Cylindrical battery roll core structure

Abstract

The utility model discloses a cylindrical battery roll core structure, relates to the technical field of battery manufacturing, and adopts a concentric circle mode to realize the same-side pole outlet of positive and negative tabs, short current transmission path, reduced internal resistance, uniform distribution of current space of the positive and negative tabs, reduced current transmission path, reduced battery internal resistance and improved discharging and charging efficiency. Meanwhile, according to the design, the welding positions of the positive and negative tabs are unified, the effects of simplifying the manufacturing process and reducing the dislocation possibility of the tabs can be achieved, so that the purposes of reducing the yield and improving the manufacturing efficiency and the product quality are achieved, and moreover, by optimizing a current transmission path, the battery is more stable in high-power and rapid charging and discharging scenes, and the service life of the battery is prolonged. And higher market requirements can be met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery manufacturing technical field, especially related to a cylindrical battery roll core structure. BACKGROUND

[0002] Cylindrical batteries are widely used in electric vehicles, electronic devices, and energy storage systems. However, the existing cylindrical battery roll core and structure still face some key challenges in the design and manufacturing of positive and negative tabs. The traditional cylindrical battery positive and negative tabs use a two-end tab design, with the positive and negative tabs located at the two ends of the battery. This design is simple, but the current transmission path is longer, and the current needs to pass through the external path of the battery shell, resulting in increased internal resistance, which is not conducive to efficient discharge and fast charging. To optimize the current transmission path, some products try to use a same-side tab design. However, this structure has obvious technical difficulties in actual manufacturing. The installation position and connection method of the tab are complex, which easily leads to tab misplacement or poor contact, thereby increasing the defective rate and affecting production efficiency and product quality. More importantly, this design limits the overall performance of the battery, and the same-side tab design also brings higher requirements for process equipment and manufacturing processes, especially in high-capacity and high-power application scenarios, the thermal stability and energy output efficiency of the battery are difficult to meet higher requirements. SUMMARY

[0003] In view of the defects in the prior art, the utility model provides a cylindrical battery roll core structure to solve the above technical problems.

[0004] A cylindrical battery roll core structure includes the following contents:

[0005] The roll core has a diameter of ;

[0006] The roll core top is provided with a first welding site, a second welding site,

[0007] The first welding site is in a circular ring shape, the outer diameter of the first welding site is , and the inner diameter of the first welding site is , wherein ;

[0008] The second welding site is in a circular shape, the center of the second welding site coincides with the center of the roll core, and the diameter of the second welding site is , wherein ;

[0009] The first welding site is used for welding one of the positive or negative tabs, and the second welding site is used for welding the other of the positive or negative tabs;

[0010] The core top is welded with only one negative electrode tab and one positive electrode tab.

[0011] As preferably, it further comprises a pole post, which is welded at the first welding position through the positive electrode tab or the negative electrode tab.

[0012] As preferably, the diameter of the pole post is

[0013] As preferably, a groove is opened at the top of the pole post.

[0014] As preferably, it further comprises a cap, which is welded at the second welding position through the positive electrode tab or the negative electrode tab.

[0015] As preferably, the cap is in the shape of a ring, the outer diameter of the cap is , and the inner diameter of the cap is

[0016] As preferably, the cap comprises a first ring surface, a second ring surface and a hollow cylinder,

[0017] As preferably, the cap comprises a first ring surface, a second ring surface and a hollow cylinder,

[0018] The outer diameter of the first ring surface is , and the inner diameter of the first ring surface is

[0019] The outer diameter of the second ring surface is , and the inner diameter of the second ring surface is

[0020] The bottom of the hollow cylinder is connected with the top of the first ring surface, and the top of the hollow cylinder is connected with the bottom of the second ring surface.

[0021] As preferably, a first flow guide connecting piece is arranged between the pole post and the positive electrode tab.

[0022] As preferably, a second flow guide connecting piece is arranged between the cap and the negative electrode tab.

[0023] As preferably, it further comprises an outer shell, and the core is arranged inside the outer shell.

