Stable lithium-ion battery pack

Abstract

The present invention discloses a stable lithium-ion battery pack, which includes a battery box body. A battery box cover is detachably installed at the upper end of the battery box body. An equilibrium heat dissipation mechanism is arranged on the inner cavity bottom surface of the battery box body. The equilibrium heat dissipation mechanism includes a cold liquid storage box and a heat equilibrium distribution unit. By adopting an electrolyte with an ultra-long service life and a stable battery pack design, the problems of excessive local heat and limited heat conduction performance caused by the close arrangement of the existing battery packs are effectively solved. Through the battery pack assembly mechanism, the optimal arrangement between each single battery pack unit is realized. An equilibrium heat dissipation mechanism is arranged between two adjacent single battery pack units to form an equilibrium heat dissipation channel, and in cooperation with the heat conduction unit and the battery core, the heat conduction of the single battery pack unit is accelerated, the temperature in the single battery pack unit is timely reduced, the heat conduction performance is improved, and the service life of the lithium-ion battery pack is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium-ion batteries, and particularly relates to an ultra-long-life lithium-ion battery electrolyte and a stable lithium-ion battery pack. Background Art

[0002] The distribution of the electrolyte in the lithium-ion battery pack is mainly concentrated inside the battery cells. Specifically, it is filled in the space between the positive and negative electrodes. The electrolyte is the basis of the battery pack's performance. The ultra-long-life electrolyte provides a stable electrochemical environment for the stable battery pack, ensuring the stable performance of the battery pack under various conditions. With the wide application of electronic products such as electric vehicles and smart phones, the performance requirements for lithium-ion batteries, such as energy density, cycle life, and safety, are increasing day by day. As the core power source of these products, the performance of lithium-ion batteries directly affects the overall performance and user experience of the products.

[0003] In the prior art, the heat dissipation device of the existing battery pack usually uses a conventional combination of water cooling and air cooling to ventilate and cool the inside of the battery pack. However, due to the close arrangement of the battery components and the small gaps between them, it is difficult to evenly distribute the heat on the surface of the battery pack, and the phenomenon of surface temperature accumulation is likely to occur. Moreover, if a liquid cooling heat sink is directly set between the battery cells, the heat between the lithium-ion batteries will be transferred to each other, resulting in local overheating of the battery, that is, the surface heat of the battery cell cannot be evenly dissipated quickly and effectively. Once a thermal runaway occurs in a certain battery cell in the lithium-ion battery pack, its temperature will rise sharply, causing a strong chemical reaction between the electrolyte and the positive and negative electrode materials, which may lead to an explosion.

[0004] Therefore, we propose an ultra-long-life lithium-ion battery electrolyte and a stable lithium-ion battery pack to solve the problem that the close arrangement of existing batteries easily leads to local overheating and affects the heat conduction performance of the battery pack, which can achieve uniform heat dissipation, timely reduce the temperature inside the battery pack, and prevent the occurrence of thermal runaway. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an ultra-long-life lithium-ion battery electrolyte and a stable lithium-ion battery pack, which have the advantages of being able to achieve uniform heat dissipation, timely reduce the temperature inside the battery pack, and prevent the occurrence of thermal runaway.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: In the first aspect, an ultra-long life lithium-ion battery electrolyte is characterized in that: the ultra-long life lithium-ion battery electrolyte comprises the following raw materials in parts by weight: 40 parts of ethylene carbonate (EC), 30 parts of dimethyl carbonate (DMC), 15 parts of ethyl methyl carbonate (EMC), 12 parts of lithium hexafluorophosphate (LiPF6), 2 parts of fluoroethylene carbonate (FEC), and 1 part of vinyl ethylene carbonate (VC).

[0007] In a second aspect, a stable lithium-ion battery pack using the electrolyte as described above comprises a battery case, a battery case cover is detachably mounted on the upper end of the battery case, a balanced heat dissipation mechanism is arranged on the bottom surface of the inner cavity of the battery case, the balanced heat dissipation mechanism comprises a cold liquid storage box and a heat balanced distribution unit, the heat balanced distribution unit is mounted on the upper end of the cold liquid storage box, a battery pack assembly mechanism is arranged on the upper end of the cold liquid storage box, the battery pack assembly mechanism comprises a single battery pack unit and a stabilization unit.

