Preheating device and preheating method for ultralow-temperature starting power supply

Abstract

The invention discloses a preheating device and a preheating method for an ultralow-temperature starting power supply, and relates to the field of ultralow-temperature starting power supplies, the preheating device comprises a shell and a battery cell group, the shell is internally provided with a battery cell bin and a control bin, the control bin is internally provided with an MCU module and a bidirectional air pump, and the battery cell group is composed of a plurality of battery cells arranged at intervals; the battery cell group is positioned in the battery cell bin through the upper and lower layers of retainers, a closed net-shaped chamber is formed among the battery cell group, the upper and lower retainers and the battery cell bin, an air bag is arranged in the net-shaped chamber, and flexible heating sheets are symmetrically arranged on the two sides of the air bag. The two-way air pump drives air to be circularly conducted between the net-shaped cavity and the air bag, the air bag expands to enable the flexible heating piece to be flatly attached to the battery cells for direct heating, meanwhile, the flexible heating piece heats the circulating air in the air bag, hot air is rapidly filled and diffused in the net-shaped cavity, and all the battery cells are rapidly and evenly preheated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ultra-low temperature starting power supply, in particular to a preheating device and method for ultra-low temperature starting power supply. BACKGROUND

[0002] The ultra-low temperature starting power supply is widely used in the fields of automobile rescue, outdoor operation, national defense and military, power communication, etc., and its core function is to provide instant large current for fuel vehicles, new energy vehicles, diesel generators or other large equipment to complete starting under extremely low temperature conditions.

[0003] At present, the ultra-low starting power supply on the market mostly adopts the technical route of lithium battery cells (such as lithium iron phosphate), super capacitors or a mixture of the two. The lithium battery cells of the starting power supply have good low-temperature working ability, but the ultra-low temperature environment will still reduce the chemical activity of the starting power supply. Therefore, preheating treatment needs to be applied to the starting power supply to improve its chemical activity, so that the starting power supply can be quickly activated.

[0004] At present, the cell preheating of the low-temperature starting power supply is realized by integrating heating fins. Only the heating fins are attached to the cells for heating. This way, the heat exchange area is small, the heat diffusion is slow, and the heating temperature is uneven. The preheating effect needs to be improved. SUMMARY

[0005] In order to make up for the shortcomings of the prior art, the purpose of the present application is to provide a preheating device and method for ultra-low temperature starting power supply, which solves the problem that the cell preheating of the low-temperature starting power supply is realized by attaching heating fins, the heat exchange area is small, the heat diffusion is slow, and the heating temperature is uneven.

[0006] In order to solve the problems of the prior art, the technical scheme of the present application is as follows: A preheating device for ultra-low temperature starting power supply, comprising a shell and a cell group, the shell has a cell compartment and a control compartment inside, an MCU module and a bidirectional air pump are arranged in the control compartment, the cell group is composed of a plurality of cells arranged in gaps, the cell group is positioned in the cell compartment through upper and lower retaining frames, a closed mesh chamber is formed between the cell group, the upper and lower retaining frames and the cell compartment, an air bag is arranged in the mesh chamber, flexible heating fins are symmetrically arranged on both sides of the air bag, the air inlet end of the bidirectional air pump is connected to the mesh chamber through a return pipe, one end of the air bag is connected to the air outlet end of the bidirectional air pump through a gas injection pipe, the other end of the air bag is provided with a gas overflow valve, the gas overflow valve is connected to the mesh chamber, the bidirectional air pump supplies air to the air bag, the air bag expands to make the flexible heating fins flatly adhere to the cells on both sides, and the excess gas in the air bag is introduced into the mesh chamber through the gas overflow valve, the bidirectional air pump, the flexible heating fins, the cell group and the MCU module are electrically connected.

[0007] Preferably, the outer contour of the retainer is adapted to the cell compartment, the surface of the retainer has a plurality of slots corresponding to the cells, and sealing strips are provided on the outer periphery of the retainer and the inner wall of the slots, so that the retainer and the cell compartment are sealed and adapted, and the cells are sealed and inserted into the slots.

