All-tab battery structure

Abstract

The utility model provides a full-tab battery structure, which comprises a shell, a battery cell, a confluence piece and a cover plate, the confluence piece is arranged in the shell, a mounting hole is formed in the bottom wall of the shell in a penetrating manner, the confluence piece comprises a first connecting piece and a second connecting piece connected to one side of the first connecting piece, and the second connecting piece is connected to the other side of the first connecting piece. The second connecting piece extends to the lower portion of the shell through the mounting hole and is used for being connected with the outer bottom wall of the shell, and the cover plate is connected to the bottom of the shell and located below the convergence piece. According to the full-tab battery structure provided by the utility model, the first connecting piece of the confluence piece is connected with the bottom of the battery cell, the second connecting piece of the confluence piece downwards penetrates through the mounting hole, the first connecting piece can block the mounting hole by rotating the confluence piece in the circumferential direction, and the second connecting piece is connected with the lower bottom wall of the shell, so that the structure is simple in assembly process and high in reliability. The welding area of the confluence piece and the bottom of the shell is increased, energy loss caused by temperature rise of welding spots of the battery is reduced, the overcurrent capacity of the battery is improved, and the rate capability of the battery is improved.

Description

Technical Field

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

[0002] Follow With the rapid development of new energy vehicles, demands for battery life and fast charging are increasing, and therefore, the capacity and current handling requirements for individual cells are also increasing. Currently, cylindrical batteries use full-tab technology to improve their current handling capabilities. However, the welding area between the busbar and the bottom of the casing of existing full-tab batteries is relatively small, resulting in poor current handling. This in turn leads to high temperatures at the weld point, resulting in significant energy loss during battery output, and affecting the battery's rate performance. Utility Model Content

[0003] The purpose of the utility model is to provide a full-tab battery structure, which can effectively improve the assembly efficiency of the battery and increase the capacity of the battery.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: providing a full-tab battery structure, including a shell, a battery cell, a busbar and a cover plate, wherein the shell opening is upwardly arranged to accommodate the battery cell, the busbar is arranged in the shell and located below the battery cell, and the busbar is used to connect the battery cell and the shell;

[0005] Among them, a mounting hole is provided on the bottom wall of the shell, and the busbar includes a first connecting piece for connecting to the battery cell and a second connecting piece connected to one side of the first connecting piece. The second connecting piece extends to the bottom of the shell through the mounting hole and is used to be connected to the outer bottom wall of the shell. The busbar can rotate circumferentially so that the first connecting piece is sealed on the mounting hole and the second connecting piece is rotated to the bottom of the outer bottom wall of the shell. The cover plate is connected to the bottom of the shell and is located below the busbar.

[0006] In a possible implementation, a plurality of mounting holes are provided at intervals along the circumference of the housing, and a plurality of first connecting plates are also provided, and are arranged in a one-to-one correspondence with the mounting holes.

[0007] In a possible implementation, the busbar further includes a circular center plate, the first connecting plates are located on the periphery of the center plate and are spaced apart along the circumference of the center plate, and the inner peripheral edge of the first connecting plates is connected to the outer peripheral edge of the center plate.

[0008] In some embodiments, the mounting hole is fan-shaped, and the first connecting piece and the second connecting piece are both fan-shaped plate-like components.

[0009] In some embodiments, the rounded angles corresponding to the first connecting piece, the second connecting piece, and the mounting hole are respectively equal.

[0010] In a possible implementation, the diameter of the center plate is 0.5 to 0.8 times the diameter of the shell.

[0011] In a possible implementation, a receiving cavity for accommodating the second connecting piece is provided on the outer bottom wall of the shell, the receiving cavity is communicated with the mounting hole, and the top wall of the second connecting piece is connected to the bottom wall of the receiving cavity.

[0012] In a possible implementation, an installation cavity is further provided on the outer bottom wall of the shell, which is located below the accommodating cavity and communicated with the accommodating cavity, and the installation cavity is used to accommodate the cover plate.

[0013] In a possible implementation, the first connecting piece is connected to the second connecting piece via an upright portion provided in an up-down direction, and the upright portion passes through the mounting hole.

