Photovoltaic energy storage lithium battery pack

Abstract

The present application relates to the technical field of lithium battery, and particularly relates to a photovoltaic energy storage lithium battery pack, which comprises a fixed box main body, a fixed table is slidably connected in the fixed box main body, a plurality of groups of lithium batteries are arranged on the top of the fixed table, a connecting assembly is arranged between the plurality of groups of lithium batteries, and a cooling assembly is arranged at the rear end in the fixed box main body. Compared with the existing lithium battery pack, a plurality of industry pain points are comprehensively solved through structural innovation and system integration. In terms of connection and maintenance, the problems of traditional bolt or welding disassembly and assembly, easy loosening and heating, and high wiring error rate are solved. In terms of heat dissipation and temperature control, the problems of insufficient single heat dissipation efficiency, large temperature difference of the battery cell, high energy consumption and poor low-temperature adaptability are solved. In terms of anti-shock safety, the problems of poor traditional buffer energy absorption effect, easy displacement of the battery, short circuit, and weak load adaptability are solved. Through the cooperative work of multiple assemblies, the overall practicability of the system is greatly improved, and the system is suitable for a variety of photovoltaic energy storage application scenarios.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and more specifically to a photovoltaic energy storage lithium battery pack. Background Technology

[0002] With the acceleration of the global energy transition, distributed photovoltaic (PV) power generation systems have been widely applied and promoted due to their advantages of being clean and environmentally friendly, generating power locally, and consuming power locally. Lithium-ion battery packs, as the core energy storage component of distributed PV systems, play a crucial role in storing PV energy, mitigating grid fluctuations, and ensuring power supply continuity. Their performance directly determines the operating efficiency, safety, and lifespan of the entire PV energy storage system.

[0003] Currently, photovoltaic energy storage lithium battery packs on the market still have many technical shortcomings in practical applications. Regarding battery connections, traditional lithium battery cells are mostly fixed with bolts or welded together. This not only makes assembly and disassembly cumbersome, requiring specialized tools and resulting in low maintenance efficiency, but also easily leads to loose connections and increased contact resistance under long-term vibration and impact environments. This can cause overheating and arcing at the contact points, and even lead to safety accidents. Furthermore, the separation of mechanical and electrical connections increases the risk of wiring errors and raises labor costs.

[0004] In terms of heat dissipation and cooling, most existing lithium battery packs use a single natural air cooling or simple forced air cooling method, which has limited heat dissipation efficiency and is unable to effectively remove the large amount of heat generated during battery charging and discharging. This results in uneven temperature distribution inside the battery pack and large temperature differences between cells. This not only accelerates battery capacity decay and shortens battery cycle life, but can also lead to battery thermal runaway in severe cases. Some systems that use liquid cooling have improved heat dissipation efficiency, but they lack a hot air recovery and reuse mechanism, resulting in higher system energy consumption and the inability to achieve wide-range temperature regulation, making it difficult to ensure normal charge and discharge performance of the battery in low-temperature environments.

[0005] In terms of shock absorption, traditional lithium battery packs typically only use simple rubber pads or springs at the bottom for cushioning, resulting in poor energy absorption and an inability to effectively absorb vibration and impact energy generated during transportation, installation, and outdoor operation. When subjected to strong vibrations or drops, this can easily lead to displacement or detachment of individual battery cells, or even electrical short circuits, posing significant safety hazards. Furthermore, most existing cushioning structures lack adaptive load capacity, making it difficult to adapt to battery packs of different capacities and weights. Therefore, improving existing lithium battery packs and designing a novel photovoltaic energy storage lithium battery pack to address these technical shortcomings and enhance the overall practicality of lithium battery packs is of paramount importance. Summary of the Invention

[0006] The purpose of this invention is to provide a photovoltaic energy storage lithium battery pack that comprehensively solves multiple industry pain points through structural innovation and system integration. In terms of connection and maintenance, it solves the problems of cumbersome disassembly and assembly, easy loosening and overheating, and high wiring error rates associated with traditional bolt or welding methods. Regarding heat dissipation and temperature control, it addresses the issues of insufficient efficiency of single heat dissipation devices, large temperature differences between cells, high energy consumption, and poor low-temperature adaptability. In terms of shock resistance and safety, it overcomes the problems of poor energy absorption effect of traditional buffer systems, easy battery displacement and short circuits, and weak load adaptability. It also solves the problems of high operating noise and easy expansion and deformation of the battery casing. Through the collaborative work of multiple components, it significantly improves the overall practicality of the system and adapts to various photovoltaic energy storage application scenarios.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A photovoltaic energy storage lithium battery pack includes a fixed box body, a fixed platform slidably connected inside the fixed box body, multiple sets of lithium batteries on the top of the fixed platform, a connecting component between each set of lithium batteries, a cooling component at the rear end inside the fixed box body, and a buffer component at the bottom end inside the fixed box body.

