Temperature control structure for an electric vehicle battery pack

Abstract

The application relates to a temperature control structure of an electric vehicle battery pack applied to the field of temperature measurement. The temperature control structure is characterized in that a distributed temperature measurement temperature sensing optical fiber is arranged in the gap between the battery pack, and the laying state of the temperature sensing optical fiber is fixed through a pair of fixed plates, so that more accurate and comprehensive temperature measurement of single batteries can be realized. A three-axis adjusting piece composed of a two-axis sliding rail and a gas guide assembly is used to control the movement of the fixed plate, so that the temperature sensing optical fiber is driven to move in the X-axis, Y-axis or Z-axis direction without changing the laying track of the temperature sensing optical fiber, and the temperature measurement position is adjusted. On the one hand, the single battery and the environment thereof are more comprehensively measured, and on the other hand, the temperature measurement accuracy and sensitivity of the temperature sensing optical fiber can be effectively detected by comparing the temperature measurement data of each point before and after the position adjustment of the temperature sensing optical fiber, so that the fault problems of the temperature sensing optical fiber itself can be found in time, and the accurate temperature measurement and temperature control operation of the single battery are effectively ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to a temperature control structure, in particular to a temperature control structure of an electric vehicle battery pack applied to the field of temperature measurement. BACKGROUND

[0002] An electric vehicle refers to a vehicle form with a power battery as a vehicle-mounted energy and an electric motor driving system as a power component, which has the advantages of energy saving and environmental protection. However, the safety and reliability of the battery of the vehicle have been a bottleneck problem restricting the development of the electric vehicle. How to comprehensively detect the battery of the electric vehicle in the whole life cycle of the vehicle and monitor the use state of the battery in real time has a very important role in further improving the safety and reliability of the electric vehicle.

[0003] A distributed optical fiber temperature measurement system is composed of a temperature measurement optical fiber, a temperature measurement host and other parts, and realizes temperature monitoring based on the principle of optical time domain reflection (OTDR) and the sensitivity of Raman scattering effect to temperature. The temperature sensing optical fiber serves as a temperature sensor to provide a continuous dynamic monitoring signal, measure the temperature of each position in the laying direction of the temperature sensing optical fiber and locate the temperature abnormal points.

[0004] The prior art has realized the application of the distributed optical fiber temperature measurement technology to battery temperature monitoring. For example, the specification of Chinese patent CN117030051B discloses a distributed optical fiber temperature measurement lithium battery storage temperature monitoring system. The temperature sensing optical fibers are arranged in a Z shape on the side plates of the storage shelves, so that there is one temperature sensing optical fiber from top to bottom in the vertical direction, and each storage shelf has multiple temperature sensing optical fibers arranged side by side. The multiple temperature sensing optical fibers are connected to one optical fiber temperature measurement host, thereby reducing the density of the temperature sensing optical fibers and the length of each temperature sensing optical fiber, reducing the influence of environmental factors on the temperature sensing optical fibers and improving 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 application, which includes an optical fiber distributed temperature measurement module, a section of guide optical fiber, multiple optical fiber clamps, multiple sections of sensing optical fibers and multiple sections of isolation optical fibers. The structure of the optical fiber clamp is improved to greatly improve the temperature measurement sensitivity, and the sensitivity can be adjusted by adjusting the length of the sensing optical fiber. The measured signals can be effectively separated by a section of isolation optical fiber between every two temperature measurement probes, which is easy to detect.

[0006] However, in the prior art, the optical fibers are mostly arranged at fixed positions relative to the battery when the distributed optical fiber temperature measurement technology is used to measure the temperature of the battery pack. On the one hand, the measured battery temperature is relatively single. On the other hand, if there is a slight local fault in the optical fiber itself, the temperature measurement accuracy will be affected. SUMMARY

[0007] In view of the prior art, the present application aims to solve the technical problem that the existing distributed temperature measurement optical fiber is fixedly arranged inside the battery pack, which has the defects of single and incomplete detection position of the battery and difficulty in judging the integrity of the temperature measurement optical fiber.

[0008] To solve the above problems, the present application provides a temperature control structure of an electric vehicle battery pack, which comprises a pair of fixed plates arranged inside a sealed box and located on both sides of the battery pack, the battery pack comprising a plurality of single batteries arranged uniformly, the fixed plates being fixedly connected with a temperature measurement host and a reflector at the ends away from each other, the temperature measurement host and the reflector being electrically connected with a temperature sensing optical fiber, the temperature sensing optical fiber being horizontally laid between the plurality of single batteries, the fixed plates being connected with a three-axis adjusting piece between the fixed plates and the inner wall of the sealed box, the outer side of the sealed box being provided with a cooling box, and the cooling box being connected with a pair of hoses two between the cooling box and the sealed box.

