connection socket; 2117. mounting support; 2118. mounting bolt; 2119. stabilizing frame; 2120. delivery pipe; 2 121. Storage box; 22. Leakage protection unit; 2201. Temporary storage box; 2202. Third solenoid valve; 2203. Fourth solenoid valve; 2204. Fifth solenoid valve; 2205. Suction pipe; 2206. Sixth solenoid valve; 2207. Electronic pressure gauge; 2208. Diversion trough; 2209. Drainage pipe; 2210. Seventh solenoid valve; 2211. Pressure relief valve; 2212. Drain valve; 3. High-temperature protection mechanism; 301. Protective cover; 302. Heat dissipation coil; 303. Thermal conductive copper sheet; 304. Eighth solenoid valve; 305. One-way valve; 306. Limiting frame; 307. Fixing cylinder; 308. Heat dissipation fan; 309. Exhaust slot; 310. Baffle; 311. Air vent. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "one embodiment" or "embodiment" 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 various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0024] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0025] Example 1: Please refer to Figures 1-6 The present invention provides a technical solution: a lithium battery charging and discharging insulation device in a low-temperature environment, comprising a battery mechanism 1, the battery mechanism 1 comprising a battery box 11, a cover plate 12 being provided above the battery box 11, a plurality of storage batteries 13 being provided inside the battery box 11, and a heat preservation mechanism 2 being provided inside the battery box 11; The heat preservation mechanism 2 includes a heat storage and heat preservation unit 21 , which is disposed 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.

[0026] As a further limitation of the heat preservation mechanism 2 of the present invention, the heat storage and heat preservation unit 21 includes an insulation box 2101, the bottom surface of the insulation box 2101 is fixedly connected to the inner bottom wall of the battery box 11, the upper surface of the insulation box 2101 is fixedly connected to the insulation frame 2102, the bottom surfaces of several batteries 13 are fixedly connected to the upper surface of the insulation frame 2102, the inner wall of the insulation box 2101 is fixedly connected to the storage box 2121, the inner side wall of the storage box 2121 is fixedly connected to the oil storage tank 2103, the inner bottom wall of the storage box 2121 is fixedly connected to the heating wire 2104, the inner wall of the storage box 2121 is provided with a heat conducting coil 2105, the input end of the heat conducting coil 2105 passes through the interior of the oil storage tank 2103, and a delivery pump 2 is provided on the left side of the insulation 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, the inner wall of the battery box 11 is fixedly connected with an insulation shell 2112, the bottom surface of the insulation shell 2112 is fixedly connected to the upper surface of the insulation frame 2102, the inner wall of the insulation shell 2112 is fixedly connected to the outer surface of the limit plate 2110, and 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 with a connecting pipe 2107, and the outer surfaces of several batteries 13 are all provided with insulation coils 2108, the input ends of several heat-insulating coils 2108 are fixedly connected with 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 with the connecting pipe 2107, the output ends of several heat-insulating coils 2108 are fixedly connected with a return pipe 2109, one end of the return pipe 2109 passes through the heat-insulating frame 2102, the heat-insulating box 2101 and the storage box 2121 in sequence and extends to the interior of the oil storage tank 2103, the outer surfaces of several batteries 13 are commonly clamped with a limit plate 2110, the bottom surface of the limit plate 2110 is fixedly connected with four temperature sensors 2111, each temperature sensor 2111 is electrically connected to the delivery pump 2106 through a wire, and the heat-conducting coil 2105 is output. 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 a wire, and by providing a heat storage and heat preservation unit 21, the battery 13 can be heated and kept warm by using an external power supply when the battery 13 is 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 storage effect of the battery 13, and a large amount of heat can be stored by heating and melting the heat storage salt.When charging the battery 13 in a low-temperature environment, the charging temperature can be maintained and a large amount of heat can be stored. The solid-liquid conversion of the heat storage salt is used to release the heat to the outside for a long time. In the subsequent discharge process of the battery 13 for a long period of time, the temperature of the battery 13 during discharge can be maintained without consuming too much of the battery's own energy. This improves the charging and discharging efficiency of the battery 13 in a low-temperature environment and ensures the use effect of the battery 13 in a warm environment. The front of the battery box 11 is fixedly installed with a power socket 2116. The back of the power socket 2116 passes through the battery box 11 and the insulation shell 2112 in sequence and extends to the bottom of the insulation plate 2113. The heating wire 2104 is electrically connected to the power socket 2116 through a wire. Two mounting brackets 2117 are fixedly connected to the front and back of the battery box 11. The power socket 2116 can ensure that the battery 13 is smoothly connected to the external power supply and that the charging and discharging of the battery 13 proceeds normally. The mounting brackets 2117 can be used with tools such as bolts to fix the battery box 11, ensuring that the battery box 11 is installed firmly and conveniently. The cover plate 12 is internally threaded with a plurality of mounting bolts 2118. The bottom end of each mounting bolt 2118 extends through the interior of the battery box 11. Each mounting bolt 2118 is threadedly connected to the battery box 11. The mounting bolts 2118 can be used to fix the cover plate 12 to the top of the battery box 11, thereby increasing the tightness of the installation between the cover plate 12 and the battery box 11. When the cover plate 12 needs to be opened to inspect the internal facilities of the battery box 11, the cover plate 12 can also be opened more conveniently by removing the mounting bolts 2118. The outer surface of the heating wire 2104 and the outer surface of the heat-conducting coil 2105 are fixedly connected with a number of stabilizing frames 2119. The upper surface and bottom surface of each stabilizing frame 2119 are fixedly connected to the inner top wall and inner bottom wall of the storage box 2121. The stabilizing frames 2119 can fix the heating wire 2104 and the heat-conducting coil 2105 in the internal position of the storage box 2121, and can increase the overall structural strength of the storage box 2121, thereby improving the pressure-bearing capacity of the storage box 2121.