[0008] Preferably, the single battery pack unit includes a single body shell, an upper cover is embedded in the upper end of the single body shell, a lower cover is embedded in the lower end of the single body shell, explosion-proof convex grooves and reinforcing ribs are fixedly provided on the inner wall of the single body shell, and reinforcing sheet metals are fixedly installed on the outer surfaces of both sides of the reinforcing ribs, and the two ends of the reinforcing sheet metal are fixedly connected to the outer surfaces of the upper cover and the lower cover respectively, and a U-shaped socket is fixedly installed on the outer surface of the middle end of the reinforcing sheet metal.

[0009] Preferably, the stabilizing unit includes a cross sealing plate 1 and a cross sealing plate 2, and the cross sealing plate 1 and the cross sealing plate 2 are both in a "cross" shaped plate structure. The two ends of the cross sealing plate 1 and the cross sealing plate 2 are respectively fixedly installed with a side fixing strip 1 and a side fixing strip 2, and the outer surfaces of the side fixing strip 1 and the side fixing strip 2 are movably connected to the inner wall of the U-shaped socket.

[0010] Preferably, the stabilizing unit further comprises a plug-in sealing plate, both ends of which are movably plugged into the upper inner walls of the cross sealing plate 1 and the cross sealing plate 2 respectively.

[0011] Preferably, a battery cell is arranged inside the single body shell, a chip is arranged at the upper end of the battery cell, a positioning bar is arranged at the lower end of the battery cell, the lower end of the positioning bar is fixedly connected to the bottom surface of the inner cavity of the lower cover, a positioning slot is provided on the inner wall of the upper end of the positioning bar, and the inner surface of the positioning slot is movably engaged with the lower end of the battery cell.

[0012] Preferably, a heat conduction unit is fixedly installed on the outer surface of one side of the battery cell. The heat conduction unit includes an embedded strip and a heat conduction plate. Embedded grooves are respectively formed on the inner walls of both sides of the heat conduction plate. The heat conduction plate is movably installed inside the embedded strip. Heat conduction grooves are formed on the outer surface of the heat conduction plate. Heat dissipation fins are installed on the inner walls of the heat conduction grooves. The heat dissipation fins are arranged in a horizontal equidistant array.

[0013] Preferably, the lower surface of the cold liquid storage box is fixedly connected to the inner cavity bottom surface of the battery box body. A liquid inlet valve is arranged on the inner wall of one end of the cold liquid storage box, and a liquid discharge valve is arranged on the inner wall of the end of the cold liquid storage box far from the liquid inlet valve. The outer surfaces of the liquid inlet valve and the liquid discharge valve respectively penetrate through the inner wall of the battery box body and extend to the outside of the battery box body.

[0014] Preferably, the heat balance distribution unit includes a fixed clamp seat and an annular cold liquid circulation pipe. The lower surface of the fixed clamp seat is fixedly connected to the upper surface of the cold liquid storage box. An installation vertical plate is fixedly installed at the upper end of the fixed clamp seat. There are two groups of the installation vertical plates. A support bar is fixedly installed at the upper ends of the two groups of installation vertical plates. Wave-shaped radiating fins are fixedly installed on the inner side surfaces of the two groups of installation vertical plates. The wave-shaped radiating fins are in a wave-shaped plate structure. The annular cold liquid circulation pipe is distributed in a circuitous manner among the wave gaps of the wave-shaped radiating fins.

[0015] Preferably, the input end of the annular cold liquid circulation pipe is hermetically connected to a water guide pipe. One end of the water guide pipe extends into the cold liquid storage box. The output end of the annular cold liquid circulation pipe is hermetically connected to a lead-out pipe. The outer surfaces of the water guide pipe and the lead-out pipe respectively penetrate through the inner wall of the support bar. Circulation pumps are arranged at the ports of the water guide pipe and the lead-out pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Through precise proportioning, the solvent system of the electrolyte is optimized. The stability of the electrolyte during the charge and discharge process of the battery is significantly improved, reducing the decomposition and side reactions of the electrolyte, thereby prolonging the cycle life of the lithium-ion battery. The addition of fluoroethylene carbonate and vinyl ethylene carbonate improves the interfacial stability of the electrolyte, effectively preventing electrolyte leakage and battery thermal runaway under extreme conditions, and significantly improving the safety of the battery. Lithium hexafluorophosphate is used as the electrolyte salt, providing efficient transmission of lithium ions in the electrolyte. The optimized electrolyte formula enhances the performance of the battery at different temperatures. Especially in high-temperature and low-temperature environments, the performance degradation of the battery is effectively inhibited, improving the environmental adaptability of the battery.