[0008] Preferably, one or more of the cells in the cell group are auxiliary cells, and the remaining cells are main cells. The auxiliary cells are electrically connected to the main cells through an MCU module, and the bidirectional air pump and flexible heating element are electrically connected to the auxiliary cells through an MCU module.

[0009] Preferably, the upper and lower parts of the airbag are respectively connected to the retainer, and the overflow valves and air injection pipes on both sides of the airbag are respectively connected to the corresponding sides of the battery cell compartment, so that the airbag is tightened around when it is deflated.

[0010] Preferably, the overflow valve includes a valve tube, the inner end of which is connected to an air bladder, a stopper screwed into the inner thread of the outer port of the valve tube, a valve core adapted to slide inside the valve tube, a compression spring provided between the stopper and the valve core, the compression spring pushing the valve core to block the inner end of the valve tube, and a valve hole penetrating a mesh chamber is opened on the surface of the valve tube.

[0011] Preferably, the valve pipe, the air injection pipe, and the air return pipe all penetrate the side wall of the battery cell compartment, and two sets of nuts are threaded to the outer sides of the valve pipe, the air injection pipe, and the air return pipe, respectively abutting against the inner and outer walls of the battery cell compartment.

[0012] Preferably, a reversing valve is provided in the control chamber, and the air inlet and exhaust ends of the bidirectional air pump are respectively connected to the air return pipe and the air injection pipe through the reversing valve. An air inflation pipe is connected to the surface of the housing, and the air inflation pipe is connected to the exhaust end of the bidirectional air pump through the reversing valve.

[0013] Preferably, the reversing valve includes a valve body with a return air chamber and an injection air chamber. The return air chamber is connected to the inlet of the bidirectional air pump through a main return air port. The return air chamber has an inner return air port and an outer return air port. The axial position of the main return air port corresponds to the inner return air port and the outer return air port. The inner return air port and the outer return air port are respectively connected to the return air pipe fitting and the external environment. The injection air chamber is connected to the exhaust end of the bidirectional air pump through a main injection air port. The axial position of the main injection air port corresponds to the inner injection air port and the outer injection air port. The inner injection air port and the outer injection air port are respectively connected to the injection pipe fitting and the inflation pipe. A valve plate is adapted to slide in both the return air chamber and the injection air chamber. A valve rod is axially slidably inserted at one end of the valve body. The valve rod drives the two valve plates to move axially synchronously, so that one of the inner return air port and the outer return air port is connected to the main return air port, and one of the inner injection air port and the outer injection air port is connected to the main injection air port.

[0014] Preferably, the valve stem is connected to an adjusting assembly at its end. The adjusting assembly includes a connecting handle. A groove is formed on the surface of the housing. The connecting handle slides along the groove. The valve stem is fixedly connected to the inner end of the connecting handle. A lever is inserted through the groove at the outer end of the connecting handle. Two arc-shaped grooves are formed on the outer sides of both ends of the groove. The lever has an arc-shaped convex surface that fits the arc-shaped groove. A tension spring is connected between the lever and the connecting handle. The tension spring applies a pulling force to the lever so that the arc-shaped convex surface is engaged in the arc-shaped groove.

[0015] A preheating method for a preheating device based on the aforementioned cryogenic start-up power supply includes the following steps: A. The MCU module controls the bidirectional air pump and flexible heating element to work synchronously. The bidirectional air pump injects air into the airbag through the air injection tube. The airbag expands and the flexible heating elements on both sides are flat against the battery cells on both sides. The flexible heating elements heat the battery cells in contact with the airbag and heat the gas inside the airbag at the same time. B. Continuously inflate the airbag. The excess gas in the airbag is introduced into the mesh chamber through the overflow valve to heat each cell evenly. The bidirectional air pump draws out the gas in the mesh chamber through the return air pipe, so that the bidirectional air pump drives the gas to circulate between the airbag and the mesh chamber. C. After the battery cell assembly is heated to the set temperature, the MCU module controls the flexible heating element to stop working and controls the bidirectional air pump to work in reverse. The bidirectional air pump draws gas from the airbag to make it contract, thus separating the flexible heating element from the battery cell.

