Expansion force-thermal stress synergistic suppression structure of immersed liquid-cooled lithium battery array

Abstract

The present application relates to the technical field of battery, specifically to an expansion force-thermal stress synergic inhibition structure of immersed liquid-cooled lithium battery array, comprising a support structure arranged in a battery shell for mounting an electric core module and a liquid-cooled circulation system for providing cooling for the electric core module. The support structure comprises oppositely arranged first and second support plates, and the first and second support plates are respectively provided with movable clamping plates and fixed clamping plates for clamping both sides of the electric core module. The movable clamping plates are movably connected to the first support plates through pre-tightening slide rods, and the pre-tightening slide rods are provided with pre-tightening springs for providing pre-tightening force. The liquid-cooled circulation system comprises a main cooling pipeline and at least one spray head in communication with the main cooling pipeline. The spray head is connected to the main cooling pipeline through a flexible flow channel, and the flexible flow channel can be compressed by a compression mechanism to change the flow channel cross-sectional area. The mechanical transmission mechanism is further included for converting the battery expansion displacement into the action of the compression mechanism. The present application can synergically inhibit the expansion force and thermal stress of the lithium battery array.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a structure for synergistic suppression of expansion force and thermal stress in an immersed liquid-cooled lithium battery array. Background Technology

[0002] Lithium-ion batteries are widely used due to their high energy density and long cycle life. However, heat is inevitably generated during charging and discharging, leading to temperature increases. Excessive temperatures not only accelerate battery aging and shorten lifespan but also pose a safety risk of thermal runaway. Immersion liquid cooling technology, with its advantages of uniform heat dissipation, high efficiency, and compact design, is considered an ideal solution for thermal management of next-generation high-performance batteries. This technology directly immerses the battery module in an insulating coolant, directly removing heat from the battery through convection and phase change of the liquid. Its thermal management efficiency is far superior to traditional air cooling and cold plate liquid cooling.

[0003] However, during cycling and heat generation, lithium-ion batteries, in addition to generating thermal stress, also experience volume expansion due to lithium-ion insertion into the negative electrode and gas production from side reactions, generating considerable expansion force. In traditional immersion liquid cooling systems, rigid frames and fasteners are typically used to constrain the battery array to prevent excessive battery expansion and maintain structural stability. This rigid constraint method has significant drawbacks: First, it ignores the coupling relationship between thermal stress and mechanical expansion force. Simple rigid constraints can cause the battery surface to bear huge concentrated stress, easily leading to deformation of the battery casing, damage to the internal separator under pressure, and thus accelerating battery life decay or even causing internal short circuits. Second, existing constraint structures are functionally limited and independent of the cooling system. Battery expansion is a dynamic process, but the heat dissipation power of a typical cooling system is fixed, unable to provide stronger heat dissipation capabilities during the expansion and heat generation phase when the battery most needs heat dissipation. Summary of the Invention

[0004] The purpose of this invention is to provide a structure for synergistic suppression of expansion force and thermal stress in an immersed liquid-cooled lithium battery array, so as to synergistically suppress the expansion force and thermal stress of the lithium battery array and solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an expansion force-thermal stress synergistic suppression structure for an immersed liquid-cooled lithium battery array, including a support structure disposed inside the battery casing for installing the cell module and a liquid cooling circulation system for cooling the cell module.

[0006] The support structure includes a first support plate and a second support plate arranged opposite to each other. The first support plate and the second support plate are respectively provided with a movable clamping plate and a fixed clamping plate for clamping the two sides of the battery cell module. The movable clamping plate is movably connected to the first support plate through a pre-tightening slide rod, and a pre-tightening spring is provided on the pre-tightening slide rod to provide pre-tightening force.

[0007] The liquid cooling circulation system includes a main cooling pipe and at least one nozzle connected to the main cooling pipe. The nozzle is connected to the main cooling pipe through a flexible flow channel, which can be compressed by a squeezing mechanism to change its flow channel cross-sectional area.