[0009] The three-axis adjusting piece comprises a gas guide assembly and a pair of two-axis sliding rails, the gas guide assembly comprising a gas pump one and a pair of air bags, the gas pump one being fixedly connected to the upper end of the fixed plate, the pair of air bags being fixedly connected to the two ends of the fixed plate, and the upper end of each air bag being fixedly connected with a hose one, the ends of the pair of hoses one away from the air bags being fixedly connected with the gas inlet end and the gas outlet end of the gas pump one respectively.

[0010] The pair of two-axis sliding rails are connected between the pair of air bags and the inner wall of the sealed box, the two-axis sliding rail comprising a horizontal guide rail fixedly connected with the inner wall of the sealed box, the outer end of the horizontal guide rail being horizontally slidably connected with a horizontal sliding seat, the outer end of the horizontal sliding seat being fixedly connected with a vertical guide rail, the outer end of the vertical guide rail being vertically slidably connected with a vertical sliding seat, and the vertical sliding seat being fixedly connected with the air bag.

[0011] As a further supplement to the present application, the ends of the pair of fixed plates close to each other are each provided with a fiber placement groove and a pair of inner grooves, the fiber placement groove being located between the pair of inner grooves, the temperature sensing optical fiber passing through the inside of the fiber placement groove and being clamped and fixed by a pair of clamping plates on both sides, and the clamping plates being fixed on the sealed box by cooperation of bolts and the inner grooves.

[0012] As a further supplement to the present application, a hard rod is fixedly connected between the pair of vertical sliding seats, the air bag is a closed air bag structure with a through hole in the middle, the hard rod movably penetrates the through hole and the fixed plate and is located in the inside of the fiber placement groove, the outer end of the hard rod is fixedly connected with a pair of convex rings, the convex rings are located in the inside of the fiber placement groove, when the pair of air bags are in the initial state with the same volume, the temperature sensing optical fiber does not contact the surface of the single battery, and there is a gap between the pair of convex rings and the pair of inner walls of the fiber placement groove.

[0013] As a further supplement to this application, the side end of the sealed box body is fixedly connected with an upper pipe and a lower pipe penetrating through itself, the side end of the cooling box is fixedly connected with an air pump two, the air inlet end of the air pump two is communicated with one end of the heat exchange coil pipe in the cooling box, one of the two hoses two is threadedly connected between the air outlet end of the air pump two and the lower pipe, and the other hose two is threadedly connected between the upper pipe and the cooling box and communicated with the other end of the heat exchange coil pipe.

[0014] As a further supplement to this application, the end of the lower pipe located in the sealed box body is fixedly communicated with an air pipe one, the air pipe one is arranged in a U-shaped structure around the outside of the plurality of single batteries, and the portion of the air pipe one close to the single battery is provided with uniformly distributed air holes one.

[0015] As a further supplement to this application, the end of the lower pipe located in the sealed box body is fixedly communicated with an air pipe one, the air pipe one is arranged in a U-shaped structure around the outside of the plurality of single batteries, and the portion of the air pipe one close to the single battery is provided with uniformly distributed air holes one.

[0016] As a further supplement to this application, the end of the lower pipe located in the sealed box body is fixedly communicated with an air pipe one, the air pipe one is arranged in a U-shaped structure around the outside of the plurality of single batteries, and the portion of the air pipe one close to the single battery is provided with uniformly distributed air holes one.

[0017] As a further supplement to this application, the end of the lower pipe located in the sealed box body is fixedly communicated with an air pipe one, the air pipe one is arranged in a U-shaped structure around the outside of the plurality of single batteries, and the portion of the air pipe one close to the single battery is provided with uniformly distributed air holes one.

[0018] As a further supplement to this application, the end of the lower pipe located in the sealed box body is fixedly communicated with an air pipe one, the air pipe one is arranged in a U-shaped structure around the outside of the plurality of single batteries, and the portion of the air pipe one close to the single battery is provided with uniformly distributed air holes one.

