A heat-dissipating cylindrical lithium battery with a self-priming function and a battery heat dissipation module

Abstract

The present invention provides a heat-dissipating cylindrical lithium battery with a self-priming function, comprising: an outer cell assembly, an inner cell assembly, a self-priming assembly and a connecting assembly. The self-priming assembly is arranged at both ends of the outer cell assembly and is used for connecting multiple heat-dissipating cylindrical lithium batteries. The present invention also provides a battery heat dissipation module, which at least includes: an inlet and an outlet are respectively arranged at both ends of the battery module housing; multiple battery groups are closely arranged in the battery module housing, and each battery group includes at least two series-connected lithium batteries with seamless heat dissipation channels. The self-priming assembly can realize pre-tightening between multiple batteries, so that the heat dissipation channels on multiple heat-dissipating cylindrical lithium batteries initially form a seamless heat dissipation path, and further enable the insulating heat dissipation medium to cool the inside and outside of the battery synchronously according to the preset path flow channel, ensuring the high-rate charge and discharge and overall safety of large-diameter lithium batteries, while directing the heat inside the large-diameter cylindrical battery to dissipate, reducing the occurrence of phenomena such as heat accumulation and uneven heat distribution.

Description

Technical Field

[0001] The present invention relates to the technical field of energy and power, and particularly relates to a heat-dissipating cylindrical lithium battery with a self-priming function and a battery heat-dissipating module. Background Art

[0002] Nowadays, various extreme climate phenomena occur frequently, which makes people's awareness of ecological environment protection gradually increase, and the desire to protect the ecological environment has gradually become a consensus. Therefore, the world is currently facing the challenge of energy structure transformation, which makes people's demand for new energy more urgent. At present, the world's energy consumption still mainly relies on fossil fuels such as coal. However, in recent years, with the rapid development of lithium battery technology, due to the many advantages of lithium batteries such as high energy density, low cost, high performance, good safety, long life, and low emissions, they have gradually become a new energy recognized by the market, and the proportion of energy use has been steadily increasing.

[0003] In addition, with the progress of lithium battery technology and the development of science, large-diameter cylindrical batteries have emerged on the market. Compared with small cylindrical lithium batteries, large-diameter cylindrical lithium batteries have the advantages of higher energy density, longer battery life, and stronger power.

[0004] However, due to the increase in volume and the fact that large-diameter cylindrical lithium batteries are solid cylindrical batteries, the thermal resistance of large-diameter cylindrical lithium batteries is relatively large, the radial heat dissipation is difficult, and the temperature gradient inside the battery is relatively large. Moreover, the existing new liquid cooling and immersion cooling methods for cooling large-diameter cylindrical lithium batteries have problems such as unreasonable layout of cooling channels, the cooling medium can only contact and dissipate heat with the outer surface of the large-diameter cylindrical lithium battery, and the poor fluidity of the cooling medium in the battery module, resulting in poor heat dissipation effect and thermal uniformity effect. Therefore, due to the above two reasons, excessive heat accumulates inside the large-diameter cylindrical lithium battery during operation, reducing the safety and service life of the battery. In severe cases, it will lead to thermal runaway, causing losses to people's lives and property, and having limitations. Summary of the Invention

[0005] The present invention is made to solve the above problems, and aims to provide a heat-dissipating cylindrical lithium battery with a self-priming function and a battery heat-dissipating module.

[0006] The present invention provides a heat-dissipating cylindrical lithium battery with a self-suction function, having the following characteristics: including a battery housing; an outer cell assembly disposed inside the battery housing, the outer cell assembly being annular; an inner cell assembly disposed inside the battery housing, the inner cell assembly being cylindrical; two self-suction assemblies respectively disposed at both ends of the outer cell assembly, each self-suction assembly including an annular first insulating plate and a magnet, the first insulating plate being provided with a groove for placing the magnet; a plurality of connecting assemblies respectively disposed at both ends of the outer cell assembly and the inner cell assembly, and one end of each connecting assembly being connected to the outer cell assembly and the other end being connected to the inner cell assembly for electrically connecting the outer cell assembly and the inner cell assembly; wherein, the outer cell assembly is sleeved outside the inner cell assembly, and there is a certain gap between the outer cell assembly and the inner cell assembly to form a seamless heat-dissipating channel for circulating an insulating heat-dissipating medium to dissipate heat from the outer cell assembly and the inner cell assembly, and the magnets at both ends of the outer cell assembly are used for magnetic attraction connection.

[0007] In the heat-dissipating cylindrical lithium battery with a self-suction function provided by the present invention, it can further have the following characteristics: the battery housing includes a first annular battery housing, a second annular battery housing, and a third annular battery housing arranged coaxially. Between the first annular battery housing and the second annular battery housing is a first cavity for placing the outer cell assembly. Between the second annular battery housing and the third annular battery housing is a second cavity of the seamless heat-dissipating channel. Inside the third annular battery housing is a third cavity for placing the inner cell assembly. The second annular battery housing and the third annular battery housing are provided with a plurality of pits for placing a plurality of connecting assemblies.

[0008] In the heat-dissipating cylindrical lithium battery with a self-suction function provided by the present invention, it can further have the following characteristics: the outer cell assembly includes an outer cell, a positive current collector plate, a negative current collector plate, a positive cover plate, and a negative cover plate. The outer cell is annular and is disposed inside the battery housing. The positive current collector plate and the negative current collector plate are both annular, and the positive current collector plate and the negative current collector plate are respectively disposed at both ends of the outer cell and are located below the two first insulating plates. The positive cover plate and the negative cover plate are both annular, and the positive cover plate and the negative cover plate are respectively disposed at both ends of the outer cell and are located above the two first insulating plates.