[0008] It also includes a mechanical transmission mechanism that converts the battery expansion displacement into the action of the extrusion mechanism. The input end of the mechanical transmission mechanism is connected to the movable clamping plate, and its output end is connected to the extrusion mechanism.

[0009] When the battery cell module expands and pushes the movable clamping plate to move, the mechanical transmission mechanism transmits the displacement of the movable clamping plate and drives the extrusion mechanism to compress the flexible flow channel, thereby increasing the flow rate of the coolant at the nozzle and enhancing the turbulence effect.

[0010] Preferably, the second support plate is movably mounted on the base via an adjustable mounting structure. The adjustable mounting structure includes a positioning screw mounted on the base and a mounting seat mounted on the second support plate. The mounting seat has a straight groove, through which the positioning screw passes and is locked in place by a clamping nut.

[0011] Preferably, the pre-tightening slide bar includes a guide rod fixed to the movable clamping plate, the guide rod passes through the first support plate, and an end block is connected to its end. A pre-tightening spring is sleeved on the guide rod and connected between the end block and the first support plate.

[0012] Preferably, both the movable clamping plate and the fixed clamping plate have a rubber surface layer on their clamping surfaces.

[0013] Preferably, the mechanical transmission mechanism includes a push rod connected to the movable clamping plate, an inclined push block connected to the push rod, a rotating rod that engages with the inclined surface of the inclined push block, a lever that is rotatably connected to the rotating rod, and a pull-down rope connected to the long arm end of the lever, the other end of which is connected to the extrusion mechanism.

[0014] Preferably, the extrusion mechanism includes a horizontally arranged control rod and a compression frame fixed to the control rod, with the other end of the pull-down rope connected to the control rod.

[0015] Preferably, the flexible flow channel is a rubber tube, and the compression frame can surround and compress the rubber tube under the action of the control rod.

[0016] Preferably, the nozzle is fixed to the base plate, and the compression frame is slidably installed on the limiting groove of the base plate.

[0017] Preferably, the rubber hoses of multiple nozzles are all connected to a horizontally arranged dispersion tube, which is connected to the main cooling pipeline through a connector tube.

[0018] Preferably, the main cooling pipeline includes an inlet pipe and a return pipe laid on the bottom surface of the battery casing, with an outlet and a return port respectively provided on the inlet pipe and the return pipe.

[0019] Preferably, the liquid cooling circulation system also includes a control box located outside the battery casing. The control box has an inlet port and an outlet port, an internal control valve, and is connected to an external liquid cooling water tank through pipes to form a circulation loop.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The synergistic suppression structure of the present invention can transform the harmful expansion force generated during battery operation into a beneficial driving source. By using a lever amplification mechanism, the minute expansion displacement is converted into an effective squeezing action on the cooling channel. Thus, without the need for external energy input and electronic control, the instantaneous increase in local coolant flow rate and volume is automatically achieved, significantly enhancing the directional heat dissipation efficiency of the high-temperature area of ​​the battery.

[0022] 2. In addition to suppressing thermal stress through liquid cooling immersion and suppressing expansion force through a double-clamp structure, this invention can also form a complete passive negative feedback loop mechanism. Battery expansion automatically triggers stronger heat dissipation, and the enhanced heat dissipation effectively suppresses further expansion and temperature rise of the battery, thus achieving synergistic suppression and benign interaction between expansion force and thermal stress.

[0023] 3. The synergistic suppression structure of the present invention provides necessary buffer space for battery expansion through the cooperation of pre-tightening springs and movable clamps, avoiding stress concentration and potential damage risks on the battery surface caused by rigid constraints. At the same time, it ensures continuous and good thermal contact between the battery and the cooling structure. Furthermore, the entire synergistic suppression structure is based on a mechanical structure and does not rely on electronic components such as sensors and controllers, which has higher environmental adaptability, reliability and durability. It is particularly suitable for application scenarios with large vibrations and drastic temperature changes, effectively improving the overall safety and service life of the battery system.