[0009] The connecting assembly is used to assemble two sets of lithium batteries. The connecting assembly includes a connecting plate fixedly connected to the outside of the lithium battery. Guide strips are fixedly connected to both ends of the connecting plate. Multiple sets of connecting blocks are fixedly connected to the outside of the guide strips. First limiting blocks are slidably connected to both sides of the connecting blocks. The connecting assembly also includes a fixing plate fixedly connected to the side of the lithium battery away from the connecting plate.

[0010] The cooling assembly is used to dissipate heat from the lithium battery. The cooling assembly includes a connecting shell fixedly connected to the rear end of the main body of the fixed box. Multiple sets of guide fans are fixedly connected to the top of the connecting shell. A first guide bucket is fixedly connected to the bottom of the connecting shell. A conveying pipe is fixedly connected to the rear end of the first guide bucket. A second guide bucket is fixedly connected to the top of the conveying pipe.

[0011] The buffer assembly is used to protect the lithium battery.

[0012] As a preferred embodiment of the present invention, the first limiting block extends into the interior of the connecting block and is fixedly connected to a first compression spring. Both ends of the fixing plate are provided with connecting grooves, the guide strip is inserted into the interior of the connecting grooves, a locking strip is fixedly connected to the middle of the connecting plate, a locking groove is provided in the middle of the fixing plate, and the locking strip is inserted into the interior of the locking groove.

[0013] As a preferred embodiment of the present invention, multiple sets of limiting grooves are formed at both ends of the connecting groove, and a second limiting block is slidably connected to both ends of the limiting groove. A second compression spring is fixedly connected to the second limiting block extending into the limiting groove, and a third compression spring is fixedly connected to the connecting block extending into the guide strip.

[0014] As a preferred embodiment of the present invention, a circulation pipe is fixedly connected inside the connecting shell, and multiple sets of conductive plates are fixedly connected to the outside of the circulation pipe. A water storage tank is fixedly connected to one end inside the connecting shell, and a water pump is fixedly connected to the outside of the water storage tank. The two ends of the circulation pipe are fixedly connected to the water pump and the water storage tank, respectively.

[0015] As a preferred embodiment of the present invention, a semiconductor cooling chip is fixedly connected inside the water storage tank, a heat sink is fixedly connected to the outside of the semiconductor cooling chip, an air pump is fixedly connected to the outside of the delivery pipe, the first guide bucket is located at the bottom of the fixed tank body, and the second guide bucket is located at the top of the fixed tank body.

[0016] As a preferred embodiment of the present invention, the buffer assembly includes a fixed frame fixedly connected to the middle of the bottom of the fixed platform, and a first guide rack fixedly connected to both ends of the fixed frame. A drive gear is meshed with the outer side of the first guide rack, and a second guide rack is meshed with the side of the drive gear away from the first guide rack.

[0017] In a preferred embodiment of the present invention, the drive gear is rotatably connected to the fixed box body, a movable frame is fixedly connected to the outer side of the second guide rack, the movable frame is slidably connected to the fixed box body, and a first damping spring is fixedly connected to the inner side of the movable frame, the first damping spring being fixedly connected to the fixed box body.

[0018] As a preferred embodiment of the present invention, connecting rods are fixedly connected to all four sides of the bottom of the fixed platform. The connecting rods are slidably connected to the main body of the fixed box. A second damping spring is fixedly connected to the bottom of the connecting rods. The second damping spring is fixedly connected to the main body of the fixed box.

