A cylindrical long-tube battery cell, battery cell module and battery pack

Abstract

The present invention provides a cylindrical long-tube battery cell, a battery cell module and a battery pack, which belong to the technical field of new energy battery cell modules. The cylindrical long-tube battery cell includes a cylindrical shell, a winding core, a polarity side cover and a liquid-cooling side cover. The cylindrical shell includes a cylindrical outer shell and an inner shell, the diameter of the outer shell is larger than the diameter of the inner shell, the inner shell is located inside the outer shell and is coaxially arranged with the outer shell, a support plate is arranged between the inner shell and the outer shell, and the winding core is installed in the inner shell. There are two polarity side covers, and poles are arranged on the polarity side covers, and the polarity side covers are arranged at both ends of the inner shell. The liquid-cooling side cover is annular and two are arranged, and a liquid guide port is arranged on the liquid-cooling side cover, and the liquid-cooling side cover is arranged at both ends of the outer shell. The use of the cylindrical long-tube battery cell can solve the problem that the existing cylindrical long-tube battery cells occupy a large space after forming a battery cell module and cooperating with a liquid cooling structure, resulting in low space utilization in the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy battery cell modules, and in particular to a cylindrical long-tube battery cell, a battery cell module and a battery pack. Background Art

[0002] Electric vehicles have now entered a period of rapid development, but charging time and driving range are still the pain points that hinder the development of electric vehicles. Lithium-ion power cell modules have become the preferred power source for new energy vehicles due to their high energy density, long cycle life, and environmental friendliness. At present, power batteries mainly include cylindrical cells, soft-pack cells, square hard-shell cells, etc. Among them, the production process technology of cylindrical cells is relatively mature, the PACK preparation cost is low, the battery product yield and the consistency of the battery pack are high. Since the module composed of cylindrical cells has a large heat dissipation area, its heat dissipation performance is better than that of square cells, and its cylindrical shape is convenient for a variety of form combinations, which is suitable for the full layout of electric vehicle space design.

[0003] When the battery module is working, the high rate of charge and discharge will cause the battery temperature to rise too high, thus affecting its performance and life, etc. Therefore, a liquid cooling plate structure for heat dissipation is usually provided in the box containing the battery module. In the related art, after the cylindrical battery cells are arranged in parallel to form a module, a harmonica tube-like serpentine liquid cooling plate is usually used. This liquid cooling plate is bent into an arc and inserted between the cylindrical battery cells arranged in a row and attached to the outer surface of the cylindrical battery cells. Thermally conductive glue is filled between the battery cells and the liquid cooling plate to reduce the contact thermal resistance between the two, and the coolant circulating in the liquid cooling plate is used to exchange heat with the cylindrical battery cells to achieve heat dissipation and temperature uniformity.

[0004] The liquid cooling plate setting form in the related art is adopted. After the cylindrical battery cells form a module, the liquid cooling plate is installed on the outside of the cylindrical battery cells, which needs to occupy a certain space, thereby increasing the overall volume of the battery cell module. After the battery module is finally put into the shell and formed into a PACK, the internal space is large and the space utilization rate is low. Summary of the invention

[0005] The embodiment of the present invention provides a cylindrical long-tube battery cell, a battery cell module and a battery pack, which can solve the problem that the existing cylindrical long-tube battery cells occupy a large space after forming a battery cell module and cooperating with a liquid cooling structure, resulting in low space utilization in the battery pack. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the present invention provides a cylindrical long tube battery cell, comprising:

[0007] Cylindrical shell, winding core, polar side cover and liquid-cooled side cover,

[0008] The cylindrical shell comprises an outer shell and an inner shell in a cylindrical shape, the diameter of the outer shell is larger than the diameter of the inner shell, the inner shell is located inside the outer shell and is coaxially arranged with the outer shell, a support plate is provided between the inner shell and the outer shell, the outer shell and the inner shell are fixedly connected through the support plate, and the winding core is installed in the inner shell;

[0009] The polar side covers are provided with two polarity side covers, each of which is provided with a pole, and the polarity side covers are provided at both ends of the inner shell;

[0010] The liquid-cooled side cover is annular and two are provided. The liquid-cooled side cover is provided with a liquid guide port. The liquid-cooled side cover is provided at both ends of the outer shell. The liquid-cooled side cover covers the gap between the outer shell and the inner shell. The liquid guide port is connected to the gap between the outer shell and the inner shell.