[0024] 4. This invention, by setting up an adaptive adjustment mechanism composed of components such as an adjustment plate, positioning sleeve, center rod, and striking box, can automatically adjust the initial gap between the movable clamping plate and the fixed clamping plate through a mechanical triggering mechanism when the battery cell module undergoes permanent expansion due to long-term use. This avoids excessive pressure on the aging battery cell and prevents damage. This adjustment process is linked with the main cooperative suppression mechanism and is triggered only after the expansion accumulates to a certain extent. This ensures that the system provides just the right amount of constraint force and heat dissipation enhancement throughout the battery cell's life cycle, further improving the safety and reliability of the entire battery system throughout its entire life cycle. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the location of the synergistic suppression structure of the present invention within the battery casing.

[0026] Figure 2 This is a schematic diagram of the array-type cooperative suppression structure of the present invention.

[0027] Figure 3 This is a schematic diagram of the connection of a single synergistic inhibition structure of the present invention.

[0028] Figure 4 This is a schematic diagram of a single synergistic inhibition structure of the present invention.

[0029] Figure 5 This is a schematic diagram of the first support plate structure of the present invention.

[0030] Figure 6 This is a schematic diagram of the connection positions of the nozzle structure of the present invention.

[0031] Figure 7 This is a schematic diagram of the nozzle structure of the present invention.

[0032] Figure 8 This is a schematic diagram of the compression frame structure of the present invention.

[0033] Figure 9 This is a schematic diagram of the movable clamping plate structure of the present invention.

[0034] Figure 10 This is a schematic diagram of the connection of the lever and control rod structure of the present invention.

[0035] Figure 11 This is a schematic diagram of the lever in the downward state of the present invention.

[0036] Figure 12 This is a schematic diagram of the second support plate mounting structure of the present invention.

[0037] Figure 13 This is a schematic diagram showing the installation position of the adjustment plate structure of the present invention.

[0038] Figure 14 This is a schematic diagram of the adjustment plate and striking box structure of the present invention.

[0039] Figure 15 This is a schematic diagram of the stopper rod structure of the present invention.

[0040] Figure 16 This is a schematic diagram of the internal structure of the striking box of the present invention.

[0041] In the diagram: 1. Battery casing; 2. Control box; 3. Water inlet port; 4. Water outlet port; 5. Water inlet pipe; 6. Return pipe; 7. Water outlet; 8. Return port; 9. Water supply interface; 10. Base; 11. Mounting hole; 12. First support plate; 13. Second support plate; 14. Pre-tightening slide bar; 15. Movable clamping plate; 16. Fixed clamping plate; 17. Nozzle; 18. Rubber hose; 19. Dispersion pipe; 20. Connector pipe; 21. Base plate; 22. Compression frame; 23. Control rod; 24. Push rod; 5. Inclined push block; 26. Lever; 27. Rotating rod; 28. Pull-down rope; 29. ​​Positioning screw; 30. Mounting base; 31. Straight groove; 32. Compression nut; 33. Adjusting plate; 34. Fork rod; 35. Positioning sleeve; 36. Snap ring; 37. Center rod; 38. Snap ring; 39. Slide rod; 40. Slider; 41. Stopper rod; 42. Knocking box; 43. Movable block; 44. Storage spring; 45. Knocking rod; 46. Spring pin; 47. Unlocking rope; 48. Base rod; 49. Reset magnetic base. Detailed Implementation

[0042] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] Please see Figures 1 to 16 The present invention provides a technical solution: an expansion force-thermal stress synergistic suppression structure for an immersed liquid-cooled lithium battery array. This structure is assembled in an immersed liquid-cooled battery case 1 for supporting the installation of the lithium battery cell array, and at the same time plays a synergistic suppression role of expansion force-thermal stress.

