Temperature control structure of electric vehicle battery pack

Abstract

The invention relates to a temperature control structure of an electric vehicle battery pack applied to the field of temperature measurement, which is characterized in that temperature sensing optical fibers for distributed temperature measurement are arranged in gaps of the battery pack, and the laying state of the temperature sensing optical fibers is fixed through a pair of fixed mounting plates, so that more accurate and comprehensive temperature measurement of single batteries can be realized; the three-axis adjusting piece composed of the two-axis sliding rail and the air guide assembly is adopted to control movement of the fixed mounting plate, the temperature sensing optical fiber is driven to move in the X-axis, Y-axis or Z-axis direction under the condition that the laying track of the temperature sensing optical fiber is not changed, the temperature measuring position of the temperature sensing optical fiber is adjusted, on one hand, the more comprehensive temperature measuring effect on the single battery and the environment where the single battery is located is achieved, and on the other hand, the temperature measuring efficiency is improved. And on the other hand, by comparing the temperature measurement data of each point before and after the position adjustment of the temperature-sensing optical fiber, the temperature measurement accuracy and sensitivity of the temperature-sensing optical fiber can be effectively detected, and the fault problem of the temperature-sensing optical fiber can be found in time, so that the accurate temperature measurement and temperature control operation of the single battery can be effectively ensured.

Description

Technical Field

[0001] The present invention relates to a temperature control structure, and particularly to a temperature control structure for an electric vehicle battery pack applied in the field of temperature measurement. Background Art

[0002] An electric vehicle refers to a vehicle form that uses a power battery as the on-vehicle energy source and an electric motor drive system as the power component, which has the advantages of energy conservation and environmental protection. However, since the safety and reliability of automotive batteries have always been bottleneck problems restricting the development of electric vehicles, how to comprehensively detect the batteries of electric vehicles throughout the entire life cycle of the vehicle, and real-time monitor the usage status of the batteries, has a very important role in further improving the safety and reliability of electric vehicles.

[0003] A distributed optical fiber temperature measurement system realizes temperature monitoring based on the principle of optical time domain reflectometry (OTDR) and the sensitivity of Raman scattering to temperature. It consists of a temperature measurement optical fiber, a temperature measurement host, etc. The temperature-sensitive optical fiber serves as a temperature sensor, providing continuous dynamic monitoring signals, measuring the temperature at each position along the laying direction of the temperature-sensitive optical fiber and locating temperature abnormal points.

[0004] The prior art has realized the application of distributed optical fiber temperature measurement technology to battery temperature monitoring. For example, the specification of Chinese Patent CN117030051B discloses a lithium battery storage temperature monitoring system with distributed optical fiber temperature measurement. By arranging the temperature-sensitive optical fiber in a Z-shaped pattern on the side plate of the storage rack, there is one temperature-sensitive optical fiber from top to bottom in the vertical direction, and each storage rack has multiple temperature-sensitive optical fibers arranged side by side. The multiple temperature-sensitive optical fibers are connected to a single optical fiber temperature measurement host. On the one hand, this reduces both the density of the temperature-sensitive optical fiber and the length of each temperature-sensitive optical fiber. On the other hand, it reduces the influence of environmental factors on the temperature-sensitive optical fiber and improves the sensitivity and reliability of temperature sensing.

[0005] The specification of Chinese Patent CN113865743B discloses an optical fiber distributed battery multi-point temperature measurement system and its application, including an optical fiber distributed temperature measurement module, a section of guiding optical fiber, multiple optical fiber clips, multiple sections of sensing optical fiber, and multiple sections of isolation optical fiber. The structure of the improved optical fiber clip greatly improves the temperature measurement sensitivity, and the sensitivity can be adjusted by adjusting the length of the sensing optical fiber; each two temperature measurement probes are separated by a section of isolation optical fiber, so that the measured signals can be effectively separated and are easy to detect.

[0006] However, when the prior art uses the distributed optical fiber temperature measurement technology to measure the temperature of the battery pack, the optical fiber is mostly set at a fixed position relative to the battery. On the one hand, the measured battery temperature is relatively single. On the other hand, if there are local minor faults in the optical fiber itself, it is easy to affect the temperature measurement accuracy. Summary of the Invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing distributed temperature-measuring optical fiber is mostly fixedly arranged inside the battery pack, and there are defects in the single and incomplete detection positions of the battery, and it is difficult to judge the integrity of the temperature-measuring optical fiber itself.