[0009] Further, a plurality of first raised shells are provided along the circumferential direction on the wall of the positive cover plate, and the plurality of first raised shells are all arranged towards the outside of the battery housing. A plurality of second raised shells are provided along the circumferential direction on the wall of the negative cover plate, and the plurality of second raised shells are all arranged towards the inside of the battery housing. Each first raised shell is fitted with a second raised shell.

[0010] Further, a plurality of third raised shells are provided along the circumferential direction on the wall of the positive current collector plate, and through holes for the third raised shells to pass through are provided on the first insulating plate, so that each third raised shell can be fitted with a second raised shell.

[0011] In the self - sucking function - equipped heat - dissipating cylindrical lithium battery provided by the present invention, it can also have the following characteristics: The inner battery cell assembly includes an inner battery cell, two second insulating plates, two inner battery cell current collectors, and two inner battery cell covers. The inner battery cell is cylindrical and is disposed inside the battery case. The two second insulating plates are both annular. The two second insulating plates are respectively disposed at both ends of the inner battery cell, and multiple recessed portions for placing a plurality of connection components are provided on their plate walls. The two inner battery cell current collectors are both disc - shaped, and first protruding portions with a diameter the same as the inner diameter of the second insulating plate are provided on their disc walls. The two inner battery cell current collectors are respectively disposed at both ends of the inner battery cell and are located below the two second insulating plates. The two inner battery cell covers are both disc - shaped, and second protruding portions with a diameter the same as the inner diameter of the second insulating plate are provided on their plate walls. The two inner battery cell covers are respectively disposed at both ends of the inner battery cell and are located above the two second insulating plates.

[0012] In the self - sucking function - equipped heat - dissipating cylindrical lithium battery provided by the present invention, it can also have the following characteristics: The connection component includes a positive connection bar, a negative connection bar, and a connection insulating sleeve for wrapping the positive connection bar and the negative connection bar. The positive connection bar is disposed at one end of the outer battery cell assembly and the inner battery cell assembly, and one end thereof is connected to the outer battery cell assembly, and the other end is connected to the inner battery cell assembly. The negative connection bar is disposed at the other end of the outer battery cell assembly and the inner battery cell assembly, and one end thereof is connected to the outer battery cell assembly, and the other end is connected to the inner battery cell.

[0013] In a battery heat - dissipation module provided by the present invention, it has the following characteristics: It at least includes a battery module housing, with a plurality of inlets and a plurality of outlets for the inlet and outlet of the insulating heat - dissipation medium respectively provided at both ends; a plurality of battery packs, closely arranged in the battery module housing. Each battery pack at least includes two series - connected lithium batteries with seamless heat - dissipation channels. The seamless heat - dissipation channels in the plurality of lithium batteries with seamless heat - dissipation channels in the same battery pack are connected in series to form an annular seamless heat - dissipation path. The insulating heat - dissipation medium enters the seamless heat - dissipation path through the plurality of inlets on the battery module housing, cools the battery pack, and then flows out from the plurality of outlets. Among them, the lithium battery with a seamless heat - dissipation channel is any one of the above - mentioned self - sucking function - equipped heat - dissipating cylindrical lithium batteries.

[0014] In the battery heat - dissipation module provided by the present invention, it can also have the following characteristics: A flow - guiding block in the shape of an outwardly convex disc is provided at one end of each battery pack facing the inlet. The outwardly convex arc surface of the flow - guiding block faces the inlet, and the disc diameter of the flow - guiding block is the same as the inner diameter of the annular seamless heat - dissipation path.

[0015] In the battery heat dissipation module provided by the present invention, it can also have the following features: A plurality of drainage sleeves are provided on the inner wall of the battery module housing. The plurality of drainage sleeves are annular, and each drainage sleeve is sleeved outside an inlet. The inner diameter of the drainage sleeve is equal to the outer diameter of the annular seamless heat dissipation path. A plurality of notches distributed circumferentially are formed at one end of the drainage sleeve facing the battery pack.

[0016] Functions and effects of the invention

[0017] According to the heat dissipation cylindrical lithium battery with self - suction function involved in the present invention, because a self - suction component is provided on the outer cell component, it is convenient to assemble multiple batteries. And the seamless heat dissipation channels of multiple batteries after assembly are seamlessly connected, so that when the insulating heat dissipation medium flows through the seamless heat dissipation channel, it cannot leak outwards, enabling the insulating heat dissipation medium to flow smoothly through the seamless heat dissipation channel. Furthermore, the battery can have a more definite insulating heat dissipation medium flow field, thus increasing the reliability of the overall heat dissipation of multiple batteries after assembly.

[0018] According to the battery heat dissipation module involved in the present invention, since multiple battery packs are closely arranged in the battery module housing, and each battery pack is at least composed of two series - connected lithium batteries with seamless heat dissipation channels. The multiple seamless heat dissipation channels in the same battery pack are connected in series to form an annular seamless heat dissipation path. The insulating heat dissipation medium flows into the seamless heat dissipation path through the opening on the battery module housing, dissipates heat from the battery pack, and then flows out from the outlet. Therefore, this battery heat dissipation module is beneficial to the flow of the insulating heat dissipation medium, improves the heat dissipation efficiency, and while ensuring the high - rate charge and discharge and overall safety of the battery pack, it can directionally dissipate the heat inside the large - diameter cylindrical battery, reducing the occurrence of phenomena such as heat accumulation and uneven heat distribution.