[0018] 2. By adopting an electrolyte with an extremely long service life and a stable battery pack design, the problems of excessive local heat and limited heat conduction performance caused by the close arrangement of the existing battery pack are effectively solved. The optimized arrangement between the single battery pack units is achieved through the battery pack assembly mechanism, and an equalizing heat dissipation mechanism is arranged between adjacent two single battery pack units to form an equalizing heat dissipation channel. In cooperation with the heat conduction unit and the battery cell, the heat dissipation of the single battery pack unit is accelerated, the temperature inside the single battery pack unit is timely reduced, the heat conduction performance is improved, and the service life of the lithium-ion battery pack is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structure schematic diagram of the present invention.

[0020] Figure 2 It is a three-dimensional disassembled structure schematic diagram of the present invention.

[0021] Figure 3 It is a connection and disassembly structure schematic diagram of the battery pack assembly mechanism and the equalizing heat dissipation mechanism of the present invention.

[0022] Figure 4 It is a connection structure schematic diagram of the battery pack assembly mechanism and the equalizing heat dissipation mechanism of the present invention.

[0023] Figure 5 It is a disassembled structure schematic diagram of the stabilizing unit and the single battery pack unit of the present invention.

[0024] Figure 6 For the present invention Figure 5 The enlarged structure schematic diagram at A.

[0025] Figure 7 It is a structure schematic diagram of a single group of single battery pack units of the present invention.

[0026] Figure 8 It is a disassembled structure schematic diagram of a single group of single battery pack units of the present invention.

[0027] Figure 9 It is an internal structure schematic diagram of the single body housing of the present invention.

[0028] Figure 10 For the present invention Figure 9 The enlarged structure schematic diagram at B.

[0029] Figure 11 It is a disassembled structure schematic diagram of the battery cell and the heat conduction plate of the present invention.

[0030] Figure 12 For the present invention Figure 11 The enlarged structure schematic diagram at C.

[0031] Figure 13Schematic structural diagram of the balanced heat dissipation mechanism of the present invention.

[0032] Figure 14 Partial disassembled structural diagram of the heat balance distribution unit of the present invention.

[0033] Figure 15 Disassembled structural diagram of the heat balance distribution unit and the clamping heat transfer plate of the present invention.

[0034] Figure 16 For the present invention Figure 15 Enlarged structural diagram at position D.

[0035] In the figure: 1. Battery box body; 11. Battery box cover; 2. Battery pack assembly mechanism; 21. Single battery pack unit; 211. Single battery shell; 2111. Explosion-proof convex groove; 2112. Reinforcing rib; 212. Upper cover; 213. Lower cover; 214. Reinforcing sheet metal; 2141. U-shaped card seat; 22. Stabilizing unit; 221. Cross-shaped sealing plate 1; 222. Cross-shaped sealing plate 2; 223. Side fixing strip 1; 224. Side fixing strip 2; 225. Plug-in sealing plate; 23. Battery cell; 231. Chip; 232. Positioning strip; 2321. Positioning card slot; 24. Heat conduction unit; 241. Embedded strip; 242. Heat conduction plate; 2421. Embedded groove; 2422. Buffer damping; 2423. Soft clamping block; 243. Heat conduction groove; 244. Heat dissipation fin; 3. Balanced heat dissipation mechanism; 31. Cold liquid storage box; 311. Liquid inlet valve; 312. Liquid discharge valve; 32. Heat balance distribution unit; 321. Fixed clamping seat; 322. Installation vertical plate; 3221. Support strip; 323. Wavy heat dissipation fin; 324. Ring-shaped cold liquid circulation pipe; 3241. Water guide pipe; 3242. Outlet pipe; 33. Clamping heat transfer plate; 331. Tapered hole. Specific embodiments