[0016] Compared with the prior art, the advantages of the present invention are as follows: 1. This invention arranges several battery cells with gaps between them in the battery cell compartment to form a mesh chamber. A bidirectional air pump drives gas to circulate and conduct between the mesh chamber and the air bag. As the air bag expands, the flexible heating element is placed flat against the battery cell to directly heat it. At the same time, the flexible heating element heats the circulating gas in the air bag, so that the hot gas quickly fills and diffuses in the mesh chamber, achieving rapid and uniform preheating of all battery cells. The power supply can be quickly activated and applied.

[0017] 2. This invention uses an airbag to inflate the flexible heating element, which then adheres to the battery cell for heating. After preheating, the airbag is deflated to allow it to contract, enabling the flexible heating element to quickly separate from the battery cell and preventing damage to the battery cell from the residual heat of the flexible heating element.

[0018] 3. The present invention is equipped with an inflation tube for inflating tires. The inflation mode and the circulating preheating mode share a bidirectional air pump. The air path of the bidirectional air pump can be adjusted by a reversing valve to easily switch between the inflation mode and the circulating preheating mode. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the interior of the control chamber of the present invention.

[0021] Figure 3 This is a schematic diagram of the distribution structure of the airbag, battery cell and cage of the present invention.

[0022] Figure 4 This is a top view schematic diagram of the airbag distribution of the present invention.

[0023] Figure 5 This is a schematic side cross-sectional view of the airbag of the present invention.

[0024] Figure 6 This is a schematic diagram of the reversing valve structure of the present invention.

[0025] Figure 7 This is a schematic diagram of the overflow valve structure of the present invention.

[0026] Figure 8 This is a schematic diagram of the positioning component structure of the present invention.

[0027] Figure 9 This is a schematic diagram of the connection structure between the connecting handle and the lever handle of the present invention.

[0028] Reference numerals: 1. Housing; 11. MCU module; 2. Battery cell assembly; 21. Cage; 211. Slot; 3. Two-way air pump; 4. Reversing valve; 41. Return air chamber; 42. Injection air chamber; 43. Main return air port; 44. Main injection air port; 45. Inner return air port; 46. Outer return air port; 47. Inner injection air port; 48. Outer injection air port; 49. Valve plate; 410. Valve stem; 411. Valve body; 5. Adjustment assembly; 51. Connecting handle; 52. Toggle handle; 53. Slide groove; 54. Arc-shaped groove; 55. Arc-shaped convex surface; 6. Inflation tube; 7. Airbag; 71. Injection fitting; 72. Return air fitting; 8. Overflow valve; 81. Valve tube; 82. Valve core; 83. Nut; 84. Valve hole; 85. Plug; 9. Flexible heating element. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] A preheating device for an ultra-low temperature start-up power supply, such as Figure 1 As shown, it includes a housing 1 and a battery cell assembly 2. The housing 1 has a battery cell compartment and a control compartment inside, and the housing 1 is equipped with a cover plate to seal the battery cell compartment and the control compartment. The outer side of the control compartment is equipped with a display module, control buttons, connection lines and other existing supporting components for starting the power supply, which will not be described in detail here.

[0031] like Figures 2-5As shown, the battery cell assembly 2 is composed of several battery cells arranged with gaps. It is provided with upper and lower retainers 21. The outer contour of the retainer 21 is adapted to the battery cell compartment. The surface of the retainer 21 has several slots 211 corresponding to the battery cells. The battery cells are inserted into the corresponding slots 211, and then the retainer 21 is placed in the battery cell compartment, so that the battery cells are assembled in the battery cell compartment in a fixed gap distribution state. The outer periphery of the retainer 21 and the inner wall of the slots 211 are provided with sealing strips to make the retainer 21 and the battery cell compartment sealed and adapted, and the battery cells and slots 211 sealed and inserted. Thus, the battery cell assembly 2, the upper and lower retainers 21 and the battery cell compartment form a sealed mesh chamber. The MCU module 11 is installed in the control compartment. The circuit of the battery cell assembly 2 passes through the control compartment and connects to the MCU module 11.

