Battery structure with tabs on same side

Abstract

The utility model provides a battery structure with tabs on the same side, which comprises a shell, and a lower insulating sheet, a roll core, a second confluence sheet, a pole, an insulating spacer, an upper insulating sheet, a cover plate, a cover plate terminal, a sealing ring and a negative terminal which are sequentially mounted from bottom to top, a second tab of the roll core is welded with the second confluence sheet, and the pole is welded above the second confluence sheet. The pole is located in the center of the roll core, the pole sequentially penetrates through the insulating spacer, the upper insulating sheet and the sealing ring and then is riveted with the negative terminal, a first tab of the roll core is welded to the first bus sheet, the first bus sheet is flush with the second bus sheet, the first bus sheet is welded to the periphery of the shell and the periphery of the cover plate in a three-in-one mode, and the center of the cover plate is welded to the cover plate terminal in the circumferential direction after being attached to the cover plate terminal. And the cover plate terminal is sleeved outside the negative terminal. According to the same-side tab battery structure disclosed by the utility model, the same-side electric connection is realized, the alternating-current internal resistance of the battery is reduced, and the energy conversion efficiency of the battery is improved.

Description

Technical Field

[0001] This utility model belongs to the field of cylindrical batteries, and in particular relates to a battery structure with the same side tab. Background Technology

[0002] Currently, commercially available cylindrical batteries are typically wound with continuous positive second tabs on both sides. Simultaneously, tabs are welded to busbars at both ends, and the busbars are then welded to the casing or terminal post. Finally, the tabs, busbars, and casing are connected for conductivity via circumferential welding. These cylindrical batteries often suffer from the following problems: 1) Flattening the positive and second tabs increases the core height, and tabs on opposite sides reduce the battery's space utilization in the height direction, resulting in lower energy density; 2) During PACK assembly, the casing acts as a conductor, increasing the battery's internal resistance and reducing energy conversion efficiency; 3) During electrode coating, the coating area on one side of the foil is usually thinned. Thinning the negative electrode affects lithium-ion intercalation, causing lithium plating on the electrode and impacting battery lifespan. Utility Model Content

[0003] In view of this, the present invention aims to propose a battery structure with the same-side tab to solve the problem of low battery power conversion efficiency.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A battery structure with a same-side tab includes a housing and, from bottom to top, a lower insulating sheet, a winding core, a second busbar, a terminal post, an insulating gasket, an upper insulating sheet, a cover plate, a cover plate terminal, a sealing ring, and a negative terminal. The second tab of the winding core is welded to the second busbar. The terminal post is welded above the second busbar and is located at the center of the winding core. The terminal post passes through the insulating gasket, the upper insulating sheet, and the sealing ring in sequence and is riveted to the negative terminal. The first tab of the winding core is welded to the first busbar. The first busbar is flush with the second busbar. The first busbar is welded to the housing and the cover plate around its perimeter. The center of the cover plate is fitted with the cover plate terminal and then welded circumferentially. The cover plate terminal is sleeved on the outside of the negative terminal.

[0006] Furthermore, the upper insulating sheet includes a body, which is a disc structure, and a mounting hole is provided at the center of the body.

[0007] Furthermore, the main body is also provided with a limiting groove, which cooperates with the positive protrusion of the first busbar to limit the upper insulating sheet and the first busbar.

[0008] Furthermore, the main body is provided with symmetrically positioned limiting strips, which cooperate with the grooves on the winding core to limit the upper insulating sheet and the winding core.

[0009] Furthermore, the body is provided with several through holes.

[0010] Further, the bottom of the winding core is flush with the bottom cover of the shell.

[0011] Further, the second bus bar is in a fan-shaped structure, a plurality of negative protrusions and negative recesses are arranged on the second bus bar and staggered, a connecting portion is arranged at the center of the second bus bar, and the connecting portion is used for welding the pole; and the negative recess is a welding area of the second pole tab of the winding core and the second bus bar.

[0012] Further, the first bus bar is in a fan-shaped structure, an arc-shaped groove is arranged at the center of the first bus bar and matched with the connecting portion, a flange is arranged at the edge of the first bus bar, a plurality of positive protrusions and positive recesses are arranged in the first bus bar and staggered, and the positive recess is a welding area of the first pole tab of the winding core and the first bus bar.

[0013] Further, the flange is flush with the edge of the shell.

[0014] Compared with the prior art, the same-side tab battery structure has the following advantages:

[0015] (1) The same-side tab battery structure is easier to realize parallel connection, improves the overall energy output and reliability of the battery pack, and can adapt to different BMS and battery pack designs, and improve the versatility and flexibility of the battery.

