Battery connection structure and full-tab battery
By adopting a structure in which the electrode ear bends to the outer periphery in the battery, the welding area between the electrode ear and the busbar is increased, and the problems of insufficient overcurrent capacity and short circuit of the existing battery are solved, and the process yield and product quality of the battery are improved.
Patent Information
- Application Number
- CN202421630860.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The welding area between the pole ears and busbars of existing batteries is limited, resulting in insufficient overcurrent capacity, and the welding method is prone to short-circuiting of the battery, affecting product quality.
The structure of the electrode ear bent to the outer periphery is adopted to increase the welding area between the electrode ear and the busbar, increase the number of electrode ears that can be welded, and connect it to the pole column through the second busbar, achieving effective extraction of the two poles of the battery.
It improves the battery's overcurrent capability, reduces the risk of battery short circuit caused by welding blasting points, and improves the battery's process yield and product quality.
Smart Images
Figure CN222867996U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of full-tab batteries, and more specifically, relates to a battery connection structure and a full-tab battery. Background Art
[0002] With the development of new energy technology, new energy vehicles are increasingly used in people's lives. People's requirements for fast charging of vehicles are also increasing. In existing vehicles, cylindrical battery structures are mostly used. Cylindrical batteries are generally designed as full-ear structures to improve the battery's current capacity.
[0003] At present, although the battery cells of existing batteries are full-ear, the area where the ear and the busbar are welded together is limited, and the number of ear that can be welded together with the busbar is also limited, which greatly reduces the battery's current capacity. At the same time, the above welding method is prone to explosion points, damage to the diaphragm and cause battery short circuit, and the battery process defect rate is high, affecting the product quality of cylindrical batteries. Utility Model Content
[0004] The purpose of the utility model is to provide a battery connection structure and a full-tab battery, which can effectively increase the welding area between the tab and the busbar, increase the number of tabs welded to the busbar, and facilitate improving the product quality of the battery and improving the current carrying capacity of the battery.
[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a battery connection structure, including a core package, an upper busbar assembly and a cover plate, the top of the core package is provided with a pole ear that bends and extends toward the outer periphery, the upper busbar assembly includes a first busbar mounted on the lower periphery of the pole ear and a second busbar connected to the top of the pole ear, the first busbar is arranged above the core package and connected to the bottom surface of the pole ear, and the second busbar is connected to the cover plate.
[0006] In a possible implementation, the first busbar has a circumferential groove with an opening toward the outer periphery and extending in the circumferential direction, and the inner periphery of the first busbar is provided with an arc-shaped transition portion adjacent to the pole lug.
[0007] In some embodiments, the outer peripheral edge of the first bus bar is flush with the outer peripheral edge of the tab, and the outer peripheral wall of the second bus bar is flush with the outer peripheral edge of the tab.
[0008] In some embodiments, the core package is arranged to protrude outward from the peripheral edge of the pole lug, and the distance between the peripheral edge of the pole lug and the peripheral wall of the core package is 3 mm-5 mm.
[0009] In a possible implementation, a center hole is penetrated through the second busbar, and an arc-shaped plate capable of fitting with the tab is connected to the second busbar, and the arc-shaped plate extends in an arc shape below the axis of the center hole.
[0010] In a possible implementation, a connecting ring plate extending upward is provided on the outer periphery of the second busbar, and an upper edge of the connecting ring plate is connected to the bottom wall of the cover plate.
[0011] In some embodiments, a circumferentially extending mounting groove is provided on the bottom surface of the cover plate, and the connecting ring plate extends upward to be connected to the groove top wall of the mounting groove.
[0012] Compared with the prior art, the scheme shown in the embodiment of the present application adopts a structure in which the pole ear is bent and extended toward the periphery, and the second bus bar and the first bus bar are respectively located on the upper and lower sides of the bent pole ear, and are connected to the top and bottom of the pole ear, thereby effectively increasing the welding area between the pole ear and the second bus bar and the first bus bar, and increasing the number of pole ears that can be welded, thereby improving the current carrying capacity of the structure, and at the same time avoiding battery short circuit caused by welding explosion points between the upper bus bar assembly and the pole ear, thereby improving the process yield of the battery.