[0036] In order to clearly and completely describe the objectives, technical solutions of the present invention, and make the advantages more clearly understood, the following further elaborates on the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are some but not all of the embodiments of the present invention, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] Example 1, please refer to Figure 1-16, the present invention provides a technical solution: an ultra-long-life lithium-ion battery electrolyte, and the ultra-long-life lithium-ion battery electrolyte comprises raw materials in the following parts by weight: 40 parts of ethylene carbonate (EC), 30 parts of dimethyl carbonate (DMC), 15 parts of ethyl methyl carbonate (EMC), 12 parts of lithium hexafluorophosphate (LiPF6), 2 parts of fluoroethylene carbonate (FEC), and 1 part of vinyl ethylene carbonate (VC); through precise proportioning, the solvent system of the electrolyte is optimized, and the stability of the electrolyte during the charge and discharge process of the battery is significantly improved, reducing the decomposition and side reactions of the electrolyte, thereby extending the cycle life of the lithium-ion battery. The addition of fluoroethylene carbonate (FEC) and vinyl ethylene carbonate (VC) improves the interfacial stability of the electrolyte, effectively preventing electrolyte leakage and battery thermal runaway under extreme conditions such as high temperature and overcharge, significantly improving the safety of the battery. Lithium hexafluorophosphate (LiPF6) serves as the electrolyte salt, providing efficient transmission of lithium ions in the electrolyte. The optimized electrolyte formulation enhances the performance of the battery at different temperatures. Especially in high-temperature and low-temperature environments, the performance degradation of the battery is effectively inhibited, improving the environmental adaptability of the battery.

[0038] Example two, referring to the attached Figure 1-16 , the present invention also provides a technical solution: a stable lithium-ion battery pack using the above-mentioned electrolyte, comprising a battery box body 1, the upper end of the battery box body 1 is detachably installed with a battery box cover 11, and an equalizing heat dissipation mechanism 3 is arranged on the inner cavity bottom surface of the battery box body 1. The equalizing heat dissipation mechanism 3 includes a cold liquid storage box 31 and a heat equalizing distribution unit 32. The heat equalizing distribution unit 32 is installed on the upper end of the cold liquid storage box 31. A battery pack assembly mechanism 2 is arranged on the upper end of the cold liquid storage box 31. The battery pack assembly mechanism 2 includes a single battery pack unit 21 and a stabilizing unit 22; by adopting an ultra-long-life electrolyte and a stable battery pack design, the problems of excessive local heat and limited heat conduction performance caused by the close arrangement of existing battery packs are effectively solved. Through the battery pack assembly mechanism 2, the optimized arrangement between each single battery pack unit 21 is realized, and the equalizing heat dissipation mechanism 3 is arranged between adjacent two single battery pack units 21 to form an equalizing heat dissipation channel, and cooperate with the heat conduction unit 24 and the battery cell 23 to accelerate the conduction of heat dissipation of the single battery pack unit 21, timely reduce the temperature in the single battery pack unit 21, improve the heat conduction performance, and extend the service life of the lithium-ion battery pack.

[0039] Example three, referring to the attached Figure 1-16On the basis of the second embodiment, in order to optimize the arrangement between the monomer battery packs and enhance the assembly stability: the monomer battery pack unit 21 includes a monomer shell 211, an upper cover 212 is embedded and installed at the upper end of the monomer shell 211, and a lower cover 213 is embedded and installed at the lower end of the monomer shell 211. The inner wall of the monomer shell 211 is respectively fixedly provided with an explosion-proof convex groove 2111 and a reinforcing rib 2112, and the outer surfaces of both sides of the reinforcing rib 2112 are respectively fixedly installed with a reinforcing sheet metal 214, and the two ends of the reinforcing sheet metal 214 are respectively connected to The outer surfaces of the upper cover 212 and the lower cover 213 are fixedly connected, and a U-shaped card seat 2141 is fixedly installed on the outer surface of the middle end of the reinforcing sheet metal 214. The stabilizing unit 22 includes a cross sealing plate 1 221 and a cross sealing plate 222. The cross sealing plate 1 221 and the cross sealing plate 222 are both in a "cross" plate structure. The two ends of the cross sealing plate 1 221 and the cross sealing plate 222 are respectively fixedly installed with a side fixing strip 1 223 and a side fixing strip 224. The outer surfaces of the side fixing strip 1 223 and the side fixing strip 224 are connected to the U-shaped card seat 2 The inner wall of the cross sealing plate 141 is movably connected, and the stabilizing unit 22 also includes a plug-in sealing plate 225, and the two ends of the plug-in sealing plate 225 are respectively movably plugged with the upper inner walls of the cross sealing plate 1 221 and the cross sealing plate 222; in this embodiment, the side edges of the multiple groups of single battery pack units 21 are wrapped by the side fixing strip 1 223 and the side fixing strip 224, and the cross sealing plate 1 221 and the cross sealing plate 222 fix the side fixing strip 1 223 and the side fixing strip 224 by tightening bolts, and finally the plug-in sealing plate 225 The tops of multiple groups of single battery pack units 21 are clamped to enhance the stability of the single battery pack units 21 after assembly and prevent shaking during movement or transportation. In addition, explosion-proof grooves 2111 and reinforcing ribs 2112 are set on the surface of the single shell 211. On the one hand, the single shell 211 is reinforced while the overall weight of the single shell 211 can be reduced, saving production costs. Through such a setting, the assembly method of the single battery pack unit 21 is simplified, the arrangement of the battery module is reasonably designed, and the heat dissipation channel is ensured to be unobstructed.