[0019] As a preferred embodiment of the present invention, the inner wall of the fixed box body is fixedly connected with sound insulation cotton, the sound insulation cotton has multiple sets of sound absorption grooves inside, the sound absorption grooves have sound silencing grooves inside, the sound silencing grooves have multiple sets of sound silencing holes inside, the fixed box body has a cavity inside and outside the sound insulation cotton, and multiple sets of connecting cylinders are fixedly connected inside the cavity, the connecting cylinders have a hollow structure design.

[0020] As a preferred embodiment of the present invention, the lithium battery is internally fixedly connected to multiple sets of reinforcing rods, and the inner side of each reinforcing rod is fixedly connected to two sets of supporting rods, with the reinforcing rods and the two sets of supporting rods forming a triangular structure.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. In this invention, through the design of the connecting components, a guide plug-in spring automatic locking structure is adopted, which can complete the mechanical fixing and electrical conduction of adjacent lithium batteries without any auxiliary tools, only by horizontal pushing. This completely solves the problem of cumbersome disassembly and assembly and time-consuming maintenance of traditional bolt fixing.

[0023] The reliability of the multi-level interlocking anti-loosening connection is significantly improved. The four-level locking mechanism, which includes locking bar locking groove for initial positioning, guide bar connecting groove for guiding and limiting, connecting block limiting groove for depth engagement, double limiting block compression spring for automatic compensation, can maintain a firm connection even under long-term vibration and impact environment, avoiding heat generation, arcing and power loss caused by poor contact.

[0024] The integrated mechanical and electrical design has a high degree of integration, combining the mechanical connection structure with the electrical conductive terminals into one unit. The electrical connection is automatically completed when the terminals are plugged in, eliminating the need for additional wiring operations, reducing wiring errors and labor costs, and improving system integration.

[0025] The standardized and modular design ensures strong compatibility. The connection components adopt a unified standard interface, making them compatible with lithium batteries of different capacities and batches. It supports flexible series and parallel combinations, facilitating system expansion and tiered utilization.

[0026] 2. In this invention, through the design of the cooling components, a closed-loop heat dissipation mode of liquid cooling pre-cooling air forced air cooling heat dissipation and hot air recovery and re-cooling is first created. The semiconductor cooling chip first cools the coolant, and then the cooling air is blown evenly to the battery surface through the circulation pipe and conduction plate pre-cooling air guide fan. Finally, the hot air is recovered for secondary cooling, which can support high-rate continuous charging and discharging.

[0027] Excellent temperature uniformity extends battery life. Cold air is blown out evenly from the front of the battery pack and hot air is collected from the top to form a uniform airflow field. Combined with the serpentine circulation tube and high-density conductive sheet, the temperature distribution in all areas of the battery pack is achieved, effectively reducing the temperature difference between cells, delaying battery capacity decay and extending cycle life.

[0028] Intelligent temperature control reduces system energy consumption. It adopts a graded temperature control strategy to automatically adjust the cooling system operation mode and power according to the actual battery temperature. Compared with the traditional constant power heat dissipation system, it effectively reduces system energy consumption and improves overall energy efficiency.

[0029] With strong temperature adaptability and wide applicability, the semiconductor cooling chip can be reverse-energized to achieve heating function. In low-temperature environments in winter, it preheats the battery to ensure normal charging and discharging. In high-temperature environments in summer, it quickly cools down through a triple heat dissipation mode to ensure that the battery operates in the optimal temperature range.

[0030] 3. In this invention, the design of the buffer component adopts a structure that combines the central gear and rack linkage buffer with the four corner damping spring auxiliary buffer to convert the vertical impact force into the horizontal spring compression force. At the same time, the four corner springs form a second-level buffer, which can effectively absorb the vibration and impact during transportation, installation and outdoor operation.

[0031] The bidirectional damping design suppresses rebound oscillations. The damping spring is made of a high damping coefficient material, which can effectively suppress rebound speed while absorbing impact energy to avoid secondary oscillations. After the impact disappears, the fixed platform can be smoothly reset without up-and-down shaking, ensuring the stability of the electrical connection. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the main structure of the fixing box of the present invention;

[0034] Figure 3 This is a schematic diagram of the lithium battery pack structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the connection component structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the lithium battery structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the cooling component structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the water storage tank structure of the present invention;

[0039] Figure 8 This is a schematic diagram of the conveying pipe structure of the present invention;

[0040] Figure 9 This is a schematic diagram of the structure of the first limiting block and the second limiting block of the present invention;

[0041] Figure 10 This is a schematic diagram of the sound insulation cotton structure of the present invention.