[0019] In summary, the application sets a distributed temperature sensing fiber in the gap between the battery pack composed of multiple single batteries, and fixes the laying state of the temperature sensing fiber through a pair of fixed plates. Compared with the traditional single-point temperature measurement method using temperature sensors, the application can more accurately and comprehensively monitor the heating condition of multiple single batteries. The three-axis adjusting member composed of two-axis sliding rails and air guide components controls the movement of the fixed plate, realizes the synchronous movement of the temperature sensing fiber, temperature measurement host and reflector in the X-axis, Y-axis or Z-axis direction without changing the laying track of the temperature sensing fiber, adjusts the temperature measurement position of the temperature sensing fiber, on the one hand, more comprehensively measures the temperature of the single battery and its environment, on the other hand, compares the temperature measurement data of each point of the temperature sensing fiber after position adjustment with the original temperature measurement data, which can effectively detect the temperature measurement accuracy and sensitivity of the temperature sensing fiber, and timely find out the fault problem of the temperature sensing fiber itself, thereby effectively ensuring the accurate temperature measurement and temperature control operation of the single battery. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the first embodiment of the application;

[0021] Figure 2 It is a partial perspective view of the sealed box body of the first embodiment of the application;

[0022] Figure 3 It is a perspective view of the fixed plate and three-axis adjusting member of the first embodiment of the application;

[0023] Figure 4 It is a schematic view of the initial top surface structure of the first embodiment of the application;

[0024] Figure 5 It is a schematic view of the local top surface structure of the first embodiment of the application;

[0025] Figure 6 It is a schematic view of the top surface structure when adjusting in the X-axis direction in the first embodiment of the application;

[0026] Figure 7 It is a perspective view when adjusting in the Z-axis direction in the first embodiment of the application;

[0027] Figure 8 It is a schematic view of the top surface structure when adjusting in the Y-axis direction in the first embodiment of the application;

[0028] Figure 9 It is a partial perspective view of the first embodiment of the application;

[0029] Figure 10 It is a partial perspective view of the second embodiment of the application; Figure 1 ​

[0030] Figure 11 Partially stereoscopic view of the second embodiment of the present application Figure 2 ;

[0031] Figure 12 Partially stereoscopic view of the third embodiment of the present application Figure 1 ;

[0032] Figure 13 Partially stereoscopic view of the third embodiment of the present application Figure 2 ;

[0033] Figure 14 Partially stereoscopic view of the third embodiment of the present application Figure 3 ;

[0034] Figure 15 Schematic view of the side structure of the telescopic rod in the third embodiment of the present application

[0035] Figure 16 Schematic view of the front structure of the inside of the cooling box in the first, second and third embodiments of the present application

[0036] Explanation of the reference numerals in the drawings:

[0037] 1 sealed box body, 101 upper pipe, 102 lower pipe, 2 single battery, 3 fixed plate, 301 fiber groove, 302 inner groove, 4 temperature sensing optical fiber, 5 temperature measuring host, 6 reflector, 7 two-axis slide rail, 71 horizontal guide rail, 72 horizontal slide seat, 73 vertical guide rail, 74 vertical slide seat, 8 air guide assembly, 81 air pump one, 82 air bag, 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 slide, 20 horizontal clamping plate, 2001 T-shaped slide block, 2002 lock hole, 21 fine mesh pipe, 22 telescopic rod, 2201 outer pipe, 2202 intermediate pipe, 2203 inner rod, 2204 annular plate, 23 hose four DETAILED DESCRIPTION

[0038] The three embodiments of the present application will be described in detail below with reference to the drawings.

[0039] First embodiment:

[0040] The present application provides a temperature control structure for an electric vehicle battery pack, please refer to Figure 1 and Figure 2 , including a pair of fixed plates 3 arranged inside the sealed box body 1 and located on both sides of the battery pack, the battery pack includes a plurality of uniformly arranged single batteries 2 (for the convenience of showing the internal structure of the sealed box body 1, the top surface structure of the sealed box body 1 is not shown in the figure), in combination with Figure 4As shown, one end of the pair of fixed plates 3 is fixedly connected with the temperature measuring host 5 and the reflector 6 respectively, and the temperature measuring host 5 and the reflector 6 are electrically connected with the temperature sensing optical fiber 4. The temperature sensing optical fiber 4 is horizontally laid between the plurality of single batteries 2. The distributed temperature measurement technology of the temperature sensing optical fiber 4 is used to realize continuous temperature measurement of the internal region of the single battery 2. Since the gas flowability in the sealed box body 1 is poor, and the single batteries 2 are densely distributed, the heat generated by the single batteries 2 is easily accumulated between adjacent single batteries 2. Due to individual differences, the heating conditions of different single batteries 2 are also different. Therefore, compared with the traditional single-point temperature measurement method using temperature sensors, the optical fiber distributed temperature measurement technology can more accurately and comprehensively monitor the heating conditions of the plurality of single batteries 2. The outer side of the sealed box body 1 is provided with a cooling box 9. A pair of hoses 10 are connected between the cooling box 9 and the sealed box body 1. The cooling box 9 and the hoses 10 facilitate the circulation cooling of the sealed box body 1 when it is overheated.