[0016] (2) The same-side tab battery structure is electrically connected on the same side, reduces the alternating current internal resistance of the battery, and improves the energy conversion efficiency of the battery.

[0017] (3) The same-side tab battery structure has the bottom winding core flush with the bottom cover, improves the effective capacity inside the shell, and increases the energy density of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are presented by way of example or for purpose of illustration and not limitation.

[0019] Fig. 1 The same-side tab battery structure is shown in the exploded view of the embodiment of the application;

[0020] Fig. 2 The same-side tab battery structure is shown in the exploded view of the embodiment of the application;

[0021] Fig. 3 The same-side tab battery structure is shown in the exploded view of the embodiment of the application;

[0022] Fig. 4The utility model discloses a schematic view of the first busbar.

[0023] Mark explanation:

[0024] 1-negative terminal;2-sealing ring;3-cover plate terminal;4-cover plate;5-upper insulating sheet;51-limit slot;52-limit strip;53-mounting hole;54-through hole;6-insulating gasket;7-pole;8-second busbar;81-negative convex;82-negative recess;83-connection part;9-first busbar;91-positive convex;92-positive recess;93-flange;94-arc slot;10-winding core;11-housing;12-lower insulating sheet. Specific embodiments

[0025] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0026] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0027] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0028] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] A same-side tab battery structure, like Figs. 1 to 4As shown, the battery pack includes the shell 11 and the sequentially mounted lower insulating sheet 12, the winding core 10, the second bus bar 8, the pole 7, the insulating gasket 6, the upper insulating sheet 5, the cover plate 4, the cover plate terminal 3, the sealing ring 2 and the negative terminal 1 from bottom to top. The second lug of the winding core 10 is welded to the second bus bar 8. The pole 7 is welded above the second bus bar 8 and located at the center of the winding core 10. The pole 7 is riveted after sequentially passing through the insulating gasket 6, the upper insulating sheet 5, the sealing ring 2 and the negative terminal 1. The first lug of the winding core 10 is welded to the first bus bar 9. The first bus bar 9 is flush with the second bus bar 8. The first bus bar 9 is welded to the shell 11, the cover plate 4 and the cover plate terminal 3. The cover plate 4 is circumferentially welded after being attached to the cover plate terminal 3. The cover plate terminal 3 is sleeved on the outside of the negative terminal 1. When the battery pack is manufactured, the position of the cell pole is changed to the center of the circle to avoid changing the direction of the cell pole group, so that the cell assembly is more convenient. The battery with the same side of the lug is easier to realize parallel connection, reduce the battery alternating current resistance, the battery energy conversion efficiency; improve the overall energy output and reliability of the battery pack, and can adapt to different BMS and battery pack design, improve the versatility and flexibility of the battery.

[0030] The bottom of the winding core 10 is flush with the bottom cover of the shell 11, which improves the effective capacity inside the shell and increases the energy density of the battery.

[0031] The first bus bar 9 is in a fan-shaped structure. The center of the first bus bar 9 is provided with an arc-shaped groove 94. The edge of the first bus bar 9 is provided with a flange 93. The inside is provided with a plurality of positive protrusions 91 and positive recesses 92, which are staggered. The positive recess 92 is the welding area of the first lug of the winding core 10 and the first bus bar 9. The flange 93 is flush with the edge of the shell 11. After the cover plate 4 is covered, the shell 11, the first bus bar 9 and the cover plate 4 are completely attached, and the three are circumferentially welded.

[0032] In one or more embodiments, the number of positive protrusions 91 is 3.

[0033] The second bus bar 8 is in a fan-shaped structure. The second bus bar 8 is provided with a plurality of negative protrusions 81 and negative recesses 82, which are staggered. The center of the second bus bar 8 is provided with a connecting part 83 for welding the pole 7. The negative recess 82 is the welding area of the second lug of the winding core 10 and the second bus bar 8. The connecting part 83 is located at the arc-shaped groove 94 and is attached to the first bus bar 9 and the second bus bar 8 to form a circle. The pole 7 is located at the center of the winding core 10. The position of the cell pole 7 is set at the center of the circle to avoid changing the direction of the cell pole group, so that the cell assembly is more convenient. The pole 7 is welded to the second bus bar 8. The position of the pole 7 is changed to the center of the winding core. The pole 7 is also at the center position on the cover plate 4.