[0044] The synergistic suppression structure first includes a thermal stress suppression structure, which comprises a control box 2 mounted on the outer wall of the battery casing 1 by screws. The control box 2 has a water inlet port 3 and a water outlet port 4, both of which are connected to a liquid cooling water tank via pipes. The control box 2 also houses two control valves, which are connected to the water inlet port 3 and the water outlet port 4 respectively. The two control valves are also sealed with a water inlet pipe 5 and a return pipe 6. The main pipelines of the water inlet pipe 5 and the return pipe 6 are laid on the bottom surface of the battery casing 1. On both sides of the battery casing 1, the inlet pipe 5 and the return pipe 6 are respectively provided with outlets 7 and return ports 8 at equal intervals. After the coolant is delivered into the inlet pipe 5, the coolant can be injected into the battery casing 1 through the multiple outlets 7 to perform immersion liquid cooling of the cell module and continuously supply coolant. At the same time, the coolant can enter the return pipe 6 from the return port 8 and finally return to the liquid cooling tank, forming a cycle to effectively control the temperature inside the battery and thus suppress the thermal stress generated by the heat of the cell structure.

[0045] The collaborative suppression structure also includes an expansion force suppression structure installed inside the battery casing 1. This expansion force suppression structure mainly includes a first support plate 12 and a second support plate 13 for double-sided support of the cell module. The first support plate 12 is welded and fixed to the base 10, while the second support plate 13 is movably and adjustablely mounted on the base 10. The base 10 has mounting holes 11, which can be connected to a pre-set slot inside the battery casing 1 through the mounting holes 11, so that the first support plate 12 and the second support plate 13 can be installed in the battery casing 1, and the cell module can be inserted into the gap between them.

[0046] Furthermore, the first support plate 12 and the second support plate 13 are respectively provided with a movable clamping plate 15 and a fixed clamping plate 16. Both clamping plates have a rubber surface layer. After the battery cell module is assembled, it is located between the two clamping plates. The two clamping plates press on both sides of the battery cell module to provide a suppressive force and suppress the expansion force generated by the battery cell module due to heat generation and aging.

[0047] The rubber surface layer is made of silicone rubber, with a thickness of 2mm and a Shore hardness of 50±5HA.

[0048] The movable clamping plate 15 is movably mounted on the first support plate 12 via a pre-tightening slide rod 14, which can generate varying suppressive force. The pre-tightening slide rod 14 includes guide rods fixed to the four corners of the movable clamping plate 15 by welding. The guide rods pass through the first support plate 12. The end of the guide rod away from the movable clamping plate 15 is connected to an end block by a thread. A pre-tightening spring is connected between the end block and the first support plate 12. The two ends of the pre-tightening spring are fixed by pins. The elastic force of the pre-tightening spring provides a dynamically varying expansion suppressive force for the movable clamping plate 15. In conjunction with the rubber surface layer, it avoids rigid compression and damage to the battery cell.

[0049] On the other side of the cell module is a fixing plate 16, which is fixed to the surface of the second support plate 13 by screws. Therefore, the second support plate 13 and the fixing plate 16 mainly serve as positioning and blocking. The movable clamp 15 on the first support plate 12 provides expansion space for the cell module to avoid cell breakage caused by rigid connection. Accordingly, the cell module is assembled in a non-completely fixed manner during installation, and the connection between them retains a certain degree of redundancy.

[0050] As an embodiment of the present invention, a collaborative control mechanism is provided between the expansion force suppression structure and the thermal stress suppression structure. The water outlet 7 is usually located between the two support plates, at the bottom of the battery cell module. A water supply interface 9 is also provided in the gap of the water outlet 7, which has a threaded sealing head. The water supply interface 9 is located outside the first support plate 12.