[0013] The utility model also provides a full-ear battery, which includes a shell, a pole, an isolation sleeve, a lower busbar and a battery connection structure. The core package is arranged in the shell, the pole passes through the cover plate, the isolation sleeve is arranged on the outer periphery of the pole and is used to separate the pole and the cover plate, the lower end of the lower busbar is connected to another group of pole ears at the bottom of the core package, and the upper end of the lower busbar is connected to the bottom of the pole.
[0014] In a possible implementation, a circumferentially extending positioning groove is provided on the bottom wall of the cover plate, the positioning groove is arranged to penetrate outwardly through the circumferential wall of the cover plate, and the upper edge of the shell is connected to the groove top wall of the positioning groove.
[0015] In some embodiments, a connecting plate extending horizontally and connected to the lower busbar is provided at the lower end of the pole, and a partition extending toward the periphery is provided at the lower end of the isolation sleeve, and the partition protrudes toward the periphery from the connecting plate.
[0016] Compared with the prior art, the solution shown in the embodiment of the present application is that one of the pole ears adopts a structure that bends and extends toward the periphery and is welded to the upper busbar assembly, which effectively increases the welding area between the pole ear and the upper busbar assembly, increases the number of pole ears that can be welded, and thus improves the current carrying capacity of the structure. At the same time, it can also avoid battery short circuit caused by welding explosion points between the upper busbar assembly and the pole ear, thereby improving the process yield of the battery. The other pole ear is connected to the pole through the lower busbar to achieve effective lead-out of the two poles of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] 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.
[0018] Figure 1 A schematic diagram of a battery connection structure provided by an embodiment of the utility model;
[0019] Figure 2 For the utility model embodiment Figure 1 The partially enlarged structural diagram of middle Ⅰ;
[0020] Figure 3 A partial front view cross-sectional structure diagram of a full-tab battery provided in an embodiment of the utility model;
[0021] Figure 4 For the utility model embodiment Figure 3 Schematic diagram of the partially enlarged structure of II.
[0022] Among them, the reference numerals in the figure are:
[0023] 1. Core package; 11. Pole ear; 2. First busbar; 21. Circumferential groove; 22. Arc transition portion; 3. Second busbar; 31. Connecting ring plate; 32. Arc plate; 4. Cover plate; 41. Mounting groove; 42. Positioning groove; 5. Shell; 6. Pole; 61. Connecting plate; 7. Isolation sleeve; 71. Partition; 8. Lower busbar. DETAILED DESCRIPTION
[0024] 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.
[0025] 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.
[0026] Please also read Figures 1 to 4 The battery connection structure and the full-tab battery provided by the utility model are now described. The battery connection structure includes a core pack 1, an upper busbar assembly and a cover plate 4. The top of the core pack 1 is provided with a tab 11 that bends and extends toward the periphery. The upper busbar assembly includes a first busbar 2 sleeved on the lower periphery of the tab 11 and a second busbar 3 connected to the top of the tab 11. The first busbar 2 is arranged above the core pack 1 and connected to the bottom surface of the tab 11. The second busbar 3 is connected to the cover plate 4. Compared with the prior art, the battery connection structure provided in the present embodiment has a structure in which the pole ear 11 is bent and extended toward the periphery, and the second bus bar 3 and the first bus bar 2 are respectively located on the upper and lower sides of the bent pole ear 11, and are connected to the top and bottom of the pole ear 11, thereby effectively increasing the welding area between the pole ear 11 and the second bus bar 3 and the first bus bar 2, and increasing the number of pole ears 11 that can be welded, thereby improving the current carrying capacity of the structure, and at the same time avoiding battery short circuit caused by welding explosion points between the upper bus bar assembly and the pole ear 11, thereby improving the process yield of the battery.
[0027] In this embodiment, the tab 11 can be a positive tab 11 or a negative tab 11, and one of them can be selected and connected in the above connection method during installation. When the tab 11 is a positive tab 11, the negative tab 11 can be led out from the bottom of the core package 1, and led upward from the center of the core package 1 by means of a cylindrical or columnar member to be connected to the pole 6 in the middle of the cover plate 4. In addition, the negative tab 11 can also be led out from the top of the core package 1, located at the inner circle of the positive tab 11.