[0019] In summary, the heat dissipation cylindrical lithium battery with self - suction function and the battery heat dissipation module provided by the present invention have the advantages of high heat exchange efficiency, low temperature gradient inside the battery, high battery safety, and long service life, thus being beneficial for thermal management and avoiding the occurrence of thermal runaway. Description of the drawings

[0020] Figure 1 is a schematic structural diagram of the battery heat dissipation module in the embodiment of the present invention;

[0021] Figure 2 is a cross - sectional view of the battery heat dissipation module in the embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of the battery module housing in the battery heat dissipation module in the embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of the diversion block in the battery heat dissipation module in the embodiment of the present invention;

[0024] Figure 5 It is a schematic structural diagram of a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0025] Figure 6 It is a top view of a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0026] Figure 7 It is a cross - sectional view of a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0027] Figure 8 It is a schematic structural diagram of the battery housing inside a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0028] Figure 9 It is a schematic structural diagram of the positive current collector plate inside a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0029] Figure 10 It is a schematic structural diagram of the negative current collector plate inside a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0030] Figure 11 It is a schematic structural diagram of the positive cover plate inside a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0031] Figure 12 It is a schematic structural diagram of the negative cover plate inside a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0032] Figure 13 It is a schematic structural diagram of the second insulating plate in a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0033] Figure 14 It is a schematic structural diagram of the inner cell current collector plate in a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0034] Figure 15 It is a schematic structural diagram of the inner cell cover plate in a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0035] Figure 16 It is a schematic structural diagram of the first insulating plate inside a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0036] Figure 17 It is a schematic structural diagram of the magnet inside a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0037] Figure 18 It is a schematic structural diagram of the positive connection bar inside a heat - dissipating cylindrical lithium battery with a self - suction function in an embodiment of the present invention;

[0038] Figure 19 It is a schematic structural diagram of the negative connection bar inside the heat-dissipating cylindrical lithium battery with self-priming function in the embodiment of the present invention;

[0039] Figure 20 It is a schematic structural diagram of the connection insulating sleeve inside the heat-dissipating cylindrical lithium battery with self-priming function in the embodiment of the present invention.

[0040] Explanation of reference numerals:

[0041] 100, battery heat dissipation module; 10, battery module housing; 11, drainage sleeve; 111, notch; 12, inlet; 13, outlet; 20, heat-dissipating cylindrical lithium battery; 21, battery housing; 211, first annular battery case; 212, second annular battery case; 213, third annular battery case; 214, pit; 22, outer cell assembly; 221, outer cell; 222, positive current collector plate; 2221, third raised shell; 223, negative current collector plate; 224, positive cover plate; 2241, first raised shell; 225, negative cover plate; 2251, second raised shell; 23, inner cell assembly; 231, inner cell; 232, second insulating plate; 2321, recessed part; 233, inner cell current collector plate; 2331, first raised part; 234, inner cell cover plate; 2341, second raised part; 24, self-priming assembly; 241, first insulating plate; 2411, groove; 2412, through hole; 242, magnet; 25, connection assembly; 251, positive connection bar; 252, negative connection bar; 253, connection insulating sleeve; 26, seamless heat dissipation flow channel; 30, diversion block. Detailed implementation manners

[0042] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the following embodiments will specifically describe the present invention in conjunction with the accompanying drawings.

[0043] Embodiment

[0044] Figure 1 It is a schematic structural diagram of the battery heat dissipation module in the present invention, Figure 2 It is a cross-sectional view of the battery heat dissipation module in the present invention.

[0045] As Figure 1 and Figure 2 shown, this embodiment provides a battery heat dissipation module 100, including: a battery module housing 10, a plurality of battery groups, and a plurality of diversion blocks 30. Among them, each battery group is at least composed of two heat-dissipating cylindrical lithium batteries 20 with self-priming function provided in this embodiment connected in series,

[0046] Figure 3 It is a schematic structural diagram of the battery module housing inside the battery heat dissipation module in the present invention.

[0047] As shown Figures 1 to 3 in FIG. Figures 1 to 3 , a plurality of inlets 12 and a plurality of outlets 13 for the inflow and outflow of an insulating heat dissipation medium are respectively provided at both ends of the battery module housing 10. A plurality of drainage sleeves 11 are provided on the inner wall of the battery module housing 10. The plurality of drainage sleeves 11 are annular, and each drainage sleeve 11 is sleeved outside an inlet 12. The outer diameter of the drainage sleeve 11 is equal to the outer diameter of the annular seamless heat dissipation path. A plurality of notches 111 distributed circumferentially are formed at one end of the drainage sleeve 11 facing the battery pack. In this embodiment, the insulating heat dissipation medium is preferably a coolant capable of cooling the battery pack. In this embodiment, the battery module housing 10 is composed of four shell plates, namely, an upper shell plate, a lower shell plate, a left shell plate and a right shell plate. One of the shell plates can be opened and closed by flipping, so as to facilitate viewing or repairing the battery pack inside the battery module housing 10.

