Eccentric same-side tab battery structure

Abstract

The utility model provides an eccentric same-side tab battery structure, which comprises a shell, and a lower insulating sheet, a roll core, a second confluence sheet, an upper insulating sheet, a cover plate, a pole and a sealing nail which are sequentially arranged from bottom to top, a first tab of the roll core is welded with a first confluence sheet, an edge turnup of the first confluence sheet is flush with the edge of the shell, and after the cover plate is covered, the second tab of the roll core is welded with the edge turnup of the first confluence sheet. The shell, the first convergence sheet and the cover plate are completely attached and are welded in a three-in-one manner; the polar column is riveted with the eccentric position of the cover plate, a second tab of the roll core is welded with a second bus sheet, the center of the second bus sheet is connected with the polar column, and the polar column is sealed through a sealing nail; and an upper insulating sheet is arranged between the cover plate and the second bus sheet. According to the eccentric same-side tab battery structure disclosed by the utility model, the pole is positioned at the eccentric position on the cover plate, so that the length of a connecting piece can be reduced, the weight of a module can be reduced and the cost can be saved when a battery pack is manufactured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy battery field especially, it relates to an eccentric formula same side tab cell structure. BACKGROUND

[0002] The big cylindrical battery on market usually carries out winding through the mode of two sides out continuous positive and negative tabs, simultaneously carries out tab and busbar welding at the both ends of positive and negative poles, then welds the busbar to the shell or pole, finally carries out circumferential welding and connects the tab, busbar and shell. The above-mentioned cylindrical battery has the following problems: 1) the positive and negative tabs increase the winding core height after rubbing flat, the different side tab reduces the space utilization rate of the battery in the height direction, and the energy density is low; 2) the different side tab increases the battery internal resistance when packing, and reduces the battery energy conversion efficiency. SUMMARY

[0003] Therefore, the utility model aims at providing an eccentric formula same side tab cell structure to solve the problems of low battery energy density and slow conversion efficiency.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0005] An eccentric formula same side tab cell structure, comprising a shell and a lower insulating sheet, a winding core, a second busbar, an upper insulating sheet, a cover plate, a pole and a sealing nail which are sequentially installed from bottom to top, the first tab of the winding core is welded with the first busbar, the edge of the first busbar is folded and flush with the edge of the shell, after covering the cover plate, the shell, the first busbar and the cover plate are completely attached and three-in-one welded; after riveting the eccentric position of the pole and the cover plate, the second tab of the winding core is welded with the second busbar, the center of the second busbar is connected with the pole, and the pole is sealed through the sealing nail; the upper insulating sheet is arranged between the cover plate and the second busbar.

[0006] Further, the pole is riveted with the cover plate through a first sealing ring and a second sealing ring.

[0007] Further, the edge of the first busbar is provided with a folded edge, and a plurality of positive protrusions and positive recesses are arranged in the first busbar, and the positive protrusions and the positive recesses are staggered; the positive recess is the welding area of the first tab of the winding core and the first busbar.

[0008] Further, the center of the first busbar is provided with an arc-shaped positive groove.

[0009] Further, the first busbar is a fan-shaped structure.

[0010] Further, the cover plate is provided with a cover plate groove matched with the number and structure of the positive protrusions, for limiting the cover plate and the first busbar.

[0011] Further, the shell is a one-side open cylindrical structure.

[0012] Further, the second bus bar is provided with negative protrusions and negative grooves staggered with each other, and is further provided with a liquid injection hole, an end of the liquid injection hole forms a limiting ring, and the negative grooves are welding areas of the second tab of the roll core and the second bus bar.

[0013] Further, the second bus bar is a fan-shaped structure.

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

[0015] (1) The eccentric same-side tab battery structure, the negative pole is located at the center of the second bus bar, and the current can be gathered to the pole in time after being gathered to the bus bar, so that the internal resistance is reduced, and the local overheating of the battery caused by long-time current gathering is avoided; the first bus bar is attached to the shell, the cover plate is buckled, and the first bus bar, the shell and the cover plate are welded in one piece through circumferential welding, so that the welding area is increased, the current conduction is facilitated, the temperature rise is avoided, and the problems of low battery energy density and slow conversion efficiency are effectively solved.