[0011] Optionally, the support plate is strip-shaped and arranged along the axial direction of the cylindrical shell, one side of the support plate in the length direction is connected to the outer side wall of the inner shell, and the other side of the support plate in the length direction is connected to the inner wall of the outer shell.

[0012] Optionally, a plurality of the support plates are provided between the inner shell and the outer shell, and the plurality of the support plates are arranged at equal angles along the circumference of the cylindrical shell.

[0013] Optionally, a connecting protrusion is protruding from one side of the liquid-cooled side cover, the connecting protrusion is arc-shaped and extends along the circumference of the liquid-cooled side cover, the connecting protrusion has an inner cavity connected to the other side of the liquid-cooled side cover, and the liquid guide port is located on the connecting protrusion.

[0014] Optionally, the connecting protrusion is in a minor arc shape, and two connecting protrusions are provided on the liquid-cooling side cover, and the two connecting protrusions are symmetrically arranged relative to the diameter of the liquid-cooling side cover.

[0015] Optionally, the cylindrical elongated battery core includes two winding cores, an insulating partition is provided in the middle of the inner shell, a winding core connector for connecting to the winding core is provided on the insulating partition, and the two winding cores are installed in the inner shell and are respectively located on both sides of the insulating partition.

[0016] Optionally, the length of the winding core ranges from 120 to 600 mm, or from 600 to 2000 mm.

[0017] In the second aspect, an embodiment of the present invention further provides a battery cell module, comprising multiple groups of the cylindrical long cylindrical battery cells described in the first aspect above, and also comprising a water inlet liquid cooling plate and a water outlet liquid cooling plate arranged in parallel and at intervals, each group of the cylindrical long cylindrical battery cells comprises a plurality of the cylindrical long cylindrical battery cells arranged in parallel and adjacent to each other in the horizontal direction, multiple groups of the cylindrical long cylindrical battery cells are stacked in the vertical direction, multiple groups of the cylindrical long cylindrical battery cells are located between the water inlet liquid cooling plate and the water outlet liquid cooling plate, the liquid guide port on the liquid cooling side cover at one end of the cylindrical long cylindrical battery cell is connected to the water inlet liquid cooling plate, and the liquid guide port on the liquid cooling side cover at the other end of the cylindrical long cylindrical battery cell is connected to the water outlet liquid cooling plate.

[0018] Optionally, multiple groups of the cylindrical elongated battery cells are tied and fixed by fixing straps, and adjacent cylindrical elongated battery cells are fixed and bonded by structural adhesive.

[0019] In a third aspect, an embodiment of the present invention further provides a battery pack, comprising a battery cell module as described in the second aspect, and also comprising an outer shell, wherein the battery cell module is installed in the outer shell, and the water inlet liquid cooling plate and the water outlet liquid cooling plate are respectively fitted and connected to the inner wall of the outer shell.

[0020] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0021] While the cylindrical long-tube battery cell is conducting and working, the external liquid cooling circulation mechanism can be used to pass the coolant from the liquid guide port on the liquid cooling side cover on one side into the annular space formed between the inner shell and the outer shell. During the flow of the coolant, it will exchange heat with the heated core inside the inner shell, and finally be discharged from the cylindrical shell through the liquid guide port on the liquid cooling side cover on the other side, thereby achieving heat dissipation and temperature equalization of the core. The internal space of the cylindrical shell that surrounds the outside of the core as a whole is used as a liquid cooling channel, which can achieve sufficient and uniform heat exchange with the internal core, and the heat dissipation and temperature equalization efficiency is high. In addition, in the process of assembling multiple cylindrical long-tube battery cells into a module, the outer shells of a single battery cell and the battery cells can be directly in close contact with each other. Compared with the prior art method of using a harmonica tube-type serpentine liquid cooling plate to dissipate heat and equalize temperature, there is no need to reserve additional assembly space, and the structure is more compact. A larger number of cylindrical long-tube battery cells can be arranged simultaneously in the same internal space of the battery pack, and the corresponding assembly process is also reduced. While improving the heat dissipation and temperature uniformity capability, it effectively solves the problem that the existing cylindrical long-tube battery cells occupy a large space after forming a battery cell module and cooperating with a liquid cooling structure, resulting in low space utilization in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a three-dimensional structure explosion diagram of a cylindrical long tube battery cell provided by an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of a cylindrical long tube battery cell provided in an embodiment of the present invention;