[0040] Embodiment 4, refer to the attached Figure 1-16, on the basis of Embodiment III, in order to achieve the balanced heat conduction of the battery cells inside the single battery pack unit 21: a battery cell 23 is arranged inside the single housing 211, a chip 231 is arranged at the upper end of the battery cell 23, a positioning strip 232 is arranged at the lower end of the battery cell 23, the lower end of the positioning strip 232 is fixedly connected to the inner cavity bottom surface of the lower cover 213, a positioning card slot 2321 is formed on the inner wall of the upper end of the positioning strip 232, and the inner surface of the positioning card slot 2321 is movably embedded with the lower end of the battery cell 23. A heat conduction unit 24 is fixedly installed on the outer surface of one side of the battery cell 23. The heat conduction unit 24 includes an embedded strip 241 and a heat conduction plate 242. Embedding grooves 2421 are respectively formed on the inner walls of both sides of the heat conduction plate 242. The heat conduction plate 242 is movably installed inside the embedded strip 241. A heat conduction groove 243 is formed on the outer surface of the heat conduction plate 242, and heat dissipation fins 244 are installed on the inner wall of the heat conduction groove 243. The heat dissipation fins 244 are arranged in a horizontal equidistant array. In this embodiment, the bottom of the single battery cell 23 is adaptively clamped through the positioning card slot 2321 formed on the positioning strip 232, ensuring the stability of the battery cell 23 during assembly inside the single housing 211, maintaining a certain distance between the battery cells 23, optimizing the layout design of the battery cells 23. By installing the embedded strip 241 on one side surface of the battery cell 23 and aligning both sides of the heat conduction plate 242 with the embedded strip 241 for assembly, when heat is generated on the surface of the battery cell 23, the heat dissipation fins 244 uniformly arranged inside the heat conduction groove 243 can absorb and dissipate the heat. By using the assembly of the heat conduction plates 242 between adjacent two groups of battery cells 23, the heat dissipation effect of each group of battery cells 23 is further enhanced, avoiding the situation of poor heat dissipation of local battery cells 23. And through the detachable manner between the embedded strip 241 and the heat conduction plate 242, it is convenient to quickly disassemble and assemble the whole heat conduction plate 242, with a simple structure and convenient operation.

[0041] Embodiment V, referring to the attached Figure 1-16 , on the basis of Embodiment IV, a buffer component is added in this embodiment: a buffer component is arranged inside the embedding groove 2421. The buffer component includes a buffer damper 2422. One end of the buffer damper 2422 is fixedly connected to the inner wall of the embedding groove 2421, and a soft clamping block 2423 is fixedly installed at the other end of the buffer damper 2422. The inner surface of the soft clamping block 2423 is movably connected to the outer surface of the embedded strip 241. In this embodiment, by adding a buffer component at the assembly clamping position between the heat conduction plate 242 and the embedded strip 241, it can ensure the clamping and protection of the whole heat conduction plate 242, avoiding damage to the battery cell 23 caused by the shaking of the heat conduction plate 242 under the influence of external forces. And through the buffering effect of the buffer damper 2422, the clamping force on the whole heat conduction plate 242 is further strengthened, with a simple structure and convenient assembly.

