Cylindrical battery structure

Abstract

The utility model provides a cylindrical battery structure which comprises a shell, a core bag, an extension cylinder and a cover plate, the core bag is arranged in the shell, the cover plate covers the top of the shell in a sealing mode, a positive electrode confluence piece is arranged above the core bag, the extension cylinder is provided with a downward lower opening, and a negative electrode confluence piece is arranged on the periphery of the extension cylinder in a sleeved mode. A first isolation assembly is arranged between the extension cylinder and the bottom wall of the shell, a negative pole is arranged at the top of the extension cylinder, and a second isolation assembly sleeves the periphery of the pole. According to the cylindrical battery structure provided by the utility model, the positive electrode confluence sheet at the top of the core package is connected with the bottom wall of the cover plate, the negative electrode confluence sheet at the bottom of the core package upwards penetrates through the core package through the extension cylinder, the negative electrode column penetrates through the cover plate to lead out the negative electrode of the battery, and the extension cylinder can effectively lead out heat in the center of the core package; the heat dissipation speed of the core cladding is conveniently accelerated, the core cladding is prevented from being extruded towards the axis due to expansion, the problem of loosening or deformation of the core cladding is avoided, and the use performance of the battery is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylindrical battery structures, and more specifically relates to a cylindrical battery structure. Background Art

[0002] With the development of new energy vehicles, people have higher and higher requirements for vehicle endurance performance. At the same time, the requirements for battery fast charging performance are also gradually increasing, which puts higher requirements on the capacity and current carrying capacity of single batteries.

[0003] At present, cylindrical batteries mostly use full-ear technology to improve the battery's current capacity, and at the same time increase the battery capacity by increasing the battery size. However, when the battery is large in size, the difficulty of heat dissipation during high-rate charging and discharging increases further, especially for the middle position of the core pack, because the heat is difficult to dissipate in time, resulting in an increase in the temperature inside the core pack, which seriously affects the battery life. Utility Model Content

[0004] The purpose of the utility model is to provide a cylindrical battery structure, which can improve the heat dissipation capacity of the middle part of the battery core package without affecting the battery rate performance, avoid excessive temperature rise inside the core package, and extend the service life of the battery.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a cylindrical battery structure, including a shell, a core pack, an extension tube and a cover plate, the core pack is arranged in the shell, the cover plate is sealed on the top of the shell, a positive bus bar connected to the bottom wall of the cover plate is provided above the core pack, the extension tube is arranged along the axis of the core pack and passes through the core pack and the bottom wall of the shell, the extension tube has a downward lower opening, the outer periphery of the extension tube is sleeved with a negative bus bar connected to the negative ear at the bottom of the core pack, a first isolation component is provided between the extension tube and the bottom wall of the shell, the top of the extension tube is connected to a negative pole column that passes through the cover plate upward, and the outer periphery of the negative pole column is sleeved with a second isolation component that passes through the cover plate.

[0006] In one possible implementation, a center hole is provided on the bottom wall of the shell for the extension tube to pass through, a circumferentially extending positioning groove is provided on the inner circumferential wall of the center hole, a positioning step is provided at the lower end of the extension tube that can be positioned and cooperated with the positioning groove, and a first isolation component is arranged on the outer periphery of the extension tube for separating the extension tube from the shell and the negative electrode bus bar from the shell.

[0007] In one possible implementation, the first isolation assembly includes an isolation pad and an isolation tube connected to the bottom of the isolation pad. The isolation pad is sleeved on the outer periphery of the extension tube and is located between the negative electrode bus bar and the bottom wall of the shell. The isolation tube is sleeved on the outer periphery of the extension tube and the positioning step to separate the extension tube from the shell.

[0008] In some embodiments, the negative electrode column includes an integrally formed connection plate and a pole column body, the pole column body penetrates the cover plate, and the second isolation component is sleeved on the outer periphery of the pole column body.