[0008] To solve the above problems, the present invention provides a temperature control structure for an electric vehicle battery pack, which includes a pair of fixed plates arranged inside the sealed box body and on both sides of the battery pack. The battery pack includes a plurality of monomer batteries arranged evenly. One end of each of the pair of fixed plates away from each other is fixedly connected with a temperature-measuring host and a reflector respectively. A temperature-sensitive optical fiber is electrically connected between the temperature-measuring host and the reflector. The temperature-sensitive optical fiber is horizontally laid between a plurality of monomer batteries. A three-axis adjusting member is connected between the fixed plate and the inner wall of the sealed box body. A cooling box is arranged outside the sealed box body, and a pair of second hoses are connected between the cooling box and the sealed box body. The three-axis adjusting member includes a gas guiding component and a pair of two-axis sliding rails. The gas guiding component includes a first air pump and a pair of air bags. The first air pump is fixedly connected to the upper end of the fixed plate. The pair of air bags are respectively fixedly connected to both ends of the fixed plate, and the upper ends of the air bags are fixedly communicated with a first hose respectively. One end of each of the pair of first hoses away from the air bag is fixedly communicated with the air inlet end and the air outlet end of the first air pump respectively. A pair of two-axis sliding rails are respectively connected between the pair of air bags and the inner wall of the sealed box body. The two-axis sliding rail includes a horizontal rail fixedly connected to the inner wall of the sealed box body. A horizontal sliding seat is horizontally slidably connected to the outer end of the horizontal rail. A vertical rail is fixedly connected to the outer end of the horizontal sliding seat. A vertical sliding seat is vertically slidably connected to the outer end of the vertical rail. The vertical sliding seat is fixedly connected with the air bag.

[0009] As a further supplement to the present application, a fiber placement groove and a pair of inner grooves are formed at one end of each of the pair of fixed plates close to each other. The fiber placement groove is located between the pair of inner grooves. The temperature-sensitive optical fiber passes through the inside of the fiber placement groove, and both sides of it are clamped and fixed by a pair of clamping plates. The clamping plates are fixed on the sealed box body through the cooperation of bolts and the inner grooves.

[0010] As a further supplement to the present application, a rigid rod is fixedly connected between the pair of vertical sliding seats. The air bag is a sealed air bag structure with a through hole in the middle. The rigid rod movably passes through the through hole and the fixed plate and is located inside the fiber placement groove. A pair of convex rings are fixedly connected to the outer end of the rigid rod. The convex rings are located inside the fiber placement groove. When the pair of air bags are in the initial state with the same volume, the temperature-sensitive optical fiber does not contact the surface of the monomer battery, and there is a gap between the pair of convex rings and the pair of inner walls of the fiber placement groove.

[0011] As a further supplement to the present application, an upper pipe and a lower pipe penetrating through itself are fixedly connected to the side end of the sealed box body, and an air pump two is fixedly connected to the side end of the cooling box. The air inlet end of the air pump two is communicated with one end of the heat exchange coil inside the cooling box. One of the flexible hoses two is threadedly connected between the air outlet end of the air pump two and the lower pipe, and the other flexible hose two is threadedly connected between the upper pipe and the cooling box and is communicated with the other end of the heat exchange coil.

[0012] As a further supplement to the present application, the end of the lower pipe located inside the sealed box body is fixedly communicated with an air pipe one. The air pipe one is in a U-shaped structure and surrounds the outside of a plurality of single batteries, and a uniformly distributed air hole one is opened in the part of the air pipe one close to the single batteries.

[0013] As another improvement of the present application, extension plates are fixedly connected to one ends of a pair of vertical sliding seats close to the single batteries. An air pipe two is fixedly connected between the pair of extension plates. The air pipe two is in a U-shaped structure and surrounds the outside of a plurality of single batteries, and a uniformly distributed air hole two is opened in the part of it close to the single batteries. A flexible hose three is communicated between the lower pipe and the air pipe two.

[0014] As another improvement of the present application, telescopic rods are fixedly connected to one ends of a pair of vertical sliding seats close to the single batteries. A thin network pipe is threadedly connected between the pair of telescopic rods. The thin network pipe is horizontally laid between a plurality of single batteries and is vertically distributed above the temperature sensing optical fiber. A flexible hose four is communicated between the lower pipe and the thin network pipe.

[0015] As a supplement to another improvement of the present application, clamping assemblies for two-axis limiting of the thin network pipe are fixedly connected to a pair of inner walls of the sealed box body. The clamping assemblies include a pair of vertical slideways and a pair of horizontal clamping plates. The vertical slideways are fixedly connected to the inner wall of the sealed box body. A pair of T-shaped sliders are fixedly connected to the side end of the horizontal clamping plate. The pair of T-shaped sliders are respectively slidably connected inside the pair of vertical slideways. The pair of horizontal clamping plates are connected by fasteners for clamping a part of the thin network pipe. A plurality of uniformly distributed locking holes are opened in the horizontal clamping plate.

[0016] As a supplement to another improvement of the present application, the telescopic rod includes an outer pipe, an intermediate pipe and an inner rod which are sleeved and connected in an inner and outer sliding manner. Annular plates are fixedly connected to the outer ends of the intermediate pipe and the inner rod. Annular grooves for the annular plates to slide are opened at the inner ends of the outer pipe and the intermediate pipe. The end of the outer pipe is fixedly connected to the vertical sliding seat, and an interface threadedly connected to the thin network pipe is opened at the end of the inner rod.