[0042] Embodiment VI, referring to the attachedFigure 1-16 , on the basis of Embodiment Five, in order to achieve timely heat dissipation of the heat generated on the single battery pack unit 21: the lower surface of the cold liquid storage box 31 is fixedly connected to the inner cavity bottom surface of the battery box body 1, a liquid inlet valve 311 is arranged on the inner wall of one end of the cold liquid storage box 31, and a liquid discharge valve 312 is arranged on the inner wall of the end of the cold liquid storage box 31 away from the liquid inlet valve 311. The outer surfaces of the liquid inlet valve 311 and the liquid discharge valve 312 respectively penetrate through the inner wall of the battery box body 1 and extend to the outside of the battery box body 1. The heat balance distribution unit 32 includes a fixed clamp seat 321 and an annular cold liquid circulation pipe 324. The lower surface of the fixed clamp seat 321 is fixedly connected to the upper surface of the cold liquid storage box 31. An installation vertical plate 322 is fixedly installed at the upper end of the fixed clamp seat 321. There are two groups of installation vertical plates 322. A support bar 3221 is fixedly installed at the upper ends of the two groups of installation vertical plates 322. A wavy heat dissipation fin 323 is fixedly installed on the inner side surface of the two groups of installation vertical plates 322. The wavy heat dissipation fin 323 is in a wavy plate-like structure. The annular cold liquid circulation pipe 324 is distributed in a meandering shape among the wave gaps of the wavy heat dissipation fin 323. The input end of the annular cold liquid circulation pipe 324 is hermetically connected to a water guide pipe 3241. One end of the water guide pipe 3241 extends into the cold liquid storage box 31. The output end of the annular cold liquid circulation pipe 324 is hermetically connected to a water outlet pipe 3242. The outer surfaces of the water guide pipe 3241 and the water outlet pipe 3242 respectively penetrate through the inner wall of the support bar 3221. Circulation pumps are arranged at the ports of the water guide pipe 3241 and the water outlet pipe 3242. In this embodiment, by installing a heat balance distribution unit 32 between two adjacent single battery pack units 21, through the opening and closing of the circulation pump, the coolant in the cold liquid storage box 31 is extracted, and then introduced into the annular cold liquid circulation pipe 324 through the water guide pipe 3241 for circulating flow. The coolant flowing through the annular cold liquid circulation pipe 324 contacts the heat around the wavy heat dissipation fin 323, which can achieve balanced temperature reduction of the heat. And the reason for setting the wavy heat dissipation fin 323 as a wavy plate-like structure is to ensure uniform flow distribution of the heat conducted by the two adjacent single battery pack units 21, and the heat is diffused over a large area. The annular cold liquid circulation pipe 324 is distributed in a meandering shape among the wave gaps, increasing the contact surface with the heat, further improving the heat dissipation effect of the single battery pack unit 21, avoiding the situation that the temperature of a single group of single battery pack units 21 is too high due to local heat accumulation, and extending the overall service life of the single battery pack unit 21.

[0043] Embodiment Seven, referring to the appendix Figure 1-16, on the basis of Embodiment VI, in order to achieve rapid heat conduction between the single battery pack unit 21 and the heat balance distribution unit 32: a clamping heat transfer plate 33 is arranged on the outer surface of the wavy heat sink 323, and the outer surfaces of both ends of the clamping heat transfer plate 33 are fixedly connected to the outer surface of the support bar 3221 respectively. A tapered hole 331 is formed on the inner wall of the clamping heat transfer plate 33. The tapered hole 331 is in the shape of a tapered cylinder with a wider outer part and a narrower inner part. The tapered holes 331 are distributed on both sides of the wavy heat sink 323. In this embodiment, the clamping heat transfer plate 33 is arranged between the spacing positions of the heat balance distribution unit 32 and the single battery pack unit 21, which can ensure enhanced thermal conductivity of the overall single battery pack unit 21 and accelerate the conduction of the heat dissipated by the battery cells 23. The clamping heat transfer plate 33 is arranged at the position between the annular cold liquid circulation pipe 324 and the single battery pack unit 21, ensuring that after the clamping heat transfer plate 33 absorbs the heat generated between two adjacent single battery pack units 21, it quickly cools down through the heat balance distribution unit 32. And through the tapered structure design of the tapered hole 331, it helps the rapid conduction and diffusion of heat. Subsequently, the heat generated by the single battery pack unit 21 is conducted to the heat balance distribution unit 32 through the clamping heat transfer plate 33 again. In this way, the cycle of heat absorption to heat conduction is realized, ensuring that the heat generated by the overall single battery pack unit 21 can be absorbed in time, avoiding local overheating of the single battery pack unit 21, and solving the problem that the overall thermal conductivity of the single battery pack unit 21 is poor and easy to generate accumulated temperature on the surface, thereby improving the thermal conductivity of the single battery pack unit 21.