[0009] In one possible implementation, the second isolation assembly includes an injection-molded sleeve sleeved around the outer periphery of the negative electrode column and a sealing ring sleeved around the lower portion of the negative electrode column. The lower end of the sealing ring is provided with a supporting pad extending toward the outer periphery, and the supporting pad is located between the cover plate and the connecting plate.

[0010] In some embodiments, a limiting ring protruding toward the axial center side of the injection molding sleeve is provided on the inner circumference of the injection molding sleeve, and a limiting groove engaged with the limiting ring is provided on the outer circumferential wall of the negative electrode column.

[0011] In some embodiments, an upper pressure ring extending toward the periphery is provided at the upper end of the injection molding sleeve, and the upper pressure ring is located above the cover plate.

[0012] In a possible implementation, a heat-conducting insulating adhesive is provided on the outer periphery of the extension tube, and a cooling pipeline is provided inside the extension tube.

[0013] In a possible implementation, the positive busbar includes a positive ring connected to the positive ear on the top of the core package and a connecting ring plate connected to the top wall of the cover plate, and the connecting ring plate is arranged close to the outer peripheral edge of the positive ring.

[0014] In some embodiments, a first positioning groove and a second positioning groove located in the inner circle of the first positioning groove are provided on the bottom surface of the cover plate, the first positioning groove is used to position and cooperate with the upper edge of the shell, and the second positioning groove is used to position and cooperate with the upper edge of the connecting ring plate.

[0015] Compared with the prior art, the solution shown in the embodiment of the present application provides a cylindrical battery structure, in which the positive busbar at the top of the core package is connected to the bottom wall of the cover plate, and the negative busbar at the bottom of the core package passes upward through the core package through an extension tube, and the negative electrode column at the top of the extension tube penetrates the cover plate to lead out the negative electrode of the battery. The extension tube can effectively lead out the heat at the center of the core package, which is convenient for accelerating the heat dissipation speed of the core package, preventing the core package from being squeezed toward the axis due to expansion, avoiding the problem of loose coiling or deformation of the core package, and improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0017] Figure 1 A schematic diagram of a front cross-sectional structure of a cylindrical battery structure provided by an embodiment of the utility model;

[0018] Figure 2 For the utility model embodiment Figure 1 The partially enlarged structural diagram of middle Ⅰ;

[0019] Figure 3 For the utility model embodiment Figure 1 Schematic diagram of the partial enlarged structure of middle Ⅱ;

[0020] Figure 4 For the utility model embodiment Figure 1 Schematic diagram of the partially enlarged structure of Figure Ⅲ.

[0021] Among them, the reference numerals in the figure are:

[0022] 1. Shell; 11. Positioning groove; 2. Core package; 3. Extension tube; 31. Positioning step; 32. Thermally conductive insulating glue; 33. Cooling pipeline; 4. Cover plate; 41. First positioning groove; 42. Second positioning groove; 5. Positive busbar; 51. Positive ring; 52. Connecting ring plate; 6. Negative busbar; 7. First isolation component; 71. Isolation pad; 72. Isolation tube; 8. Second isolation component; 81. Injection sleeve; 82. Sealing ring; 83. Support pad; 84. Limiting ring; 85. Upper pressure ring; 9. Negative pole; 91. Connecting plate; 92. Pole body; 93. Limiting groove. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0025] Please also read Figures 1 to 4 , the cylindrical battery structure provided by the utility model is now described. The cylindrical battery structure includes a shell 1, a core package 2, an extension tube 3 and a cover plate 4. The core package 2 is arranged in the shell 1, and the cover plate 4 is sealed on the top of the shell 1. A positive busbar 5 connected to the bottom wall of the cover plate 4 is arranged above the core package 2. The extension tube 3 is arranged along the axis of the core package 2 and penetrates the core package 2 and the bottom wall of the shell 1. The extension tube 3 has a downward lower opening. The outer periphery of the extension tube 3 is sleeved with a negative busbar 6 connected to the negative ear at the bottom of the core package 2. A first isolation component 7 is arranged between the extension tube 3 and the bottom wall of the shell 1. The top of the extension tube 3 is connected to a negative pole column 9 that penetrates the cover plate 4 upwards. The outer periphery of the negative pole column 9 is sleeved with a second isolation component 8 that penetrates the cover plate 4.