[0042] In the diagram: 1. Fixed box body; 2. Fixed platform; 3. Lithium battery; 4. Connecting assembly; 5. Cooling assembly; 6. Buffer assembly; 7. Connecting plate; 8. Guide bar; 9. Connecting block; 10. First limiting block; 11. Fixed plate; 12. Connecting shell; 13. Guide fan; 14. First guide hopper; 15. Conveying pipe; 16. Second guide hopper; 17. First compression spring; 18. Connecting groove; 19. Locking bar; 20. Locking groove; 21. Limiting groove; 22. Second limiting block; 23. Second compression spring; 4. Third compression spring; 25. Circulation pipe; 26. Conductive plate; 27. Water storage tank; 28. Water pump; 29. ​​Semiconductor cooling chip; 30. Heat sink; 31. Fixing frame; 32. First guide rack; 33. Drive gear; 34. Second guide rack; 35. Moving frame; 36. First damping spring; 37. Connecting rod; 38. Second damping spring; 39. Sound insulation cotton; 40. Sound absorption groove; 41. Sound silencing groove; 42. Sound silencing hole; 43. Cavity; 44. Connecting cylinder; 45. Reinforcing rod; 46. Support rod. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0044] Example:

[0045] Please see Figures 1-10 The present invention provides a technical solution:

[0046] A photovoltaic energy storage lithium battery pack includes a fixed box body 1, a fixed platform 2 slidably connected inside the fixed box body 1, multiple sets of lithium batteries 3 are provided on the top of the fixed platform 2, and a connecting component 4 is provided between the multiple sets of lithium batteries 3. A cooling component 5 is provided at the rear end inside the fixed box body 1, and a buffer component 6 is provided at the bottom end inside the fixed box body 1.

[0047] The connecting component 4 is used to assemble two sets of lithium batteries 3. The connecting component 4 includes a connecting plate 7 fixedly connected to the outside of the lithium battery 3. Guide strips 8 are fixedly connected to both ends of the connecting plate 7. Multiple sets of connecting blocks 9 are fixedly connected to the outside of the guide strips 8. First limiting blocks 10 are slidably connected to both sides of the connecting blocks 9. The connecting component 4 also includes a fixing plate 11 fixedly connected to the side of the lithium battery 3 away from the connecting plate 7.

[0048] The cooling assembly 5 is used to dissipate heat from the lithium battery 3. The cooling assembly 5 includes a connecting shell 12 fixedly connected to the rear end of the fixed box body 1. Multiple sets of guide fans 13 are fixedly connected to the top of the connecting shell 12. A first guide bucket 14 is fixedly connected to the bottom of the connecting shell 12. A conveying pipe 15 is fixedly connected to the rear end of the first guide bucket 14. A second guide bucket 16 is fixedly connected to the top of the conveying pipe 15.

[0049] The buffer assembly 6 is used to protect the lithium battery 3.

[0050] Furthermore, the first limiting block 10 extends into the interior of the connecting block 9 and is fixedly connected to the first compression spring 17. Both ends of the fixing plate 11 are provided with connecting grooves 18. The guide strip 8 is inserted into the interior of the connecting groove 18. The middle of the connecting plate 7 is fixedly connected to the locking strip 19. The middle of the fixing plate 11 is provided with the locking groove 20. The locking strip 19 is inserted into the interior of the locking groove 20. By inserting the locking strip 19 into the interior of the locking groove 20, the connecting plate 7 can be connected to the fixing plate 11, thereby allowing the guide strip 8 to be inserted into the interior of the connecting groove 18, thus connecting the two sets of lithium batteries 3.

[0051] Multiple limiting grooves 21 are formed at both ends of the connecting groove 18. A second limiting block 22 is slidably connected to both ends of the limiting groove 21. A second compression spring 23 is fixedly connected to the second limiting block 22 extending into the limiting groove 21. A third compression spring 24 is fixedly connected to the connecting block 9 extending into the guide bar 8. When the guide bar 8 is inserted into the connecting groove 18, the third compression spring 24 drives the connecting block 9 to move, so that the connecting block 9 moves into the limiting groove 21. The second limiting block 22 is moved by the second compression spring 23, and the first limiting block 10 is moved by the first compression spring 17. The second limiting block 22 and the first limiting block 10 contact each other and limit each other, thereby limiting the moving block inside the limiting groove 21. Thus, the two sets of lithium batteries 3 are assembled.