[0032] like Figures 3-5 As shown, the gap at the center of the battery cell assembly 2 has the largest width. An airbag 7 is set in this gap. The airbag 7 is made of flexible silicone material, which gives it good thermal conductivity. Flexible heating elements 9 are symmetrically arranged on both sides of the airbag 7. The flexible heating elements 9 are made of silicone rubber as the base and PTC ceramic particles composite material, which gives the flexible heating elements 9 a flexible deformation effect. The flexible heating elements 9 are connected to the outer wall of the airbag 7 by multi-point elastic bonding, which reduces the restriction of the flexible heating elements 9 on the expansion and deformation of the airbag 7.

[0033] like Figures 2-5 As shown, a bidirectional air pump 3 is installed in the control compartment. An air injection pipe 71 and an air return pipe 72 are installed through the partition between the battery cell compartment and the control compartment. The exhaust end and air inlet end of the bidirectional air pump 3 are connected to the air injection pipe 71 and the air return pipe 72, respectively. The air injection pipe 71 is connected to one end of the airbag 7, and the air return pipe 72 is connected to the mesh chamber. An overflow valve 8 is installed at the other end of the airbag 7 and is connected to the mesh chamber. Surface-mount temperature sensors are set on the surfaces of multiple battery cells in the battery cell group 2. The temperature sensors, the bidirectional air pump 3, and the battery cell group 2 are all controlled and connected by the MCU module 11.

[0034] The preheating method for ultra-low temperature start-up power supplies is as follows: The preheating temperature range T of the battery cell assembly 2 is set by the programming MCU module 11. The MCU module 11 controls the bidirectional air pump 3 and the flexible heating plate 9 to work synchronously. The bidirectional air pump 3 supplies air into the air bag 7 through the air injection pipe 71 to make it expand, so that the flexible heating plate 9 is attached to the battery cell surface on both sides. The flexible heating plate 9 heats the attached battery cell and the gas inside the flexible heating plate 9 synchronously. Air is continuously supplied to the airbag 7. When the air pressure in the airbag 7 exceeds the pressure range of the overflow valve 8, the hot air in the airbag 7 overflows into the mesh chamber through the overflow valve 8, thereby preheating each battery cell. The bidirectional air pump 3 draws the gas from the mesh chamber through the return air pipe 72 and reintroduces it into the airbag 7 for heating, so that the gas circulates between the airbag 7 and the mesh chamber to achieve the effect of circulating heating. The temperature of the battery cell is detected at multiple points by temperature sensors and fed back to the MCU module 11. When the temperature value fed back to the MCU module 11 by most temperature sensors exceeds the set T, the MCU module 11 controls the flexible heating element 9 to stop heating. At this time, the flexible heating element 9 has inertial heating. The MCU module 11 controls the bidirectional air pump 3 to run in reverse to extract the gas in the air bag 7 to make it contract, so as to ensure that the flexible heating elements 9 on both sides are separated from the battery cell in time and avoid the battery cell being overheated.

[0035] A pressure sensor is installed inside the airbag 7. The pressure sensor is connected to the MCU module 11. The pressure sensor detects the air pressure inside the airbag 7 and provides feedback on the working status of the airbag 7.

[0036] like Figure 5 As shown, the upper and lower parts of the airbag 7 are respectively connected to the retainer 21. The overflow valve 8 and the air injection pipe 71 on both sides of the airbag 7 are respectively connected to the corresponding sides of the battery cell compartment. When the airbag 7 is deflated, the surrounding area is tightened and contracted to the central plane shape to ensure that the flexible heating plate 9 on both sides is separated from the battery cell, and to make room for the battery cell to dissipate heat in the non-preheating state.