[0026] Compared with the prior art, the cylindrical battery structure provided in the present embodiment has a positive busbar 5 at the top of the core package 2 connected to the bottom wall of the cover plate 4, and a negative busbar 6 at the bottom of the core package 2 passes upward through the core package 2 through the extension tube 3. The negative electrode column 9 at the top of the extension tube 3 penetrates the cover plate 4 to lead out the negative electrode of the battery. The extension tube 3 can effectively lead out the heat at the center of the core package 2, which is convenient for accelerating the heat dissipation speed of the core package 2, preventing the core package 2 from being squeezed toward the axis due to expansion, avoiding the problem of loose curling or deformation of the core package 2, and improving the performance of the battery.

[0027] In this embodiment, the extension tube 3 is located at the central axis of the core package 2. A first through hole is provided at the center of the core package 2, which passes through the core package 2 from top to bottom. The outer diameter of the extension tube 3 is smaller than the inner diameter of the first through hole, and the diameter difference between the two is 0.5 mm to 1 mm. A second through hole is provided on the positive busbar 5 for the extension tube 3 to pass through. The second through hole is 6-10 mm larger than the first through hole, which is convenient for the extension tube 3 to pass through.

[0028] The bottom surface of the positive busbar 5 is welded to the positive electrode ear at the top of the core package 2, and the bottom surface of the negative busbar 6 is welded to the negative electrode ear at the bottom of the core package 2. The lower opening of the extension tube 3 is connected to the outside, and the heat at the center of the core package 2 can be smoothly discharged to achieve the cooling effect on the core package 2.

[0029] The above structure can realize the same-side lead-out of the positive and negative electrodes of the battery, thereby avoiding the loss caused by the current passing through the housing 1, shortening the current transmission path, and improving the energy utilization efficiency.

[0030] In one possible implementation, please also refer to Figures 1 to 4 A central hole is provided on the bottom wall of the shell 1 for the extension tube 3 to pass through, a circumferentially extending positioning groove 11 is provided on the inner circumferential wall of the central hole, a positioning step 31 which can be positioned and matched with the positioning groove 11 is provided at the lower end of the extension tube 3, and a first isolation component 7 is arranged on the outer periphery of the extension tube 3, for separating the extension tube 3 from the shell 1 and the negative electrode bus 6 from the shell 1.

[0031] In this embodiment, the positioning groove 11 provided at the bottom of the shell 1 is used to realize the positioning cooperation with the positioning step 31 at the lower part of the extension tube 3, thereby improving the positioning accuracy and the assembly efficiency. The first isolation component 7 is used to separate the shell 1 and the extension tube 3 as well as the shell 1 and the negative busbar 6, so as to meet the good isolation requirements and realize the separate extraction of the positive and negative electrodes of the battery. During installation, the extension tube 3 and the shell 1 are assembled as a whole by interference fit, which forms an extrusion effect on the first isolation component 7.

[0032] In one possible implementation, please also refer to Figures 1 to 4 The first isolation component 7 includes an isolation pad 71 and an isolation tube 72 connected to the bottom of the isolation pad 71. The isolation pad 71 is sleeved on the outer periphery of the extension tube 3 and is located between the negative electrode bus 6 and the bottom wall of the shell 1. The isolation tube 72 is sleeved on the outer periphery of the extension tube 3 and the positioning step 31, and is used to separate the extension tube 3 from the shell 1.