[0025] Figure 3 It is a partial structural cross-sectional view of a cylindrical long tube battery cell provided by an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of a partial structure of a cylindrical shell provided by an embodiment of the present invention;

[0027] Figure 5 is a schematic structural diagram of a polar side cover provided by an embodiment of the present invention;

[0028] Figure 6 is a schematic structural diagram of a liquid-cooled side cover provided in an embodiment of the present invention;

[0029] Figure 7 is a cross-sectional view of an assembly structure of a cylindrical shell and a winding core provided by an embodiment of the present invention;

[0030] Figure 8 is a cross-sectional view of another assembly structure of a cylindrical shell and a winding core provided by an embodiment of the present invention;

[0031] Fig. 9 is a structural exploded diagram of a battery module provided by an embodiment of the present invention;

[0032] Fig.10 is a schematic diagram of the internal structure of a battery pack provided by an embodiment of the present invention;

[0033] Fig.11 It is a schematic diagram of the internal structure of another battery pack provided in an embodiment of the present invention.

[0034] In the figure:

[0035] 1-cylindrical shell; 2-winding core; 3-polarity side cover; 4-liquid cooling side cover; 5-water inlet liquid cooling plate; 6-water outlet liquid cooling plate; 7-fixing strap; 8-outer shell; 11-outer shell; 12-inner shell; 13-support plate; 31-pole; 41-liquid guide port; 42-connecting protrusion; 121-insulating partition; 122-winding core connector; m-electrical connection bus. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] When the battery module is working, the high rate of charge and discharge will cause the battery temperature to rise too high, thus affecting its performance and life, etc. Therefore, a liquid cooling plate structure for heat dissipation is usually provided in the box containing the battery module. In the related art, after the cylindrical battery cells are arranged in parallel to form a module, a harmonica tube-like serpentine liquid cooling plate is usually used. This liquid cooling plate is bent into an arc and inserted between the cylindrical battery cells arranged in a row and attached to the outer surface of the cylindrical battery cells. Thermally conductive glue is filled between the battery cells and the liquid cooling plate to reduce the contact thermal resistance between the two, and the coolant circulating in the liquid cooling plate is used to exchange heat with the cylindrical battery cells to achieve heat dissipation and temperature uniformity.

[0038] The liquid cooling plate setting form in the related art is adopted. After the cylindrical battery cells form a battery module, the liquid cooling plate is installed on the outside of the cylindrical battery cells, which needs to occupy a certain space, thereby increasing the overall volume of the battery module. After the battery module is finally put into the shell and forms a PACK, the internal space is large and the space utilization rate is low.

[0039] Figure 1 It is a three-dimensional structure explosion diagram of a cylindrical long tube battery cell provided in an embodiment of the present invention. Figure 2 It is a schematic diagram of the three-dimensional structure of a cylindrical elongated battery cell provided in an embodiment of the present invention. Figure 3 It is a partial structural cross-sectional view of a cylindrical elongated battery cell provided in an embodiment of the present invention. Figure 4 It is a schematic diagram of the partial structure of a cylindrical shell provided in an embodiment of the present invention. Figure 5 It is a schematic structural diagram of a polar side cover provided in an embodiment of the present invention. Figure 6 It is a schematic diagram of the structure of the liquid-cooled side cover provided in an embodiment of the present invention. Figure 7 It is a cross-sectional view of an assembly structure of a cylindrical shell and a winding core provided by an embodiment of the present invention. Figure 8 FIG. 1 is a cross-sectional view of another assembly structure of a cylindrical shell and a winding core provided by an embodiment of the present invention. Figures 1 to 8 As shown, through practice, the applicant provides a cylindrical long-tube battery cell, a cylindrical shell 1, a winding core 2, a polarity side cover 3 and a liquid-cooling side cover 4.

[0040] The cylindrical shell 1 includes a cylindrical outer shell 11 and an inner shell 12. The diameter of the outer shell 11 is larger than the diameter of the inner shell 12. The inner shell 12 is located inside the outer shell 11 and is coaxially arranged with the outer shell 11. A support plate 13 is provided between the inner shell 12 and the outer shell 11. The outer shell 11 and the inner shell 12 are fixedly connected through the support plate 13, and the winding core 2 is installed in the inner shell 12.

[0041] Two polarity side covers 3 are provided, and poles 31 are provided on the polarity side covers 3 . The polarity side covers 3 are provided at both ends of the inner shell 12 .