[0041] Please refer to Figure 3 One end of the pair of fixed plates 3 is fixedly connected with the temperature measuring host 5 and the reflector 6 respectively, and the temperature measuring host 5 and the reflector 6 are electrically connected with the temperature sensing optical fiber 4. The temperature sensing optical fiber 4 is horizontally laid between the plurality of single batteries 2. The distributed temperature measurement technology of the temperature sensing optical fiber 4 is used to realize continuous temperature measurement of the internal region of the single battery 2. Since the gas flowability in the sealed box body 1 is poor, and the single batteries 2 are densely distributed, the heat generated by the single batteries 2 is easily accumulated between adjacent single batteries 2. Due to individual differences, the heating conditions of different single batteries 2 are also different. Therefore, compared with the traditional single-point temperature measurement method using temperature sensors, the optical fiber distributed temperature measurement technology can more accurately and comprehensively monitor the heating conditions of the plurality of single batteries 2. The outer side of the sealed box body 1 is provided with a cooling box 9. A pair of hoses 10 are connected between the cooling box 9 and the sealed box body 1. The cooling box 9 and the hoses 10 facilitate the circulation cooling of the sealed box body 1 when it is overheated. Figure 4 and Figure 5 As shown, one end of the pair of fixed plates 3 is fixedly connected with the temperature measuring host 5 and the reflector 6 respectively, and the temperature measuring host 5 and the reflector 6 are electrically connected with the temperature sensing optical fiber 4. The temperature sensing optical fiber 4 is horizontally laid between the plurality of single batteries 2. The distributed temperature measurement technology of the temperature sensing optical fiber 4 is used to realize continuous temperature measurement of the internal region of the single battery 2. Since the gas flowability in the sealed box body 1 is poor, and the single batteries 2 are densely distributed, the heat generated by the single batteries 2 is easily accumulated between adjacent single batteries 2. Due to individual differences, the heating conditions of different single batteries 2 are also different. Therefore, compared with the traditional single-point temperature measurement method using temperature sensors, the optical fiber distributed temperature measurement technology can more accurately and comprehensively monitor the heating conditions of the plurality of single batteries 2. The outer side of the sealed box body 1 is provided with a cooling box 9. A pair of hoses 10 are connected between the cooling box 9 and the sealed box body 1. The cooling box 9 and the hoses 10 facilitate the circulation cooling of the sealed box body 1 when it is overheated.

[0042] Please refer to Figure 2 and Figure 3The three-axis adjusting piece is connected between the fixed plate 3 and the inner wall of the sealed box body 1, and comprises a gas guide assembly 8 and a pair of two-axis sliding rails 7. The gas guide assembly 8 comprises a gas pump 81 and a pair of air bags 82. The gas pump 81 is fixedly connected to the upper end of the fixed plate 3. The air bags 82 are fixedly connected to the two ends of the fixed plate 3, respectively. The upper end of each air bag 82 is fixedly connected with a soft pipe 83. The soft pipes 83 are fixedly connected with the gas inlet end and the gas outlet end of the gas pump 81, respectively. The two-axis sliding rails 7 are connected between the air bags 82 and the inner wall of the sealed box body 1. The two-axis sliding rail 7 comprises a horizontal guide rail 71 fixedly connected with the inner wall of the sealed box body 1. The outer end of the horizontal guide rail 71 is horizontally slidably connected with a horizontal sliding seat 72. The outer end of the horizontal sliding seat 72 is fixedly connected with a vertical guide rail 73. The outer end of the vertical guide rail 73 is vertically slidably connected with a vertical sliding seat 74. The vertical sliding seat 74 is fixedly connected with the air bag 82.

[0043] Since the temperature sensing optical fiber 4, the temperature measuring host 5 and the reflector 6 are arranged on the pair of fixed plates 3, when the pair of fixed plates 3 moves in the X-axis, Y-axis or Z-axis direction, the temperature sensing optical fiber 4, the temperature measuring host 5 and the reflector 6 are driven to move synchronously, so that the temperature measuring position of the temperature sensing optical fiber 4 is adjusted without changing the laying track of the temperature sensing optical fiber 4, thereby achieving the following two effects: firstly, since the other parts in the sealed box body 1 have poor fluidity, and the heating conditions of different single batteries 2 are different, different positions on the same single battery 2 may also have different temperatures, so that the temperature measuring position of the temperature sensing optical fiber 4 is adjusted, the temperature measuring effect on the single battery 2 and the environment thereof can be more comprehensive; secondly, since different regions have different temperatures, by observing the temperature measuring data of each point of the temperature sensing optical fiber 4 after the position adjustment, and comparing the data with the original temperature measuring data, the temperature measuring accuracy and sensitivity of the temperature sensing optical fiber 4 can be effectively detected, and the fault of the temperature sensing optical fiber 4 can be found in time, so that the single battery 2 can be measured more accurately. The specific position adjustment mode of the temperature sensing optical fiber 4 is as follows:

[0044] X-axis direction adjustment: as shown in Figure 4 and Figure 6 , by starting the horizontal sliding seat 72, the plurality of horizontal sliding seats 72 move in the same direction on the corresponding horizontal guide rails 71, the vertical guide rails 73, the vertical sliding seats 74 and the fixed plates 3 move in the X-axis direction. At this time, one side of the fixed plate 3 is close to the single battery 2, and the other side of the fixed plate 3 is away from the single battery 2. The temperature sensing optical fiber 4 moves along the gap between the adjacent single batteries 2, so that the position of the temperature sensing optical fiber 4 in the X-axis direction is changed.

[0045] Z-axis direction adjustment: as shown in Figure 7As shown, by starting multiple vertical slides 74 to move upward or downward along the vertical guide rail 73 synchronously, the fixed plate 3 and the temperature sensing fiber 4 are driven to move upward or downward in the gap between the adjacent single batteries 2, realizing the position change of the temperature sensing fiber 4 on the X axis.

[0046] Y-axis direction adjustment: combined with Figure 4 and Figure 8 As shown, a pair of air pumps 81 are started to pump the gas in one air bag 82 out and deliver it to the other air bag 82, that is, the volume of the pair of air bags 82 respectively decreases and increases, thereby driving the fixed plate 3 between them to move, and the air bag 82 with larger volume pushes the fixed plate 3 to the direction of the air bag 82 with smaller volume (note that the moving direction of the two fixed plates 3 is the same), thereby realizing the position change of the temperature sensing fiber 4 on the Y axis. It is further explained that in the initial state, that is, when the temperature sensing fiber 4 is laid, the temperature sensing fiber 4 can not be in contact with the two rows of single batteries 2, but since the temperature sensing fiber 4 is close to the single batteries 2, when the two rows of single batteries 2 heat up, the temperature can be quickly transferred from the ambient gas to the temperature sensing fiber 4, realizing overall temperature measurement. After the above Y-axis direction adjustment in the initial state, the temperature sensing fiber 4 is just in contact with the outer wall of a certain row of single batteries 2, so that the single battery 2 changes from the original ambient gas temperature measurement to contact temperature measurement of the single battery 2, further improving the accuracy of the temperature measurement of the single battery 2. In addition, after completing the contact temperature measurement of a row of single batteries 2, the air pump 81 can be started again to deliver the gas in the opposite direction, so that the fixed plate 3 moves reversely, driving the temperature sensing fiber 4 to contact with another row of single batteries 2 for contact temperature measurement.

[0047] The starting and running data of the two-axis slide rail 7 and the air guide assembly 8 are pre-set by those skilled in the art, so that the fixed plate 3 is not easy to move excessively during the position adjustment. However, in the Y-axis adjustment, since the air bag 82 is a flexible change structure, there is a certain uncontrollable condition. Therefore, in order to improve the accuracy of the temperature sensing fiber 4 in the Y-axis direction adjustment, the following structure is provided: combined with Figure 3 and as shown, a pair of vertical slides 74 are fixedly connected with a hard rod 12, the air bag 82 is a closed air bag structure with a through hole in the middle, the hard rod 12 movably penetrates the through hole and the fixed plate 3 and is located inside the fiber placement groove 301, the outer end of the hard rod 12 is fixedly connected with a pair of convex rings 13, the convex rings 13 are located inside the fiber placement groove 301, when a pair of air bags 82 are in the initial state with the same volume, the temperature sensing fiber 4 is not in contact with the surface of the single battery 2, and there is a gap between a pair of convex rings 13 and a pair of inner walls of the fiber placement groove 301, when the Y-axis direction adjustment is performed, the fixed plate 3 moves along the hard rod 12, when the temperature sensing fiber 4 moves to contact with a certain row of single batteries 2, the fiber placement groove 301 just moves to the position of touching and abutting the convex ring 13 (for example, Figure 8The temperature sensing fiber 4 is prevented from being excessively pressed against the single battery 2, the laying state of the temperature sensing fiber 4 is prevented from being damaged, and the temperature sensing data of the temperature sensing fiber 4 is prevented from being affected.