[0033] In this embodiment, the isolation pad 71 is used to separate the bottom of the negative busbar 6 from the inner bottom wall of the shell 1. The top surface of the negative busbar 6 is connected to the negative ear at the bottom of the core package 2, and extends to the top of the core package 2 through the extension tube 3. The negative pole 9 at the top of the extension tube 3 penetrates the cover plate 4 upward to form a negative electrode. The isolation tube 72 can keep the extension tube 3 and the shell 1 in an insulated state. The isolation tube 72 extends between the positioning groove 11 and the positioning step 31, meeting the requirements of good insulation and sealing.

[0034] In some embodiments, please refer to Figures 1 to 4 The negative electrode column 9 includes an integrally formed connection plate 91 and a pole column 92, the pole column 92 is set through the cover plate 4, and the second isolation component 8 is sleeved on the outer periphery of the pole column 92. The negative busbar 6 is composed of a connection plate 91 and a pole column 92, the connection plate 91 is a circular plate-shaped component, the thickness of the connection plate 91 is 0.5-1.5mm, the pole column 92 is connected to the top of the connection plate 91 and is set through the cover plate 4 upward, and the second isolation component 8 is used to achieve the insulation separation between the cover plate 4.

[0035] In one possible implementation, please also refer to Figures 1 to 4 The second isolation assembly 8 includes an injection molded sleeve 81 sleeved on the outer periphery of the negative electrode column 9 and a sealing ring 82 sleeved on the lower part of the negative electrode column 9. The lower end of the sealing ring 82 is provided with a supporting pad 83 extending toward the outer periphery. The supporting pad 83 is located between the cover plate 4 and the connecting plate 91.

[0036] In this embodiment, under the premise that the cover plate 4 is connected to the positive busbar 5, the second isolation assembly 8 effectively isolates the cover plate 4 and the negative electrode column 9, so that the positive and negative electrodes of the battery are effectively insulated and separated. The injection sleeve 81 is used to protect the upper part of the outer peripheral wall of the negative electrode column 9 to achieve its isolation from the cover plate 4, and the sealing ring 82 is used to protect the lower part of the outer peripheral wall of the negative electrode column 9. The support pad 83 can effectively separate the bottom surface of the upper cover plate 4 from the connecting plate 91.

[0037] In some embodiments, please refer to Figures 1 to 4 The inner periphery of the injection sleeve 81 is provided with a limiting ring 84 protruding toward the axial center side thereof, and the outer peripheral wall of the negative electrode column 9 is provided with a limiting groove 93 engaged with the limiting ring 84 .

[0038] In this embodiment, while the injection molding sleeve 81 is used to isolate the negative electrode column 9 and the cover plate 4, the limiting groove 93 of the negative electrode column 9 can be positioned and engaged with the limiting ring 84 on the inner circumference of the injection molding sleeve 81, thereby effectively limiting the axial position of the injection molding sleeve 81 and the negative electrode column 9.

[0039] In some embodiments, please refer to Figures 1 to 4 The upper end of the injection sleeve 81 is provided with an upper pressure ring 85 extending toward the periphery, and the upper pressure ring 85 is located above the cover plate 4. The upper end of the injection sleeve 81 is provided with an upper pressure ring 85, and the upper pressure ring 85 can be stacked above the cover plate 4 to ensure effective isolation of the cover plate 4 and the negative electrode column 9, meeting the isolation requirements of the positive and negative electrodes of the battery.

[0040] In one possible implementation, please also refer to Figures 1 to 4 The outer periphery of the extension tube 3 is provided with a heat-conducting insulating glue 32, and the extension tube 3 is provided with a cooling pipeline 33. The heat-conducting insulating glue 32 provided on the outer periphery of the extension tube 3 not only satisfies the insulation effect, but also realizes good thermal conductivity, so that the heat is transferred from the core package 2 to the extension tube 3, and is smoothly discharged through the lower opening of the extension tube 3.