[0017] In summary, in the present application, a temperature-sensing optical fiber for distributed temperature measurement is arranged inside the gaps of a battery pack composed of multiple single cells, and the laying state of the temperature-sensing optical fiber is fixed by a pair of fixed mounting plates. Compared with the traditional single-point temperature measurement method using a temperature sensor, it can more accurately and comprehensively monitor the heating conditions of multiple single cells. A three-axis adjusting member composed of a two-axis slide rail and a gas guiding component is used to control the movement of the fixed mounting plate, realizing synchronous movement of the temperature-sensing optical fiber, the temperature measurement host, and the reflector in the X-axis, Y-axis, or Z-axis direction without changing the laying trajectory of the temperature-sensing optical fiber, and adjusting the temperature measurement position of the temperature-sensing optical fiber. On the one hand, it can achieve a more comprehensive temperature measurement effect on the single cells and their surrounding environment. On the other hand, by observing the temperature measurement data of each point after the position adjustment of the temperature-sensing optical fiber and comparing it with the original temperature measurement data, the temperature measurement accuracy and sensitivity of the temperature-sensing optical fiber can be effectively detected, and the fault problems of the temperature-sensing optical fiber itself can be timely discovered, thereby effectively ensuring the accurate temperature measurement and temperature control operations of the single cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of the first embodiment of the present application; Figure 2 is a partial perspective view of the interior of the sealed box of the first embodiment of the present application; Figure 3 is a perspective view of the fixed mounting plate and the three-axis adjusting member of the first embodiment of the present application; Figure 4 is a schematic top view of the initial top surface structure of the first embodiment of the present application; Figure 5 is a partial top view of the first embodiment of the present application; Figure 6 is a schematic top view of the first embodiment of the present application when adjusting in the X-axis direction; Figure 7 is a perspective view of the first embodiment of the present application when adjusting in the Z-axis direction; Figure 8 is a schematic top view of the first embodiment of the present application when adjusting in the Y-axis direction; Figure 9 is a partial perspective view of the first embodiment of the present application; Figure 10 is a partial perspective of the second embodiment of the present application Figure 1 ; Figure 11 is a partial perspective of the second embodiment of the present application Figure 2 ; Figure 12 is a partial perspective of the third embodiment of the present application Figure 1 ; Figure 13Partial three-dimensional view of the third embodiment of the present application Figure 2 ; Figure 14 Partial three-dimensional view of the third embodiment of the present application Figure 3 ; Figure 15 Side structure schematic diagram of the telescopic rod in the third embodiment of the present application; Figure 16 Front structure schematic diagram inside the cooling box in the first, second, and third embodiments of the present application.

[0019] Explanation of the reference numerals in the figure: 1 Sealed box body, 101 Upper pipe, 102 Lower pipe, 2 Single battery, 3 Fixed mounting plate, 301 Fiber placement groove, 302 Inner groove, 4 Temperature sensing optical fiber, 5 Temperature measurement host, 6 Reflector, 7 Two-axis slide rail, 71 Horizontal rail, 72 Horizontal slide seat, 73 Vertical rail, 74 Vertical slide seat, 8 Air guide assembly, 81 Air pump one, 82 Airbag, 83 Hose one, 9 Cooling box, 10 Hose two, 11 Air pipe one, 1101 Air hole one, 12 Hard rod, 13 Convex ring, 14 Clamping plate, 15 Air pump two, 16 Extension plate, 17 Hose three, 18 Air pipe two, 1801 Air hole two, 19 Vertical slideway, 20 Horizontal clamping plate, 2001 T-shaped slider, 2002 Lock hole, 21 Fine mesh tube, 22 Telescopic rod, 2201 Outer tube, 2202 Intermediate tube, 2203 Inner rod, 2204 Ring plate, 23 Hose four. Specific embodiments

[0020] The following will describe in detail the three embodiments of the present application with reference to the accompanying drawings.

[0021] The first embodiment: The present invention provides a temperature control structure for an electric vehicle battery pack. Please refer to Figure 1 and Figure 2 , which includes a pair of fixed mounting plates 3 disposed inside the sealed box body 1 and on both sides of the battery pack. The battery pack includes a plurality of uniformly arranged single batteries 2 (in order to conveniently show the internal structure of the sealed box body 1, the top surface structure of the sealed box body 1 is not drawn in the figure). Combining Figure 4As shown in the figure, at the mutually remote ends of a pair of fixed mounting plates 3, a temperature measurement main unit 5 and a reflector 6 are respectively fixedly connected. There is an electrically connected temperature-sensitive optical fiber 4 between the temperature measurement main unit 5 and the reflector 6. The temperature-sensitive optical fiber 4 is horizontally laid between multiple single cells 2. By using the distributed temperature measurement technology of the temperature-sensitive optical fiber 4, continuous temperature measurement of the internal area of the single cell 2 is realized. Since the gas fluidity inside the sealed box 1 is poor, and coupled with the dense distribution of the single cells 2, the heat generated by the single cells 2 is likely to accumulate between adjacent single cells 2. Moreover, due to individual differences among different single cells 2, there are also differences in the heat generation conditions. Therefore, compared with the traditional single-point temperature measurement method using a temperature sensor, the optical fiber distributed temperature measurement technology can more accurately and comprehensively monitor the heat generation conditions of multiple single cells 2. On the outer side of the sealed box 1, there is a cooling box 9. A pair of hoses II 10 are connected between the cooling box 9 and the sealed box 1. Through the cooling box 9 and the hoses II 10, it is convenient to perform circulating cooling on the sealed box 1 when it overheats inside.