[0028] When the above-mentioned pole ear 11 is a negative pole ear 11, the positive pole ear 11 can be led out from the bottom of the core package 1, and led upward from the center of the core package 1 by means of a cylindrical or columnar component to be connected to the pole 6 in the middle of the cover plate 4. In addition, the positive pole ear 11 can also be led out from the top of the core package 1, located at the inner circle of the negative pole ear 11.
[0029] It should be noted that a separator made of insulating material should be provided between the cover plate 4 and the pole 6 to ensure insulation between the two.
[0030] The pole lug 11 above the core package 1 is bent and extended toward the periphery to form a nearly annular component. The second busbar 3 and the first busbar 2 are clamped on the upper and lower sides of the pole lug 11 respectively and are welded to the pole lug 11. The top and bottom of the pole lug 11 have a large welding area, which helps to enhance the current carrying capacity of the structure.
[0031] In one possible implementation, see Figures 1 to 4 The first busbar 2 has a circumferential groove 21 with an opening toward the outer periphery and extending in the circumferential direction. The inner periphery of the first busbar 2 is provided with an arc-shaped transition portion 22 adjacent to the pole lug 11 .
[0032] In this embodiment, a circumferential groove 21 is formed on the first bus bar 2. The first bus bar 2 can be formed by bending a plate-like component. The setting of the arc-shaped transition portion 22 can achieve effective avoidance of the lower peripheral portion of the pole lug 11, meet the space requirement for bending the pole lug 11, and at the same time form an arc similar to the bending angle of the pole lug 11, thereby avoiding rigid interference between the first bus bar 2 and the pole lug 11.
[0033] For some examples, see Figures 1 to 4 , the outer peripheral edge of the first busbar 2 is flush with the outer peripheral edge of the pole lug 11, and the outer peripheral wall of the second busbar 3 is flush with the outer peripheral edge of the pole lug 11. The outer peripheral edge of the first busbar 2 is flush with the outer peripheral edge of the pole lug 11, so that the two are fully in contact and welded together, increasing the welding area. At the same time, the outer peripheral edge of the pole lug 11 is flush with the outer peripheral wall of the second busbar 3, so that the two are fully in contact and welded together, which helps to increase the welding area. The pole lug 11 is in close contact with the second busbar 3 and the first busbar 2, achieving the effect of full pole lug 11 overcurrent, avoiding battery short circuit caused by welding explosion points, and improving the battery process yield.
[0034] For some examples, see Figures 1 to 4The core package 1 is arranged to protrude outward from the outer peripheral edge of the pole lug 11, and the distance between the outer peripheral edge of the pole lug 11 and the peripheral wall of the core package 1 is 3mm-5mm. There is a gap between the outer peripheral edge of the pole lug 11 and the inner wall of the shell 5, and the gap value is 3mm-5mm, which realizes full avoidance of the structure. The bending thickness height of multiple pole lugs 11 is kept consistent as much as possible, and the height of the pole lug 11 can be set to 1.2-1.6 times the radius of the core package 1, which can not only meet the welding area requirements, but also avoid position interference with structures such as the shell 5.
[0035] In one possible implementation, see Figures 1 to 4 A center hole is penetrated through the second busbar 3, and an arc plate 32 that can fit with the pole ear 11 is connected to the second busbar 3, and the arc plate 32 extends in an arc shape below the axis of the center hole.
[0036] In this embodiment, a center hole is provided on the second busbar 3, and the second busbar 3 is an annular plate-shaped component with a thickness of about 1-2 mm. The center hole corresponds to the center of the pole lug 11, which is convenient for the subsequent arrangement of the cylindrical or columnar component. The arc plate 32 on the second busbar 3 can effectively fit with the arc area after the pole lug 11 is bent, thereby improving the degree of fit between the two, increasing the welding area between the two, and improving the battery's current capacity.