[0042] The liquid-cooled side cover 4 is annular and is provided with two. A liquid guide port 41 is provided on the liquid-cooled side cover 4. The liquid-cooled side cover 4 is provided at both ends of the outer shell 11. The liquid-cooled side cover 4 covers the gap between the outer shell 11 and the inner shell 12. The liquid guide port 41 is connected to the gap between the outer shell 11 and the inner shell 12.

[0043] In the embodiment of the present invention, when preparing the cylindrical long-tube battery cell, the winding core 2 is loaded into the inner shell 12 from the end of the cylindrical shell 1, and then the pole ears extending from the two ends of the winding core 2 are ultrasonically welded to the poles 31 on the two polarity side covers 3, and then the two polarity side covers 3 are covered at the two ends of the inner shell 12, and then the polarity side covers 3 are fixedly connected to the two ends of the inner shell 12 by laser welding. Finally, the two liquid-cooled side covers 4 are covered at the two ends of the outer shell 11, and after the annular liquid-cooled side covers 4 cover the gap between the outer shell 11 and the inner shell 12, the liquid-cooled side covers 4 are fixedly connected to the two ends of the outer shell 11 by laser welding, and the preparation of the cylindrical long-tube battery cell is completed. In actual use, the liquid guide ports 41 on the liquid-cooled side covers 4 at both ends of the cylindrical shell 1 can be respectively connected to corresponding liquid cooling circulation mechanisms such as external liquid cooling plates. The liquid guide ports 41 on one side of the liquid-cooled side cover 4 can be used as liquid inlets, and the liquid guide ports 41 on the other side of the liquid-cooled side cover 4 can be used as liquid outlets. With the connection support of the support plate 13, the annular space formed between the inner shell 12 and the outer shell 11 can be used as a flow space for the coolant. The poles 31 on the polar side covers 3 at both ends of the cylindrical shell 1 can be connected to electrical equipment through lines, or connected in series and parallel with other cylindrical long-tube batteries using an electrical connection bus m. While the cylindrical long-tube battery cell is conducting and working, the external liquid cooling circulation mechanism can be used to pass the coolant from the liquid guide port 41 on the liquid cooling side cover 4 on one side into the annular space formed between the inner shell 12 and the outer shell 11. During the flow of the coolant, it will exchange heat with the heated core 2 inside the inner shell 12, and finally be discharged from the cylindrical shell 1 through the liquid guide port 41 on the other side of the liquid cooling side cover 4, so as to achieve heat dissipation and temperature equalization of the core 2. The internal space of the cylindrical shell 1 that surrounds the outside of the core 2 as a whole is used as a liquid cooling channel, which can achieve sufficient and uniform heat exchange with the internal core 2, and the heat dissipation and temperature equalization efficiency is high. In addition, in the process of assembling a module of multiple cylindrical long-tube battery cells, the outer shells 11 between the single battery cells and the battery cells can be directly in close contact with each other. Compared with the method of using a harmonica tube-type serpentine liquid cooling plate to dissipate heat and equalize temperature in the prior art, there is no need to reserve additional assembly space, and the structure is more compact. A larger number of cylindrical long-tube battery cells can be arranged in the same internal space of the battery pack at the same time, and the corresponding assembly process is also reduced. While improving the heat dissipation and temperature uniformity capability, it effectively solves the problem that the existing cylindrical long-tube battery cells occupy a large space after forming a battery cell module and cooperating with a liquid cooling structure, resulting in low space utilization in the battery pack.

[0044] Optionally, the support plate 13 is strip-shaped and arranged along the axial direction of the cylindrical shell 1, one side of the support plate 13 in the length direction is connected to the outer wall of the inner shell 12, and the other side of the support plate 13 in the length direction is connected to the inner wall of the outer shell 11. Exemplarily, in the embodiment of the present invention, by setting the support plate 13 as a strip plate structure arranged along the axial direction of the cylindrical shell 1, it can play a certain guiding role in the process of coolant flow, reduce the resistance generated by the contact with the support plate 13 during the flow of the coolant, ensure the smooth flow of the coolant between the inner shell 12 and the outer shell 11, and further improve the heat dissipation and temperature uniformity effect.