[0048] During operation, since each drainage sleeve 11 is sleeved outside an inlet 12 and the outer diameter of the drainage sleeve 11 is equal to the outer diameter of the annular seamless heat dissipation path, the drainage sleeve 11 can restrict the flow direction of the insulating heat dissipation medium, that is, initially divert the flow direction of the insulating heat dissipation medium. In addition, a plurality of notches 111 distributed circumferentially are formed at one end of the drainage sleeve 11, so that a small amount of the insulating heat dissipation medium can flow into the battery module housing 10. Among them, inside the entire battery module housing, the insulating heat dissipation medium outside the battery pack is more than the insulating heat dissipation medium inside the battery pack. Therefore, the insulating heat dissipation medium outside the battery pack can absorb more heat. On this basis, in the existing situation, if the flow rate of the insulating heat dissipation medium required outside the battery pack is less than the flow rate of the insulating heat dissipation medium inside the battery pack, or the insulating heat dissipation medium outside the battery pack does not flow, the temperature of the insulating heat dissipation medium outside the battery pack will rise with the passage of working time. Therefore, fresh and low-temperature insulating heat dissipation medium needs to be supplemented at this time. Then, the plurality of notches 111 on the drainage sleeve 11 can play a role. After the insulating heat dissipation medium enters the battery module housing 10, due to the internal pressure difference, a small part of the insulating heat dissipation medium will flow out from the notches 111 to the outside of the battery pack, so as to cool the outside of the battery. And the low-speed coolant is sufficient to drive the flow of the coolant inside the module, so that the batteries inside the module maintain a relatively low temperature rise. Finally, after the insulating heat dissipation medium dissipates heat from the inside and outside of the battery pack, it finally flows out from the outlet 13 on the battery module housing 10, completing the circulation of the insulating heat dissipation medium inside the battery module housing 10. Among them, according to the actually required heat dissipation effect, the size of the notches 111 on the drainage sleeve 11 can be adjusted to achieve the optimal temperature control effect.

[0049] As shown Figure 1 and Figure 2As shown, multiple battery packs are closely arranged in the battery module housing 10. The seamless heat dissipation channels 26 in multiple lithium batteries with seamless heat dissipation channels in the same battery pack are connected in series to form a ring-shaped seamless heat dissipation path.

[0050] Figure 4 It is a schematic structural diagram of the diversion block in the battery heat dissipation module of the present invention.

[0051] As Figure 2 and Figure 4 shown, at one end of each battery pack facing the inlet 12, there is a diversion block 30 in the shape of an outwardly convex disc, and the outwardly convex arc surface of the diversion block 30 faces the inlet 12. In this embodiment, since the battery pack is composed of at least two heat dissipation cylindrical lithium batteries 20 with self-suction function in the present invention, in order to enable the diversion block 30 to achieve a better diversion effect, the disc diameter of the diversion block 30 is the same as the inner diameter of the ring-shaped seamless heat dissipation path of the battery pack.

[0052] During operation, the diversion block 30 cooperates with the diversion sleeve 11 to further divert the flow direction of the insulating heat dissipation medium, thereby being able to well solve the problem of the flow field disorder of the insulating heat dissipation medium in the battery module housing 10, and achieving the purpose of small temperature difference between the single cells of the battery pack in the battery module housing 10. Thus, the insulating heat dissipation medium can smoothly flow into the ring-shaped seamless heat dissipation path in the battery pack, and further form a stable insulating heat dissipation medium flow field inside the battery module housing 10, achieving the effect of efficient cooling and heat dissipation. Specifically, when the flow field of the insulating heat dissipation medium is disordered, local eddy currents will be generated inside the flow field, so the cooling effect is limited and the pre-conceived cooling effect cannot be achieved; when the flow field of the insulating heat dissipation medium is stable, the flow rate of the insulating heat dissipation medium can be controlled to achieve efficient heat dissipation.

[0053] Figure 5 It is a schematic structural diagram of the heat dissipation cylindrical lithium battery with self-suction function in the present invention, Figure 6 It is a top view of the heat dissipation cylindrical lithium battery with self-suction function in the present invention, Figure 7 It is a cross-sectional view of the heat dissipation cylindrical lithium battery with self-suction function in the present invention.

[0054] As Figures 5 to 7 shown, this embodiment also provides a heat dissipation cylindrical lithium battery 20 with self-suction function, including: a battery housing 21, an outer battery cell assembly 22, an inner battery cell assembly 23, two self-suction assemblies 24, and multiple connection assemblies 25.

[0055] Figure 8 It is a schematic structural diagram of the battery housing in the heat dissipation cylindrical lithium battery with self-suction function in the embodiment of the present invention.

[0056] As Figure 8As shown, the battery housing 21 includes a first annular battery housing 211, a second annular battery housing 212, and a third annular battery housing 213 that are coaxially arranged. Between the first annular battery housing 211 and the second annular battery housing 212 is a first cavity for placing the outer battery cell assembly 22. Between the second annular battery housing 212 and the third annular battery housing 213 is a second cavity of the seamless heat dissipation flow channel 26. Inside the third annular battery housing 213 is a third cavity for placing the inner battery cell assembly 23. On the second annular battery housing 212 and the third annular battery housing 213 are provided a plurality of pits 214 for placing a plurality of connection components 25. Among them, the battery housing 21 is made of an insulating material.

[0057] In this embodiment, the outer walls of the first annular battery housing 211 and the second annular battery housing 212 near both ends can be flanged towards the direction of the first cavity, so as to facilitate the fixation of the outer battery cell assembly 22 in the first cavity. The outer walls of the third annular battery housing 213 near both ends can be flanged towards the direction of the third cavity, so as to facilitate the fixation of the inner battery cell assembly 23. And, in this embodiment, the first annular battery housing 211 and the second annular battery housing 212 are sealed and fixed to the outer battery cell assembly 22 with sealant, and the third annular battery housing 213 is also sealed and fixed to the inner battery cell assembly 23 with sealant, thus initially ensuring the overall sealed space of the heat dissipation cylindrical lithium battery 20 in the present invention.