[0022] Please refer to Figure 3 , at the mutually close ends of a pair of fixed mounting plates 3, a fiber placement groove 301 and a pair of inner grooves 302 are respectively formed. The fiber placement groove 301 is located between the pair of inner grooves 302. The temperature-sensitive optical fiber 4 passes through the inside of the fiber placement groove 301, and its two sides are clamped and fixed by a pair of clamping plates 14. The clamping plates 14 are fixed on the sealed box 1 through the cooperation of bolts and the inner grooves 302. The specific laying method of the temperature-sensitive optical fiber 4 is as follows: Combining Figure 4 and Figure 5 As shown in the figure, one end of the temperature-sensitive optical fiber 4 passes through a through hole (arranged on the inner wall of the fiber placement groove 301) on the fixed mounting plate 3 and is connected to the temperature measurement main unit 5 to realize data transmission. Then, the temperature-sensitive optical fiber 4 is laid along the gap between two adjacent rows of single cells 2. After laying to the other side of the fixed mounting plate 3, the temperature-sensitive optical fiber 4 is bent and turned around inside the fiber placement groove 301 (the size of the fiber placement groove 301 can be maximally set within a reasonable range to facilitate large-angle bending and commutation of the temperature-sensitive optical fiber 4 inside it), and then enters the gap of another row of single cells 2. To ensure the stability of the laying of the temperature-sensitive optical fiber 4, at the positions where the temperature-sensitive optical fiber 4 penetrates into and out of the fiber placement groove 301, the temperature-sensitive optical fiber 4 is clamped by a pair of clamping plates 14, and then the clamping plates 14 are fixed on the fixed mounting plate 3 using bolts. Furthermore, through a pair of fixed mounting plates 3, multi-point positioning of the laid temperature-sensitive optical fiber 4 is achieved, so that the temperature-sensitive optical fiber 4 is stably laid in the internal gap of the battery pack formed by multiple single cells 2. Rubber pads are fixedly connected to both ends of the fixed mounting plate 3, which is not likely to cause mechanical damage to the temperature-sensitive optical fiber 4 while clamping it.

[0023] Please refer to Figure 2 and Figure 3, a three-axis adjusting member is connected between the fixed mounting plate 3 and the inner wall of the sealed box body 1. The three-axis adjusting member includes an air guiding assembly 8 and a pair of two-axis sliding rails 7. The air guiding assembly 8 includes an air pump 81 and a pair of air bags 82. The air pump 81 is fixedly connected to the upper end of the fixed mounting plate 3. The pair of air bags 82 are respectively fixedly connected to both ends of the fixed mounting plate 3, and the upper ends of the air bags 82 are fixedly communicated with a first flexible pipe 83. The ends of the pair of first flexible pipes 83 far from the air bags 82 are respectively fixedly communicated with the air inlet end and the air outlet end of the air pump 81. The pair of two-axis sliding rails 7 are respectively connected between the pair of air bags 82 and the inner wall of the sealed box body 1. The two-axis sliding rail 7 includes a horizontal rail 71 fixedly connected to the inner wall of the sealed box body 1. A horizontal sliding seat 72 is horizontally slidably connected to the outer end of the horizontal rail 71. A vertical rail 73 is fixedly connected to the outer end of the horizontal sliding seat 72. A vertical sliding seat 74 is vertically slidably connected to the outer end of the vertical rail 73. The vertical sliding seat 74 is fixedly connected to the air bag 82.