[0045] Optionally, a plurality of support plates 13 are provided between the inner shell 12 and the outer shell 11, and the plurality of support plates 13 are arranged at equal angles along the circumference of the cylindrical shell 1. Exemplarily, in an embodiment of the present invention, a plurality of support plates 13 arranged at equal angles along the circumference evenly divide the annular space formed between the inner shell 12 and the outer shell 11 into a plurality of straight flow channels. After entering between the inner shell 12 and the outer shell 11, the coolant will flow evenly and along the shortest path under the guidance of the plurality of flow channels, avoiding turbulence between the inner shell 12 and the outer shell 11. After heat exchange, the coolant can stably and quickly flow out of the cylindrical shell 1 to achieve circulation, further improving the heat dissipation and temperature uniformity effect.

[0046] Optionally, a connecting protrusion 42 is protruding from one side of the liquid-cooled side cover 4. The connecting protrusion 42 is arc-shaped and extends along the circumference of the liquid-cooled side cover 4. The connecting protrusion 42 has an inner cavity connected to the other side of the liquid-cooled side cover 4, and the liquid guide port 41 is located on the connecting protrusion 42. Exemplarily, in an embodiment of the present invention, when modularizing the cylindrical long-tube battery cell, by setting the liquid guide port 41 on the connecting protrusion 42 protruding from the surface of the liquid-cooled side cover 4, the connection between the liquid guide port 41 and the external liquid cooling structure is gradiently differentiated in the plane where the pole 31 on the polar side cover 3 located in the inner circle is located, so that the electrical connection bus m or line for connecting between the plurality of poles 31 is conveniently set, thereby improving the practicality of the cylindrical long-tube battery cell.

[0047] Optionally, the connecting protrusion 42 is in the shape of a minor arc, and two connecting protrusions 42 are provided on the liquid-cooled side cover 4, and the two connecting protrusions 42 are symmetrically arranged relative to the diameter of the liquid-cooled side cover 4. For example, in an embodiment of the present invention, by providing two minor arc-shaped connecting protrusions 42, the coolant can simultaneously enter the inner cavity of the connecting protrusion 42 through the liquid guide ports 41 on the two connecting protrusions 42, and then enter the flow channels defined by the multiple support plates 13 respectively. When the liquid is discharged, the coolant can also be respectively converged in the inner cavity of the two connecting protrusions 42, and then discharged through the liquid guide ports 41, which effectively improves the overall flow rate, flow and uniformity of the coolant in the cooling cycle, and further improves the heat dissipation and temperature equalization effect. At the same time, the gap between the two connecting protrusions 42 in the arc direction can also be used as an electrical connection bus m or line set to be connected between multiple poles 31, and limit and fix it.

[0048] It should be noted that, in the embodiment of the present invention, since the connecting protrusion 42 is in an arc shape, the inner cavity in the connecting protrusion 42, which is also in an arc shape, is connected to the gap between the outer shell 11 and the inner shell 12. As long as there is a part of the open gap at both ends in the arc direction and between the two adjacent support plates 13, it can be connected to the flow channel below the gap between the two connecting protrusions 42 in the arc direction.

[0049] Optionally, the cylindrical elongated battery cell includes two winding cores 2, an insulating partition 121 is provided in the middle of the inner shell 12, a winding core connector 122 for connecting to the winding core 2 is provided on the insulating partition 121, and the two winding cores 2 are installed in the inner shell 12 and are respectively located on both sides of the insulating partition 121. Exemplarily, in the implementation of the present invention, for winding cores 2 of different length specifications, inner shells 12 with different internal structures can be used. For example, in one possible implementation method, for shorter winding cores 2 with a length range of 120 to 600 mm, an inner shell 12 with an insulating partition 121 in the middle of the inner shell 12 can be used. In the process of loading the winding cores 2, the two winding cores 2 are respectively loaded from both ends of the inner shell 12, and are connected in series through the winding core connector 122 on the insulating partition 121, such as Figure 8 As shown; in another possible implementation, for a longer core 2 having a length ranging from 600 to 2000 mm, a full-through inner shell 12 can be directly used, and the core 2 can be loaded in a single-side manner, such as Figure 7 As shown, the practicality and adaptability of the cylindrical housing 1 are effectively improved.