[0051] The collaborative control mechanism also includes nozzles 17 arranged on the first support plate 12. The nozzles 17 are located on the upper part of the first support plate 12, and the water outlet 7 of the nozzles 17 faces the battery cell module. Rubber tubes 18 are sealed to the nozzles 17. Each rubber tube 18 is sealed to a dispersion tube 19. The dispersion tube 19 is horizontally arranged and connected to a vertical connector tube 20. The bottom of the connector tube 20 is provided with an external thread. The connector tube 20 can be assembled on the water supply interface 9. Water is supplied to the connector tube 20, dispersion tube 19, rubber tubes 18 and nozzles 17 through the water inlet pipe 5. The nozzles 17 further generate turbulence from the top of the battery cell module, accelerate heat exchange at the battery cell module and further suppress the generation of thermal stress.

[0052] A diversion valve can be further installed on the inlet pipe 5 to divide the coolant into two paths. One path is injected into the battery casing 1 through the outlet 7 to maintain the immersion level; the other path is delivered to the distribution pipe 19 through the connector pipe 20 to supply water to the nozzle 17. The opening of the diversion valve can be adjusted according to the liquid level in the battery casing to ensure the balance between immersion and nozzle water supply.

[0053] The rubber tube 18 is made of fluororubber, with an inner diameter of 10mm and a temperature resistance range of -40℃ to 150℃.

[0054] Thermal stress typically increases with rising cell temperature. At the same time, rising temperature also causes cell expansion to become more severe. Therefore, both can be mitigated by reducing the cell module temperature.

[0055] When the battery cell module expands due to increased heat, it can be suppressed by the expansion of the movable clamping plate 15. At the same time, the movable clamping plate 15 is pushed further to overcome the elastic force of the pre-tightening spring. The present invention improves the turbulence effect generated by the nozzle 17 by moving the movable clamping plate 15, thereby accelerating the cooling of the battery cell module and achieving the effect of suppressing thermal stress.

[0056] A base plate 21 is fixed to the nozzle 17 by welding. The base plate 21 is located below the rubber tube 18. At the same time, a compression frame 22 is slidably installed on the base plate 21 through a limiting groove. The compression frame 22 can surround the rubber tube 18. When the compression frame 22 moves down close to the base plate 21, it can perform local compression of the rubber tube 18, which temporarily reduces the cross-sectional area of ​​the flow channel of the rubber tube 18. This causes the coolant to flow faster and the flow rate to increase instantaneously when it flows through the compressed section, thereby enhancing the turbulence effect at the nozzle 17.

[0057] The compression frame 22 is fixed to a horizontal control rod 23 by screws. Meanwhile, a push rod 24 is welded to the back of the movable clamping plate 15. An inclined push block 25 is installed on the push rod 24 via a threaded connection. The push rod 24 passes through the first support plate 12. The inclined push block 25 is positioned with its inclined surface facing upwards. A lever 26 is installed on the outer wall of the first support plate 12 via a bearing seat. A rotating rod 27 is rotatably installed at the short arm end of the lever 26 via a shaft hole. The rotating rod 27 is connected to the inclined push block 25. The inclined surface of block 25 is connected to the lever 26. The long arm end of lever 26 is provided with a pull-down rope 28. The other end of pull-down rope 28 is connected to control rod 23. Therefore, when the cell module expands and causes the movable clamping plate 15 to move, push rod 24 can drive inclined push block 25 to move outward. The inclined surface pushes the rotating rod 27 upward, causing lever 26 to rotate, which amplifies the displacement. The long arm end of lever 26 pulls down control rod 23 through pull-down rope 28, and the compression frame 22 is used to compress rubber tube 18.

[0058] The pull-down rope 28 is made of aramid fiber rope with a diameter of 2mm and a breaking strength of ≥500N.

[0059] Therefore, on the one hand, the expansion of the battery cell module is suppressed by the resistance of the deformation of the rubber tube 18, and on the other hand, the thermal stress of the battery cell module is suppressed by the enhanced turbulence effect of the nozzle 17, achieving the effect of synergistic suppression.