[0014] In a possible implementation, the cross-section of the shell is circular and the shell is made of aluminum.

[0015] Compared with the prior art, the solution shown in the embodiment of the present application is that the first connecting piece of the busbar is connected to the bottom of the battery cell, and the second connecting piece of the busbar passes downward through the mounting hole. By rotating the busbar circumferentially, the first connecting piece can block the mounting hole and the second connecting piece can be connected to the lower bottom wall of the shell, thereby optimizing the connection structure between the busbar and the shell, helping to improve assembly efficiency, and at the same time increasing the welding area between the busbar and the bottom of the shell, reducing the energy loss caused by the temperature rise of the battery solder joints, improving the battery's overcurrent capacity, and improving the battery's rate performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 embodiments or descriptions of the prior art. 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 any creative labor.

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

[0018] Figure 2 For the embodiment of the utility model Figure 1 Schematic diagram of the top view of the structure after the middle shell and busbar are installed;

[0019] Figure 3 For the embodiment of the utility model Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0020] Figure 4 For the embodiment of the utility model Figure 1 Schematic diagram of the top view of the middle busbar;

[0021] Figure 5 For the embodiment of the utility model Figure 4 Schematic diagram of the cross-sectional structure of the middle BB;

[0022] Figure 6 For the embodiment of the utility model Figure 1 A schematic diagram of the top view of the middle shell;

[0023] Figure 7 For the embodiment of the utility model Figure 6 Schematic diagram of the cross-sectional structure of CC;

[0024] Figure 8 For the embodiment of the utility model Figure 6 Schematic diagram of the structure of the middle shell from a bottom view.

[0025] Among them, the reference numerals in the figures are:

[0026] 1. Housing; 11. Mounting hole; 12. Accommodating cavity; 13. Mounting cavity; 2. Battery cell; 3. Busbar; 31. First connecting piece; 32. Second connecting piece; 33. Center plate; 34. Upright portion; 4. Cover plate. DETAILED DESCRIPTION

[0027] 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 with reference to 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 intended to limit the present invention.

[0028] 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 terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 present invention. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "several" means two or more, unless otherwise clearly and specifically defined.

[0029] Please also refer to Figures 1 to 8 The full-tab battery structure provided by the present invention is now described. The full-tab battery structure includes a housing 1, a battery cell 2, a busbar 3, and a cover plate 4. The housing 1 is opened upward and is used to accommodate the battery cell 2. The busbar 3 is arranged in the housing 1 and is located below the battery cell 2. The busbar 3 is used to connect the battery cell 2 to the housing 1.

[0030] Among them, a mounting hole 11 is provided on the bottom wall of the shell 1, and the busbar 3 includes a first connecting piece 31 for connecting to the battery core 2 and a second connecting piece 32 connected to one side of the first connecting piece 31. The second connecting piece 32 extends to the bottom of the shell 1 through the mounting hole 11 and is used to be connected to the outer bottom wall of the shell 1. The busbar 3 can rotate circumferentially so that the first connecting piece 31 is sealed on the mounting hole 11 and the second connecting piece 32 is rotated to the bottom of the outer bottom wall of the shell 1. The cover plate 4 is connected to the bottom of the shell 1 and is located below the busbar 3.

[0031] The full-tab battery structure provided in this embodiment is compared with the prior art. In the full-tab battery structure provided in this embodiment, the first connecting piece 31 of the busbar 3 is connected to the bottom of the battery cell 2, and the second connecting piece 32 of the busbar 3 passes downward through the mounting hole 11. The first connecting piece 31 is sealed on the mounting hole 11 by circumferentially rotating the busbar 3, and the second connecting piece 32 is connected to the lower bottom wall of the shell 1. The above structure optimizes the connection structure between the busbar 3 and the shell 1, helps to improve assembly efficiency, and at the same time increases the welding area between the busbar 3 and the bottom of the shell 1, reduces the energy loss caused by the temperature rise of the battery solder joints, improves the battery overcurrent capacity, and enhances the battery rate performance.