[0052] Secondly, a circulation pipe 25 is fixedly connected inside the connecting shell 12, and multiple sets of conductive plates 26 are fixedly connected to the outside of the circulation pipe 25. A water storage tank 27 is fixedly connected to one end inside the connecting shell 12, and a water pump 28 is fixedly connected to the outside of the water storage tank 27. The two ends of the circulation pipe 25 are fixedly connected to the water pump 28 and the water storage tank 27, respectively. A semiconductor cooling chip 29 is fixedly connected inside the water storage tank 27, and a heat sink 30 is fixedly connected to the outside of the semiconductor cooling chip 29. An air pump is fixedly connected to the outside of the delivery pipe 15. The first guide bucket 14 is located at the bottom inside the fixed box body 1, and the second guide bucket 16 is located at the top inside the fixed box body 1. When the lithium battery 3 is operating, the semiconductor cooling chip 29 is activated, and the cooling end of the semiconductor cooling chip 29 cools the coolant inside the water storage tank 27. When the cooling end is operating, the heat sink 30 cools the heating end. To prevent the heating end from affecting the operation of the cooling end, the water pump 28 is started to introduce low-temperature coolant into the circulation pipe 25, causing the surface of the circulation pipe 25 to dissipate low temperature. In conjunction with multiple sets of conductive plates 26, the internal air temperature of the connecting shell 12 is reduced. The guide fan 13 is started to guide the low-temperature air inside the connecting shell 12 to the surface of the lithium battery 3, thereby enabling heat dissipation of the lithium battery 3. When dissipating heat from the lithium battery 3, the air pump is started to introduce hot air from the top of the fixed box body 1 into the delivery pipe 15 through the second guide bucket 16, so that the hot air is introduced into the first guide bucket 14. The first guide bucket 14 allows the hot air to contact the bottom of the connecting shell 12. In conjunction with the guide fan 13, the hot air is introduced into the connecting shell 12 to exchange heat with the conductive plates 26 and the circulation pipe 25, thereby effectively dissipating heat from the lithium battery 3.

[0053] Furthermore, the buffer assembly 6 includes a fixed frame 31 fixedly connected to the middle of the bottom of the fixed platform 2. Both ends of the fixed frame 31 are fixedly connected to a first guide rack 32. A drive gear 33 is meshed with the outer side of the first guide rack 32. A second guide rack 34 is meshed with the side of the drive gear 33 away from the first guide rack 32. The drive gear 33 is rotatably connected to the fixed box body 1. A movable frame 35 is fixedly connected to the outer side of the second guide rack 34. The movable frame 35 is slidably connected to the fixed box body 1. The inner side of the movable frame 35 is fixed... A first damping spring 36 is fixedly connected to the main body 1 of the fixed box. When the lithium battery pack is vibrated and displaced, it causes the fixed platform 2 to move downward, which in turn causes the fixed frame 31 to move downward, which in turn causes the two sets of first guide racks 32 to move downward, which in turn causes the drive gear 33 to rotate, which causes the second guide rack 34 to move, which in turn causes the moving frame 35 to move upward, compressing the first damping spring 36. The first damping spring 36 can buffer the fixed platform 2, thereby buffering the lithium battery pack.

[0054] Furthermore, connecting rods 37 are fixedly connected to all four sides of the bottom of the fixed platform 2. The connecting rods 37 are slidably connected to the main body 1 of the fixed box. A second damping spring 38 is fixedly connected to the bottom of the connecting rod 37. The second damping spring 38 is fixedly connected to the main body 1 of the fixed box. When the fixed platform 2 moves downward, it drives multiple sets of connecting rods 37 to move downward, compressing the second damping spring 38. Through the cooperation of the second damping spring 38 and the first damping spring 36, the lithium battery pack can be effectively buffered.