[0060] The second support plate 13 of the present invention adopts an adjustable mounting structure. According to the initial state of the battery cell module, the gap between the second support plate 13 and the first support plate 12 can be adjusted within a small range. The bottom surface of the base 10 is provided with a positioning screw 29 by welding. The second support plate 13 is fixedly mounted with a mounting seat 30 by bolts. The mounting seat 30 can be inserted into the base 10, and the mounting seat 30 is provided with a straight groove 31. The mounting seat 30 can be moved and adjusted by fitting the positioning screw 29 through the straight groove 31. After adjustment, the second support plate 13 is completely fixed on the base 10 by the tight connection between the clamping nut 32 and the positioning screw 29. The first support plate 12 and the second support plate 13 constitute the support and limiting structure of the battery cell module.

[0061] In use, the above structure works as follows: First, the battery cell module is installed between the first support plate 12 and the second support plate 13, and initially clamped by the movable clamping plate 15 and the fixed clamping plate 16. Coolant is introduced into the system for basic immersion liquid cooling circulation. When the battery cell module charges and discharges, it generates heat and expands in volume, and its expansion force mainly acts on the movable clamping plate 15. The movable clamping plate 15 moves outward against the elastic force of the preload spring, pushing the push rod 24 and the inclined push block 25 connected to it to move outward together. The inclined surface of the inclined push block 25 contacts the rotating rod 27 at the short arm end of the lever 26, converting the horizontal outward pushing force into a vertical upward pushing force, driving the lever 26 to rotate around the shaft seat. According to the principle of the lever 26, the long arm end of the lever 26 generates an amplified displacement, which pulls the control rod 23 downward through the pull rope 28. The control rod 23 drives the compression frame 22 to press down, causing local compression of the rubber tube 18, and instantly reducing its flow channel cross-sectional area. According to fluid mechanics principles, this causes a sharp increase in the velocity and instantaneous increase in the flow rate of the coolant flowing through this area. The high-pressure, high-speed coolant is ultimately sprayed from nozzle 17 into the high-temperature zone at the top of the battery cell module with stronger turbulence, greatly enhancing the heat exchange efficiency in this area and thus accelerating the cooling of the battery cell module. After the temperature decreases, the thermal expansion tendency of the battery cell weakens, and the expansion force decreases. The preload spring pushes the movable clamp 15 to reset, which in turn causes the compression frame 22 to move upward through the lever 26 mechanism, relieving the compression on the rubber tube 18. The turbulence effect of nozzle 17 returns to normal, thus forming a virtuous cycle of synergistic suppression.

[0062] In another embodiment of the present invention, the position of the pre-tightening slide bar 14 is set to an adjustable structure, thereby changing the position of the movable clamping plate 15. When the battery cell module undergoes permanent expansion due to aging, the gap between the movable clamping plate 15 and the fixed clamping plate 16 can be increased to avoid damaging the battery cell module.

[0063] An adjusting plate 33 is movably installed on the side wall of the first support plate 12. The two ends of the adjusting plate 33 are integrally formed with fork rods 34. The fork rods 34 are slidably connected to the guide rods of the pre-tightening slide rods 14, thereby installing the adjusting plate 33 between the two pre-tightening slide rods 14. The pre-tightening springs of the pre-tightening slide rods 14 are fixedly connected to the fork rods 34 by pins. Therefore, the position of the movable clamping plate 15 can be controlled by moving the adjusting plate 33.

[0064] The adjusting plate 33 has a protrusion in the middle, thus forming a gap between the adjusting plate 33 and the first support plate 12. A wedge is provided in this gap and welded to the adjusting plate 33. By squeezing the wedge, the adjusting plate 33 is pushed to change position. At the same time, a tubular positioning sleeve 35 is vertically welded and installed on the adjusting plate 33. A retaining ring 36 is arranged on the inner wall of the positioning sleeve 35. A center rod 37 is welded and installed on the first support plate 12. A retaining ring 38 is provided on the center rod 37. The center rod 37 passes through the positioning sleeve 35. The position of the adjusting plate 33 can be fixed by the mutual engagement of the retaining ring 38 and the retaining ring 36. Both the retaining ring 36 and the retaining ring 38 have a certain deformation capacity. Therefore, when the adjusting plate 33 is subjected to a sufficiently large instantaneous thrust, the positioning sleeve 35 can move along the direction of the center rod 37 and be fixed again after the adjusting plate 33 moves.