[0032] In this embodiment, the positive and negative pole pieces are first wound into a battery core 2, and then the bottom wall of the battery core 2 is welded to the top wall of the first connecting piece 31 of the bus bar 3. Then, the battery core 2 and the bus bar 3 are placed as a whole in the shell 1, and the second connecting piece 32 is correspondingly located in the mounting hole 11. The bus bar 3 is driven to rotate circumferentially by rotating the battery core 2 until the second connecting piece 32 rotates to a position that fits the bottom wall of the shell 1. Then, the second connecting piece 32 is welded to the outer bottom wall of the shell 1, and finally, the cover plate 4 is sealed to the bottom of the shell 1 to complete the installation of the battery bottom structure. The upper opening of the shell 1 adopts the existing installation method.

[0033] Specifically, when connecting the battery cell 2 to the busbar 3, to facilitate welding, the battery cell 2 can be inverted, and then the first connecting piece 31 of the busbar 3 can be inverted and placed above the battery cell 2 for welding. Similarly, when welding the second connecting piece 32 to the bottom wall of the housing 1, the battery cell 2, housing 1, and busbar 3 can be inverted as a whole and then welded together.

[0034] In addition, when the battery cell 2 and the busbar 3 are driven to rotate circumferentially as a whole, the second connecting piece 32 should be in maximum contact with the outer bottom wall of the housing 1 to maximize the contact area between the two, that is, to ensure the maximum welding area.

[0035] In one possible implementation, see Figures 1 to 8 A plurality of mounting holes 11 are provided at intervals along the circumference of the housing 1 , and a plurality of first connecting pieces 31 are also provided, and are arranged in a one-to-one correspondence with the mounting holes 11 .

[0036] In this embodiment, a plurality of mounting holes 11 are provided on the bottom wall of the shell 1, and the mounting holes 11 are respectively blocked by a plurality of first connecting pieces 31 on the bus bar 3, and the plurality of first connecting pieces 31 are connected to the bottom surface of the battery core 2, and are adhered to and connected to the outer bottom wall of the shell 1 through a plurality of second connecting pieces 32 on the bus bar 3, thereby finally realizing the respective connection between the bus bar 3 and the battery core 2 and the shell 1.

[0037] Multiple second connecting pieces 32 are connected one by one to the same side of multiple first connecting pieces 31. The above-mentioned same side can ensure that when the bus bar 3 rotates circumferentially, the multiple first connecting pieces 31 can rotate synchronously in the clockwise direction or synchronously in the counterclockwise direction, ensuring the synchronous movement of the multiple first connecting pieces 31 and the second connecting pieces 32, and realizing rapid installation between the bus bar 3 and the shell 1.

[0038] Specifically, three mounting holes 11 are provided, spaced apart along the circumference of the housing 1, and three first connecting pieces 31 are provided, spaced apart along the circumference of the center plate 33. This selection and arrangement of the number of first connecting pieces 31 not only meets the connection area requirements between the busbar 3 and the battery cell 2 or the housing 1, but also ensures that the housing 1 has sufficient structural strength, facilitates structural assembly, and helps improve assembly efficiency.

[0039] In one possible implementation, see Figures 1 to 8 The busbar 3 also includes a circular center plate 33 , the first connecting pieces 31 are located on the periphery of the center plate 33 and are spaced apart along the circumference of the center plate 33 , and the inner peripheral edge of the first connecting piece 31 is connected to the outer peripheral edge of the center plate 33 .

[0040] In this embodiment, a center plate 33 is further provided in the middle of the busbar 3. The circular center plate 33 is connected to the first connecting piece 31, so that the plurality of first connecting pieces 31 and the center plate 33 together form the entire busbar 3. Specifically, the inner peripheral edge of the first connecting piece 31 is connected to the outer peripheral edge of the center plate 33, and the second connecting piece 32 is connected to the side of the first connecting piece 31 and is not connected to the center plate 33. The second connecting piece 32 can be configured to gradually extend downward and away from the first connecting piece 31, or it can be configured to be connected to the first connecting piece 31 via an upright plate-like member. In either case, the first connecting piece 31 can extend through the mounting hole 11 to the bottom of the housing 1, achieving effective connection with the bottom wall of the housing 1.