[0048] Please refer to Figure 9 The side end of the sealed box 1 is fixedly connected with an upper pipe 101 and a lower pipe 102 penetrating through the sealed box 1, and the side end of the cooling box 9 is fixedly connected with an air pump two 15. The air inlet end of the air pump two 15 is in communication with one end of a heat exchange coil in the cooling box 9 (as shown in Figure 16 The inside of the box is provided with cooling liquid and the heat exchange coil, and the inner wall of the box is fixedly connected with a refrigerating device for cooling the cooling liquid. The first end and the second end of the heat exchange coil are fixedly extended outside the box), one of the two 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 in communication with the other end of the heat exchange coil. The end of the lower pipe 102 located inside the sealed box 1 is fixedly connected with an air pipe one 11. The air pipe one 11 is in a U-shaped structure and surrounds the outside of the plurality of single batteries 2. The part of the air pipe one 11 close to the single batteries 2 is provided with uniformly distributed air holes one 1101. When the temperature sensing fiber 4 detects an overheating area, the refrigerating device and the air pump two 15 are started simultaneously to transport the gas in the heat exchange coil to the air pipe one 11 and discharge the gas towards the single batteries 2 through the air holes one 1101 to cool the sealed box 1 and the single batteries 2. At the same time, the excess gas in the sealed box 1 enters the other end of the heat exchange coil through the upper pipe 101 and the hose two 10, exchanges heat with the cooling liquid through the heat exchange coil to be cooled, thereby realizing the operation of circulating and cooling the gas in the sealed box 1. It is to be noted that the sealed box 1 is provided with a controller. The temperature measuring host 5, the reflector 6, the two-axis slide rail 7, the air guiding assembly 8, the air pump two 15 and other electrical structures are coordinated and controlled by the controller, thereby realizing the intelligent temperature measurement and temperature control of the sealed box 1 and the single batteries 2.

[0049] In this application, in order to facilitate the illustration of the structure, each structure is not strictly drawn according to the proportion. In the specific implementation process, those skilled in the art can reasonably design the size of each structure according to the prior art.

[0050] The second embodiment:

[0051] The second embodiment: Figure 10 and Figure 11The extension plates 16 are fixedly connected to the vertical sliding seats 74 near one end of the single battery 2, and the air pipe 2 is fixedly connected between the two extension plates 16. The air pipe 2 is in a U-shaped structure and surrounds the plurality of single batteries 2. The part of the air pipe 2 near the single battery 2 is provided with uniformly distributed air holes 201. The soft tube 3 is fixedly connected between the lower pipe 102 and the air pipe 2.

[0052] Through the above structure, when the inside of the sealed box 1 needs to be cooled, the cold air flows into the air pipe 2 through the lower pipe 102 and the soft tube 3, and is discharged to the single battery 2 through the air holes 201. At the same time, Z-axis direction adjustment operation can also be performed. At this time, the vertical sliding seat 74 drives the extension plate 16 and the air pipe 2 to move synchronously up and down, so that the cold air flow is dynamically released at different height areas, effectively improving the flow efficiency and distribution uniformity of the cold air flow in the battery pack gap. It is specified that: 1. The soft tube 3 can adapt to the movement of the air pipe 2 in the X-axis and Z-axis directions. 2. In order to reduce the movement of the air pipe 2 in the X-axis direction, the part of the air pipe 2 parallel to the fixed plate 3 is arranged on the lower side of the fixed plate 3. In this way, when adjusting in the X-axis direction, the air pipe 2 is not easy to contact and collide with the single battery 2 in advance. The two ends of the air pipe 2 are L-shaped and extend upward (the position indicated by M in the figure) and are fixedly connected to the lower end of the extension plate 16.

[0053] The third embodiment:

[0054] The present embodiment is based on the first embodiment, and the following structure is used instead of the air pipe 1: please refer to Figures 12 to 14 The extension plates 16 are fixedly connected to the vertical sliding seats 74 near one end of the single battery 2, and the air pipe 2 is fixedly connected between the two extension plates 16. The air pipe 2 is in a U-shaped structure and surrounds the plurality of single batteries 2. The part of the air pipe 2 near the single battery 2 is provided with uniformly distributed air holes 201. The soft tube 3 is fixedly connected between the lower pipe 102 and the air pipe 2.

[0055] The fine mesh pipe 21 conveying the cold air flow is arranged between the gaps between adjacent single batteries 2, that is, in the battery pack gap. When cooling is needed, the cold air flow enters the fine mesh pipe 21 through the hose four 23 and is then dispersed and released between the adjacent single batteries 2, so that the single batteries 2 can be directly and quickly cooled. At the same time, the Z-axis direction adjustment operation can be performed, and the vertical sliding seat 74 drives the telescopic rod 22 and the fine mesh pipe 21 to move up and down synchronously. Since the cross clamping plate 20 and the fine mesh pipe 21 are in a clamped state, the cross clamping plate 20 moves up and down along the vertical sliding way 19, so that the fine mesh pipe 21 releases the cold air flow at different height regions of the battery pack gap, thereby improving the flow efficiency and distribution uniformity of the cold air flow in the battery pack gap.