[0041] On this basis, a cooling pipeline 33 may be further provided in the extension tube 3 , and the extension tube 3 may be cooled by the cooling pipeline 33 , thereby avoiding heat accumulation at the center of the core package 2 and ensuring effective heat dissipation of the core package 2 .

[0042] In one possible implementation, please also refer to Figures 1 to 4 The positive busbar 5 includes a positive ring 51 connected to the positive ear on the top of the core package 2 and a connecting ring plate 52 connected to the top wall of the cover plate 4 . The connecting ring plate 52 is arranged close to the outer peripheral edge of the positive ring 51 .

[0043] In this embodiment, the positive busbar 5 is composed of a positive ring 51 and a connecting ring plate 52. The positive ring 51 is a circular plate-shaped component. The connecting ring plate 52 provided on the positive ring 51 can be welded to the bottom surface of the cover plate 4, which improves the convenience of connection and ensures the reliability of connection. The thickness of the positive ring 51 is 0.5-1.5 mm. The connecting ring plate 52 is connected to the outer peripheral edge of the positive ring 51, extends upward by a height of 2-4 mm, and is connected to the bottom wall of the cover plate 4.

[0044] In some embodiments, please refer to Figures 1 to 4 The bottom surface of the cover plate 4 is provided with a first positioning groove 41 and a second positioning groove 42 located in the inner circle of the first positioning groove 41. The first positioning groove 41 is used to position and cooperate with the upper edge of the shell 1, and the second positioning groove 42 is used to position and cooperate with the upper edge of the connecting ring plate 52. In order to realize the positioning of the cover plate 4, the positive busbar 5 and the shell 1, the first positioning groove 41 and the second positioning groove 42 are provided on the bottom surface of the cover plate 4. The two are arranged adjacently, and the upper edges of the shell 1 and the connecting ring plate 52 can be structurally positioned respectively, thereby ensuring the installation accuracy of the battery.

[0045] Installation process:

[0046] Install the sealing ring 82 to the outer periphery of the negative pole 9, install the above-mentioned whole onto the cover plate 4, and use the injection molding process to form the injection sleeve 81 between the negative pole 9 and the cover plate 4. The positive and negative pole sheets are wound to form the core package 2, and the positive busbar 5 is welded to the positive pole ear at the top of the core package 2, and the connecting ring plate 52 of the positive busbar 5 is welded to the second positioning groove 42 on the cover plate 4. Pass the extension tube 3 through the core package 2, weld the negative busbar 6 to the negative pole ear at the bottom of the core package 2, weld the top of the extension tube 3 to the negative pole 9, install the second isolation component 8 to the bottom of the extension tube 3, and sleeve the shell 1 from the bottom to the outer periphery of the core package 2, so that the positioning groove 11 is positioned and matched with the positioning boss. Finally, weld the upper edge of the shell 1 to the first positioning groove 41 at the bottom of the cover plate 4. At this time, the second isolation component 8 is squeezed to ensure a good sealing effect, and the battery assembly is completed.

[0047] In the above cylindrical battery structure, the positive busbar 5 at the top of the core package 2 is connected to the bottom wall of the cover plate 4, and the negative busbar 6 at the bottom of the core package 2 passes through the core package 2 upward through the extension tube 3. The negative electrode column 9 at the top of the extension tube 3 penetrates the cover plate 4 to lead out the negative electrode of the battery. The extension tube 3 can effectively lead out the heat at the center of the core package 2, which is convenient for accelerating the heat dissipation speed of the core package 2, preventing the core package 2 from being squeezed toward the axis due to expansion, avoiding the problem of loose curling or deformation of the core package 2, and improving the performance of the battery.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Cylindrical battery structure, characterized in that: The invention comprises a shell (1), a core package (2), an extension tube (3) and a cover plate (4), wherein the core package (2) is arranged in the shell (1), the cover plate (4) is sealed on the top of the shell (1), a positive busbar (5) connected to the bottom wall of the cover plate (4) is arranged above the core package (2), the extension tube (3) is arranged along the axis of the core package (2) and penetrates the core package (2) and the bottom wall of the shell (1), the extension tube (3) has a downwardly facing lower opening, the outer periphery of the extension tube (3) is sleeved with a negative busbar (6) connected to the negative electrode ear at the bottom of the core package (2), a first isolation component (7) is arranged between the extension tube (3) and the bottom wall of the shell (1), the top of the extension tube (3) is connected to a negative electrode column (9) which penetrates upward through the cover plate (4), and the outer periphery of the negative electrode column (9) is sleeved with a second isolation component (8) which penetrates through the cover plate (4).