[0041] For some examples, see Figures 1 to 8 The mounting hole 11 is in the form of a fan-shaped ring, and the first connecting piece 31 and the second connecting piece 32 are both fan-shaped plate-like components. The fan-shaped mounting hole 11 and the fan-shaped first connecting piece 31 and the second connecting piece 32 are both arranged in fan-shaped rings, so that the mounting hole 11 and the second connecting piece 32 can effectively correspond to each other, allowing the second connecting piece 32 to smoothly extend to the bottom of the housing 1. This also facilitates the alignment of the hole patterns of the first connecting piece 31 and the mounting hole 11.

[0042] Furthermore, the circular angles corresponding to the first connecting piece 31, the second connecting piece 32 and the mounting hole 11 are respectively equal, so that the mounting hole 11 provides a passage space for the second connecting piece 32, and it is also convenient to use the first connecting piece 31 to effectively block the mounting hole 11 to ensure the sealing performance inside the shell 1.

[0043] In one possible implementation, see Figures 1 to 8 The diameter of the center plate 33 is 0.5 to 0.8 times the diameter of the housing 1. This ensures that the center plate 33 has sufficient supporting area and enables the outer edge of the center plate 33 to be reliably connected to the inner edge of the first connecting piece 31, thereby improving the structural stability of the busbar 3.

[0044] At the same time, the positions on the shell 1 corresponding to the upper and lower parts of the center plate 33 are also solid structures, that is, the setting position of the accommodating cavity 12 should correspond to the outer periphery of the center plate 33 to ensure the overall structural strength of the shell 1 and meet the subsequent connection requirements with the second connecting plate 32.

[0045] In one possible implementation, see Figures 1 to 8The outer bottom wall of the housing 1 is provided with a cavity 12 for accommodating the second connecting piece 32. The cavity 12 is in communication with the mounting hole 11, and the top wall of the second connecting piece 32 is connected to the bottom wall of the cavity 12. The arrangement of the cavity 12 provides ample space for the arrangement of the second connecting piece 32, preventing the second connecting piece 32 from protruding downward from the bottom wall of the housing 1, thereby achieving a reasonable structural layout.

[0046] For details, please refer to Figures 1 to 3 The thickness of the second connecting piece 32 is equal to the depth of the accommodating cavity 12, so that the bottom wall of the second connecting piece 32 is flush with the outer bottom wall of the housing 1. The thickness of the second connecting piece 32 meets the space requirements of the accommodating cavity 12, so that the bottom wall of the entire housing 1 is flush after the busbar 3 is installed, improving the overall aesthetics of the structure and facilitating the placement of the housing 1.

[0047] In one possible implementation, see Figures 1 to 8 An installation cavity 13 is further provided on the outer bottom wall of the shell 1 and is located below the accommodating cavity 12 and communicated with the accommodating cavity 12 . The installation cavity 13 is used to accommodate the cover plate 4 .

[0048] In one possible implementation, see Figures 1 to 8 The first connecting piece 31 is connected to the second connecting piece 32 through an upright portion 34 arranged along the up-down direction, and the upright portion 34 is arranged through the mounting hole 11.

[0049] In this embodiment, the upright portion 34 can reliably connect the first connecting piece 31 and the second connecting piece 32, and the three can be formed by bending sheet metal. When the busbar 3 rotates, the upright portion moves from a position in contact with one side edge of the mounting hole 11 to a position in contact with the other side edge of the mounting hole 11. At the same time, the first connecting piece 31 moves from one side of the mounting hole 11 of the housing 1 to block directly above the mounting hole 11, and the second connecting piece 32 moves to contact the bottom wall of the accommodating cavity 12 to facilitate subsequent welding. The above-mentioned installation method effectively improves the operational convenience of the assembly process. The upright portion 34 can be used to limit the rotation range of the busbar 3, which is convenient for one-time installation and effectively improves assembly efficiency.