[0037] The working principle of relief valve 8 is as follows: like Figure 7 As shown, the overflow valve 8 includes a valve tube 81, with a flexible tube bonded to the inner end of the valve tube 81 and communicating with the airbag 7. A stopper 85 is screwed into the inner thread of the outer port of the valve tube 81. A sliding valve core 82 is adapted inside the valve tube 81. A compression spring is set between the stopper 85 and the valve core 82. The compression spring pushes the valve core 82 to block the inner end of the valve tube 81. A valve hole 84 is opened on the surface of the valve tube 81, and the valve hole 84 passes through the mesh chamber.

[0038] By compressing the spring, the valve core 82 blocks the airbag 7. When the airbag 7 is filled with gas, the gas supply continues. The continuously increasing gas pressure pushes the valve core 82 to overcome the elastic force and gradually move outward. When the gas pressure reaches a certain level, the valve core 82 retracts to expose the valve hole 84. The hot gas in the airbag 7 enters its interior through the inner port of the valve tube 81 and then enters the mesh chamber through the exposed valve hole 84. This keeps the airbag 7 in an inflated state while the interference gas continuously enters the mesh chamber.

[0039] like Figure 5As shown, valve pipe 81, air injection fitting 71, and air return fitting 72 all penetrate the side wall of the battery cell compartment. Two sets of nuts 83 are threaded to the outer sides of valve pipe 81, air injection fitting 71, and air return fitting 72. The two sets of nuts 83 abut against the inner and outer walls of the battery cell compartment, respectively, so that the overflow valve 8, air injection fitting 71, and air return fitting 72 can be fixedly installed. This is used to pull and shape the airbag 7 and also facilitates the connection and assembly of the air circuit.

[0040] The stopper 85 is screwed into the external port of the valve tube 81 by an internal thread. The outer surface of the stopper 85 has a hexagonal groove that is adapted to a wrench. By rotating the stopper 85, the axial position is adjusted to adjust the pressure of the compression spring on the valve core 82, thereby adjusting the overflow pressure of the valve core 8 to ensure that the air bag 7 has a suitable expansion state.

[0041] When the starting power supply is used as an energy storage power supply in a non-low temperature environment, the stopper 85, compression spring and valve core 82 can be removed from the valve tube 81, so that the valve tube 81 is open to the external environment. The MCU module 11 will only turn on the bidirectional air pump 3 to drive the air in the mesh chamber to be discharged from the valve tube 81, so as to achieve the effect of heat dissipation for the battery cell group 2.

[0042] In battery cell group 2, one or more of the cells are auxiliary cells, and the rest are main cells. The MCU module 11 integrates a module for detecting the power of the main cells and auxiliary cells, as well as a module for charging the main cells and auxiliary cells and preventing overcharge. The auxiliary cells are electrically connected to the main cells through the MCU module 11. When the power of the auxiliary cells is lower than the set value, the main cells charge the auxiliary cells. The bidirectional air pump 3, flexible heating element 9, temperature sensor, air pressure sensor, and external power supply components are all powered by the auxiliary cells through the MCU module 11. The main cells are mainly responsible for outputting a large current to start the equipment. The auxiliary cells share the frequent discharge work of the main cells, ensuring that the main cells have a stable output state and reducing the failure rate of the main cells. Secondly, the secondary battery cell undertakes frequent discharge operations, making it more likely to remain in an easily activated state, which facilitates rapid preheating of the main battery cell.

[0043] The cryogenic starting power supply is mainly used for emergency vehicle starting in low-temperature environments. Vehicle tires are prone to becoming deflated in low-temperature conditions, so the cryogenic starting power supply provided in this application is equipped with an inflation hose 6 to enhance its emergency inflation function. The inflation hose 6 shares a bidirectional air pump 3 with the preheating circulation function, and the specific connection method is as follows: like Figure 2 As shown, a reversing valve 4 is installed in the control compartment. The air inlet and exhaust ends of the bidirectional air pump 3 are connected to the return air pipe 72 and the air injection pipe 71 respectively through the reversing valve 4. The air filling pipe 6 is connected to the exhaust end of the bidirectional air pump 3 through the reversing valve 4.