[0037] In one possible implementation, see Figures 1 to 4 The outer periphery of the second busbar 3 is provided with a connecting ring plate 31 extending upward, and the upper edge of the connecting ring plate 31 is connected to the bottom wall of the cover plate 4. The connecting ring plate 31 on the second busbar 3 is used to connect to the bottom wall of the cover plate 4, and the connecting ring plate 31 can be enclosed to form a cylindrical structure. The plate surface of the connecting ring plate 31 is arranged perpendicular to the plate surface of the second busbar 3, and the connecting ring plate 31 can achieve electrical communication with the cover plate 4.
[0038] For some examples, see Figures 1 to 4 The bottom surface of the cover plate 4 is provided with a circumferentially extending mounting groove 41, and the connecting ring plate 31 extends upward to be connected with the groove top wall of the mounting groove 41. The mounting groove 41 provided on the bottom wall of the cover plate 4 is used to position and install the connecting ring plate 31, so that the upper edge of the connecting ring plate 31 is connected to the groove top wall of the mounting groove 41, thereby improving the positioning accuracy, reducing the installation difficulty of the structure, and helping to improve the installation efficiency.
[0039] Installation process:
[0040] While the core package 1 is being wound, the pole tab 11 is turned outward. After the winding is completed, the first busbar 2 is installed to the lower periphery of the pole tab 11 so that the first busbar 2 is located above the core package 1. Then the second busbar 3 is installed, and the upper pole tab 11 is in close contact with the upper first busbar 2. Finally, continuous laser welding is used to weld and connect all the pole tabs 11, the second busbar 3 and the first busbar 2. Due to the setting of the circumferential groove 21 on the first busbar 2, the battery short circuit caused by the welding explosion point can be prevented, which helps to improve the process yield of the battery. Finally, the second busbar 3 and the cover plate 4 are welded to complete the conductive connection between the second busbar 3 and the cover plate 4. Based on the same inventive concept, an embodiment of the present application also provides a full-tab battery, which includes a shell 5, a pole 6, an isolation sleeve 7, a lower busbar 8 and a battery connection structure. The core pack 1 is arranged in the shell 5, the pole 6 passes through the cover plate 4, the isolation sleeve 7 is sleeved on the outer periphery of the pole 6 and is used to separate the pole 6 from the cover plate 4, the lower end of the lower busbar 8 is connected to another group of pole tabs at the bottom of the core pack 1, and the upper end of the lower busbar 8 is connected to the bottom of the pole 6.
[0041] On the basis of connecting one set of pole ears 11 by using the above-mentioned battery connection structure, the lower busbar 8 is used to connect with another set of pole ears at the bottom of the core package 1. The lower busbar 8 is connected to the pole 6, so that the battery can synchronously lead out the positive and negative poles to meet the required functions of the battery.
[0042] After completing the above-mentioned battery connection structure, the lower busbar 8 is passed through the core pack 1, the first busbar 2, the tab 11 and the second busbar 3 to be connected to the bottom of the pole 6. Finally, the shell 5 is installed from the bottom of the core pack 1, and the shell 5 and the cover plate 4 are connected to complete the installation process of the full-tab battery.
[0043] In one possible implementation, see Figures 1 to 4 The bottom wall of the cover plate 4 is provided with a circumferentially extending positioning groove 42, which is arranged to penetrate the circumferential wall of the cover plate 4 outwardly, and the upper edge of the shell 5 is connected to the groove top wall of the positioning groove 42. The positioning groove 42 on the cover plate 4 can be positioned and connected with the upper edge of the shell 5, which can effectively improve the installation efficiency of the shell 5, ensure the effective limitation of the relative position of the shell 5 and the cover plate 4, and improve the dimensional accuracy of the installation structure.
[0044] For some examples, see Figures 1 to 4 The lower end of the pole 6 is provided with a connecting plate 61 extending horizontally and connected to the lower busbar 8, and the lower end of the isolation sleeve 7 is provided with a partition 71 extending toward the periphery, and the partition 71 is provided protruding toward the periphery from the connecting plate 61. The edge of the connecting plate 61 provided at the lower end of the pole 6 is connected to the top wall of the lower busbar 8. The isolation sleeve 7 is used to separate the cover plate 4 and the pole 6. The partition 71 provided at the lower end of the isolation sleeve 7 can effectively separate the connecting plate 61 and the cover plate 4, so as to meet the normal use function of the battery.