[0058] Figure 9 It is a schematic structural diagram of the positive current collector plate inside the heat dissipation cylindrical lithium battery with self - absorption function in the present invention. Figure 10 It is a schematic structural diagram of the negative current collector plate inside the heat dissipation cylindrical lithium battery with self - absorption function in the present invention. Figure 11 It is a schematic structural diagram of the positive cover plate inside the heat dissipation cylindrical lithium battery with self - absorption function in the present invention. Figure 12 It is a schematic structural diagram of the negative cover plate inside the heat dissipation cylindrical lithium battery with self - absorption function in the present invention.

[0059] As Figure 7 and Figures 9 to 12 shown, the outer battery cell assembly 22 includes an outer battery cell 221, a positive current collector plate 222, a negative current collector plate 223, a positive cover plate 224, and a negative cover plate 225.

[0060] As Figure 7 shown, the outer battery cell 221 is annular and is arranged inside the battery housing 21. In this embodiment, the outer battery cell 221 is preferably a wound battery cell and is arranged in the first cavity inside the battery housing 21.

[0061] As Figure 11 and Figure 12As shown, both the positive electrode cover plate 224 and the negative electrode cover plate 225 are in the shape of a circular ring. The positive electrode cover plate 224 and the negative electrode cover plate 225 are respectively arranged at both ends of the outer battery cell 221 and are located above the two first insulating plates 241.

[0062] In this embodiment, a plurality of first convex shells 2241 are arranged on the plate wall of the positive electrode cover plate 224 in the circumferential direction, and the plurality of first convex shells 2241 are all arranged towards the outside of the battery housing 21. A plurality of second convex shells 2251 are arranged on the plate wall of the negative electrode cover plate 225 in the circumferential direction, and the plurality of second convex shells 2251 are all arranged towards the inside of the battery housing 21. Each first convex shell 2241 has a second convex shell 2251 engaged therewith.

[0063] As Figure 9 and Figure 10 shown, both the positive electrode current collector plate 222 and the negative electrode current collector plate 223 are in the shape of a circular ring. The positive electrode current collector plate 222 and the negative electrode current collector plate 223 are respectively arranged at both ends of the outer battery cell 221 and are located below the two first insulating plates 241.

[0064] In this embodiment, a plurality of third convex shells 2221 are arranged on the disk wall of the positive electrode current collector plate 222 in the circumferential direction. Among them, the third convex shells 2221 on the positive electrode current collector plate 222 can be engaged with the first convex shells 2241 on the positive electrode cover plate 224.

[0065] Figure 13 is a schematic structural diagram of the second insulating plate in the heat-dissipating cylindrical lithium battery with self-absorbing function in the embodiment of the present invention, Figure 14 is a schematic structural diagram of the inner battery cell current collector plate in the heat-dissipating cylindrical lithium battery with self-absorbing function in the embodiment of the present invention, Figure 15 is a schematic structural diagram of the inner battery cell cover plate in the heat-dissipating cylindrical lithium battery with self-absorbing function in the embodiment of the present invention.

[0066] As Figure 7 , and Figures 13 to 15 shown, the inner battery cell assembly 23 includes an inner battery cell 231, two second insulating plates 232, two inner battery cell current collector plates 233 and two inner battery cell cover plates 234.

[0067] As Figure 7 shown, the inner battery cell 231 is in a cylindrical shape and is arranged inside the battery housing 21. In this embodiment, the inner battery cell 231 is preferably a wound battery cell and is arranged in the third cavity inside the battery housing 21.

[0068] As Figure 13 shown, both of the two second insulating plates 232 are in the shape of a circular ring. The two second insulating plates 232 are respectively arranged at both ends of the inner battery cell 231, and a plurality of concave portions 2321 for placing a plurality of connection assemblies 25 are provided on their plate walls.

[0069] As Figure 14 shown, both of the two inner cell current collector plates 233 are in the shape of round cakes, and first protrusion parts 2331 with diameters the same as the inner diameters of the second insulating plates 232 are provided on the plate walls. The two inner cell current collector plates 233 are respectively arranged at both ends of the inner cell 231 and are located below the two second insulating plates 232.

[0070] As Figure 15 shown, both of the two inner cell cover plates 234 are in the shape of round cakes, and second protrusion parts 2341 with diameters the same as the inner diameters of the second insulating plates 232 are provided on the plate walls. The two inner cell cover plates 234 are respectively arranged at both ends of the inner cell 231 and are located above the two second insulating plates 232. In this embodiment, the height of the first protrusion part 2331 plus the height of the second protrusion part 2341 is equal to the thickness of the second insulating plate 232, so that the inner cell cover plate 234 is connected to the inner cell current collector plate 233.

[0071] Figure 16 is a schematic structural view of the first insulating plate in the heat-dissipating cylindrical lithium battery with a self-absorbing function in the present invention, Figure 17 is a schematic structural view of the magnet in the heat-dissipating cylindrical lithium battery with a self-absorbing function in the present invention.

[0072] As Figure 16 and Figure 17 shown, two self-absorbing components 24 are respectively arranged at both ends of the outer cell component 22. Each self-absorbing component 24 includes a first insulating plate 241 in the shape of a circular ring and a magnet 242. A groove 2411 for placing the magnet 242 is provided on the first insulating plate 241. Among them, the magnet 242 can be an object such as a magnet or a rubber magnet. In this embodiment, the magnet 242 is preferably a magnet. And, in this embodiment, a plurality of grooves 2411 can be provided on the first insulating plate 241, and the plurality of grooves 2411 are circumferentially distributed on the first insulating plate 241. Therefore, the number of the magnets 242 can be adjusted according to the number of the grooves 2411.