[0027] 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 the external controller. When the battery 13 is charged in a low temperature environment through the power socket 2116, the temperature inside the battery box 11 can be detected by the temperature sensor 2111. When the temperature inside the battery box 11 is low, the heating wire 2104 and the delivery pump 2106 can also be connected to the external power supply through the power socket 2116. The heating wire 2104 generates heat, and then the heat-conducting oil inside the oil storage tank 2103 is pumped out through the heat-conducting coil 2105 by the delivery pump 2106. When the heat-conducting oil passes through the heat-conducting coil 2105, the heating wire The heat provided by 2104 will heat the heat transfer oil. Then, when the heat transfer oil passes through the delivery pump 2106, the connecting pipe 2107, and the delivery pipe 2120 and enters the interior of the insulation coil 2108, it can use heat conduction to quickly increase the temperature around the battery 13, so that it reaches a more appropriate charging temperature. When 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 are closed. In conjunction with the heat insulation frame 2102, the heat will not continue to be conducted to the battery 13 through the insulation box 2101. At this time, the electric heating wire 2104 continues to heat, heating the heat storage salt pre-filled in the storage box 2121 to a melted or semi-melted state, thereby utilizing the solid-liquid conversion of the heat storage salt to store a large amount of heat. At the same time, the thermal insulation box 2101, the storage box 2121, the first solenoid valve 2114 and the second solenoid valve 2115 can form a relatively closed heat storage space, reducing the speed of heat loss to the outside. When the battery 13 is fully charged, a large amount of heat is also stored in the storage box 2121. When the battery 13 is subsequently discharged for a long period of time, if the low temperature environment again causes the temperature of the battery 13 to be too low and affects the discharge effect, the battery 13 only needs to provide less electricity than continuous heating to drive the delivery pump 2106, so that the heat released by the heat storage salt in the storage box 2121 during the process of solidifying from liquid to solid is delivered to the outside through the connecting pipe 2107, the delivery pipe 2120 and the thermal insulation coil 2108. The outside of the battery 13 is kept warm, and the heat-conducting oil finally flows back to the oil storage tank 2103 through the return pipe 2109 for recycling, so that the battery 13 can not only maintain the charging temperature when charging in a low-temperature environment, but also store a large amount of heat, and use the solid-liquid conversion of the heat storage salt to release heat to the outside for a long time, so that the battery 13 can maintain the temperature when discharging without consuming too much of its own electric energy during the subsequent discharge process for a long period of time, thereby improving the charging and discharging efficiency of the battery 13 in a low-temperature environment and ensuring the use effect of the battery 13 in a warm environment. Even after the heat storage salt is completely cooled, the battery 13 only needs to use electric energy in conjunction with the heating wire 2104 to heat the heat storage salt again.A large amount of heat can be stored again to achieve discharge and heat preservation in low-temperature environments, eliminating the need to continuously provide electricity for high-energy-consuming electric heating and heat preservation, thereby effectively ensuring the overall endurance of the battery 13 in low-temperature environments. In addition, the battery box 11, in conjunction with the insulation shell 2112 and the insulation plate 2113, can further enhance the heat preservation performance of the battery 13, slowing down the heat loss of the battery 13 in low-temperature environments and making the battery 13 less susceptible to low-temperature effects during charging and discharging in low-temperature environments.

