Cathode collector plate and battery system

Abstract

The utility model provides a cathode bus plate and a battery system. The negative electrode confluence plate comprises a confluence plate body, one side of the confluence plate body is provided with a tab welding area, the other side of the confluence plate body is provided with a welding boss, the end face of the welding boss is provided with a shell welding area, and the area of the tab welding area is larger than that of the shell welding area. According to the utility model, the problem of poor welding effect between the cathode confluence plate and the steel shell in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, specifically, a negative electrode busbar and battery system. BACKGROUND

[0002] At present, the common cylindrical cell's tab is welded with the busbar first, and then the steel shell is welded with the busbar, but the welding mode of the common negative electrode busbar and the steel shell is generally resistance welding and laser welding, the welding residue of resistance welding is little, but the overcurrent capacity is limited and the welding tension is small, the welding line of laser welding generally adopts straight line, and the clearance exists between the busbar and the steel shell due to the flatness of the busbar and the winding core, which easily leads to false welding.

[0003] Therefore, the welding effect between the negative electrode busbar and the steel shell is poor in the prior art. UTILITY MODEL CONTENTS

[0004] The utility model discloses a negative electrode busbar and battery system, which solves the problem of poor welding effect between the negative electrode busbar and the steel shell in the related art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a negative electrode busbar is provided, which comprises a busbar body, one side of the busbar body has a tab welding area, the other side of the busbar body has a welding boss, the end face of the welding boss has a shell welding area, and the area of the tab welding area is greater than the area of the shell welding area.

[0006] Further, one side of the busbar body having the tab welding area has a sink groove to form the welding boss.

[0007] Further, the welding boss is cylindrical, and the welding boss is coaxial with the busbar body.

[0008] Further, the ratio of the radius R2 of the welding boss to the radius R1 of the busbar body is greater than or equal to 0.2 and less than or equal to 0.3.

[0009] Further, the area of the shell welding area is less than or equal to the area of the end face of the welding boss.

[0010] Further, the distance between the two sides of the busbar body is H1, the distance between the surface of the busbar body where the tab welding area is located and the end face of the welding boss is H2, and the ratio between H1 and H2 is greater than or equal to 0.55 and less than or equal to 0.65.

[0011] According to another aspect of the utility model, a battery system is provided, which comprises the above-mentioned negative electrode busbar.

[0012] Further, the battery system further comprises the battery cell and the shell, at least a part of the battery cell and the negative busbar are arranged in the interior of the shell respectively, and the tab of the battery cell and the tab welding area of the negative busbar are welded, and the shell and the shell welding area of the negative busbar are welded.

[0013] Further, the welding wire between the shell and the shell welding area is a curved welding wire, and the curved welding wire is a sinusoidal spiral line.

[0014] Further, the welding boss of the negative busbar is arranged corresponding to the center hole of the battery cell.

[0015] According to the technical scheme of the utility model, the negative busbar in the application comprises a busbar body, one side of the busbar body has a tab welding area, the other side of the busbar body has a welding boss, the end face of the welding boss has a shell welding area, and the area of the tab welding area is greater than the area of the shell welding area.

[0016] When the negative busbar in the application is used, by arranging the tab welding area on one side of the busbar body and the welding boss on the other side, the stable welding of the battery cell tab and the busbar is effectively realized, and at the same time, by welding the shell and the shell welding area of the welding boss, the overall structural strength and the reliability of electrical connection of the battery system are enhanced. Moreover, since the welding boss is arranged on the other side of the busbar body and the tab of the battery cell, the problem of the gap between the busbar and the shell due to the difference in flatness of the busbar and the battery cell of the battery system can be solved by welding the shell welding area on the welding boss and the shell of the battery system. On the other hand, the side of the busbar with the welding boss, except the welding boss, can be in contact with the shell under the action of the battery cell of the battery system. Therefore, the negative busbar in the application effectively solves the problem of poor welding effect between the negative busbar and the steel shell in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the application form a part of the application and serve to provide further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0018] Figure 1 Fig. 1 shows a structure schematic view of a negative busbar according to one specific embodiment of the utility model;

[0019] Figure 2 Fig. 2 shows a front view of the negative busbar in Fig. 1; Figure 1

[0020] Figure 3 Fig. 3 shows an enlarged view of A in Fig. 2; Figure 2

[0021] ​​Figure 4 A schematic diagram showing the positional relationship between the busbar body of the negative busbar and the sinusoidal spiral line in one specific embodiment of the application is shown.

[0022] Wherein, the above-mentioned drawings include the following reference signs:

[0023] 10, busbar body; 20, welding boss; 30, sinusoidal spiral line. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be apparently and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of at least one exemplary embodiment is only illustrative, rather than any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0026] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various embodiments described herein are not limiting. It should be understood that the dimensions of the various parts shown in the drawings are not necessarily to scale. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description of the application. In all examples shown and discussed herein, any specific value should be interpreted as merely illustrative and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It should be noted that similar reference signs and letters in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0027] A negative busbar and a battery system are provided to solve the problem of poor welding effect between the negative busbar and the steel shell in the related art.

[0028] As Figures 1 to 4As shown, the negative busbar in the present application comprises a busbar body 10, one side of the busbar body 10 is provided with a tab welding area, the other side of the busbar body 10 is provided with a welding boss 20, the end face of the welding boss 20 is provided with a shell welding area, and the area of the tab welding area is greater than the area of the shell welding area.