[0073] In this embodiment, a plurality of through holes 2412 for the third protrusion shell 2221 to pass through are formed on the first insulating plate 241, so that each third protrusion shell 2221 can be engaged with a second protrusion shell 2251.

[0074] Figure 18 is a schematic structural view of the positive connection bar in the heat-dissipating cylindrical lithium battery with a self-absorbing function in the present invention, Figure 19 is a schematic structural view of the negative connection bar in the heat-dissipating cylindrical lithium battery with a self-absorbing function in the present invention, Figure 20 is a schematic structural view of the connection insulating sleeve in the heat-dissipating cylindrical lithium battery with a self-absorbing function in the present invention.

[0075] As Figure 5 , andFigures 18 to 20 As shown, a plurality of connecting components 25 are respectively arranged at both ends of the outer battery cell component 22 and the inner battery cell component 23 for electrically connecting the outer battery cell component 22 and the inner battery cell component 23. Among them, each connecting component 25 includes a positive connecting bar 251, a negative connecting bar 252, and a connecting insulating sleeve 253 for wrapping the positive connecting bar 251 and the negative connecting bar 252. The positive connecting bar 251 is arranged at one end of the outer battery cell component 22 and the inner battery cell component 23, and one end thereof is connected to the outer battery cell component 22, and the other end is connected to the inner battery cell component 23. The negative connecting bar 252 is arranged at the other end of the outer battery cell component 22 and the inner battery cell component 23, and one end thereof is connected to the outer battery cell component 22, and the other end is connected to the inner battery cell 231.

[0076] In this embodiment, when two heat-dissipating cylindrical lithium batteries 20 with self-suction functions in the present invention are assembled into a battery pack, the positive electrode cover plate 224 in one heat-dissipating cylindrical lithium battery 20 can be fitted with the negative electrode cover plate 225 in the other heat-dissipating cylindrical lithium battery 20. At this time, the self-suction components 24 on the two heat-dissipating cylindrical lithium batteries 20 can achieve self-suction pre-tightening, so that the seamless heat-dissipating channels 26 on the two heat-dissipating cylindrical lithium batteries 20 naturally form an annular seamless heat-dissipating path. Among them, the annular seamless heat-dissipating path is specifically a flow channel in the shape of an annular straight cylinder. Furthermore, the problem of limited heat-dissipating effect caused by uneven internal flow field distribution of the battery is solved, so that the battery temperature can be effectively controlled. And, compared with other batteries with seamless heat-dissipating channels 26 assembled by the heat-dissipating cylindrical lithium battery 20 with self-suction function in the present invention, the seamless heat-dissipating channels 26 are more distinct, so it can have higher heat-dissipating capacity and heat-dissipating efficiency, so that the battery can better exert its performance, and further improve the stability of the battery under high-rate charge and discharge.

[0077] Functions and effects of the embodiment

[0078] According to the battery heat-dissipating module involved in this embodiment, a plurality of battery packs are closely arranged in the battery module housing, and each battery pack includes at least two series-connected lithium batteries with seamless heat-dissipating channels. The multiple seamless heat-dissipating channels in the same battery pack are connected in series to form an annular seamless heat-dissipating path. The insulating heat-dissipating medium flows into the seamless heat-dissipating path through the opening on the battery module housing, dissipates heat from the battery pack, and then flows out from the outlet. Therefore, this battery heat-dissipating module is beneficial to the flow of the insulating heat-dissipating medium, improves the heat-dissipating efficiency, and while ensuring the high-rate charge and discharge and overall safety of the battery pack, directionally dissipates the heat inside the large-diameter cylindrical battery, reducing the occurrence of phenomena such as heat accumulation and uneven heat distribution.

[0079] Furthermore, in the battery heat dissipation module of the present invention, each drainage sleeve is sleeved outside an inlet, and the inner diameter of the drainage sleeve is equal to the outer diameter of the annular seamless heat dissipation path. Therefore, the drainage sleeve can restrict the flow direction of the insulating heat dissipation medium, that is, preliminarily drain the flow direction of the insulating heat dissipation medium.

[0080] Furthermore, since a plurality of circumferentially distributed notches are formed at one end of the drainage sleeve in the battery heat dissipation module of the present invention, a small amount of insulating heat dissipation medium can flow into the battery module housing. Among them, inside the entire battery module housing, the insulating heat dissipation medium outside the battery pack is more than that inside the battery pack. Therefore, the insulating heat dissipation medium outside the battery pack can absorb more heat. On this basis, in the existing situation, if the required flow rate of the insulating heat dissipation medium outside the battery pack is less than that inside the battery pack, or the insulating heat dissipation medium outside the battery pack does not flow, the temperature of the insulating heat dissipation medium outside the battery pack will rise with the working time. Therefore, fresh and low-temperature insulating heat dissipation medium needs to be supplemented at this time. Then, the plurality of notches on the drainage sleeve can play a role. After the insulating heat dissipation medium enters the battery module housing, due to the internal pressure difference, a small part of the insulating heat dissipation medium will flow out from the notches to the outside of the battery pack, thereby cooling the outside of the battery. And the low-speed coolant is sufficient to drive the flow of the coolant inside the module, so that the batteries inside the module maintain a relatively low temperature rise. Finally, after the insulating heat dissipation medium dissipates heat from the inside and outside of the battery pack, it finally flows out through the outlet on the battery module housing, completing the circulation of the insulating heat dissipation medium inside the battery module housing. Among them, according to the actual required heat dissipation effect, the size of the notches on the drainage sleeve can be adjusted to achieve the optimal temperature control effect.