[0055] Furthermore, sound-absorbing cotton 39 is fixedly connected to the inner wall of the fixed box body 1. Multiple sets of sound-absorbing grooves 40 are formed inside the sound-absorbing cotton 39, and sound-absorbing grooves 41 are formed inside the sound-absorbing grooves 40. Multiple sets of sound-absorbing holes 42 are formed inside the sound-absorbing grooves 41. A cavity 43 is formed inside the fixed box body 1 and outside the sound-absorbing cotton 39. Multiple sets of connecting cylinders 44 are fixedly connected inside the cavity 43. The connecting cylinders 44 have a hollow structure design. When the lithium battery pack generates noise during operation, the noise is directed into the sound-absorbing grooves 40, thus directing the noise into the sound-absorbing grooves. Inside 41, multiple sets of noise-reducing holes 42 inside the noise-reducing groove 41 reflect noise and consume its energy, thus enabling noise reduction. The connecting tube 44 reduces the contact between the sound insulation cotton 39 and the outer wall of the fixed box body 1, improving the sound insulation and noise reduction effect of the sound insulation cotton 39. The hollow structure design of the connecting tube 44 is used to block the transmission of sound waves through the entire connecting tube 44, thereby reducing the sound waves transmitted to the fixed box body 1 through the connecting tube 44, effectively increasing the sound insulation effect of the fixed box body 1 and reducing noise transmission.

[0056] Furthermore, the lithium battery 3 has multiple sets of reinforcing rods 45 fixedly connected inside, and two sets of support rods 46 fixedly connected to the inner side of the reinforcing rods 45. The reinforcing rods 45 and the two sets of support rods 46 are designed in a triangular structure. The combination of multiple sets of reinforcing rods 45 and support rods 46 can increase the overall strength of the lithium battery 3, thereby increasing its service life.

[0057] In this embodiment, the specific implementation scenario is as follows: In actual use, multiple sets of lithium batteries 3 are first assembled sequentially using tool-less insertion. The connecting plate 7 on one side of the first set of lithium batteries 3 is aligned with the fixing plate 11 of the adjacent lithium battery 3, so that the locking strip 19 in the middle of the connecting plate 7 is inserted into the locking groove 20 in the middle of the fixing plate 11, completing the initial positioning. The lithium batteries 3 are then pushed further, causing the guide strips 8 at both ends of the connecting plate 7 to insert into the connecting grooves 18 at both ends of the fixing plate 11. During the process of the guide strips 8 entering the connecting grooves 18, the connecting block 9 is compressed and retracts inward. When the guide strips 8 are fully in place, the third compression spring 24 pushes the connecting block 9 outward and engages it in the limiting groove 21. Simultaneously, the first compression spring 17 pushes the first limiting block 10 outward, and the second compression spring 23 pushes the second limiting block 22 outward. The first limiting block 10 and the second limiting block 22 engage and limit each other, fixing the connecting block 9 in the limiting groove 21 so that it cannot be removed, thereby achieving mechanical locking and electrical connection between adjacent lithium batteries 3. The multiple lithium batteries 3 are connected in series in the above manner, and then the entire battery pack is placed on the fixed platform 2 and pushed into the fixed box body 1 to complete the assembly of the whole machine.

[0058] During the photovoltaic power generation phase, photovoltaic power is input into the lithium battery pack via an external controller. The current is stably transmitted between multiple lithium batteries 3 through the connecting component 4, thus charging the lithium batteries 3. During charging, the reinforcing rod 45 and the supporting rod 46 inside the lithium battery 3 form a triangular stable support structure, suppressing battery shell expansion and ensuring charging safety and structural stability. When photovoltaic power generation is insufficient or the load power demand increases, the lithium battery pack enters the discharge state, and the power is stably output to the load end through the connecting component 4. Throughout the charging and discharging process, the cooling component 5 automatically starts and stops according to the battery temperature, the buffer component 6 absorbs external vibrations in real time, and the sound insulation and noise reduction structure continuously reduces operating noise, ensuring that the lithium battery pack is always in a safe, stable, and low-noise operating state.