[0024] ​​​​​​​​​​​The utility model discloses a beneficial effect is: this scheme adopts concentric mode, realizes the same side of positive and negative pole lug, and current transmission path is short, and the internal resistance reduces, and evenly distributes positive and negative pole lug current space, reduces current transmission path, reduces battery internal resistance, improves discharging and charging efficiency, simultaneously, the design unifies the welding position of positive and negative pole lug, can reach the effect of simplifying manufacturing technology, reducing the possibility of pole lug misplacement, thereby reach the purpose of reducing the yield, improve manufacturing efficiency and product quality, and, through optimizing current transmission path, battery is more stable under the scene of high power and fast charge and discharge, can satisfy higher market demand. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiment of the present application or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0026] Figure 1 The utility model provides a kind of structure schematic diagram of first welding position and second welding position of cylindrical battery roll core structure provided by the utility model;

[0027] Figure 2 The utility model provides a kind of structure schematic diagram of embodiment one of cylindrical battery roll core structure provided by the utility model;

[0028] Figure 3 The utility model provides a kind of structure schematic diagram of embodiment two of cylindrical battery roll core structure provided by the utility model;

[0029] Figure 4 The utility model provides a kind of structure schematic diagram of embodiment three of cylindrical battery roll core structure provided by the utility model;

[0030] Figure 5 The utility model provides a kind of structure schematic diagram of embodiment four of cylindrical battery roll core structure provided by the utility model;

[0031] Figure 6 The utility model provides a kind of structure schematic diagram of embodiment five of cylindrical battery roll core structure provided by the utility model;

[0032] Figure 7 The utility model provides a kind of structure schematic diagram of embodiment six of cylindrical battery roll core structure provided by the utility model;

[0033] Legend: 1 - negative tab, 2 - first flow guide tab, 3 - positive tab, 4 - second flow guide tab, 5 - pole, 6 - cap, 601 - first circular surface, 602 - second circular surface, 603 - hollow cylinder, 7 - winding core, 8 - outer shell, 9 - first welding position, 10 - second welding position, 11 - through hole. DETAILED DESCRIPTION

[0034] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0035] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model.

[0036] The embodiments of the utility model will be described in detail below in combination with the drawings.

[0037] As Figure 1 shown, the utility model discloses a cylindrical battery winding core structure, including the following contents:

[0038] Winding core 7, the diameter of the winding core 7 is ;

[0039] The top of the winding core 7 is provided with a first welding position 9, a second welding position 10,

[0040] The first welding position 9 is circular ring type, and the outer diameter of the first welding position 9 is , and the inner diameter of the first welding position 9 is , wherein ;

[0041] The second welding position 10 is circular, the center of the second welding position 10 coincides with the center of the winding core 7, and the diameter of the second welding position 10 is , wherein ;

[0042] The first welding position 9 is used for welding one of the positive tab 3 or the negative tab 1,

[0043] The second welding site 10 is used for welding the other one of the positive electrode tab 3 or the negative electrode tab 1;

[0044] Only one negative electrode tab 1 and one positive electrode tab 3 are welded at the top of the winding core 7.

[0045] The present scheme adopts the concentric circle mode to realize the same-side tabbing of the positive and negative electrode tabs, shortens the current transmission path, reduces the internal resistance, uniformly distributes the positive and negative electrode tab current space, reduces the current transmission path, reduces the battery internal resistance, improves the discharge and charging efficiency, and simultaneously unifies the positive and negative electrode tab welding positions, can simplify the manufacturing process and reduce the possibility of tab misplacement, thereby achieving the purposes of reducing the yield rate, improving the manufacturing efficiency and product quality, and optimizing the current transmission path, so that the battery performs more stably in the high-power and fast charging and discharging scenarios, and can meet higher market demands. The area of the first welding site and the second welding site can be proportionally adjusted according to the performance requirements of the battery cell product. The laser welding connection mode can realize efficient connection while avoiding overly complex winding core structure, has high current conduction efficiency, and has low battery internal resistance.

[0046] It should be noted that the first welding site and the second welding site are both virtual sites provided at the top of the winding core, and a through hole 11 exists in the middle of the second welding site. The through hole 11 is generated in the winding process of the winding core. The tab and the separator of the winding core are wound around the center axis. After the winding step is completed, the center axis is extracted to form the through hole 11.

[0047] More specifically, the pole 5 is welded to the first welding site 9 through the positive electrode tab 3 or the negative electrode tab 1.