[0056] Supplementary explanation: 1. The hose four 23 can adapt to the movement of the fine mesh pipe 21 in the X-axis and Z-axis directions, and 2. Through the arrangement of the telescopic rod 22 and the cross clamping plate 20, when the fixed mounting plate 3 moves in the X-axis direction, the fine mesh pipe 21 can remain prohibited and is not easy to contact and collide with the single battery 2. The specific distance is as follows: Since the cross clamping plate 20 has a clamping effect on the fine mesh pipe 21, the vertical sliding way 19 can limit the cross clamping plate 20 to move in the X-axis direction. The telescopic rod 22 has a telescopic effect, so 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 correspondingly extend and retract, so that the cross clamping plate 20 and the fine mesh pipe 21 can remain unchanged.

[0057] As shown in Figure 15 The telescopic rod 22 includes an outer tube 2201, an intermediate tube 2202 and an inner rod 2203 which are connected in an inner and outer sliding sleeve manner. The outer ends of the intermediate tube 2202 and the inner rod 2203 are fixedly connected with annular plates 2204. The inner ends of the outer tube 2201 and the intermediate tube 2202 are provided with annular grooves for sliding of the annular plates 2204. The end of the outer tube 2201 is fixedly connected with the vertical sliding seat 74. The end of the inner rod 2203 is provided with an interface for screwing with the fine mesh pipe 21. Through the above structure, the telescopic rod 22 realizes the free telescopic function. Since the annular plates 2204 can also rotate in the annular grooves, when it is needed to install and dismount the fine mesh pipe 21, the fine mesh pipe 21 is manually stabilized and then the inner rod 2203 is rotated, so that the fine mesh pipe 21 and the interface can be connected and dismounted. Then, through the dismounting between the hose four 23 and the lower pipe 102, the installation and dismounting of the fine mesh pipe 21 in the battery pack gap are realized.

[0058] In combination with the current actual needs, the above-mentioned embodiments adopted by the present application do not limit the protection scope, and various changes made within the knowledge range of those skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. A temperature control structure for an electric vehicle battery pack, comprising a pair of mounting plates (3) disposed inside a sealed box (1) and located on both sides of the battery pack, wherein the battery pack comprises a plurality of uniformly arranged single cells (2), and is characterized in that: A pair of fixed plates (3) are fixedly connected to a temperature measuring host (5) and a reflector (6) at ends away from each other, and a temperature sensing optical fiber (4) is electrically connected between the temperature measuring host (5) and the reflector (6). The temperature sensing optical fiber (4) is horizontally laid between a plurality of single cells (2). A three-axis adjustment member is connected between the fixed plates (3) and the inner wall of the sealed box (1). A cooling box (9) is provided on the outside of the sealed box (1), and a pair of hoses (10) are connected between the cooling box (9) and the sealed box (1). The three-axis adjustment member includes an air guide assembly (8) and a pair of two-axis slide rails (7), the air guide 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 plate (3), the pair of air bags (82) are respectively fixedly connected to the two ends of the fixed plate (3), and the upper ends of the air bags (82) are fixedly connected to a hose (83), and the ends of the pair of hoses (83) away from the air bags (82) are respectively fixedly connected to the air inlet end and the air outlet end of the air pump (81); A pair of two-axis slide rails (7) are respectively connected between a pair of airbags (82) and the inner wall of the sealed box (1), the two-axis slide rails (7) include a horizontal guide rail (71) fixedly connected to the inner wall of the sealed box (1), the outer end of the horizontal guide rail (71) is horizontally slidably connected to a horizontal slide seat (72), the outer end of the horizontal slide seat (72) is fixedly connected to a vertical guide rail (73), the outer end of the vertical guide rail (73) is vertically slidably connected to a vertical slide seat (74), and the vertical slide seat (74) is fixedly connected to the airbag (82); A pair of the fixing plates (3) are provided with a fiber placement groove (301) and a pair of inner grooves (302) at one end close to each other, the fiber placement groove (301) is located between the pair of inner grooves (302), the temperature-sensitive optical fiber (4) passes through the interior of the fiber placement groove (301), and its two sides are clamped and fixed by a pair of clamping plates (14), and the clamping plates (14) are fixed to the sealing box (1) by the cooperation of bolts and the inner grooves (302); The specific laying method of the temperature-sensing optical fiber (4) is as follows: one end of the temperature-sensing optical fiber (4) is passed through the through hole on the fixed plate (3) and connected to the temperature measuring host (5) to realize data transmission, and then the temperature-sensing optical fiber (4) is laid along the gap between two adjacent rows of single cells (2). After being laid to the fixed plate (3) on the other side, the temperature-sensing optical fiber (4) is bent and turned inside the fiber placement groove (301) and then enters the gap between the other row of single cells (2); When a pair of fixed plates (3) moves 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, and the temperature-measuring position of the temperature-sensing optical fiber (4) will be adjusted without changing the laying trajectory of the temperature-sensing optical fiber (4).