[0044] Working principle and usage process of the present invention: During actual operation, step one: The bottom of the single-piece battery cell 23 is adaptively clamped through the positioning card slot 2321 opened on the positioning strip 232 to ensure the stability of the battery cell 23 assembled inside the single-body housing 211, maintain a certain distance between the battery cells 23, optimize the layout design of the battery cells 23. By installing the embedding strip 241 on one side surface of the battery cell 23, and aligning both sides of the heat conduction plate 242 with the embedding strip 241 for assembly, and heat absorption and heat dissipation treatment are carried out through the heat dissipation fins 244 uniformly arranged inside the heat conduction groove 243; step two: By installing a group of heat balance distribution units 32 between the single-body battery pack units 21, through the opening and closing of the circulation pump, the coolant in the cold liquid storage box 31 is extracted, and then introduced into the inside of the annular cold liquid circulation pipe 324 through the water guide pipe 3241 for circulating flow. The coolant flowing through the inside of the annular cold liquid circulation pipe 324 contacts the heat around the wavy heat dissipation fin 323, which can achieve balanced heat reduction. And the reason for setting the wavy heat dissipation fin 323 as a wavy plate structure is to ensure the uniform flow distribution of the heat conducted by the two adjacent single-body battery pack units 21, and the heat is diffused over a large area. The annular cold liquid circulation pipe 324 is arranged in a meandering shape between the gaps of the waves, increasing the contact surface with the heat, and further improving the heat dissipation effect of the single-body battery pack unit 21; step three: By arranging the clamping heat conduction plate 33 between the heat balance distribution unit 32 and the single-body battery pack unit 21 at the spacing position, it can ensure enhancing the heat conduction performance of the overall single-body battery pack unit 21, accelerating the conduction of the heat dissipated by the battery cell 23. The clamping heat conduction plate 33 is arranged at the position between the annular cold liquid circulation pipe 324 and the single-body battery pack unit 21, ensuring that after the clamping heat conduction plate 33 absorbs the heat generated between two adjacent single-body battery pack units 21, it is quickly cooled through the heat balance distribution unit 32, and through the conical structure design of the conical hole 331, it helps the rapid conduction and diffusion of heat.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stable lithium-ion battery pack, comprising a battery cell structure and a battery box (1), wherein the battery cell structure is filled with an ultra-long-life lithium-ion battery electrolyte, wherein the ultra-long-life lithium-ion battery electrolyte comprises the following raw materials in parts by weight: The invention adopts 40 parts of ethylene carbonate, 30 parts of dimethyl carbonate, 15 parts of ethyl methyl carbonate, 12 parts of lithium hexafluorophosphate, 2 parts of fluoroethylene carbonate and 1 part of vinyl ethylene carbonate, and is characterized in that: a battery box cover (11) is detachably mounted on the upper end of the battery box (1); a balanced heat dissipation mechanism (3) is arranged on the bottom surface of the inner cavity of the battery box (1); the balanced heat dissipation mechanism (3) comprises a cold liquid storage box (31) and a heat balanced distribution unit (32); the heat balanced distribution unit (32) is mounted on the upper end of the cold liquid storage box (31); a battery pack assembly mechanism (2) is arranged on the upper end of the cold liquid storage box (31); the battery pack assembly mechanism (2) comprises a single battery pack unit (21) and a stabilizing unit (22); The single battery pack unit (21) comprises a single housing (211), a battery cell (23) is arranged inside the single housing (211), a heat conduction unit (24) is fixedly mounted on the outer surface of one side of the battery cell (23), the heat conduction unit (24) comprises an embedding strip (241) and a heat conduction plate (242), embedding grooves (2421) are respectively provided on the inner walls of both sides of the heat conduction plate (242), the heat conduction plate (242) is movably mounted on the inner side of the embedding strip (241), a heat conduction groove (243) is provided on the outer surface of the heat conduction plate (242), and heat dissipation fins (244) are mounted on the inner wall of the heat conduction groove (243), and the heat dissipation fins (244) are arranged in a horizontally equidistant array; The heat balance distribution unit (32) comprises a fixed clamp seat (321) and an annular cold liquid circulation pipe (324); the lower surface of the fixed clamp seat (321) is fixedly connected to the upper surface of the cold liquid storage box (31); a mounting vertical plate (322) is fixedly installed on the upper end of the fixed clamp seat (321); two groups of mounting vertical plates (322) are provided; support bars (3221) are fixedly installed on the upper ends of the two groups of mounting vertical plates (322); 2) is fixedly mounted with a wavy heat sink (323) on the inner surface thereof, the wavy heat sink (323) being a wavy plate-like structure, and the annular cold liquid circulation pipe (324) is distributed in a circuitous manner between the wave gaps of the wavy heat sink (323); a clamping heat transfer plate (33) is arranged on the outer surface of the wavy heat sink (323), the outer surfaces of both ends of the clamping heat transfer plate (33) are respectively fixedly connected to the outer surface of the support bar (3221), and the outer surfaces of the clamping heat transfer plate (33) are fixedly connected to the outer surface of the support bar (3221). A conical hole (331) is provided on the inner wall. The conical hole (331) is a conical cylindrical structure that is wide on the outside and narrow on the inside. The conical holes (331) are distributed on both sides of the wavy heat sink (323). A clamping heat transfer plate (33) is arranged between the heat balance distribution unit (32) and the single battery pack unit (21) to accelerate the conduction of heat dissipated by the battery cell (23). The clamping heat transfer plate (33) is arranged between the annular cold liquid circulation pipe (324) and the single battery pack unit (21). The position between the two adjacent groups of single battery pack units (21) ensures that the clamping heat transfer plate (33) absorbs the heat generated between the two adjacent groups of single battery pack units (21) and then quickly passes through the heat balance distribution unit (32) for cooling. The conical structure design of the conical hole (331) helps to quickly conduct and diffuse the heat. Subsequently, the heat generated by the single battery pack units (21) is again conducted to the heat balance distribution unit (32) through the clamping heat transfer plate (33), thus realizing a cycle from heat absorption to heat conduction. The input end of the annular cold liquid circulation pipe (324) is sealedly connected to a water pipe (3241); one end of the water pipe (3241) extends into the interior of the cold liquid storage box (31); the output end of the annular cold liquid circulation pipe (324) is sealedly connected to an outlet pipe (3242); the outer surfaces of the water pipe (3241) and the outlet pipe (3242) are respectively penetrated by the inner wall of the support bar (3221); and the ports of the water pipe (3241) and the outlet pipe (3242) are both provided with circulation pumps.