[0065] A vertical slide bar 39 is provided on the side of the adjusting plate 33. The slide bar 39 is fixed to the first support plate 12 by screws. A slider 40 is slidably sleeved on the slide bar 39. A stopper rod 41 is integrally formed on the slider 40. The stopper rod 41 is located in the gap of the adjusting plate 33. When the stopper rod 41 is subjected to force and squeezes the wedge, the adjusting plate 33 can be pushed.

[0066] Furthermore, a striking box 42 is also provided on the side of the adjusting plate 33. The striking box 42 is fixed to the first support plate 12 by screws. At the same time, the striking box 42 is located above the slider 40. A movable block 43 is installed in the striking box 42 for limiting. A storage spring 44 is fixedly connected to the movable block 43. The other end of the storage spring 44 is connected to the top of the striking box 42. A striking rod 45 is welded and fixedly installed at the bottom of the movable block 43. The movable block 43 can accumulate elastic potential energy through the storage spring 44. When the elastic potential energy is released, the movable block 43 can drive the striking rod 45 to move, generate an impact force on the slider 40, drive the stopper rod 41 to push the wedge block, and change the position of the adjusting plate 33. By controlling the specifications of the storage spring 44, it is ensured that the generated impact force can move the adjusting plate 33 by 1-2 rings 36.

[0067] When the movable block 43 is moved to the middle of the striking box 42, it can compress the storage spring 44 to generate elastic potential energy. A spring pin 46 is movably mounted in the middle of the striking box 42. The front end of the spring pin 46 has a downward-facing bevel, and the tail end of the spring pin 46 is attached to an unlocking rope 47. The other end of the unlocking rope 47 is attached to a base rod 48, which is fixedly mounted on the control rod 23 with screws. Therefore, when the battery cell module expands due to localized overheating, the push rod 24 can move to compress the nozzle 17, thereby enhancing heat dissipation. Simultaneously, if the expansion... The expansion causes the control lever 23 to move to its maximum position, which pulls the unlocking rope 47, causing the spring pin 46 to unlock. This causes the striking lever 45 to impact the slider 40, and the stopper lever 41 changes the position of the primary adjustment plate 33. Therefore, after the battery cell module has been used for a long time, if the expansion has occurred many times and the aging is severe, the gap between the movable clamping plate 15 and the fixed clamping plate 16 will increase to avoid damage to the battery cell module. Correspondingly, as the movable clamping plate 15 moves, the push rod 24 will also move, so that the rubber tube 18 is in a compressed state to enhance the turbulence and heat dissipation effect.

[0068] Furthermore, a reset magnetic base 49 is installed on the top of the striking box 42 by screws, which is equipped with an electromagnet. The movable block 43 is provided with a ferromagnetic structure. The electromagnet can generate magnetic force to re-attract and reset the movable block 43 to the center. The spring pin 46 is used to re-limit the position to ensure that the striking rod 45 has a repeated striking effect.