[0028] Example 2: Please refer to Figure 4 、 Figure 5 、 Figure 7 The present invention provides a technical solution: a lithium battery charging and discharging insulation device in a low-temperature environment. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. The insulation mechanism 2 also includes a leakage protection unit 22. The leakage protection unit 22 is arranged inside the battery box 11. The leakage protection unit 22 is used to increase the heat storage and insulation safety of the heat storage and insulation unit 21.

[0029] As a further limitation of the heat preservation 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, the upper surface of the temporary storage box 2201 is fixedly connected to the third solenoid valve 2202, the other end of the third solenoid valve 2202 is fixedly connected to the outer surface of the connecting pipe 2107, the outer surface of the connecting pipe 2107 is fixedly connected to the fourth solenoid valve 2203, the fourth solenoid valve 2203 is arranged above the third solenoid valve 2202, and the outer surface of the return pipe 2109 is fixed. The fifth solenoid valve 2204 is connected, and the other end of the fifth solenoid valve 2204 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 insulation frame 2102 is provided with a plurality of 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 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, the sixth solenoid valve 2206 and the seventh solenoid valve 2210 are all electrically connected to the electronic pressure gauge 2207 through wires. The other end of the seventh solenoid valve 2210 is fixedly connected to the drainage pipe 2209. The other end of the drainage pipe 2209 passes through the battery box 11 and the insulation frame 2102 in sequence and is fixedly connected to the guide groove 2208. The return pipe 2109 The other end of the heat-insulating frame 2102 is fixedly connected to the outer surface of the drainage pipe 2209. By providing the leakage protection unit 22, the thermal oil used for heating and heat preservation can be prevented from leaking and corroding the battery 13. Even if the thermal oil leaks due to collision or knock during the heating and heat preservation process, the thermal oil will not be directly soaked outside the battery 13, thereby preventing excessive thermal oil from penetrating into 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. 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. The pressure relief valve 2211 can discharge excess pressure inside the temporary storage box 2201 to the outside, preventing the temporary storage box 2201 from being damaged due to excessive internal pressure. The drain valve 2212 can facilitate the staff to discharge the hydraulic oil inside the temporary storage box 2201 to the outside, ensuring the convenience of discharging the oil inside the temporary storage box 2201.

[0030] 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 the external controller. At this time, the pressure value inside the insulation coil 2108 and the delivery pipe 2120 can be 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, the pressure will gradually increase, and when the temperature decreases, the pressure will gradually decrease, and the change in the pressure value is relatively large. The pressure value rises or falls gradually. When the pressure value drops suddenly, it proves that the insulation coil 2108, the connecting pipe 2107 or the delivery pipe 2120 is damaged due to external collision and bumping, 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 2115 to actively close, the third solenoid valve 2202, the fifth solenoid valve 2204 and the seventh solenoid valve 2210 to open, and the fourth solenoid valve 2203 and the sixth solenoid valve 2206 to close, and the delivery pump 2106 starts to work. The heat transfer oil in the heat preservation coil 2108 and the delivery pipe 2120 is quickly drawn out through the suction pipe 2205, the fifth solenoid valve 2204 and the return pipe 2109, and the heat transfer oil is sent to the temporary storage box 2201 for collection through the closed fourth solenoid valve 2203 and the opened third solenoid valve 2202, instead of being sent back to the storage box 2121 for continued circulation. The heat transfer oil leaked from the heat preservation coil 2108 and the delivery pipe 2120 will also flow into the guide groove 2208 on the insulation frame 2102, and then through the heat transfer oil in the temporary storage box 2201 for collection. Through the drainage 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, thereby preventing the thermal oil used for heating and insulation from leaking and corroding the battery 13. Even if the thermal oil leaks due to collision or bumping during the heating and insulation process of the battery 13, the thermal oil will not be directly soaked in the outside of the battery 13, thereby preventing excessive penetration of the thermal oil into the battery 13 and causing short circuit damage to the battery 13, thereby increasing the heating and insulation safety and reliability of the battery 13.

[0031] Example 3: Please refer to Figure 2 、 Figure 3 Figure 5 、 Figure 7-10 The present invention provides a technical solution: a lithium battery charging and discharging insulation device in a low-temperature environment. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. 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 is used in conjunction with the insulation mechanism 2. The high-temperature protection mechanism 3 is used to balance the high temperature of the battery 13.