[0050] In one possible implementation, see Figures 1 to 8 The housing 1 has a circular cross-section and is made of aluminum. The circular shape of the housing facilitates the accommodation of the wound circular battery cell 2. Furthermore, the aluminum housing 1 has excellent thermal and electrical conductivity, along with its lightweight, corrosion-resistant, and high-temperature resistance advantages, thereby enhancing the overall performance of the battery.

[0051] In the above-mentioned full-tab battery structure, the first connecting piece 31 of the busbar 3 is connected to the bottom of the battery cell 2, and the second connecting piece 32 of the busbar 3 passes downward through the mounting hole 11 and rotates circumferentially so as to be connected to the lower bottom wall of the shell 1, thereby optimizing the connection structure between the busbar 3 and the shell 1, reducing the internal space occupied by the shell 1, and at the same time reducing the distance between the battery cell 2 and the cover plate 4, thereby improving the overall capacity of the battery while ensuring the rate. In addition, the assembly process of the above-mentioned structure is simple, which is convenient for reducing the difficulty of assembly and improving the assembly efficiency.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Full-ear battery structure, characterized in that: The battery comprises a shell (1), a battery cell (2), a busbar (3) and a cover plate (4); the shell (1) is opened upward and is used to accommodate the battery cell (2); the busbar (3) is arranged in the shell (1) and is located below the battery cell (2); the busbar (3) is used to connect the battery cell (2) and the shell (1); The bottom wall of the shell (1) is provided with a mounting hole (11), the busbar (3) comprises a first connecting piece (31) for connecting to the battery core (2) and a second connecting piece (32) connected to one side of the first connecting piece (31), the second connecting piece (32) extending through the mounting hole (11) to the bottom of the shell (1) and connected to the outer bottom wall of the shell (1), the busbar (3) can rotate circumferentially so that the first connecting piece (31) is blocked on the mounting hole (11) and the second connecting piece (32) is rotated to the bottom of the outer bottom wall of the shell (1), and the cover plate (4) is connected to the bottom of the shell (1) and is located below the busbar (3).

2. The full-tab battery structure according to claim 1, characterized in that: A plurality of the mounting holes (11) are arranged at intervals along the circumference of the housing (1), and a plurality of the first connecting pieces (31) are also arranged in a one-to-one correspondence with the mounting holes (11).

3. The full-tab battery structure according to claim 2, characterized in that: The busbar (3) further comprises a circular center plate (33), the first connecting plates (31) being located on the periphery of the center plate (33) and spaced apart along the circumference of the center plate (33), and the inner peripheral edge of the first connecting plates (31) being connected to the outer peripheral edge of the center plate (33).

4. The full-tab battery structure according to claim 3, characterized in that: The mounting hole (11) is in the shape of a fan ring, and the first connecting piece (31) and the second connecting piece (32) are both fan ring-shaped plate-like components.

5. The full-tab battery structure according to claim 4, characterized in that: The circular angles corresponding to the first connecting piece (31), the second connecting piece (32) and the mounting hole (11) are respectively equal.

6. The full-tab battery structure according to claim 3, characterized in that: The diameter of the center plate (33) is 0.5 to 0.8 times the diameter of the shell (1).

7. The full-tab battery structure according to any one of claims 1 to 6, characterized in that: An accommodating cavity (12) for accommodating the second connecting piece (32) is provided on the outer bottom wall of the shell (1); the accommodating cavity (12) is communicated with the mounting hole (11); and the top wall of the second connecting piece (32) is connected to the bottom wall of the accommodating cavity (12).

8. The full-tab battery structure according to claim 7, characterized in that: The outer bottom wall of the shell (1) is also provided with an installation cavity (13) located below the accommodating cavity (12) and communicated with the accommodating cavity (12); the installation cavity (13) is used to accommodate the cover plate (4).

9. The full-tab battery structure according to any one of claims 1 to 6, characterized in that: The first connecting piece (31) is connected to the second connecting piece (32) via an upright portion (34) arranged in the up-down direction, and the upright portion (34) is arranged to pass through the mounting hole (11).

10. The full-tab battery structure according to any one of claims 1 to 6, characterized in that: The shell (1) has a circular cross-section and is made of aluminum.

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