[0016] (2) The eccentric same-side tab battery structure, since the pole is located at the eccentric position of the cover plate, the length of the connecting piece can be reduced when the battery pack is manufactured, the weight of the module is reduced, and the cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application, and are incorporated herein for purposes of explanation, and are not intended to limit the application. In the drawings:

[0018] Fig. 1 The explosion view of the eccentric same-side tab battery structure according to the embodiment of the application;

[0019] Fig. 2 The schematic view of the first bus bar according to the embodiment of the application;

[0020] Fig. 3 The schematic view of the second bus bar according to the embodiment of the application.

[0021] Explanation of reference signs:

[0022] 1-insulating lower sheet; 2-housing; 3-winding core; 4-first busbar; 41-positive electrode protrusion; 42-positive electrode groove; 43-flange; 5-second busbar; 51-negative electrode protrusion; 52-negative electrode groove; 53-liquid injection hole; 54-limiting ring; 6-insulating upper sheet; 7-cover plate; 8-first sealing ring; 9-second sealing ring; 10-pole; 11-sealing nail. DETAILED DESCRIPTION

[0023] 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.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "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.

[0025] 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 fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0026] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] A eccentric type same side tab battery structure, such as Figs. 1 to 3As shown, the shell 2 and the sequentially mounted lower insulating sheet 1, winding core 3, second bus bar 5, upper insulating sheet 6, cover plate 7, pole 10 and sealing nail 11 from bottom to top, the first lug of the winding core 3 is welded with the first bus bar 4, the edge of the first bus bar 4 is flush with the edge of the shell 2, after the cover plate 7 is covered, the shell 2, the first bus bar 4 and the cover plate 7 are completely attached and three-in-one welded; the second lug of the winding core 3 is welded with the second bus bar 5, after the second bus bar 5 is connected with the pole 10 at the center, the pole 10 is sealing riveted with the eccentric position of the cover plate 7, the pole 10 is sealed through the sealing nail 11; the upper insulating sheet 6 is arranged between the cover plate 7 and the second bus bar 5.

[0028] The position where the second bus bar 5 is connected with the pole 10 is located in the middle of the second bus bar 5, which is convenient for the current at each position to converge to the center. Since the pole 10 is at the eccentric position of the cover plate 7, the length of the connecting sheet can be reduced when the battery pack is formed, the weight of the module is reduced, and the cost is saved.

[0029] The pole 10 is sealing riveted with the cover plate 7 through the first sealing ring 8 and the second sealing ring 9.

[0030] The first bus bar 4 is in a fan shape structure, the center of the first bus bar 4 is provided with an arc-shaped positive electrode groove 44, the edge of the first bus bar 4 is provided with a flange 43, the inside is provided with a plurality of positive electrode protrusions 41 and positive electrode grooves 42, and the two are staggered. The positive electrode groove 42 is the welding area of the first lug of the winding core and the first bus bar 4, the flange 43 is flush with the edge of the shell 2, after the cover plate 7 is covered, the shell 2, the first bus bar 4 and the cover plate 7 are completely attached, and three-in-one welding.

[0031] In one or more embodiments, the number of positive electrode protrusions 41 is 3. The cover plate 7 is provided with a cover plate groove matching the number and structure of the positive electrode protrusions 41 for limiting the cover plate 7 and the first bus bar 4. After welding, the current can be directly led out through the center of the cover plate, improving the battery rate performance.

[0032] The shell 2 is a cylindrical structure with one side open. The inside of the closed side is first assembled with the lower insulating sheet 1 to avoid the diaphragm tilting after the non-pole lug side winding core 3 enters the shell, and the pole piece contacts the shell 2.

[0033] The second bus bar 5 is in a fan shape structure, the second bus bar 5 is provided with negative electrode protrusions 51 and negative electrode grooves 52 staggered with each other, the second bus bar 5 is further provided with a liquid injection hole 53, the end of the liquid injection hole 53 forms a limiting ring 54, and the negative electrode groove 52 is the welding area of the second lug of the winding core 3 and the second bus bar 5.