[0069] The unlocking rope 47 and the pull-down rope 28 are made of the same material and have the same specifications.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure for synergistic suppression of expansion force and thermal stress in an immersed liquid-cooled lithium battery array, comprising a support structure disposed within the battery casing for mounting the cell module, and a liquid-cooling circulation system for providing cooling to the cell module, characterized in that: The support structure includes a first support plate and a second support plate arranged opposite to each other. The first support plate is provided with a movable clamping plate, and the second support plate is provided with a fixed clamping plate. The movable clamping plate and the fixed clamping plate are used to clamp the two sides of the battery cell module. The movable clamping plate is movably connected to the first support plate through a pre-tightening slide rod, and a pre-tightening spring is provided on the pre-tightening slide rod to provide pre-tightening force. The pre-tightening slide bar includes a guide rod fixed to the movable clamping plate. The guide rod passes through the first support plate and has an end block connected to its end. The pre-tightening spring is sleeved on the guide rod and connected between the end block and the first support plate. The liquid cooling circulation system includes a main cooling pipe and at least one nozzle connected to the main cooling pipe. The nozzle is connected to the main cooling pipe through a flexible flow channel, which can be compressed by a squeezing mechanism to change its flow channel cross-sectional area. It also includes a mechanical transmission mechanism that converts the battery expansion displacement into the action of the extrusion mechanism. The input end of the mechanical transmission mechanism is connected to the movable clamping plate, and its output end is connected to the extrusion mechanism. When the battery cell module expands and pushes the movable clamping plate to move, the mechanical transmission mechanism transmits the displacement of the movable clamping plate and drives the extrusion mechanism to compress the flexible flow channel, thereby increasing the flow rate of the coolant at the nozzle and enhancing the turbulence effect. The mechanical transmission mechanism includes a push rod connected to the movable clamping plate, an inclined push block connected to the push rod, a rotating rod that cooperates with the inclined surface of the inclined push block, a lever that is rotatably connected to the rotating rod, and a pull-down rope connected to the long arm end of the lever. The other end of the pull-down rope is connected to the extrusion mechanism.

2. The expansion force-thermal stress synergistic suppression structure of the immersion liquid-cooled lithium battery array according to claim 1, characterized in that: The second support plate is movably mounted on the base via an adjustable mounting structure. The adjustable mounting structure includes a positioning screw mounted on the base and a mounting seat mounted on the second support plate. The mounting seat has a straight groove, and the positioning screw passes through the straight groove and is locked in place by a clamping nut.

3. The expansion force-thermal stress synergistic suppression structure of the immersion liquid-cooled lithium battery array according to claim 1, characterized in that: Both the movable clamping plate and the fixed clamping plate have rubber surfaces on their clamping surfaces.

4. The expansion force-thermal stress synergistic suppression structure of the immersion liquid-cooled lithium battery array according to claim 1, characterized in that: The extrusion mechanism includes a horizontally arranged control rod and a compression frame fixed to the control rod, and the other end of the pull-down rope is connected to the control rod.

5. The expansion force-thermal stress synergistic suppression structure of the immersion liquid-cooled lithium battery array according to claim 4, characterized in that: The flexible flow channel is a rubber tube, and the compression frame can surround and compress the rubber tube under the action of the control rod.

6. The expansion force-thermal stress synergistic suppression structure of the immersion liquid-cooled lithium battery array according to claim 5, characterized in that: The nozzle is fixed to the base plate, and the compression frame is slidably installed on the limiting groove of the base plate.

7. The expansion force-thermal stress synergistic suppression structure of the immersion liquid-cooled lithium battery array according to claim 6, characterized in that: The rubber tubes of the multiple nozzles are all connected to a horizontally arranged dispersion tube, which is connected to the main cooling pipeline through a connector tube.

8. The expansion force-thermal stress synergistic suppression structure of the immersion liquid-cooled lithium battery array according to claim 1, characterized in that: The main cooling pipeline includes an inlet pipe and a return pipe laid on the bottom surface of the battery casing, and the inlet pipe and the return pipe are respectively provided with an outlet and a return port.

9. The expansion force-thermal stress synergistic suppression structure of the immersion liquid-cooled lithium battery array according to claim 8, characterized in that: The liquid cooling circulation system also includes a control box located outside the battery casing. The control box has an inlet port and an outlet port, an internal control valve, and is connected to an external liquid cooling water tank through pipes to form a circulation loop.

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