2. The cylindrical battery structure according to claim 1, characterized in that: The bottom wall of the shell (1) is provided with a center hole for the extension tube (3) to pass through, and the inner wall of the center hole is provided with a circumferentially extending positioning groove (11), and the lower end of the extension tube (3) is provided with a positioning step (31) capable of positioning and cooperating with the positioning groove (11), and the first isolation component (7) is arranged on the outer periphery of the extension tube (3) for separating the extension tube (3) from the shell (1) and the negative electrode busbar (6) from the shell (1).

3. The cylindrical battery structure according to claim 2, characterized in that: The first isolation assembly (7) comprises an isolation pad (71) and an isolation tube (72) connected to the bottom of the isolation pad (71); the isolation pad (71) is sleeved on the outer periphery of the extension tube (3) and is located between the negative electrode busbar (6) and the bottom wall of the shell (1); the isolation tube (72) is sleeved on the outer periphery of the extension tube (3) and the positioning step (31) and is used to separate the extension tube (3) from the shell (1).

4. The cylindrical battery structure according to claim 3, characterized in that: The negative pole (9) comprises an integrally formed connecting plate (91) and a pole body (92); the pole body (92) is arranged to penetrate the cover plate (4); and the second isolation component (8) is sleeved on the outer periphery of the pole body (92).

5. The cylindrical battery structure according to claim 4, characterized in that: The second isolation assembly (8) comprises an injection molded sleeve (81) sleeved on the outer periphery of the negative electrode column (9) and a sealing ring (82) sleeved on the lower part of the negative electrode column (9); a supporting pad (83) extending toward the outer periphery is provided at the lower end of the sealing ring (82); and the supporting pad (83) is located between the cover plate (4) and the connecting plate (91).

6. The cylindrical battery structure according to claim 5, characterized in that: The inner periphery of the injection molding sleeve (81) is provided with a limiting ring (84) protruding toward the axial center side thereof, and the outer peripheral wall of the negative electrode column (9) is provided with a limiting groove (93) engaged with the limiting ring (84).

7. The cylindrical battery structure according to claim 6, characterized in that: An upper pressure ring (85) extending toward the outer periphery is provided at the upper end of the injection sleeve (81), and the upper pressure ring (85) is located above the cover plate (4).

8. The cylindrical battery structure according to any one of claims 1 to 7, characterized in that: A heat-conducting insulating adhesive (32) is provided on the outer periphery of the extension tube (3), and a cooling pipeline (33) is provided inside the extension tube (3).

9. The cylindrical battery structure according to any one of claims 1 to 7, characterized in that: The positive electrode busbar (5) comprises a positive electrode ring (51) connected to the positive electrode ear at the top of the core package (2) and a connecting ring plate (52) connected to the top wall of the cover plate (4), wherein the connecting ring plate (52) is arranged close to the outer peripheral edge of the positive electrode ring (51).

10. The cylindrical battery structure according to claim 9, characterized in that: A first positioning groove (41) and a second positioning groove (42) located in the inner circle of the first positioning groove (41) are provided on the bottom surface of the cover plate (4); the first positioning groove (41) is used for positioning and cooperating with the upper edge of the shell (1); and the second positioning groove (42) is used for positioning and cooperating with the upper edge of the connecting ring plate (52).

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