[0059] When the temperature of the lithium battery 3 rises, the cooling component 5 automatically starts. The semiconductor cooling chip 29 operates, its cooling end cooling the coolant inside the water tank 27, and its heating end dissipating heat outward through the heat sink 30. The water pump 28 pumps the low-temperature coolant into the circulation pipe 25, where the coolant circulates. The heat exchange efficiency with the air is greatly improved through the conduction plate 26, allowing the air inside the connecting shell 12 to cool down rapidly. The guide fan 13 blows the low-temperature air from the connecting shell 12 onto the surface of the lithium battery 3, providing forced air cooling. The hot air generated after cooling rises to the top of the fixed box body 1, is drawn into the delivery pipe 15 by the air pump through the second guide hopper 16, and is then discharged to the first guide hopper 14 at the bottom of the fixed box body 1. The discharged hot air is then drawn back into the connecting shell 12 by the guide fan 13 for secondary cooling, forming a closed-loop cooling process of cold air descending, hot air rising, and circulating for further cooling. This allows the temperature of the lithium battery 3 to drop rapidly and remain uniform, preventing localized overheating.

[0060] When the lithium battery pack is subjected to vibration, impact, or bumps, the mounting platform 2 causes the lithium battery 3 to move downwards. Simultaneously, the mounting bracket 31 at the bottom of the mounting platform 2 moves downwards, pushing the first guide rack 32 downwards, which in turn drives the drive gear 33 meshing with it to rotate. The rotation of the drive gear 33 causes the second guide rack 34 to move upwards, pushing the moving frame 35 to compress the first damping spring 36, absorbing the impact energy through the deformation of the first damping spring 36. At the same time, the connecting rods 37 around the bottom of the mounting platform 2 move downwards, compressing the second damping spring 38, forming a dual shock absorption effect of central linkage buffering + four-corner auxiliary buffering. After the impact disappears, the first damping spring 36 and the second damping spring 38 slowly return to their original positions, causing the mounting platform 2 to smoothly return to its original position, avoiding rebound oscillation and ensuring that the lithium battery 3 and the connecting assembly 4 do not loosen, disconnect, or short-circuit.

[0061] The noise generated during the operation of the lithium battery pack first enters the sound insulation cotton 39 on the inner wall of the fixed box body 1, where the sound wave energy is initially absorbed by the sound absorption groove 40. The unabsorbed noise enters the silencer groove 41, where it is repeatedly reflected, interfered with, and consumed by multiple sets of silencer holes 42, resulting in a significant attenuation of the sound wave energy. The remaining small amount of sound waves is transmitted to the cavity 43 of the fixed box body 1, where the cavity 43 forms an air insulation layer, blocking the solid propagation path of the sound waves. The hollow connecting cylinder 44 inside the cavity 43 further cuts off the sound wave transmission, preventing noise from being transmitted outward through structural components. Ultimately, this achieves three-stage noise reduction—sound absorption, silencer, and sound insulation—making the lithium battery pack meet the requirements for quiet use in residential applications. Compared with existing lithium battery packs, this invention improves the overall practicality of the lithium battery pack through its design.

[0062] 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 photovoltaic energy storage lithium battery pack, comprising a fixed housing body (1), characterized in that: The fixed box body (1) is slidably connected to a fixed platform (2). The top of the fixed platform (2) is provided with multiple sets of lithium batteries (3). A connecting component (4) is provided between the multiple sets of lithium batteries (3). A cooling component (5) is provided at the rear end of the fixed box body (1). A buffer component (6) is provided at the bottom end of the fixed box body (1). The connecting component (4) is used to assemble two sets of lithium batteries (3). The connecting component (4) includes a connecting plate (7) fixedly connected to the outside of the lithium battery (3). Guide strips (8) are fixedly connected to both ends of the connecting plate (7). Multiple sets of connecting blocks (9) are fixedly connected to the outside of the guide strips (8). First limiting blocks (10) are slidably connected to both sides of the connecting blocks (9). The connecting component (4) also includes a fixing plate (11) fixedly connected to the side of the lithium battery (3) away from the connecting plate (7). The cooling assembly (5) is used to dissipate heat from the lithium battery (3). The cooling assembly (5) includes a connecting shell (12) fixedly connected to the rear end of the fixed box body (1). Multiple sets of guide fans (13) are fixedly connected to the top of the connecting shell (12). A first guide bucket (14) is fixedly connected to the bottom of the connecting shell (12). A conveying pipe (15) is fixedly connected to the rear end of the first guide bucket (14). A second guide bucket (16) is fixedly connected to the top of the conveying pipe (15). The buffer assembly (6) is used to protect the lithium battery (3).