[0032] As a further limitation 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 arranged 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, and the drain valve 2212 passes through the left side of the protective cover 301. On the side, a plurality of 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 with heat-conducting copper sheets 303 arranged at equal distances. The left side of each heat-conducting copper sheet 303 is fixedly connected to the right side of the protective cover 301. 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 fixedly connected to the outer surface of the connecting pipe 2107. 04 is arranged 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, and 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 the limit frame 306, the inner wall of the limit frame 306 is fixedly connected to a plurality of fixed cylinders 307, and the inner walls of the plurality of fixed cylinders 307 are fixedly connected to the heat dissipation fans 308. By providing the high-temperature protection mechanism 3, it can cooperate with the heat storage and heat preservation unit 21 to charge and discharge the battery 13 in a low-temperature environment while further balancing 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, the battery 13 can be cooled in time so that the battery 13 can always be maintained in a very suitable working temperature range, further ensuring the charging, discharging and heat preservation effect of the battery 13; The inner walls of several fixed cylinders 307 are fixedly connected with baffles 310, and each baffle 310 is arranged on the left side of the heat dissipation fan 308. The left side of each baffle 310 is provided with air holes 311 arranged at equal distances. The baffles 310 cooperate with the air holes 311 to ensure that the outside world can enter the fixed cylinder 307 smoothly, while preventing larger impurities from the outside from being sucked into the fixed cylinder 307, thereby ensuring the safe operation of the heat dissipation fan 308.

[0033] 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, and the fifth solenoid valve 2204 and the eighth solenoid valve 304 to open, and at the same time the cooling fan 308 starts to work, thereby the insulation coil 2108 The heat transfer oil in the delivery pipe 2120 and the return pipe 2109 no longer flows into the storage tank 2121 for heating circulation, but is sent into the heat dissipation coil 302 by the delivery pump 2106 through the eighth solenoid valve 304. At this time, the wind force provided by the cooling fan 308 cooperates with the fixed cylinder 307 and the limit frame 306 to draw the outside air into the protective cover 301, and makes the air blow through the heat dissipation coil 302 and the heat-conducting copper sheet 303 and then be discharged from the exhaust slot 309. 2, and then when the heat transfer oil inside the heat dissipation coil 302 finally flows into the insulation coil 2108 through the delivery pipe 2120 again through the one-way valve 305 for circulation, the temperature around the battery 13 can be effectively reduced, so that the battery 13 can be charged and discharged in a low-temperature environment and kept warm. At the same time, the working temperature of the battery 13 can be further balanced, so that when the working temperature of the battery 13 is high and affects the safety of the battery 13, the battery 13 can be cooled in time to ensure that the battery 13 can always be maintained in a very suitable working temperature range, further ensuring the charging and discharging insulation effect of the battery 13, and the cooling heat transfer oil circulation circuit of the battery 13 is different from the heating and insulation heat transfer oil circulation circuit, and thus will not affect the heat storage work of the heat storage salt inside the storage box 2121. When the cooling and insulation 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 to prepare for the subsequent insulation work of the battery 13.