[0024] Since the temperature sensing optical fiber 4, the temperature measuring host 5 and the reflector 6 are arranged on a pair of fixed mounting plates 3, when the pair of fixed mounting plates 3 move in a certain direction of the X-axis, Y-axis or Z-axis, the temperature sensing optical fiber 4, the temperature measuring host 5 and the reflector 6 will be driven to move synchronously, so as to adjust the temperature measuring position of the temperature sensing optical fiber 4 without changing the laying track of the temperature sensing optical fiber 4, achieving the following two functions: First, since the fluidity of other parts in the sealed box body 1 is poor, and the heating conditions of different single batteries 2 are different, different positions on the same single battery 2 may also show different temperatures. Therefore, by adjusting the temperature measuring position of the temperature sensing optical fiber 4, a more comprehensive temperature measurement effect on the single battery 2 and its surrounding environment can be achieved. Second, due to different temperature conditions in different regions, by observing the temperature measurement data of each point of the temperature sensing optical fiber 4 after position adjustment and comparing it with the original temperature measurement data, the temperature measurement accuracy and sensitivity of the temperature sensing optical fiber 4 can be effectively detected, and the fault problems of the temperature sensing optical fiber 4 itself can be found in time, so as to achieve a more accurate temperature measurement of the single battery 2. The specific position adjustment method of the temperature sensing optical fiber 4 is as follows: Adjustment in the X-axis direction: As shown in Figure 4 and Figure 6 , by starting the horizontal sliding seats 72, the multiple horizontal sliding seats 72 move in the same direction on the corresponding horizontal rails 71, so that the vertical rails 73, the vertical sliding seats 74 and the fixed mounting plate 3 move in the X-axis direction. At this time, one side of the fixed mounting plate 3 approaches the single battery 2, and the other side of the fixed mounting plate 3 moves away from the single battery 2, and the temperature sensing optical fiber 4 moves along the gap between adjacent single batteries 2, realizing the position change of the temperature sensing optical fiber 4 on the X-axis; Adjustment in the Z-axis direction: As shown in Figure 7 , by starting the multiple vertical sliding seats 74, making them move synchronously upward or downward along the vertical rails 73, driving the fixed mounting plate 3 and the temperature sensing optical fiber 4 to move upward or downward in the gap between adjacent single batteries 2, realizing the position change of the temperature sensing optical fiber 4 on the X-axis; Y-axis direction adjustment: In combination with Figure 4 and Figure 8 As shown, start a pair of air pumps 81, extract the gas in one side airbag 82 and transport it to the airbag 82 on the other side. That is, the volumes of the pair of airbags 82 decrease and increase respectively, thereby driving the fixed mounting plate 3 between them to move. The airbag 82 with a larger volume pushes the fixed mounting plate 3 towards the airbag 82 with a smaller volume (note: the moving directions of the two fixed mounting plates 3 are the same), so as to realize the position change of the temperature-sensitive optical fiber 4 on the Y-axis. Supplementary note: In the initial state, that is, when the temperature-sensitive optical fiber 4 is laid, the temperature-sensitive optical fiber 4 may not be in contact with the two rows of single cells 2. However, since the temperature-sensitive optical fiber 4 is close to the position of the single cells 2, when the two rows of single cells 2 heat up, the temperature can be quickly transferred from the ambient gas to the temperature-sensitive optical fiber 4 to achieve comprehensive temperature measurement; after the above Y-axis direction adjustment in the initial state, the temperature-sensitive optical fiber 4 just contacts the outer wall of a certain row of single cells 2, changing the temperature measurement of the single cells 2 from the original ambient gas temperature measurement to the contact temperature measurement of the single cells 2, further improving the accuracy of temperature measurement of the single cells 2. In addition, after completing the contact temperature measurement of a row of single cells 2, the air pump 81 can be started again to conduct reverse gas transportation, so that the fixed mounting plate 3 moves in the reverse direction, driving the temperature-sensitive optical fiber 4 to contact the other row of single cells 2 for contact temperature measurement.

[0025] The start-up and operation data of the two-axis slide rail 7 and the air guide assembly 8 are preset by those skilled in the art, so that the fixed mounting plate 3 is not prone to excessive movement during the position adjustment process. However, in the Y-axis adjustment, since the airbag 82 is an elastic change structure, there are certain uncontrollable situations. Therefore, in order to improve the accuracy of the Y-axis direction adjustment of the temperature-sensitive optical fiber 4, the following structure is set: In combination with Figure 3 and as shown in Figure, a rigid rod 12 is fixedly connected between a pair of vertical sliding seats 74. The airbag 82 is a sealed airbag structure with a through hole in the middle. The rigid rod 12 movably passes through the through hole and the fixed mounting plate 3 and is located inside the fiber placement groove 301. A pair of convex rings 13 are fixedly connected to the outer end of the rigid rod 12. The convex rings 13 are located inside the fiber placement groove 301. When the pair of airbags 82 are in the initial state with the same volume, the temperature-sensitive optical fiber 4 is not in contact with the surface of the single cells 2, and there is a gap between the pair of convex rings 13 and a pair of inner walls of the fiber placement groove 301. When performing Y-axis direction adjustment, the fixed mounting plate 3 moves along the rigid rod 12. When the temperature-sensitive optical fiber 4 moves to contact a certain row of single cells 2, the fiber placement groove 301 just moves to the position where it touches and abuts against the convex ring 13 (as Figure 8 shown), thus effectively restricting the continuous movement of the fixed mounting plate 3 and the temperature-sensitive optical fiber 4, making the temperature-sensitive optical fiber 4 not easily over-extrude with the single cells 2, not easily damaging the laying state of the temperature-sensitive optical fiber 4, and not easily affecting the temperature measurement data of the temperature-sensitive optical fiber 4.