2. The photovoltaic energy storage lithium battery pack according to claim 1, characterized in that: The first limiting block (10) extends into the interior of the connecting block (9) and is fixedly connected to a first compression spring (17). Both ends of the fixing plate (11) are provided with connecting grooves (18). The guide strip (8) is inserted into the interior of the connecting groove (18). The middle of the connecting plate (7) is fixedly connected to a locking strip (19). The middle of the fixing plate (11) is provided with a locking groove (20). The locking strip (19) is inserted into the interior of the locking groove (20).

3. A photovoltaic energy storage lithium battery pack according to claim 2, characterized in that: Multiple sets of limiting grooves (21) are opened at both ends of the connecting groove (18). A second limiting block (22) is slidably connected to both ends of the limiting groove (21). A second compression spring (23) is fixedly connected to the inside of the limiting groove (21) of the second limiting block (22). A third compression spring (24) is fixedly connected to the inside of the connecting block (9) of the guide strip (8).

4. A photovoltaic energy storage lithium battery pack according to claim 1, characterized in that: A circulation pipe (25) is fixedly connected inside the connecting shell (12). Multiple sets of conductive plates (26) are fixedly connected to the outside of the circulation pipe (25). A water storage tank (27) is fixedly connected to one end inside the connecting shell (12). A water pump (28) is fixedly connected to the outside of the water storage tank (27). The two ends of the circulation pipe (25) are fixedly connected to the water pump (28) and the water storage tank (27) respectively.

5. A photovoltaic energy storage lithium battery pack according to claim 4, characterized in that: The water storage tank (27) is fixedly connected to a semiconductor cooling chip (29), and a heat sink (30) is fixedly connected to the outside of the semiconductor cooling chip (29). An air pump is fixedly connected to the outside of the delivery pipe (15). The first guide bucket (14) is located at the bottom of the fixed box body (1), and the second guide bucket (16) is located at the top of the fixed box body (1).

6. A photovoltaic energy storage lithium battery pack according to claim 1, characterized in that: The buffer assembly (6) includes a fixed frame (31) fixedly connected to the middle of the bottom of the fixed platform (2). Both ends of the fixed frame (31) are fixedly connected to a first guide rack (32). A drive gear (33) is meshed on the outer side of the first guide rack (32). A second guide rack (34) is meshed on the side of the drive gear (33) away from the first guide rack (32).

7. A photovoltaic energy storage lithium battery pack according to claim 6, characterized in that: The drive gear (33) is rotatably connected to the fixed box body (1). A movable frame (35) is fixedly connected to the outer side of the second guide rack (34). The movable frame (35) is slidably connected to the fixed box body (1). A first damping spring (36) is fixedly connected to the inner side of the movable frame (35). The first damping spring (36) is fixedly connected to the fixed box body (1).

8. A photovoltaic energy storage lithium battery pack according to claim 7, characterized in that: Connecting rods (37) are fixedly connected to the bottom of the fixed platform (2) around its perimeter. The connecting rods (37) are slidably connected to the main body (1) of the fixed box. A second damping spring (38) is fixedly connected to the bottom of the connecting rods (37). The second damping spring (38) is fixedly connected to the main body (1) of the fixed box.

9. A photovoltaic energy storage lithium battery pack according to claim 1, characterized in that: The inner wall of the fixed box body (1) is fixedly connected with sound insulation cotton (39). Multiple sets of sound absorption grooves (40) are opened inside the sound insulation cotton (39). A sound silencing groove (41) is opened inside the sound absorption groove (40). Multiple sets of sound silencing holes (42) are opened inside the sound silencing groove (41). A cavity (43) is opened inside the fixed box body (1) and outside the sound insulation cotton (39). Multiple sets of connecting cylinders (44) are fixedly connected inside the cavity (43). The connecting cylinders (44) are designed with a hollow structure.

10. A photovoltaic energy storage lithium battery pack according to claim 1, characterized in that: The lithium battery (3) is internally fixedly connected to multiple sets of reinforcing rods (45), and the inner side of the reinforcing rods (45) is fixedly connected to two sets of support rods (46). The reinforcing rods (45) and the two sets of support rods (46) are designed in a triangular structure.

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