2. The temperature control structure of an electric vehicle battery pack according to claim 1, characterized in that: A hard rod (12) is fixedly connected between the pair of vertical slide seats (74), the airbag (82) is a closed airbag structure with a through hole in the middle, the hard rod (12) movably passes through the through hole and the fixed plate (3) and is located inside the fiber placement groove (301), the outer end of the hard rod (12) is fixedly connected to a pair of convex rings (13), the convex rings (13) are located inside the fiber placement groove (301), when the pair of airbags (82) are in an initial state with the same volume, the temperature-sensing optical fiber (4) does not contact the surface of the single battery (2), and there is a gap between the pair of convex rings (13) and the pair of inner walls of the fiber placement groove (301).

3. The temperature control structure of an electric vehicle battery pack according to claim 1, characterized in that: The side end of the sealed box body (1) is fixedly connected to an upper tube (101) and a lower tube (102) that pass through the sealed box body, and the side end of the cooling box (9) is fixedly connected to an air pump 2 (15). The air inlet end of the air pump 2 (15) is connected to one end of the heat exchange coil inside the cooling box (9), one of the hoses 2 (10) is threadedly connected between the air outlet end of the air pump 2 (15) and the lower tube (102), and the other hose 2 (10) is threadedly connected between the upper tube (101) and the cooling box (9), and is connected to the other end of the heat exchange coil.

4. The temperature control structure of an electric vehicle battery pack according to claim 3, characterized in that: The end of the lower tube (102) located inside the sealed box (1) is fixedly connected to an air pipe (11). The air pipe (11) is in a U-shaped structure surrounding the outside of the plurality of single batteries (2), and the portion of the air pipe (11) close to the single batteries (2) is provided with evenly distributed air holes (1101).

5. The temperature control structure of an electric vehicle battery pack according to claim 3, characterized in that: An extension plate (16) is fixedly connected to one end of a pair of vertical slide seats (74) close to the single battery (2), and a second air pipe (18) is fixedly connected between the pair of extension plates (16). The second air pipe (18) is in a U-shaped structure surrounding the outside of the plurality of single batteries (2), and a portion close to the single battery (2) is provided with two evenly distributed air holes (1801). A third hose (17) is connected between the lower tube (102) and the second air pipe (18).

6. The temperature control structure of an electric vehicle battery pack according to claim 3, characterized in that: A pair of the vertical sliding seats (74) are fixedly connected to one end of the single battery (2) with a telescopic rod (22), and a thin mesh tube (21) is threadedly connected between the pair of the telescopic rods (22). The thin mesh tube (21) is horizontally laid between the multiple single batteries (2) and vertically distributed on the upper side of the temperature-sensing optical fiber (4). A hose four (23) is connected between the lower tube (102) and the thin mesh tube (21).

7. The temperature control structure of an electric vehicle battery pack according to claim 6, characterized in that: A pair of inner walls of the sealing box (1) are fixedly connected to a clamping assembly for two-axis limiting the fine mesh tube (21), and the clamping assembly includes a pair of vertical slides (19) and a pair of horizontal clamps (20). The vertical slides (19) are fixedly connected to the inner walls of the sealing box (1), and the side ends of the horizontal clamps (20) are fixedly connected to a pair of T-shaped sliders (2001). The pair of T-shaped sliders (2001) are respectively slidably connected to the inside of the pair of vertical slides (19). The pair of horizontal clamps (20) are connected by fasteners and are used to clamp a part of the fine mesh tube (21). The horizontal clamps (20) are provided with a plurality of evenly distributed lock holes (2002).

8. The temperature control structure of an electric vehicle battery pack according to claim 7, characterized in that: The telescopic rod (22) comprises an outer tube (2201), an intermediate tube (2202) and an inner rod (2203) which are connected in an inner and outer sliding manner. The outer ends of the intermediate tube (2202) and the inner rod (2203) are fixedly connected to an annular plate (2204). The inner ends of the outer tube (2201) and the intermediate tube (2202) are provided with an annular groove for the annular plate (2204) to slide. The end of the outer tube (2201) is fixedly connected to the vertical sliding seat (74), and the end of the inner rod (2203) is provided with an interface for threaded connection with the fine mesh tube (21).

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