[0026] Please refer to Figure 9, a side end of the sealed box body 1 is fixedly connected with an upper pipe 101 and a lower pipe 102 that penetrate through itself, a side end of the cooling box 9 is fixedly connected with an air pump two 15, and an air inlet end of the air pump two 15 is communicated with one end of a heat exchange coil pipe inside the cooling box 9 (supplementary description: the structure of the cooling box 9 is as shown in Figure 16 . There is coolant and a heat exchange coil pipe inside the box body, a refrigerator for cooling the coolant is fixedly connected to the inner wall of the box body, and both the head and tail ends of the heat exchange coil pipe fixedly extend outside the box body), one of the hoses two 10 is threadedly connected between the air outlet end of the air pump two 15 and the lower pipe 102, and the other hose two 10 is threadedly connected between the upper pipe 101 and the cooling box 9 and is communicated with the other end of the heat exchange coil pipe. An end of the lower pipe 102 located inside the sealed box body 1 is fixedly communicated with an air pipe one 11. The air pipe one 11 is in a U-shaped structure and surrounds the outside of a plurality of single cells 2, and a uniformly distributed air hole one 1101 is opened in a part of the air pipe one 11 close to the single cells 2. When the temperature sensing optical fiber 4 monitors that there is an overheated area, the refrigerator and the air pump two 15 are started simultaneously, the gas in the heat exchange coil pipe is conveyed into the air pipe one 11, and is dissipated towards the single cells 2 through the air holes one 1101 to cool the sealed box body 1 and the single cells 2. At the same time, the redundant gas inside the sealed box body 1 will enter the other end of the heat exchange coil pipe through the upper pipe 101 and the hose two 10, and is cooled by exchanging heat with the coolant through the heat exchange coil pipe, thereby realizing the circulating cooling operation of the gas in the sealed box body 1. Supplementary description: A controller is arranged on the sealed box body 1, and the electrically related structures such as the temperature measuring host 5, the reflector 6, the two-axis slide rail 7, the air guiding component 8 and the air pump two 15 are all coordinated, commanded and controlled by the controller, so as to realize the intelligent temperature measurement and temperature control operations of the sealed box body 1 and the single cells 2 as described above.

[0027] In this application, in order to facilitate the schematic illustration of the structure, each structure is not drawn strictly according to the proportion. In the specific implementation process, those skilled in the art can reasonably design the dimensions of each structure according to the prior art.

[0028] The second implementation mode: On the basis of the first implementation mode, the following structure is adopted to replace the setting of the air pipe one 11: Please refer to Figure 10 and Figure 11 . One end of a pair of vertical slide seats 74 close to the single cells 2 is fixedly connected with an extension plate 16, and an air pipe two 18 is fixedly connected between the pair of extension plates 16. The air pipe two 18 is in a U-shaped structure and surrounds the outside of a plurality of single cells 2, and a uniformly distributed air hole two 1801 is opened in a part of it close to the single cells 2. A hose three 17 is fixedly communicated between the lower pipe 102 and the air pipe two 18; With the above structure, when it is necessary to cool the inside of the sealed box body 1, the cold air flow enters the second air pipe 18 through the lower pipe 102 and the third hose 17, and is dispersed to the single battery 2 through the second air holes 1801. At the same time, the Z-axis direction adjustment operation can also be performed. At this time, the vertical sliding seat 74 will drive the extension plate 16 and the second air pipe 18 to move up and down synchronously, so that the cold air flow is dynamically released in different height areas, effectively improving the flow efficiency and distribution uniformity of the cold air flow in the battery pack gap. Supplementary explanation: First, the setting of the third hose 17 can adapt to the movement of the second air pipe 18 in the X-axis and Z-axis directions. Second, in order to reduce the movement resistance of the second air pipe 18 to the fixed mounting plate 3 and the temperature-sensitive optical fiber 4 in the X-axis direction, the part of the second air pipe 18 parallel to the fixed mounting plate 3 is arranged directly below the fixed mounting plate 3. In this way, when adjusting in the X-axis direction, the second air pipe 18 is not likely to come into contact with the single battery 2 first and collide. The two end parts of the second air pipe 18 extend upward in an L shape (the position indicated by M in the figure) and are fixedly connected to the lower end of the extension plate 16.

[0029] The third implementation mode: On the basis of the first implementation mode, this implementation mode adopts the following structure to replace the setting of the first air pipe 11: Please refer to Figures 12 to 14 , a telescopic rod 22 is fixedly connected to one end of a pair of vertical sliding seats 74 close to the single battery 2, and a thin network pipe 21 is threadedly connected between the pair of telescopic rods 22. The thin network pipe 21 is horizontally laid between multiple single batteries 2 and is vertically distributed above the temperature-sensitive optical fiber 4. A fourth hose 23 is connected between the lower pipe 102 and the thin network pipe 21. The fourth hose 23 is fixedly connected to the thin network pipe 21 and is threadedly connected to the lower pipe 102. A clamping assembly for two-axis limiting of the thin network pipe 21 is fixedly connected to a pair of inner walls of the sealed box body 1. The clamping assembly includes a pair of vertical slideways 19 and a pair of horizontal clamping plates 20. The vertical slideways 19 are fixedly connected to the inner wall of the sealed box body 1. A pair of T-shaped sliders 2001 are fixedly connected to the side end of the horizontal clamping plate 20. The pair of T-shaped sliders 2001 are respectively slidably connected to the inside of the pair of vertical slideways 19. The pair of horizontal clamping plates 20 are connected by fasteners for clamping a part of the thin network pipe 21. A plurality of uniformly distributed locking holes 2002 are formed in the horizontal clamping plate 20. In order to avoid the thin network pipe 21 clamped between the pair of horizontal clamping plates 20, fasteners can be installed in the locking holes 2002 at appropriate positions. Generally, the fasteners adopt screws and nuts.