[0044] like Figure 2, Figure 5 As shown, the reversing valve 4 includes a valve body 411, which has an axially isolated return air chamber 41 and an air injection chamber 42. One side of the return air chamber 41 has a main return air port 43, and the other side has an axially offset inner return air port 45 and an outer return air port 46. The axial position of the main return air port 43 corresponds to the inner return air port 45 and the outer return air port 46. The main return air port 43 is connected to the air inlet of the bidirectional air pump 3. The inner return air port 45 and the outer return air port 46 are respectively connected to the return air pipe 72 and the external environment. One side of the air injection chamber 42 has a main air injection port 44, and the other side of the air injection chamber 42 has an axially offset inner air injection port 47 and an outer air injection port 48. The axial position of the main air injection port 44 corresponds to the inner air injection port 47 and the outer air injection port 48. The main air injection port 44 is connected to the exhaust end of the bidirectional air pump 3. The inner air injection port 47 and the outer air injection port 48 are respectively connected to the air injection fitting 71 and the air filling pipe 6. In both the return air chamber 41 and the injection air chamber 42, valve plates 49 are adapted to slide and install. A valve stem 410 is axially sealed and slidably inserted from one end of the valve body 411. The two valve plates 49 are fixedly connected to the valve stem 410, so that the valve stem 410 drives the two valve plates 49 to move axially synchronously. This allows one of the inner return air port 45 and the outer return air port 46 to be connected to the main return air port 43, and one of the inner injection air port 47 and the outer injection air port 48 to be connected to the main injection air port 44.

[0045] During cyclic preheating, the valve stem 410 is pushed to drive the valve plate 49 to move axially. Through the isolation of the valve plate 49, the main return port 43 is connected to the inner return port 45, and the main injection port 44 is connected to the inner injection port 47. The exhaust end of the bidirectional air pump 3 drives the gas to enter the injection chamber 42 through the main injection port 44. The gas is introduced into the air bag 7 through the inner injection port 47 and the injection pipe 71. The gas in the mesh chamber enters the return chamber 41 through the return pipe 72 and the inner return port 45, and then returns to the inlet end of the bidirectional air pump 3 through the main return port 43 to achieve cyclic preheating. When inflating the tire, the valve stem 410 is pushed to move the valve plate 49 in the opposite direction. Through the isolation of the valve plate 49, the main air return port 43 is connected to the external air return port 46, and the main air injection port 44 is connected to the external air injection port 48. The exhaust end of the bidirectional air pump 3 drives the gas to enter the air injection chamber 42 through the main air injection port 44. The gas is introduced into the inflation pipe 6 through the external air injection port 48 to inflate the tire. The ambient air enters the air return chamber 41 through the external air return port 46, and then returns to the air intake end of the bidirectional air pump 3 through the main air return port 43.

[0046] The reversing valve 4 switches between the circulating preheating and charging modes by moving the valve stem 410. An adjustment component 5 is connected to the outer end of the valve stem 410 to switch and position the valve stem 410, as detailed below: like Figure 8 , Figure 9As shown, the adjustment assembly 5 includes a connecting handle 51, a groove 53 is formed on the surface of the housing 1, the connecting handle 51 slides along the groove 53, the inner end of the connecting handle 51 is fixedly connected to the valve stem 410, the outer end of the connecting handle 51 passes through the groove 53 and is inserted into a lever 52, two arc-shaped grooves 54 are provided on the outer side of both ends of the groove 53, the lever 52 has an arc-shaped convex surface 55 that fits the arc-shaped grooves 54, a tension spring is connected between the lever 52 and the connecting handle 51, the tension spring applies a tension force to the lever 52 so that the arc-shaped convex surface 55 is inserted into the arc-shaped groove 54.