[0050] Fig. 9 FIG. 1 is an exploded view of a battery module provided by an embodiment of the present invention. Fig. 9 As shown, the embodiment of the present invention also provides a battery module, including multiple groups such as Figures 1 to 8The cylindrical long-tube battery cell shown also includes a water inlet liquid cooling plate 5 and a water outlet liquid cooling plate 6 arranged in parallel and at intervals. Each group of cylindrical long-tube battery cells includes a plurality of cylindrical long-tube battery cells arranged in parallel and adjacent to each other in the horizontal direction. The plurality of groups of cylindrical long-tube battery cells are stacked in the vertical direction. The plurality of groups of cylindrical long-tube battery cells are located between the water inlet liquid cooling plate 5 and the water outlet liquid cooling plate 6. The liquid guide port 41 on the liquid cooling side cover 4 at one end of the cylindrical long-tube battery cell is connected to the water inlet liquid cooling plate 5, and the liquid guide port 41 on the liquid cooling side cover 4 at the other end of the cylindrical long-tube battery cell is connected to the water outlet liquid cooling plate 6. In an embodiment of the present invention, a plurality of groups of the aforementioned cylindrical long-tube battery cells are stacked and arranged in a horizontally lying manner to form a battery cell module. The outer shells 11 between the single battery cells and the battery cells can be directly in close contact with each other. Compared with the method of using a harmonica tube-like serpentine liquid cooling plate to dissipate heat and evenly distribute temperature in the prior art, no additional assembly space is required, and the structure is more compact. During operation, the water inlet liquid cooling plate 5 and the water outlet liquid cooling plate 6 on both sides are used to simultaneously supply and return water to all the cylindrical long-tube battery cells, and the internal space of the cylindrical shell 1 that surrounds the outside of the winding core 2 as a whole is used as a liquid cooling channel, which can achieve fully and evenly heat exchange with the internal winding core 2 and has high heat dissipation and temperature uniformity efficiency.

[0051] Fig.11 FIG. 1 is a schematic diagram of the internal structure of another battery pack provided by an embodiment of the present invention. Fig.11 In another possible implementation, by adjusting the number of cylindrical cells in each group, after stacking multiple groups of cylindrical cells to form a module, the overall cross-section can form an uneven profile, so that it can be installed in a battery pack with an uneven profile, or in a car chassis. The structure has a high degree of freedom in adjustment and is highly practical.

[0052] Optionally, multiple groups of cylindrical long-tube battery cells are tied and fixed by fixing straps 7, and adjacent cylindrical long-tube battery cells are fixed and bonded by structural adhesive. For example, in an embodiment of the present invention, after multiple groups of cylindrical long-tube battery cells are stacked, the shells 11 of the cylindrical long-tube battery cells between layers are attached to each other to form a honeycomb structure, and the gaps between these honeycomb structures are bonded and fixed by injecting structural adhesive, and the outer shells 11 located on the outermost side are tied and fixed in the length direction by multiple fixing straps 7. The structure is simple and the mechanical strength is high.

[0053] Fig.10 Schematic diagram of the internal structure of a battery pack provided by an embodiment of the present invention. Fig.10 As shown, the embodiment of the present invention also provides a battery pack, including Fig. 9The battery cell module shown also includes an outer shell 8, the battery cell module is installed in the outer shell 8, and the water inlet liquid cooling plate 5 and the water outlet liquid cooling plate 6 are respectively connected to the inner wall of the outer shell 8. In the embodiment of the present invention, after a plurality of groups of the aforementioned cylindrical long-tube battery cells are stacked and arranged in a horizontal manner to form a battery cell module and loaded into the outer shell 8 of the battery pack, the liquid guide ports 41 on the liquid-cooled side covers 4 on both sides of the cylindrical long-tube battery cells are respectively connected to the water inlet liquid cooling plate 5 and the water outlet liquid cooling plate 6 on the opposite side walls of the outer shell 8. During charging and discharging, the side walls of the outer shell 8 can play a role in fixing the sides of the cylindrical long-tube battery cells in the battery cell module, further improving the mechanical strength of the overall module. Moreover, in the process of assembling a module with multiple cylindrical long-tube battery cells, the outer shells 11 between the single battery cells can be directly in close contact with each other. Compared with the prior art method of using a harmonica-tube-like serpentine liquid cooling plate to dissipate heat and evenly distribute temperature, there is no need to reserve additional assembly space, and the structure is more compact. A larger number of cylindrical long-tube battery cells can be simultaneously arranged in the same internal space of the outer shell 8, and the space utilization rate is high.