2. The stable lithium-ion battery pack according to claim 1, characterized in that: An upper cover (212) is embedded and installed at the upper end of the single shell (211), and a lower cover (213) is embedded and installed at the lower end of the single shell (211). An explosion-proof convex groove (2111) and a reinforcing rib (2112) are fixedly provided on the inner wall of the single shell (211), and reinforcing sheet metal (214) is fixedly installed on the outer surfaces of both sides of the reinforcing rib (2112). The two ends of the reinforcing sheet metal (214) are fixedly connected to the outer surfaces of the upper cover (212) and the lower cover (213), respectively, and a U-shaped holder (2141) is fixedly installed on the outer surface of the middle end of the reinforcing sheet metal (214).

3. The stable lithium-ion battery pack according to claim 2, characterized in that: The stabilizing unit (22) comprises a cross sealing plate 1 (221) and a cross sealing plate 2 (222), the cross sealing plate 1 (221) and the cross sealing plate 2 (222) both being in the form of a "cross" shaped plate structure, the two ends of the cross sealing plate 1 (221) and the cross sealing plate 2 (222) being respectively fixedly mounted with a side fixing strip 1 (223) and a side fixing strip 2 (224), the outer surfaces of the side fixing strip 1 (223) and the side fixing strip 2 (224) being movably engaged with the inner wall of the U-shaped holder (2141).

4. The stable lithium-ion battery pack according to claim 3, characterized in that: The stabilizing unit (22) further comprises a plug-in sealing plate (225), the two ends of which are movably plugged into the upper inner walls of the first cross sealing plate (221) and the second cross sealing plate (222), respectively.

5. The stable lithium-ion battery pack according to claim 1, characterized in that: A chip (231) is provided at the upper end of the battery cell (23), a positioning bar (232) is provided at the lower end of the battery cell (23), the lower end of the positioning bar (232) is fixedly connected to the bottom surface of the inner cavity of the lower cover (213), a positioning slot (2321) is provided on the inner wall of the upper end of the positioning bar (232), and the inner surface of the positioning slot (2321) is movably engaged with the lower end of the battery cell (23).

6. The stable lithium-ion battery pack according to claim 1, characterized in that: The lower surface of the cold liquid storage box (31) is fixedly connected to the bottom surface of the inner cavity of the battery box (1); an inlet valve (311) is provided on the inner wall at one end of the cold liquid storage box (31); and a drain valve (312) is provided on the inner wall at one end of the cold liquid storage box (31) away from the inlet valve (311); the outer surfaces of the inlet valve (311) and the drain valve (312) respectively penetrate the inner wall of the battery box (1) and extend to the outside of the battery box (1).

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