[0047] When switching the conduction path of the reversing valve 4, force is applied along the sliding direction to push the lever 52 to move the connecting handle 51, causing the valve stem 410 to move axially to switch the channel. Through the arc-shaped convex surface 55 and the arc-shaped groove 54, the lever 52 overcomes the elastic force and slides outward to avoid the position. After the lever 52 passes the initial arc-shaped groove 54, the elastic force causes the arc-shaped convex surface 55 to engage with the adjusted arc-shaped groove 54, thereby locking the position of the lever 52 and the connecting handle 51, and thus locking the axial position of the valve stem 410, maintaining the state of the reversing valve 4 after switching the passage.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A preheating device for an ultra-low temperature start-up power supply, comprising a housing (1) and a battery cell assembly (2), wherein the housing (1) has a battery cell compartment and a control compartment, and the control compartment is equipped with an MCU module (11) and a bidirectional air pump (3), characterized in that, The battery cell assembly (2) is composed of several battery cells arranged with gaps. The battery cell assembly (2) is positioned in the battery cell compartment by upper and lower retainers (21). The battery cell assembly (2), the upper and lower retainers (21), and the battery cell compartment form a sealed mesh chamber. An airbag (7) is provided in the mesh chamber. Flexible heating elements (9) are symmetrically arranged on both sides of the airbag (7). The air inlet of the bidirectional air pump (3) is connected to the mesh chamber through a return air pipe (72). The exhaust end of the bidirectional air pump (3) is connected to the mesh chamber through a return air pipe (72). The air injection fitting (71) is connected to one end of the airbag (7), and the other end of the airbag (7) is provided with an overflow valve (8). The overflow valve (8) is connected to the mesh chamber. The bidirectional air pump (3) supplies air to the airbag (7). The airbag (7) expands so that the flexible heating plate (9) is flat against the battery cells on both sides. The interference gas in the airbag (7) is introduced into the mesh chamber through the overflow valve (8). The bidirectional air pump (3), the flexible heating plate (9), the battery cell assembly (2) and the MCU module (11) are electrically connected.

2. The preheating device for the cryogenic start-up power supply according to claim 1, characterized in that, The outer contour of the retainer (21) is adapted to the cell compartment. The surface of the retainer (21) has a number of slots (211) corresponding to the cells. The outer periphery of the retainer (21) and the inner wall of the slots (211) are provided with sealing strips so that the retainer (21) is sealed and adapted to the cell compartment and the cells are sealed and inserted into the slots (211).

3. The preheating device for the cryogenic start-up power supply according to claim 1, characterized in that, One or more of the cells in the cell group (2) are auxiliary cells, and the remaining cells are main cells. The auxiliary cells are electrically connected to the main cells through the MCU module (11). The bidirectional air pump (3) and the flexible heating element (9) are electrically connected to the auxiliary cells through the MCU module (11).

4. The preheating device for the cryogenic start-up power supply according to claim 1, characterized in that, The upper and lower parts of the airbag (7) are respectively connected to the retainer (21), and the overflow valve (8) and the air injection pipe (71) on both sides of the airbag (7) are respectively connected to the corresponding sides of the battery cell compartment, so that the airbag (7) is tightened around when it is deflated.

5. The preheating device for the cryogenic start-up power supply according to claim 1, characterized in that, The overflow valve (8) includes a valve tube (81), the inner end of which is connected to the air bag (7). A stopper (85) is screwed into the outer port of the valve tube (81). A valve core (82) is adapted to slide inside the valve tube (81). A compression spring is provided between the stopper (85) and the valve core (82). The compression spring pushes the valve core (82) to block the inner end of the valve tube (81). A valve hole (84) is opened on the surface of the valve tube (81) to penetrate the mesh chamber.

6. The preheating device for the cryogenic start-up power supply according to claim 5, characterized in that, The valve tube (81), the air injection pipe (71), and the air return pipe (72) all penetrate the side wall of the battery cell compartment. Two sets of nuts (83) are threaded to the outside of the valve tube (81), the air injection pipe (71), and the air return pipe (72). The two sets of nuts (83) abut against the inner and outer walls of the battery cell compartment, respectively.