[0034] A method for using a lithium battery low temperature environment charging and discharging heat preservation device, specifically comprising the following steps S1: First, connect the heating wire 2104, the delivery pump 2106, the temperature sensor 2111, the first solenoid valve 2114, the second solenoid valve 2115, 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, the seventh solenoid valve 2210, the eighth solenoid valve 304 and the cooling fan 308 to the external controller. When the battery 13 is charged in a low temperature environment through the power socket 2116, the temperature inside the battery box 11 can be detected by the temperature sensor 2111. When the temperature inside the battery box 11 is low, the battery 13 is charged. The heating wire 2104 and the delivery pump 2106 can also be connected to an external power source via the electrical socket 2116. The heating wire 2104 generates heat, and the delivery pump 2106 then pumps the thermal oil from the oil storage tank 2103 outwards through the heat-conducting coil 2105. As the thermal oil passes through the heat-conducting coil 2105, the heat provided by the heating wire 2104 heats the thermal oil. Furthermore, when the thermal oil passes through the delivery pump 2106, the connecting pipe 2107, and the delivery pipe 2120 and enters the interior of the heat-insulating coil 2108, heat conduction can be used to quickly increase the temperature around the battery 13, bringing it to 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, and the heat insulation frame 2102 is used to prevent heat from continuing to be directed to the battery 13 through the insulation box 2101. At this time, the heating wire 2104 continues to heat, heating the heat storage salt pre-filled in the storage box 2121 to a melted or semi-melted state, thereby utilizing the solid-liquid conversion of the heat storage salt to store a large amount of heat. At the same time, the insulation box 2101, the storage box 2121, the first solenoid valve 2114 and the second solenoid valve 2115 can form a relatively closed heat storage space, reducing the speed of heat loss to the outside, and then when the battery 13 is fully charged, the storage box 2121 is closed. 1 also stores a large amount of heat. When the battery 13 is subsequently discharged for a long period of time, if the low temperature environment again causes the battery 13 to be too low in temperature and affects the discharge effect, the battery 13 only needs to provide a relatively small amount of electricity to drive the delivery pump 2106 compared to continuous heating. The heat released by the heat storage salt in the storage tank 2121 during the solidification process of the liquid into a solid is transported to the outside of the battery 13 through the connecting pipe 2107, the delivery pipe 2120 and the insulation coil 2108 for insulation. Finally, the heat transfer oil flows back to the oil storage tank 2103 through the return pipe 2109 for recycling. In this way, when the battery 13 is charged in a low temperature environment, it can not only maintain the charging temperature but also store a large amount of heat. S3: The solid-liquid conversion of the heat storage salt is used to release heat to the outside for a long time, so that the battery 13 can maintain the temperature of the battery 13 when discharging without consuming too much of the battery 13's own electrical energy during the subsequent discharge process for a long period of time, thereby improving the charging and discharging efficiency of the battery 13 in a low temperature environment and ensuring the use effect of the battery 13 in a warm environment. Even after the heat storage salt is completely cooled, the battery 13 only needs to use electricity to cooperate with the heating wire 2104 to heat the heat storage salt again, and can store a large amount of heat again to achieve discharge and heat preservation work in a low temperature environment. There is no need to continuously provide electricity for high-energy electric heating and heat preservation, thereby effectively ensuring the overall endurance of the battery 13 in a low temperature environment. In addition, the battery box 11 can be combined with the insulation shell 2112 and the insulation plate 2113 to further increase the thermal insulation performance of the battery 13, so that the heat loss rate of the battery 13 in a low temperature environment is slower, making the battery 13 less susceptible to low temperature effects when charging and discharging in a low temperature environment. S4: The pressure value inside the insulation coil 2108 and the delivery pipe 2120 can be 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, the pressure will gradually increase, and when the temperature decreases, the pressure will gradually decrease, and the change in the pressure value will be a relatively slow rise or fall. When the pressure value drops suddenly, it proves that the insulation coil 2108, the connecting pipe 2107 or the delivery pipe 2120 is damaged due to external collisions and bumps, 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 2114. Valve 2115 is actively closed, the third solenoid valve 2202, the fifth solenoid valve 2204 and the seventh solenoid valve 2210 are opened, and at the same time the fourth solenoid valve 2203 and the sixth solenoid valve 2206 are closed, and the delivery pump 2106 starts working, rapidly pumping out the heat transfer oil in the insulation coil 2108 and the delivery pipe 2120 through the suction pipe 2205, the fifth solenoid valve 2204 and the return pipe 2109. The heat transfer oil is then sent to the temporary storage tank 2201 for collection through the closed fourth solenoid valve 2203 and the opened third solenoid valve 2202, instead of being sent back to the storage tank 2121 for further circulation. S5: 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 insulation frame 2102, and then through the drainage pipe 2209 connected to the guide groove 2208, it can also be sucked by the delivery pump 2106 and delivered to the temporary storage box 2201, thereby preventing the heat transfer oil used for heating and heat preservation from leaking and causing corrosion to the battery 13. Even if the heat transfer oil leaks due to collision or bumping during the heating and heat preservation process, the heat transfer oil will not be directly soaked outside the battery 13, thereby preventing excessive heat transfer oil from penetrating into 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. 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, and the fifth solenoid valve 2204 and the eighth solenoid valve 304 to open, and the cooling fan 308 starts to work, so that the insulation coil 2108 and the delivery pipe 212 0 and the heat transfer oil in the return pipe 2109 no longer flows into the storage tank 2121 for heating circulation, but is sent into the heat dissipation coil 302 by the delivery pump 2106 through the eighth solenoid valve 304. At this time, the wind force provided by the heat dissipation fan 308 cooperates with the fixed cylinder 307 and the limit frame 306 to draw the outside air into the protective cover 301, and makes the air blow through the heat dissipation coil 302 and the heat-conducting copper sheet 303 and then be discharged from the exhaust groove 309. The temperature is lowered, and when the heat transfer oil inside the heat dissipation coil 302 finally flows into the insulation coil 2108 through the delivery pipe 2120 again through the one-way valve 305 for circulation, the temperature around the battery 13 can be effectively lowered, so that the battery 13 can be charged and discharged in a low-temperature environment and kept warm. At the same time, the working temperature of the battery 13 can be further balanced. When the working temperature of the battery 13 is high and affects the safety of the battery 13, the battery 13 can be cooled in time to ensure that the battery 13 can always be maintained in a very suitable working temperature range, further ensuring the charging and discharging insulation effect of the battery 13, and the cooling heat transfer oil circulation loop of the battery 13 is different from the heating and insulation heat transfer oil circulation loop, and thus will not affect the heat storage work of the heat storage salt inside the storage box 2121. When the cooling and insulation 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 to prepare for the subsequent insulation work of the battery 13.