[0030] The thin network tube 21 for conveying cold air is arranged between the gaps of adjacent single cells 2, that is, within the battery pack gap. When cooling is required, the cold air flows into the thin network tube 21 through the hose four 23, and then is dispersed and released between the adjacent single cells 2, which can directly and quickly cool the single cell 2. At the same time, the Z-axis direction adjustment operation can be performed. The vertical sliding seat 74 will drive the telescopic rod 22 and the thin network tube 21 to move up and down synchronously. Since the cross clamp 20 and the thin network tube 21 are in a clamped state, the cross clamp 20 will move up and down along the vertical slideway 19, so that the thin network tube 21 releases cold air in different height areas of the battery pack gap, improving the flow efficiency and distribution uniformity of the cold air in the battery pack gap.

[0031] Supplementary description: First, the setting of the hose four 23 can adapt to the movement of the thin network tube 21 in the X-axis and Z-axis directions. Second, through the setting of the telescopic rod 22 and the cross clamp 20, when the fixed mounting plate 3 moves in the X-axis direction, the thin network tube 21 can remain stationary and is not likely to come into contact and collision with the single cell 2. The specific principle is as follows: Since the cross clamp 20 has a clamping effect on the thin network tube 21, the vertical slideway 19 can limit the cross clamp 20 from moving in the X-axis direction, and the telescopic rod 22 has a telescopic function. Therefore, when the fixed mounting plate 3 moves in the X-axis direction, a pair of telescopic rods 22 respectively adapt to the movement of a pair of fixed mounting plates 3, and perform corresponding elongation and retraction, so that the cross clamp 20 and the thin network tube 21 can maintain their positions unchanged.

[0032] As Figure 15 shown, the telescopic rod 22 includes an outer tube 2201, an intermediate tube 2202, and an inner rod 2203 that are sleeved and connected in an inner and outer sliding manner. Ring plates 2204 are fixedly connected to the outer ends of the intermediate tube 2202 and the inner rod 2203. Annular grooves for the ring plates 2204 to slide are provided at the inner ends of the outer tube 2201 and the intermediate tube 2202. The end of the outer tube 2201 is fixedly connected to the vertical sliding seat 74, and an interface for threaded connection with the thin network tube 21 is provided at the end of the inner rod 2203. Through the above structure, the free telescopic function of the telescopic rod 22 is realized. Moreover, since the ring plate 2204 can also rotate in the annular groove, when installing and disassembling the thin network tube 21, by manually stabilizing the thin network tube 21 and then rotating the inner rod 2203, the connection and disassembly of the thin network tube 21 and the interface can be carried out. Then, through the disassembly and assembly between the hose four 23 and the lower tube 102, the installation and disassembly of the thin network tube 21 within the battery pack gap are realized.

[0033] Combined with the current actual requirements, the above-mentioned implementation method adopted in this application, the protection scope is not limited to this. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A temperature control structure for an electric vehicle battery pack, comprising a pair of fixed plates (3) disposed inside a sealed box body (1) and on both sides of the battery pack. The battery pack includes a plurality of single cells (2) arranged uniformly, and is characterized in that: One end of each of the two fixed mounting plates (3) away from each other is fixedly connected with a temperature measurement host (5) and a reflector (6) respectively. A temperature sensing optical fiber (4) is electrically connected between the temperature measurement host (5) and the reflector (6). The temperature sensing optical fiber (4) is horizontally laid between multiple single cells (2). A three-axis adjusting member is connected between the fixed mounting plate (3) and the inner wall of the sealed box body (1). A cooling box (9) is arranged outside the sealed box body (1). A pair of hoses two (10) are connected between the cooling box (9) and the sealed box body (1); The three-axis adjusting member includes a gas guiding component (8) and a pair of two-axis slide rails (7). The gas guiding component (8) includes an air pump one (81) and a pair of air bags (82). The air pump one (81) is fixedly connected to the upper end of the fixed mounting plate (3). A pair of the air bags (82) are respectively fixedly connected to both ends of the fixed mounting plate (3). And the upper ends of the air bags (82) are fixedly communicated with a hose one (83) respectively. One end of each of the pair of hoses one (83) away from the air bag (82) is fixedly communicated with the intake end and the outlet end of the air pump one (81); A pair of the two-axis slide rails (7) are respectively connected between a pair of air bags (82) and the inner wall of the sealed box body (1). The two-axis slide rail (7) includes a horizontal guide rail (71) fixedly connected to the inner wall of the sealed box body (1). A horizontal slide seat (72) is horizontally slidably connected to the outer end of the horizontal guide rail (71). A vertical guide rail (73) is fixedly connected to the outer end of the horizontal slide seat (72). A vertical slide seat (74) is vertically slidably connected to the outer end of the vertical guide rail (73). The vertical slide seat (74) is fixedly connected with the air bag (82).