[0045] The full-ear battery provided in this embodiment has one ear 11 that is bent and extended toward the periphery and is welded to the upper busbar assembly, which effectively increases the welding area between the ear 11 and the upper busbar assembly, increases the number of ears 11 that can be welded, and thus improves the current carrying capacity of the structure. At the same time, it can also avoid battery short circuit caused by welding explosion points between the upper busbar assembly and the ear 11, thereby improving the process yield of the battery. The other ear 11 is connected to the pole 6 through the lower busbar 8 to achieve effective lead-out of the two poles of the battery.
[0046] 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. A battery connection structure, characterized in that: The invention comprises a core package (1), an upper busbar assembly and a cover plate (4); the top of the core package (1) is provided with a pole ear (11) bent and extended toward the outer periphery; the upper busbar assembly comprises a first busbar (2) sleeved on the lower outer periphery of the pole ear (11) and a second busbar (3) connected to the upper part of the pole ear (11); the first busbar (2) is arranged above the core package (1) and connected to the bottom surface of the pole ear (11); the second busbar (3) is connected to the cover plate (4).
2. The battery connection structure according to claim 1, characterized in that: The first busbar (2) has a circumferential groove (21) which is opened toward the outer periphery and extends in the circumferential direction, and the inner periphery of the first busbar (2) is provided with an arc-shaped transition portion (22) which is adjacent to the pole lug (11).
3. The battery connection structure according to claim 2, characterized in that: The outer peripheral edge of the first busbar (2) is flush with the outer peripheral edge of the pole lug (11), and the outer peripheral wall of the second busbar (3) is flush with the outer peripheral edge of the pole lug (11).
4. The battery connection structure according to claim 3, characterized in that: The core package (1) is arranged to protrude outward from the outer peripheral edge of the pole lug (11), and the distance between the outer peripheral edge of the pole lug (11) and the peripheral wall of the core package (1) is 3 mm to 5 mm.
5. The battery connection structure according to claim 1, characterized in that: The second busbar (3) is provided with a central hole, and the second busbar (3) is connected with an arc-shaped plate (32) capable of being fitted with the pole lug (11), and the arc-shaped plate (32) extends in an arc shape below the axis of the central hole.
6. The battery connection structure according to claim 1, characterized in that: The outer periphery of the second busbar (3) is provided with a connecting ring plate (31) extending upwards, and the upper edge of the connecting ring plate (31) is connected to the bottom wall of the cover plate (4).
7. The battery connection structure according to claim 6, characterized in that: A circumferentially extending mounting groove (41) is provided on the bottom surface of the cover plate (4), and the connecting ring plate (31) extends upward to be connected to the groove top wall of the mounting groove (41).
8. Full-tab battery, characterized in that: The invention comprises a shell (5), a pole (6), an isolating sleeve (7), a lower busbar (8) and a battery connection structure according to any one of claims 1 to 7, wherein the core pack (1) is arranged in the shell (5), the pole (6) passes through the cover plate (4), the isolating sleeve (7) is sleeved on the outer periphery of the pole (6) and is used to separate the pole (6) from the cover plate (4), the lower end of the lower busbar (8) is connected to another group of pole ears at the bottom of the core pack (1), and the upper end of the lower busbar (8) is connected to the bottom of the pole (6).
9. The full-tab battery according to claim 8, characterized in that: A circumferentially extending positioning groove (42) is provided on the bottom wall of the cover plate (4), the positioning groove (42) is arranged to penetrate outwardly through the circumferential wall of the cover plate (4), and the upper edge of the shell (5) is connected to the groove top wall of the positioning groove (42).
10. The full-tab battery according to claim 9, characterized in that: The lower end of the pole (6) is provided with a connecting plate (61) extending horizontally and connected to the lower busbar (8), and the lower end of the isolation sleeve (7) is provided with a partition (71) extending toward the periphery, and the partition (71) is arranged to protrude from the connecting plate (61) toward the periphery.