[0034] The upper insulating sheet 5 comprises a body, which is a disc structure, and is provided with a mounting hole 53 for penetrating the pole 7 and the insulating washer 6, and is further provided with a limiting groove 51 for cooperating with the positive protrusion 91 to limit the position of the upper insulating sheet 5 and the first bus bar 2, and is further provided with a limiting strip 52 symmetrically arranged on the body, which cooperates with the groove on the winding core 10 to limit the position of the upper insulating sheet 5 and the winding core 10; and a plurality of through holes 54 are arranged on the body, which have two functions, the first is to facilitate the smooth flow of electrolyte into the winding core and prevent electrolyte from remaining between the cover plate and the insulating sheet, and the second is to reduce the weight of the battery cell and increase the energy density.

[0035] The shell 211 is a cylindrical structure with one side open.

[0036] A manufacturing process of the same-side tab battery structure is as follows:

[0037] The shell 11 is a cylindrical structure with one side open, and the closed side of the shell 11 is first assembled with the lower insulating sheet 12 to prevent the diaphragm from tilting after the winding core 10 without a tab is put into the shell, and the pole piece contacts the shell 11; on the other side of the shell 11, the first tab of the winding core 10 is welded to the first bus bar 9, the second tab of the winding core 10 is welded to the second bus bar 8, the pole 7 is welded above the second bus bar 8, and the pole 7 is located at the center position of the winding core 10, the sealing ring 2 and the negative terminal 1 are riveted together after the pole 7 penetrates the insulating washer 6 and the upper insulating sheet 5 in sequence, the cover plate 4 is covered, the cover plate 4 is welded with the shell 11, the first bus bar 9 and the cover plate terminal 1 in a three-in-one periphery, the cover plate 4 is attached to the cover plate terminal 1, and a circle of seam welding is performed on the periphery to complete the assembly. After assembly, the battery cell has no direction distinction, which is convenient for battery pack assembly. The same-side tab battery structure simplifies the internal structure of the battery, reduces the number of tabs and connecting pieces, and helps to reduce the manufacturing cost and complexity of the battery. The same-side electrical connection reduces the alternating current internal resistance of the battery, and improves the energy conversion efficiency of the battery.

[0038] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coin cell battery structure of the same side tab type, characterized by: The shell and the sequentially mounted lower insulating sheet, roll core, second busbar, pole, insulating gasket, upper insulating sheet, cover plate, cover plate terminal, sealing ring and negative terminal from bottom to top, the pole is welded on the second busbar, and the pole is located at the center position of the roll core, the pole is riveted through the insulating gasket, the upper insulating sheet, the sealing ring and the negative terminal in sequence, and the second lug of the roll core is welded with the second busbar; the first lug of the roll core is welded with the first busbar, the first busbar is flush with the second busbar, the first busbar is welded with the shell, the cover plate and the periphery of the three, the cover plate is welded in the circumferential direction after the cover plate is attached to the cover plate terminal, and the cover plate terminal is sleeved outside the negative terminal.

2. The coin cell structure of claim 1, wherein: The upper insulating sheet comprises a body, the body is a disc structure, and the body is provided with a mounting hole at the center.

3. The coin cell structure of claim 2, wherein: The body is further provided with a limiting groove, the limiting groove is matched with the positive protrusion of the first busbar, and the limiting groove is used for limiting the upper insulating sheet and the first busbar.

4. The coin cell battery structure of claim 2, wherein: The body is provided with position-symmetric limiting strips, the limiting strips are matched with the grooves on the roll core, and the limiting strips are used for limiting the upper insulating sheet and the roll core.

5. The coin cell battery structure of claim 2, wherein: The body is provided with a plurality of through holes.

6. The coin cell battery structure of claim 1, wherein: The bottom of the roll core is flush with the bottom cover of the shell.

7. The coin cell battery structure of claim 1, wherein: The second busbar is a fan-shaped structure, a plurality of negative protrusions and negative grooves are arranged on the second busbar and staggered, a connecting portion is arranged at the center of the second busbar, the connecting portion is used for welding the pole, and the negative groove is a welding area of the second lug of the roll core and the second busbar.

8. The coin cell battery structure of claim 7, wherein: The first busbar is a fan-shaped structure, an arc-shaped groove is arranged at the center of the first busbar and attached to the connecting portion, a flange is arranged at the edge of the first busbar, a plurality of positive protrusions and positive grooves are arranged in the first busbar and staggered, and the positive groove is a welding area of the first lug of the roll core and the first busbar.

9. The coin cell battery structure of claim 8, wherein: The flange is flush with the edge of the shell.

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