[0054] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] The above descriptions are merely optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical long tube battery cell, It is characterized in that include: Cylindrical shell (1), winding core (2), polar side cover (3) and liquid cooling side cover (4), The cylindrical shell (1) comprises an outer shell (11) and an inner shell (12) in a cylindrical shape, the diameter of the outer shell (11) being larger than the diameter of the inner shell (12), the inner shell (12) being located inside the outer shell (11) and being coaxially arranged with the outer shell (11), a support plate (13) being provided between the inner shell (12) and the outer shell (11), the outer shell (11) and the inner shell (12) being fixedly connected via the support plate (13), and the winding core (2) being installed in the inner shell (12); Two polarity side covers (3) are provided, and polarity columns (31) are provided on the polarity side covers (3). The polarity side covers (3) are provided on both ends of the inner shell (12); The liquid-cooling side cover (4) is annular and is provided with two liquid-conducting ports (41). The liquid-cooling side cover (4) is provided at both ends of the outer shell (11). The liquid-cooling side cover (4) covers the gap between the outer shell (11) and the inner shell (12). The liquid-conducting ports (41) are in communication with the gap between the outer shell (11) and the inner shell (12).

2. The cylindrical elongated battery cell according to claim 1, It is characterized in that The support plate (13) is strip-shaped and arranged along the axial direction of the cylindrical shell (1); one side of the support plate (13) in the length direction is connected to the outer wall of the inner shell (12); and the other side of the support plate (13) in the length direction is connected to the inner wall of the outer shell (11).

3. The cylindrical elongated battery cell according to claim 2, It is characterized in that A plurality of support plates (13) are provided between the inner shell (12) and the outer shell (11), and the plurality of support plates (13) are arranged at equal angles along the circumference of the cylindrical shell (1).

4. The cylindrical elongated battery cell according to claim 1, It is characterized in that A connecting protrusion (42) is protruding from one side of the liquid-cooled side cover (4); the connecting protrusion (42) is arc-shaped and extends along the circumference of the liquid-cooled side cover (4); the connecting protrusion (42) has an inner cavity connected to the other side of the liquid-cooled side cover (4); and the liquid guide port (41) is located on the connecting protrusion (42).

5. The cylindrical elongated battery cell according to claim 4, It is characterized in that The connecting protrusion (42) is in a minor arc shape, and two connecting protrusions (42) are provided on the liquid-cooling side cover (4). The two connecting protrusions (42) are symmetrically arranged relative to the diameter of the liquid-cooling side cover (4).

6. The cylindrical elongated battery cell according to claim 1, It is characterized in that The cylindrical elongated battery core comprises two winding cores (2); an insulating partition (121) is provided in the middle of the inner shell (12); a winding core connector (122) for connecting to the winding core (2) is provided on the insulating partition (121); the two winding cores (2) are installed in the inner shell (12) and are respectively located on both sides of the insulating partition (121).

7. The cylindrical elongated battery cell according to claim 6, It is characterized in that The length of the winding core (2) ranges from 120 to 600 mm, or from 600 to 2000 mm.

8. A battery cell module, comprising a plurality of groups of cylindrical elongated battery cells as claimed in any one of claims 1 to 7, It is characterized in that It also includes a water inlet liquid cooling plate (5) and a water outlet liquid cooling plate (6) arranged in parallel and at intervals, each group of the cylindrical long-tube battery cells includes a plurality of the cylindrical long-tube battery cells arranged in parallel and adjacent to each other in the horizontal direction, and the plurality of groups of the cylindrical long-tube battery cells are stacked in the vertical direction. The plurality of groups of the cylindrical long-tube battery cells are located between the water inlet liquid cooling plate (5) and the water outlet liquid cooling plate (6), the liquid guide port (41) on the liquid cooling side cover (4) at one end of the cylindrical long-tube battery cell is connected to the water inlet liquid cooling plate (5), and the liquid guide port (41) on the liquid cooling side cover (4) at the other end of the cylindrical long-tube battery cell is connected to the water outlet liquid cooling plate (6).

9. The battery cell module according to claim 8, It is characterized in that A plurality of groups of the cylindrical elongated battery cells are bound and fixed by means of fixing straps (7), and adjacent cylindrical elongated battery cells are fixed and bonded by means of structural adhesive.

10. A battery pack, comprising the battery cell module according to any one of claims 8 to 9, It is characterized in that It also comprises an outer shell (8), the battery cell module is installed in the outer shell (8), and the water inlet liquid cooling plate (5) and the water outlet liquid cooling plate (6) are respectively connected to the inner side wall of the outer shell (8).

Images