[0034] A manufacturing process of an eccentric same-side lug battery structure is as follows:

[0035] The shell 2 is a cylindrical structure with one side open, the closed side of the shell 2 is internally assembled with the lower insulating sheet 1, so as to avoid the inclination of the diaphragm after the core 3 with no lug side enters the shell and the contact of the pole piece with the shell 2; on the other side of the shell 2, the first lug of the core is welded with the first bus bar 4, the first bus bar 4 is provided with three positive protrusions upward after the bus bar is welded with the lug, meanwhile, the cover plate 7 is provided with three recesses, the two parts are overlapped after assembly, so as to match the position of the cover plate 7 (limiting effect), if the high rate performance of the battery is required, the overlapped part can be welded again, so as to improve the flow capacity of the structure. After the pole 10 is sealed and riveted with the cover plate 7 through the first sealing ring 8 and the second sealing ring 9, the second lug of the core 3 is welded with the second bus bar 5, and finally sealed by the sealing nail 11.

[0036] The cylindrical battery with the same side lug simplifies the internal structure of the battery, reduces the number of lugs and connecting pieces, and helps to reduce the manufacturing cost and complexity of the battery. A single-pass shell is adopted, and the bottom insulating gasket insulates the core, so as to avoid the positive and negative pole pieces from contacting the shell, and the first bus bar is arranged at the top half of the core, and the second bus bar is arranged at the other half. Since the temperature of the positive pole is higher than that of the negative pole during pulse discharge, the positive pole is welded with the shell to increase the contact area and improve the flow capacity, the second bus bar is connected with the negative pole, and is riveted on the cover plate. The negative pole is located at the center position of the second bus bar, and the current can be timely gathered to the pole after being gathered to the bus bar, so as to reduce the internal resistance and avoid the long-time gathering of the current to cause the local overheating of the battery. The first bus bar is attached to the shell, the cover plate is buckled, the first bus bar, the shell and the cover plate are welded in one, the welding area is increased, which is helpful for current conduction and avoids the rapid temperature rise. If the battery has high rate performance requirements, the bus bar and the cover plate can be welded twice, the three protrusions of the bus bar are attached to the three recesses of the cover plate, and the current can be directly led out through the center of the cover plate after welding, so as to improve the rate performance of the battery.

[0037] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A structure of eccentrically symmetrically-ear cell, characterized in that: The shell, the lower insulating sheet, the winding core, the second busbar, the upper insulating sheet, the cover plate, the pole and the sealing nail are sequentially arranged from bottom to top, the first lug of the winding core is welded with the first busbar, the edge of the first busbar is folded and flush with the edge of the shell, after the cover plate is covered, the shell, the first busbar and the cover plate are completely attached and three-in-one welded, the pole is riveted with the eccentric position of the cover plate, the second lug of the winding core is welded with the second busbar, the center of the second busbar is connected with the pole, the pole is sealed through the sealing nail, and the upper insulating sheet is arranged between the cover plate and the second busbar.

2. The eccentrically same-side tab cell structure according to claim 1, wherein: The pole is riveted with the cover plate through the first sealing ring and the second sealing ring.

3. The eccentrically same-side tab cell structure according to claim 1, wherein: The edge of the first busbar is provided with a folded edge, and a plurality of positive electrode protrusions and positive electrode grooves are arranged in the first busbar, and the positive electrode protrusions and the positive electrode grooves are staggered.

4. The eccentrically same-side tab cell structure according to claim 3, wherein: The center of the first busbar is provided with an arc-shaped positive electrode groove.

5. The eccentrically same-side tab cell structure according to claim 1, wherein: The first busbar is a fan-shaped structure.

6. The eccentrically same-side tab cell structure according to claim 3, wherein: The cover plate is provided with cover plate grooves matched with the number and structure of the positive electrode protrusions, and the cover plate grooves are used for limiting the cover plate and the first busbar.

7. The eccentrically same-side tab cell structure according to claim 1, wherein: The shell is a cylindrical structure with one side opening.

8. The eccentrically same-side tab cell structure according to claim 1, wherein: The second busbar is provided with positive electrode protrusions and negative electrode grooves staggered with each other, and the second busbar is also provided with a liquid injection hole, the end of the liquid injection hole forms a limiting ring, and the negative electrode groove is a welding area of the second lug of the winding core and the second busbar.

9. The eccentrically same-side tab cell structure according to claim 1, wherein: The second busbar is a fan-shaped structure.

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