[0035] 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A lithium battery charging and discharging heat preservation device in a low temperature environment, characterized by: The battery mechanism (1) comprises a battery box (11), a cover plate (12) is provided above 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); The heat preservation mechanism (2) includes a heat storage and heat preservation unit (21), which is arranged 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; The heat preservation mechanism (2) further comprises a leakage protection unit (22), the leakage protection unit (22) being arranged inside the battery box (11), and the leakage protection unit (22) being 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 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).

2. A lithium battery low temperature environment charge and discharge heat preservation device according to claim 1, characterized in that: The heat storage and heat preservation unit (21) comprises 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), the upper surface of the heat preservation box (2101) is fixedly connected to a heat insulation frame (2102), the bottom surfaces of a plurality of the storage batteries (13) are fixedly connected to the upper surface of the heat insulation frame (2102), the inner wall of the heat preservation box (2101) is fixedly connected to a storage box (2121), the inner side wall of the storage box (2121) is fixedly connected to an oil storage tank (2103), the inner bottom wall of the storage box (2121) is fixedly connected to a heating wire (2104), the inner wall of the storage box (2121) is provided with a heat conducting coil (2105), and the heat conducting coil (2105) ) input end passes through the interior of the oil storage tank (2103), a delivery pump (2106) is provided on the left side of the insulation box (2101), and 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), the inner wall of the battery box (11) is fixedly connected to the insulation shell (2112), the bottom surface of the insulation shell (2112) is fixedly connected to the upper surface of the insulation frame (2102), the inner wall of the insulation shell (2112) is fixedly connected to the outer surface of the limit plate (2110), and the insulation shell (2112) is fixedly connected to the outer surface of the limit plate (2110). ) is provided above the heat preservation plate (2113), the upper surface of the heat preservation 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), the outer surfaces of the plurality of batteries (13) are sleeved with heat preservation coils (2108), the input ends of the plurality of heat preservation coils (2108) are fixedly connected to the delivery pipe (2120), the other end of the delivery pipe (2120) passes through the heat preservation shell (2112) and the battery box (11) in sequence and is fixedly connected to the connecting pipe (2107), the output ends of the plurality of heat preservation coils (2108) are fixedly connected to the return pipe (2109), one end of the return pipe (2109) is fixedly connected to the return pipe (2109). The heat-insulating frame (2102), the heat-insulating box (2101) and the storage box (2121) are penetrated and extended to the interior of the oil storage tank (2103). The outer surfaces of the plurality of batteries (13) are commonly clamped with a limit plate (2110). The bottom surface of the limit plate (2110) is fixedly connected with four temperature sensors (2111). Each temperature sensor (2111) is electrically connected to the delivery pump (2106) through a wire. The outer surface of the output end of the heat-conducting coil (2105) is fixedly connected with 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 with 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), and the first solenoid valve (2114) and the second solenoid valve (2115) are both electrically connected to the temperature sensor (2111) via wires.

3. The lithium battery low temperature environment charge and discharge insulation device according to claim 2, characterized in that: The front of the battery box (11) is fixedly mounted with a power receiving seat (2116), the back of the power receiving seat (2116) passes through the battery box (11) and the insulation shell (2112) in sequence and extends to the bottom of the insulation plate (2113), the heating wire (2104) is electrically connected to the power receiving seat (2116) via a wire, and the front and back of the battery box (11) are fixedly connected to two mounting supports (2117).

4. The lithium battery low temperature environment charge and discharge heat preservation device according to claim 2, characterized in that: The cover plate (12) is internally threadedly connected to a plurality of mounting bolts (2118), 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).

5. The lithium battery low temperature environment charge and discharge 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 plurality of stabilizing frames (2119), and the upper surface and the bottom surface of each stabilizing frame (2119) are fixedly connected to the inner top wall and the inner bottom wall of the storage box (2121).