[0048] Through the welding of the pole and the positive and negative electrode tabs, the manufacturing process is further simplified, the possibility of tab misplacement is reduced, thereby reducing the yield rate, improving the manufacturing efficiency and product quality. At the same time, the optimized current transmission path makes the battery perform more stably in the high-power and fast charging and discharging scenarios.

[0049] More specifically, the diameter of the pole 5 is , wherein, .

[0050] More specifically, a groove is provided at the top of the pole 5.

[0051] The existence of the groove can enhance the mechanical strength of the welding area, ensure the stability of the battery in the high-power and fast charging and discharging scenarios, and meet higher market demands.

[0052] More specifically, the cap 6 is welded to the second welding site 10 through the positive electrode tab 3 or the negative electrode tab 1.

[0053] The cap is welded to the second welding position through the positive and negative tabs, thereby realizing centralized design of the welding position, ensuring that the welding positions of the positive and negative tabs are concentrated and uniform, and reducing the defective product rate.

[0054] More specifically, the cap 6 is in the form of a circular ring, the outer diameter of the cap 6 is ; the inner diameter of the cap 6 is ,

[0055] Among them, , .

[0056] The circular ring design of the cap is consistent with the diameter of the core, reduces the internal resistance of the battery, optimizes the connection between the cap and the welding position, and the inner diameter of the cap matches the diameter of the second welding position, ensuring accurate installation, reducing manufacturing errors and defective product rate, and improving manufacturing efficiency and product quality.

[0057] On this basis, the cap can be flexibly adapted according to the differences in the top structure of the pole in specific implementation, for example:

[0058] As shown in Figure 2 , in example one, the top of the pole is flat, the pole is directly connected with the positive or negative tab of the second welding position, and the cap is directly connected with the positive or negative tab of the first welding position as a whole.

[0059] As shown in Figure 3 , in example two, the top of the pole has a groove, the pole is still directly connected with the positive or negative tab of the second welding position, and the cap is directly connected with the positive or negative tab of the first welding position as a whole.

[0060] More specifically, the cap includes a first circular ring surface 601, a second circular ring surface 602, and a hollow cylinder 603,

[0061] The outer diameter of the first circular ring surface 601 is , wherein ; the inner diameter of the first circular ring surface 601 is , wherein ;

[0062] The outer diameter of the second circular ring surface 602 is , wherein ; the inner diameter of the second circular ring surface 602 is , wherein ;

[0063] The bottom of the hollow cylinder 603 is connected with the top of the first circular ring surface 601, and the top of the hollow cylinder 603 is connected with the bottom of the second circular ring surface 602.

[0064] The multi-ring surface structure design of the cap reduces the internal resistance of the battery by precisely matching the inner and outer diameters, optimizes the current transmission path, reduces manufacturing errors and defective rates through precise inner and outer diameter matching, the hollow cylindrical connection mode enhances the mechanical strength of the cap, ensures the stability of the battery in high-power and fast charge and discharge scenarios, and improves the thermal stability and reliability of the battery.

[0065] More specifically, it also includes a first flow guide connecting piece 2, which is installed at the bottom of the pole 5.

[0066] Through the optimized design of the first flow guide connecting piece, the heat distribution of the battery in high-power and fast charge and discharge scenarios is more uniform, the thermal stability is significantly improved, and the reliability and stability of the battery in complex working conditions are ensured.

[0067] When the bottom of the pole is a positive tab, the first flow guide connecting piece is a positive flow guide connecting piece, and when the bottom of the pole is a negative tab, the first flow guide connecting piece is a negative flow guide connecting piece.

[0068] As shown in Figure 4 , in example three, the pole is in the form of a cylinder as a whole, the pole is connected to the positive or negative tab of the second welding site through the first flow guide connecting piece, and the cap is directly connected to the positive or negative tab of the first welding site through the bottom of the first annular surface.

[0069] As shown in Figure 5 , in example four, the pole has a groove at the top, the pole is connected to the positive or negative tab of the second welding site through the first flow guide connecting piece, and the cap is directly connected to the positive or negative tab of the first welding site through the bottom of the first annular surface.

[0070] More specifically, it also includes a second flow guide connecting piece 4, which is installed at the bottom of the cap 6.

[0071] The design of the second flow guide connecting piece simplifies the manufacturing process, reduces the possibility of tab misplacement in this embodiment, the heat distribution of the battery in high-power and fast charge and discharge scenarios is more uniform, the thermal stability is significantly improved, and the reliability and stability of the battery in complex working conditions are ensured.