7. The preheating device for the cryogenic start-up power supply according to claim 1, characterized in that, The control chamber is equipped with a reversing valve (4). The air inlet and exhaust ends of the bidirectional air pump (3) are connected to the return air pipe (72) and the air injection pipe (71) respectively through the reversing valve (4). The surface of the housing (1) is connected to an air filling pipe (6). The air filling pipe (6) is connected to the exhaust end of the bidirectional air pump (3) through the reversing valve (4).

8. The preheating device for the cryogenic start-up power supply according to claim 7, characterized in that, The reversing valve (4) includes a valve body (411), which has a return air chamber (41) and an injection air chamber (42). The return air chamber (41) is connected to the inlet of the bidirectional air pump (3) through a main return air port (43). The return air chamber (41) has an inner return air port (45) and an outer return air port (46). The axial position of the main return air port (43) corresponds to the inner return air port (45) and the outer return air port (46). The inner return air port (45) and the outer return air port (46) are respectively connected to the return air pipe fitting (72) and the external environment. The injection air chamber (42) is connected to the exhaust end of the bidirectional air pump (3) through a main injection air port (44). The axial position of the port (44) corresponds to the inner air injection port (47) and the outer air injection port (48). The inner air injection port (47) and the outer air injection port (48) are respectively connected to the air injection fitting (71) and the air filling pipe (6). The return air chamber (41) and the air injection chamber (42) are both fitted with sliding valve plates (49). A valve rod (410) is axially slidably inserted at one end of the valve body (411). The valve rod (410) drives the two valve plates (49) to move axially synchronously, so that the inner return air port (45) and the outer return air port (46) are connected to the main return air port (43), and the inner air injection port (47) and the outer air injection port (48) are connected to the main air injection port (44).

9. The preheating device for the cryogenic start-up power supply according to claim 8, characterized in that, The valve stem (410) is connected to an adjustment assembly (5) at its end. The adjustment assembly (5) includes a connecting handle (51). A groove (53) is provided on the surface of the housing (1). The connecting handle (51) slides along the groove (53). The valve stem (410) is fixedly connected to the inner end of the connecting handle (51). The lever (52) is inserted through the groove (53) at the outer end of the connecting handle (51). Two arc-shaped grooves (54) are provided on the outer sides of both ends of the groove (53). The lever (52) has an arc-shaped convex surface (55) that is adapted to the arc-shaped groove (54). A tension spring is connected between the lever (52) and the connecting handle (51). The tension spring applies a pulling force to the lever (52) so that the arc-shaped convex surface (55) is inserted into the arc-shaped groove (54).

10. A preheating method based on the preheating device of the cryogenic start-up power supply according to any one of claims 1-8, characterized in that, Includes the following steps: A. The MCU module (11) controls the bidirectional air pump (3) and the flexible heating plate (9) to work synchronously. The bidirectional air pump (3) injects air into the airbag (7) through the air injection pipe (71). The airbag (7) expands so that the flexible heating plates (9) on both sides are flat against the battery cells on both sides. The flexible heating plates (9) heat the contacted battery cells and heat the gas in the airbag (7) at the same time. B. Continuously inflate the airbag (7). The excess gas in the airbag (7) is introduced into the mesh chamber through the overflow valve (8) to heat each cell evenly. The bidirectional air pump (3) draws out the gas in the mesh chamber through the return air pipe (72), so that the bidirectional air pump drives the gas to circulate between the airbag (7) and the mesh chamber. C. After the battery cell assembly (2) is heated to the set temperature, the MCU module (11) controls the flexible heating element (9) to stop working and controls the bidirectional air pump (3) to work in reverse. The bidirectional air pump (3) draws gas from the air bag (7) to make it contract, so that the flexible heating element (9) is separated from the battery cell.

Images