6. The lithium battery low temperature environment charge and discharge heat preservation device according to claim 2, characterized in that: The leakage protection unit (22) comprises 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), the upper surface of the temporary storage box (2201) is fixedly connected to a third solenoid valve (2202), the other end of the third solenoid valve (2202) is fixedly connected to the outer surface of the connecting pipe (2107), the outer surface of the connecting pipe (2107) is fixedly connected to a fourth solenoid valve (2203), and the fourth solenoid valve (2203) is fixedly connected to the outer surface of the connecting pipe (2107). The outer surface of the return pipe (2109) is fixedly connected to the fifth solenoid valve (2204), and the other end of the fifth solenoid valve (2204) 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 an electronic pressure gauge (2207), the upper surface of the heat insulation frame (2102) is provided with a plurality of guide grooves (2208), the outer surface of the input end of the delivery pump (2106) is fixedly connected to a seventh solenoid valve (2210), 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), the sixth solenoid valve (2205) and the sixth solenoid valve (2206) are fixedly connected to each other. The valve (2206) and the seventh solenoid valve (2210) are both electrically connected to the electronic pressure gauge (2207) through a wire. The other end of the seventh solenoid valve (2210) is fixedly connected to the drainage tube (2209). The other end of the drainage tube (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 drainage tube (2209).

7. The lithium battery low temperature environment charge and discharge heat preservation device according to claim 6, 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 liquid discharge valve (2212).

8. The lithium battery low temperature environment charge and discharge heat preservation device according to claim 7, 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 arranged 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) passes through the left side of the protective cover (301), and the left side of the protective cover (301) is provided with a plurality of exhaust slots (309). A heat dissipation coil (302) is provided inside the protective cover (301), and the outer surface of the heat dissipation coil (302) is fixedly connected to heat-conducting copper sheets (303) arranged at equal distances, and the left side of each heat-conducting copper sheet (303) is fixedly connected to the protective cover (3 01), 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 arranged 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 delivery pipe (2120), the inner wall of the protective cover (301) is fixedly connected to the limiting frame (306), the inner wall of the limiting frame (306) is fixedly connected to a plurality of fixed cylinders (307), and the inner walls of the plurality of fixed cylinders (307) are fixedly connected to a heat dissipation fan (308).

9. The lithium battery low temperature environment charge and discharge heat preservation device according to claim 8, characterized in that: The inner walls of the plurality of fixed cylinders (307) are fixedly connected with baffles (310), each of the baffles (310) is arranged on the left side of the heat dissipation fan (308), and the left side of each baffle (310) is provided with air holes (311) arranged at equal distances.