[0081] Furthermore, since the battery pack in the battery heat dissipation module of the present invention is at least composed of two heat dissipation cylindrical lithium batteries with self-priming functions in the present invention, in order to enable the diversion block to achieve a better diversion effect, the diameter of the disc cross-section of the diversion block is the same as the inner diameter of the seamless heat dissipation path of the battery pack. The diversion block and the drainage sleeve can further divert the flow direction of the insulating heat dissipation medium, thereby well solving the problem of the flow field disorder of the insulating heat dissipation medium in the battery module housing, and achieving the purpose of small temperature difference between the single cells of the battery pack in the battery module housing. Thus, the insulating heat dissipation medium can smoothly flow into the annular seamless heat dissipation path in the battery pack, and further form a stable insulating heat dissipation medium flow field inside the battery module housing, achieving an efficient cooling and heat dissipation effect. Specifically, when the flow field of the insulating heat dissipation medium is disordered, local eddies will be generated inside the flow field, so the cooling effect is limited and the pre-conceived cooling effect cannot be achieved; when the flow field of the insulating heat dissipation medium is stable, the flow rate of the insulating heat dissipation medium can be controlled to achieve efficient heat dissipation.

[0082] According to the heat-dissipating cylindrical lithium battery with self-priming function involved in this embodiment, since a self-priming component is provided on the outer cell component, it is convenient to assemble multiple batteries. And the seamless heat-dissipating channels of multiple batteries after assembly are seamlessly connected, so that the insulating heat-dissipating medium cannot leak out when flowing through the seamless heat-dissipating channel, enabling the insulating heat-dissipating medium to flow smoothly through the seamless heat-dissipating channel, and further enabling the battery to have a more definite insulating heat-dissipating medium flow field. Therefore, the reliability of the overall heat dissipation of multiple batteries after assembly is increased.

[0083] Furthermore, since the two self-priming components in the heat-dissipating cylindrical lithium battery with self-priming function in the present invention are respectively arranged at both ends of the outer cell component, when multiple heat-dissipating cylindrical lithium batteries of the present invention are assembled into a battery pack, pre-tightening between multiple batteries can be achieved, so that the seamless heat-dissipating channels on multiple heat-dissipating cylindrical lithium batteries initially form an annular seamless heat-dissipating path.

[0084] Furthermore, since the outer cell component is sleeved outside the inner cell component, the gap between the outer cell and the inner cell is utilized to form a seamless heat-dissipating channel, enabling the insulating heat-dissipating medium to flow through the seamless heat-dissipating channel to dissipate heat from the outer cell and the inner cell. And the insulating heat-dissipating medium has a large contact area with both the outer cell and the inner cell in the seamless heat-dissipating channel, making the radial heat dissipation more sufficient, thereby reducing the heat accumulated inside the battery during operation, being beneficial to improving the heat transfer efficiency and reducing the temperature gradient inside the battery, facilitating battery thermal management, and further improving the safety and service life of the battery, and avoiding the occurrence of thermal runaway.

[0085] Furthermore, since the first convex shell and the second convex shell that can be mutually engaged are respectively provided on the positive electrode cover plate and the negative electrode cover plate in the inner and outer battery components of the heat-dissipating cylindrical lithium battery with self-priming function in the present invention, when multiple heat-dissipating cylindrical lithium batteries of the present invention are assembled into a battery pack, clamping and fixing between multiple batteries can be achieved, so that the seamless heat-dissipating channels on multiple heat-dissipating cylindrical lithium batteries further form an annular seamless heat-dissipating path.

[0086] Furthermore, since the outer walls of the first annular battery shell and the second annular battery shell near both ends in the heat-dissipating cylindrical lithium battery with self-priming function in the present invention can be flanged towards the direction of the first cavity, it is convenient to fix the outer cell component in the first cavity. The outer walls of the third annular battery shell near both ends can be flanged towards the direction of the third cavity, so as to facilitate the fixing of the inner cell component. And the first annular battery shell and the second annular battery shell are sealed and fixed to the outer cell component through sealant, and the third annular battery shell is also sealed and fixed to the inner cell component through sealant, thereby initially ensuring the sealed space of the overall heat-dissipating cylindrical lithium battery in the present invention.

[0087] In summary, the self-priming heat dissipation cylindrical lithium battery and the battery heat dissipation module provided by the present invention have the advantages of high heat exchange efficiency, low temperature gradient inside the battery, high battery safety, and long service life, which is conducive to thermal management and avoiding thermal runaway.

[0088] The above embodiments are preferred cases of the present invention and are not used to limit the protection scope of the present invention.

Claims

1. A heat-dissipating cylindrical lithium battery with self-priming function, characterized in that, Comprising: A battery housing; An outer battery cell assembly, disposed within the battery housing, the outer battery cell assembly being circular ring-shaped; An inner battery cell assembly, disposed within the battery housing, the inner battery cell assembly being cylindrical; Two self-suction assemblies, respectively disposed at two ends of the outer battery cell assembly, each self-suction assembly including a circular ring-shaped first insulating plate and a magnet, and a groove for placing the magnet is provided on the first insulating plate, A plurality of connection assemblies, respectively disposed at two ends of the outer battery cell assembly and the inner battery cell assembly, and one end of each connection assembly is connected to the outer battery cell assembly and the other end is connected to the inner battery cell assembly, for electrically connecting the outer battery cell assembly and the inner battery cell assembly; Wherein, the outer battery cell assembly is sleeved outside the inner battery cell assembly, and there is a certain gap between the outer battery cell assembly and the inner battery cell assembly, forming a seamless heat dissipation channel, The seamless heat dissipation channel is used for circulating an insulating heat dissipation medium, thereby dissipating heat from the outer battery cell assembly and the inner battery cell assembly, The magnets at two ends of the outer battery cell assembly are used for magnetic attraction connection.