[0072] When the bottom of the cap is a positive tab, the second flow guide connecting piece is a positive flow guide connecting piece, and when the bottom of the cap is a negative tab, the second flow guide connecting piece is a negative flow guide connecting piece.

[0073] As shown in Figure 6 , in example five, the pole is in the form of a cylinder as a whole, the pole is connected to the positive or negative tab of the second welding site through the first flow guide connecting piece, and the cap is connected to the positive or negative tab of the first welding site through the second flow guide connecting piece.

[0074] As Figure 7 shown in the embodiment six, there is a groove at the top of the pole, the pole is connected with the positive or negative pole lug of the first welding position through the first flow guide web, and the cap is connected with the positive or negative pole lug of the second welding position through the second flow guide web.

[0075] More specifically, it further comprises an outer shell 8, and the winding core 7 is arranged inside the outer shell 8.

[0076] The winding core is arranged inside the outer shell, which ensures the overall sealing of the battery, prevents the influence of external impurities and moisture on the inside of the battery, improves the reliability and service life of the battery, optimizes the structural layout of the battery, further optimizes the structure of the battery, and improves the overall performance and production efficiency of the product.

[0077] When the outer shell is a steel shell structure, the negative pole lug is welded at the first welding position, and the positive pole lug is welded at the second welding position.

[0078] When the outer shell is an aluminum shell structure, the positive pole lug is welded at the first welding position, and the negative pole lug is welded at the second welding position.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A cylindrical battery jelly-roll structure, characterized by, The application relates to a winding core (7) with a diameter of ; the top of the winding core (7) is provided with a first welding position (9) and a second welding position (10); the first welding position (9) is in the form of a ring, the outer diameter of the first welding position (9) is , and the inner diameter of the first welding position (9) is , wherein ; the second welding position (10) is in the form of a circle, the center of the second welding position (10) is coincident with the center of the winding core (7), and the diameter of the second welding position (10) is , wherein ; the first welding position (9) is used for welding one of a positive electrode tab (3) or a negative electrode tab (1), and the second welding position (10) is used for welding the other of the positive electrode tab (3) and the negative electrode tab (1); only one negative electrode tab (1) and one positive electrode tab (3) are welded on the top of the winding core (7).

2. The cylindrical battery roll core structure according to claim 1, characterized by, Further comprising a pole post (5) welded at the first welding position (9) by the positive electrode tab (3) or the negative electrode tab (1). 3.The cylindrical battery roll core structure according to claim 2, characterized by, The diameter of the pole (5) is wherein .

4. The cylindrical battery roll core structure according to claim 3, characterized by, A groove is formed at the top of the pole post (5).

5. The cylindrical battery roll core structure according to claim 3 or 4, characterized by, Further comprising a cap (6) welded at the second welding position (10) by the positive electrode tab (3) or the negative electrode tab (1).

6. The cylindrical battery roll core structure according to claim 5, characterized in that: The cap (6) is in the form of a circular ring, the outer diameter of the cap (6) is , and the inner diameter of the cap (6) is ; wherein , . 7.The cylindrical battery roll core structure according to claim 5, characterized by, The cap comprises a first circular ring surface (601), a second circular ring surface (602) and a hollow cylinder (603), the outer diameter of the first circular ring surface (601) is wherein, ; the inner diameter of the first circular ring surface (601) is wherein, ; the outer diameter of the second circular ring surface (602) is wherein, ; the inner diameter of the second circular ring surface (602) is wherein, ; the bottom of the hollow cylinder (603) is connected with the top of the first circular ring surface (601), and the top of the hollow cylinder (603) is connected with the bottom of the second circular ring surface (602). 8.The cylindrical battery roll core structure according to claim 6 or 7, characterized in that, Further comprising a first flow guide connecting plate (2) arranged at the bottom of the pole post (5). 9.The cylindrical battery roll core structure according to claim 6 or 7, characterized in that, Further comprising a second flow guide connecting plate (4) arranged at the bottom of the cap (6). 10.The cylindrical battery roll core structure of claim 5, wherein, Further comprising an outer shell (8), and the roll core (7) is arranged inside the outer shell (8).

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