[0029] When the negative busbar in the present application is used, by setting the tab welding area on one side of the busbar body 10 and the welding boss 20 on the other side, the stable welding of the cell tab and the busbar is effectively realized, and at the same time, the welding of the shell and the shell welding area of the welding boss 20 enhances the overall structural strength and the reliability of the electrical connection of the battery system. Moreover, since the welding boss 20 is arranged on the other side of the busbar body 10 and the tab welding of the cell, the problem of gap between the busbar and the shell due to the difference in flatness of the busbar and the cell of the battery system can be solved by welding the shell welding area on the welding boss 20 and the shell of the battery system. On the other hand, the side of the busbar with the welding boss 20 can be in contact with the shell under the force of the cell of the battery system except the welding boss 20. Therefore, the negative busbar in the present application effectively solves the problem of poor welding effect between the negative busbar and the steel shell in the prior art.

[0030] Moreover, a battery system is also provided in the present application, and the battery system in the present application has the negative busbar in the present application. At the same time, the battery system further comprises a cell and a shell, at least a part of the cell and the negative busbar are arranged in the interior of the shell respectively, and the tab of the cell is welded with the tab welding area of the negative busbar, and the shell is welded with the shell welding area of the negative busbar.

[0031] Optionally, the side of the busbar body 10 with the tab welding area is provided with a sink groove to form the welding boss 20. Or in other words, the interior of the welding boss 20 in the present application can be hollow. Of course, the specific structure and shape of the welding boss 20 can be adaptively adjusted according to the actual use in the present application.

[0032] In a preferred embodiment of the present application, the welding boss 20 is cylindrical, and the welding boss 20 is coaxial with the busbar body 10. Moreover, in the present embodiment, the welding boss 20 of the negative busbar is arranged corresponding to the center hole of the cell of the battery system. By such arrangement, the welding boss 20 can be effectively prevented from being subjected to the force of the cell.

[0033] Optionally, the ratio of the radius R2 of the welding boss 20 to the radius R1 of the busbar body 10 is greater than or equal to 0.2 and less than or equal to 0.3. Of course, the relationship between R1 and R2 can be adaptively adjusted according to the actual use and design requirements in the present application.

[0034] Specifically, the area of the shell welding area is less than or equal to the area of the end surface of the welding boss 20. In one embodiment of the present application, the end surface of the welding boss 20 is the shell welding area, and the welding line between the shell and the shell welding area is a curved welding line, and the curved welding line is a sinusoidal spiral line 30. At this time, the center of the sinusoidal spiral line 30 coincides with the axis of the welding boss 20, and the radius R3 of the sinusoidal spiral line 30 is less than the radius R2 of the welding boss 20, so as to ensure that the welding of the shell and the negative bus bar does not interfere with the welding of the cell tab and the negative bus bar. In the present application, laser welding can be used to weld the shell welding area of the shell and the negative bus bar. The welding line trajectory of the sinusoidal spiral line 30 is longer than that of a straight line, and the area is larger, thereby ensuring that the welding area is increased, the overcurrent capacity of the negative bus bar and the shell is better, and the cell is more suitable for high-rate discharge.

[0035] Optionally, the distance between the two sides of the bus bar body 10 is H1, the distance between the surface of the bus bar body 10 where the tab welding area is located and the end surface of the welding boss 20 is H2, and the ratio between H1 and H2 is greater than or equal to 0.55 and less than or equal to 0.65. In the present application, such setting can ensure that the side of the bus bar body 10 away from the cell can be in contact with the shell under the action of the cell force, thereby ensuring the use performance of the battery system. Of course, in the present application, the relationship between H1 and H2 can be adaptively adjusted according to actual use and design requirements.

[0036] In one embodiment of the present application, H1 is 0.15mm, H2 is 0.25mm, and the height of the welding boss 20 is 0.1mm.

[0037] From the above description, it can be seen that the embodiments of the present application achieve the following technical effects:

[0038] 1. Effectively solve the problem of poor welding effect between the negative bus bar and the steel shell in the prior art;

[0039] 2. Simple structure and stable performance.

[0040] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0041] For ease of description, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "below" or "beneath" other elements or features would then be oriented "above" and "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Well-known structures have been used consistently throughout this disclosure to

[0042] In addition, it should be noted that the use of "first", "second", and the like words of resemblance to limit parts, only for the convenience of the corresponding parts are distinguished, such as no other declaration, the above words have no special meaning, therefore can not be understood as the limitation of the scope of protection of the utility model.

[0043] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A negative busbar, characterized by, The busbar body (10) has a tab welding area on one side and a welding boss (20) on the other side, the end face of the welding boss (20) has a shell welding area, and the area of the tab welding area is larger than that of the shell welding area.

2. The negative busbar according to claim 1, characterized by The welding boss (20) is cylindrical, and the welding boss (20) is coaxial with the busbar body (10).

3. The negative busbar according to claim 2, characterized in that, The ratio of the radius R2 of the welding boss (20) to the radius R1 of the busbar body (10) is greater than or equal to 0.2 and less than or equal to 0.

3.

4. The negative bus plate according to any one of claims 1 to 3, characterized in that, The area of the shell welding area is less than or equal to the area of the end face of the welding boss (20).

5. The negative bus plate according to any one of claims 1 to 3, characterized in that, The distance between the two sides of the busbar body (10) is H1, the distance between the surface of the busbar body (10) where the tab welding area is located and the end face of the welding boss (20) is H2, and the ratio between H1 and H2 is greater than or equal to 0.55 and less than or equal to 0.

65.

6. A battery system characterized by, The battery system further comprises a cell and a shell, at least a part of the cell and the negative busbar are respectively arranged inside the shell, and the tab of the cell is welded with the tab welding area of the negative busbar, and the shell is welded with the shell welding area of the negative busbar.

7. The battery system of claim 6, wherein, The welding line between the shell and the shell welding area is a curved welding line, and the curved welding line is a sinusoidal spiral line (30).

8. The battery system of claim 7, wherein, The welding boss (20) of the negative busbar corresponds to the center hole of the cell.

9. The battery system of claim 7, wherein, ​

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