2. The temperature control structure of an electric vehicle battery pack according to claim 1, characterized in that: One end of each of the two fixed mounting plates (3) close to each other is provided with a fiber placement groove (301) and a pair of inner grooves (302). The fiber placement groove (301) is located between the pair of inner grooves (302). The temperature sensing optical fiber (4) passes through the inside of the fiber placement groove (301). And its two sides are clamped and fixed by a pair of clamping plates (14). The clamping plates (14) are fixed on the sealed box body (1) through the cooperation of bolts and the inner grooves (302).

3. The temperature control structure of an electric vehicle battery pack according to claim 2, characterized in that: A rigid rod (12) is fixedly connected between the pair of vertical slide seats (74). The air bag (82) is a sealed air bag structure with a through hole in the middle. The rigid rod (12) movably passes through the through hole and the fixed mounting plate (3) and is located inside the fiber placement groove (301). A pair of convex rings (13) are fixedly connected to the outer end of the rigid rod (12). The convex rings (13) are located inside the fiber placement groove (301). When the pair of air bags (82) are in the initial state with the same volume, the temperature sensing optical fiber (4) does not contact the surface of the single cell (2). And there is a gap between the pair of convex rings (13) and a pair of inner walls of the fiber placement groove (301).

4. The temperature control structure of an electric vehicle battery pack according to claim 1, characterized in that: A upper pipe (101) and a lower pipe (102) penetrating through itself are fixedly connected to the side end of the sealed box body (1). An air pump two (15) is fixedly connected to the side end of the cooling box (9). The air inlet end of the air pump two (15) is communicated with one end of a heat exchange coil pipe inside the cooling box (9). One of the flexible hoses two (10) is threadedly connected between the air outlet end of the air pump two (15) and the lower pipe (102). The other flexible hose two (10) is threadedly connected between the upper pipe (101) and the cooling box (9) and is communicated with the other end of the heat exchange coil pipe.

5. The temperature control structure of an electric vehicle battery pack according to claim 4, characterized in that: An air pipe one (11) is fixedly communicated with the end of the lower pipe (102) located inside the sealed box body (1). The air pipe one (11) is in a U-shaped structure and surrounds the outside of a plurality of single cells (2). And a plurality of uniformly distributed air holes one (1101) are formed in the part of the air pipe one (11) close to the single cells (2).

6. The temperature control structure of an electric vehicle battery pack according to claim 4, characterized in that: An extension plate (16) is fixedly connected to one end of each of a pair of vertical sliding seats (74) close to the single cells (2). An air pipe two (18) is fixedly connected between the pair of extension plates (16). The air pipe two (18) is in a U-shaped structure and surrounds the outside of a plurality of single cells (2). And a plurality of uniformly distributed air holes two (1801) are formed in the part of it close to the single cells (2). A flexible hose three (17) is communicated between the lower pipe (102) and the air pipe two (18).

7. The temperature control structure of an electric vehicle battery pack according to claim 4, characterized in that: An expansion rod (22) is fixedly connected to one end of each of a pair of vertical sliding seats (74) close to the single cells (2). A thin network pipe (21) is threadedly connected between the pair of expansion rods (22). The thin network pipe (21) is horizontally laid between a plurality of single cells (2) and is vertically distributed above the temperature sensing optical fiber (4). A flexible hose four (23) is communicated between the lower pipe (102) and the thin network pipe (21).

8. The temperature control structure of an electric vehicle battery pack according to claim 7, characterized in that: Clamping assemblies for two-axis limiting of the thin network pipe (21) are fixedly connected to a pair of inner walls of the sealed box body (1). The clamping assemblies include a pair of vertical slideways (19) and a pair of horizontal clamping plates (20). The vertical slideways (19) are fixedly connected to the inner wall of the sealed box body (1). A pair of T-shaped sliders (2001) are fixedly connected to the side end of the horizontal clamping plate (20). The pair of T-shaped sliders (2001) are respectively slidably connected inside the pair of vertical slideways (19). The pair of horizontal clamping plates (20) are connected by fasteners for clamping a part of the thin network pipe (21). A plurality of uniformly distributed locking holes (2002) are formed in the horizontal clamping plate (20).

9. The temperature control structure of an electric vehicle battery pack according to claim 7, characterized in that: The expansion rod (22) includes an outer pipe (2201), an intermediate pipe (2202) and an inner rod (2203) which are sleeved and connected in an inner and outer sliding manner. Annular plates (2204) are fixedly connected to the outer ends of the intermediate pipe (2202) and the inner rod (2203). Annular grooves for the annular plates (2204) to slide are formed at the inner ends of the outer pipe (2201) and the intermediate pipe (2202). The end of the outer pipe (2201) is fixedly connected to the vertical sliding seat (74). The end of the inner rod (2203) is provided with an interface threadedly connected to the thin network pipe (21).

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