2. The heat-dissipating cylindrical lithium battery with self-suction function according to claim 1, wherein: Among them, The battery housing includes a first annular battery housing, a second annular battery housing and a third annular battery housing which are coaxially arranged, A first cavity for placing the outer battery cell assembly is between the first annular battery housing and the second annular battery housing, a second cavity of the seamless heat dissipation channel is between the second annular battery housing and the third annular battery housing, and a third cavity for placing the inner battery cell assembly is inside the third annular battery housing, A plurality of pits for placing a plurality of the connection assemblies are provided on the second annular battery housing and the third annular battery housing.

3. The heat-dissipating cylindrical lithium battery with self-suction function according to claim 1, wherein: Among them, The outer battery cell assembly includes an outer battery cell, a positive current collector plate, a negative current collector plate, a positive cover plate and a negative cover plate, The outer battery cell is circular ring-shaped and is disposed within the battery housing, Both the positive current collector plate and the negative current collector plate are circular ring-shaped, the positive current collector plate and the negative current collector plate are respectively disposed at two ends of the outer battery cell and are located below the two first insulating plates, Both the positive cover plate and the negative cover plate are circular ring-shaped, the positive cover plate and the negative cover plate are respectively disposed at two ends of the outer battery cell and are located above the two first insulating plates.

4. The heat-dissipating cylindrical lithium battery with self-suction function according to claim 3, wherein: Among them, A plurality of first convex shells are provided along the circumferential direction on the plate wall of the positive cover plate, and all the first convex shells are arranged towards the outside of the battery housing, A plurality of second convex shells are provided along the circumferential direction on the plate wall of the negative cover plate, and all the second convex shells are arranged towards the inside of the battery housing, Each first convex shell is fitted with a second convex shell.

5. The heat-dissipating cylindrical lithium battery with self-suction function according to claim 3, wherein: Among them, A plurality of third convex shells are provided along the circumferential direction on the plate wall of the positive current collector plate, A plurality of through holes for the third convex shell to pass through are formed in the first insulating plate.

6. The heat-dissipating cylindrical lithium battery with self-suction function according to claim 1, characterized in that: Among them, The inner battery cell assembly includes an inner battery cell, two second insulating plates, two inner battery cell current collectors, and two inner battery cell covers. The inner battery cell is cylindrical and is arranged inside the battery case. Both of the two second insulating plates are annular. The two second insulating plates are respectively arranged at both ends of the inner battery cell, and a plurality of recessed portions for placing a plurality of the connection components are provided on their plate walls. Both of the two inner battery cell current collectors are disc-shaped, and a first convex portion with a diameter the same as the inner diameter of the second insulating plate is provided on the disc wall. The two inner battery cell current collectors are respectively arranged at both ends of the inner battery cell and are located below the two second insulating plates. Both of the two inner battery cell covers are disc-shaped, and a second convex portion with a diameter the same as the inner diameter of the second insulating plate is provided on the plate wall. The two inner battery cell covers are respectively arranged at both ends of the inner battery cell and are located above the two second insulating plates.

7. The heat-dissipating cylindrical lithium battery with self-suction function according to claim 1, characterized in that: Among them, The connection component includes a positive connection bar, a negative connection bar, and a connection insulating sleeve for wrapping the positive connection bar and the negative connection bar. The positive connection bar is arranged at one end of the outer battery cell assembly and the inner battery cell assembly, and one end thereof is connected to the outer battery cell assembly, and the other end is connected to the inner battery cell assembly. The negative connection bar is arranged at the other end of the outer battery cell assembly and the inner battery cell assembly, and one end thereof is connected to the outer battery cell assembly, and the other end is connected to the inner battery cell.

8. A battery heat dissipation module, characterized in that, At least includes: A battery module housing, with a plurality of inlets and a plurality of outlets for the insulation and heat-dissipation medium to enter and exit respectively at both ends; A plurality of battery packs, closely arranged in the battery module housing. Each battery pack at least includes two series-connected lithium batteries with seamless heat-dissipation channels. The seamless heat-dissipation channels in a plurality of the lithium batteries with seamless heat-dissipation channels in the same battery pack are connected in series to form an annular seamless heat-dissipation path. The insulation and heat-dissipation medium enters the seamless heat-dissipation path through the plurality of inlets on the battery module housing, cools the battery pack, and then flows out from the plurality of outlets. Wherein, the lithium battery with seamless heat-dissipation channel is the heat-dissipating cylindrical lithium battery with self-suction function according to any one of claims 1-7.

9. The battery heat-dissipation module according to claim 8, characterized in that: Among them, A flow guide block in the shape of an outwardly convex disc is provided at one end of each battery pack facing the inlet. The outwardly convex arc surface of the flow guide block faces the inlet, and the disc diameter of the flow guide block is the same as the inner diameter of the annular seamless heat-dissipation path.

10. The battery heat-dissipation module according to claim 8, characterized in that: Among them, A plurality of drainage sleeves are provided on the inner wall of the battery module housing. A plurality of the drainage sleeves are annular, and each of the drainage sleeves is sleeved outside one of the inlets. The inner diameter of the drainage sleeve is equal to the outer diameter of the annular seamless heat dissipation path. A plurality of notches distributed circumferentially are formed at one end of the drainage sleeve facing the battery pack.

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