10. A method for using the lithium battery low-temperature environment charge and discharge heat preservation device according to any one of claims 1 to 9, characterized in that: Specifically include the following steps: S1: First, the heating wire (2104), the delivery pump (2106), the temperature sensor (2111), the first solenoid valve (2114), the second solenoid valve (2115), 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), the seventh solenoid valve (2210), the eighth solenoid valve (304) and the cooling fan (308) are connected to the external controller. When the battery (13) is charged in a low temperature environment through the power socket (2116), the temperature inside the battery box (11) can be detected by the temperature sensor (2111). When the temperature inside the battery box (11) is relatively low, the temperature inside the battery box (11) is detected. When the temperature is low, the heating wire (2104) and the delivery pump (2106) can also be connected to an external power supply through the electric socket (2116), and the heating wire (2104) can be used to generate heat. Then, the delivery pump (2106) is used to draw the heat-conducting oil inside the oil storage tank (2103) outward through the heat-conducting coil (2105). When the heat-conducting oil passes through the heat-conducting coil (2105), the heat provided by the heating wire (2104) will heat the heat-conducting oil. Then, when the heat-conducting oil passes through the delivery pump (2106) and the connecting pipe (2107), and the delivery pipe (2120) and enters the interior of the insulation coil (2108), the temperature around the battery (13) can be quickly 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, and the heat insulation frame (2102) is used to prevent the heat from continuing to be directed to the battery (13) through the heat preservation box (2101). At this time, the electric heating wire (2104) continues to heat, heating the heat storage salt pre-filled in the storage box (2121) to a melted or semi-melted state, thereby utilizing the solid-liquid conversion of the heat storage salt to store a large amount of heat. At the same time, the heat preservation 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, thereby reducing the speed of heat loss to the outside. When the battery (13) is fully charged, the storage box (2121) is closed. 121) also stores a large amount of heat inside, so that when the battery (13) is discharged for a long period of time, if the low temperature environment again causes the temperature of the battery (13) to be too low and affects the discharge effect, the battery (13) only needs to provide less electricity than continuous heating to drive the delivery pump (2106), so that the heat released outward by the heat storage salt inside the storage tank (2121) during the process of solidification of the liquid into a solid is transported to the outside of the battery (13) through the connecting pipe (2107), the delivery pipe (2120) and the insulation coil (2108) for insulation. Finally, the heat transfer oil flows back to the oil storage tank (2103) through the return pipe (2109) for recycling. Therefore, when the battery (13) is charged in a low temperature environment, it can not only ensure the charging temperature but also store a large amount of heat. S3: Utilize the solid-liquid conversion of the heat storage salt to release heat to the outside for a long time, so that the battery (13) can maintain the temperature of the battery (13) during discharge without consuming too much of the battery (13)'s own electric energy during the subsequent long period of discharge, thereby improving the charging and discharging efficiency of the battery (13) in a low-temperature environment and ensuring the use effect of the battery (13) in a warm environment. Even after the heat storage salt is completely cooled, the battery (13) only needs to heat the heat storage salt again through electric energy in conjunction with the heating wire (2104), that is, A large amount of heat can be stored again to achieve discharge and heat preservation work in a low-temperature environment, without the need to continuously provide electric energy for electric heating and heat preservation with high energy consumption, thereby effectively ensuring the overall endurance of the battery (13) in a low-temperature environment, and the battery box (11) can be combined with the heat preservation shell (2112) and the heat preservation plate (2113) to further increase the heat preservation performance of the battery (13), so that the heat loss rate of the battery (13) in a low-temperature environment is slower, making the battery (13) less susceptible to the influence of low temperature when charging and discharging in a low-temperature environment; S4: The pressure value inside the heat preservation coil (2108) and the delivery pipe (2120) can be monitored by the electronic pressure gauge (2207). When the temperature of the heat transfer oil inside the heat preservation coil (2108) and the delivery pipe (2120) increases, the pressure will gradually increase, and when the temperature decreases, the pressure will gradually decrease, and the change in the pressure value will be a relatively slow rise or fall. When the pressure value drops suddenly, it proves that the heat preservation coil (2108), the connecting pipe (2107) or the delivery pipe (2120) is damaged due to external collision and bump, 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 (2115) ) is actively closed, the third solenoid valve (2202), the fifth solenoid valve (2204) and the seventh solenoid valve (2210) are opened, and at the same time the fourth solenoid valve (2203) and the sixth solenoid valve (2206) are closed, and the delivery pump (2106) starts to work, and the heat transfer oil inside the insulation coil (2108) and the delivery pipe (2120) is quickly drawn out through the suction pipe (2205), the fifth solenoid valve (2204) and the return pipe (2109), and the heat transfer oil is sent to the interior of the temporary storage box (2201) for collection through the closed fourth solenoid valve (2203) in conjunction with the opened third solenoid valve (2202), instead of being sent back to the interior of the storage box (2121) to continue circulating; S5: The heat transfer oil leaked from the insulation coil (2108) and the delivery pipe (2120) will also flow into the guide groove (2208) on the insulation frame (2102), and then through the drainage 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 heat preservation from leaking and causing corrosion to the battery (13). Even if the heat transfer oil leaks due to collision or bumping during the heating and heat preservation process of the battery (13), the heat transfer oil will not be directly soaked outside the battery (13), thereby preventing the heat transfer oil from excessively penetrating into 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); 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 be closed, and the fifth solenoid valve (2204) and the eighth solenoid valve (304) to be opened, and the cooling fan (308) starts to work at the same time, thereby the heat preservation coil (2108), the conveyor The heat transfer oil in the pipe (2120) and the return pipe (2109) no longer flows into the storage box (2121) for heating circulation, but is sent into the heat dissipation coil (302) by the delivery pump (2106) through the eighth solenoid valve (304). At this time, the wind force provided by the heat dissipation fan (308) cooperates with the fixed cylinder (307) and the limit frame (306) to draw the outside air into the protective cover (301), and blows the air through the heat dissipation coil (302) and the heat-conducting copper sheet (303) and then is discharged from the exhaust groove (309), so that the heat transfer oil flows through the heat dissipation coil. (302) can be lowered in temperature, and then when the heat transfer oil inside the heat dissipation coil (302) finally flows through the one-way valve (305) and again through the delivery pipe (2120) into the heat preservation coil (2108) for circulation, the temperature around the battery (13) can be effectively lowered, so that the battery (13) can be charged and discharged in a low-temperature environment and kept warm, and the working temperature of the battery (13) can be further balanced, so that when the working temperature of the battery (13) is high and affects the safety of the battery (13), the battery (13) can be cooled in time. It is ensured that the battery (13) can always be maintained in a very suitable operating temperature range, further ensuring the charging and discharging insulation effect of the battery (13), and the cooling heat transfer oil circulation circuit of the battery (13) is different from the heating and insulation heat transfer oil circulation circuit, thereby not affecting the heat storage work of the heat storage salt inside the storage box (2121). When the cooling and insulation 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 to prepare for the subsequent insulation work of the battery (13).

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