Connecting piece and battery pack

Abstract

The utility model discloses a connecting piece and a battery pack, the connecting piece comprises a first connecting end and a second connecting end, a bending area is formed between the first connecting end and the second connecting end, at least one arc-shaped buffer section is arranged between the first connecting end and the second connecting end, and the arc-shaped buffer section and the bending area are configured to be connected or at least partially coincide. The anti-seismic structure has the beneficial effects of being stable in structure and good in anti-seismic effect, the stress borne by the bending area can be dispersed through the arc-shaped buffering sections, and therefore the probability that the bending area is damaged and fractured is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage batteries, and in particular to a connecting piece and a battery pack. Background Art

[0002] With the development of battery manufacturing technology, there are more and more cordless battery-powered power tools on the market that use energy storage batteries as power sources. The power source in power tools generally exists in the form of battery packs. As one of the core components of such power tools, the performance and stability of the battery pack are directly related to the stability and service life of the power tools. The battery pack generally needs to be connected to components such as battery cells, batteries, modules, battery management systems, etc. through metal connecting plates such as nickel sheets to achieve current transmission and distribution.

[0003] However, the existing connecting pieces have the following defects: the bending areas of the connecting pieces in the battery pack are mostly right-angled, and their structural strength is weaker than the structural strength of other positions of the connecting pieces. When using power tools, especially impact tools, due to the large vibration, the vibration will be transmitted to the PCB and the nickel sheet of the battery pack, and the right-angled connecting pieces can be easily broken by the vibration. Summary of the Invention

[0004] One purpose of the present application is to provide a connecting piece and a battery pack with good shock resistance.

[0005] To achieve the above objectives, the technical solution adopted in this application is: a connecting piece, comprising a first connecting end and a second connecting end, a bending area is formed between the first connecting end and the second connecting end, at least one arc-shaped buffer segment is arranged between the first connecting end and the second connecting end, the arc-shaped buffer segment and the bending area are configured to be connected or at least partially overlap, and the arc-shaped buffer segment is suitable for undergoing elastic deformation to release the stress applied to the bending area.

[0006] In some embodiments, the bending area is formed in a first plane, the surface of the bending area is parallel to the first plane, and the arc-shaped buffer section is suitable for bending and forming in the first plane, and / or suitable for bending and forming in a second plane perpendicular to the first plane.

[0007] In some embodiments, the arc-shaped buffer segment at least partially overlaps with the bending area.

[0008] In some embodiments, the arc-shaped buffer segment at least covers the bending position of the bending area.

[0009] In some embodiments, the curvature of the arc-shaped buffer segment is greater than the bending angle of the bending position of the bending area.

[0010] In some embodiments, the width of the middle portion of the arc-shaped buffer segment is smaller than the width of both ends of the arc-shaped buffer segment.

[0011] In some embodiments, the connecting piece further includes a third connecting end, a retreat opening is formed between the second connecting end and the third connecting end in the first plane, and a middle portion of the arc-shaped buffer segment bends toward the retreat opening.

[0012] In some embodiments, the arc-shaped buffer section is connected to the bending area, and the surface of the arc-shaped buffer section that is connected to a side surface of the bending area is bent in a direction perpendicular to the first plane.

[0013] In some embodiments, when the bending region is subjected to stress, the arc-shaped buffer segment is adapted to deform before the bending region, or to deform synchronously with the bending region.

[0014] A battery pack comprises any of the above-mentioned connecting pieces.

[0015] Compared with the prior art, the beneficial effect of the present application is that the connecting piece of the present application, by establishing an arc-shaped buffer section, can help release stress in the original bending area of ​​the connecting piece through the elastic deformation of the arc-shaped buffer section, prevent stress from concentrating in the bending area, thereby improving the seismic performance of the bending area, and greatly reducing the probability of the connecting piece breaking in the bending area, so that the battery pack using the connecting piece can have higher stability and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall structural view of the connecting piece according to the prior art of this application.

[0017] Figure 2 This is an overall structural view of a preferred embodiment of a connecting piece according to the present application when the arc-shaped buffer section and the bending area at least partially overlap.

[0018] Figure 3 This is a top view of a preferred embodiment of a connecting piece according to the present application, in which the arc-shaped buffer section and the bending area at least partially overlap.

[0019] Figure 4 This is a diagram of the overall structure of a preferred embodiment of a connecting piece according to the present application when the arc-shaped buffer section is connected to the bending area.

[0020] Figure 5 This is a right side view of a preferred embodiment of a connecting piece according to the present application where the arc-shaped buffer section is connected to the bending area.

[0021] Figure 6 It is an exploded structural view of a preferred embodiment of a battery pack according to the present application.

[0022] In the figure: 1. Connecting piece; 11. First connecting end; 12. Second connecting end; 13. Third connecting end; 14. Bending area; 141. Bending position; 15. Arc-shaped buffer section; 16. Recess; 2. Battery pack; 21. Battery cell. DETAILED DESCRIPTION

[0023] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0025] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0026] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0027] The present application will be further described below with reference to the accompanying drawings:

[0028] like Figures 1 to 6As shown, the present application provides a connecting piece 1, including a first connecting end 11 and a second connecting end 12, and a bending area 14 is formed between the first connecting end 11 and the second connecting end 12. The reason for the existence of the bending area 14 is mainly because the battery cell 21 and the circuit board are limited by space, structural design and connection stability. It is difficult to use a wire for direct connection, and it is necessary to use the connecting piece 1 to extend the connection along the side of the battery cell 21. In this process, one or more bending areas 14 are usually designed on the connecting piece 1, and some of the bending areas 14 may have low structural strength, and there is a risk of breakage when subjected to vibration.

[0029] It can be understood that the bending area 14 mentioned in this application refers to an area that is prone to the risk of breakage, and does not mean that there is only a single bending area 14 on the connecting piece 1. There may be multiple bending areas 14 on the connecting piece 1, but other bending areas 14 are not prone to the risk of breakage.

[0030] In the present application, the material of the connecting piece 1 is generally a conductive metal material, preferably nickel metal material.

[0031] As an improvement, at least one arc-shaped buffer section 15 is provided between the first connection end 11 and the second connection end 12, and at least one arc-shaped buffer section 15 is configured at each bending area 14, and the arc-shaped buffer section 15 and the bending area 14 are configured to be connected or at least partially overlapped to ensure the structural connection between the arc-shaped buffer section 15 and the bending area 14. The arc-shaped buffer section 15 is suitable for elastic deformation to release the stress applied to the bending area 14. It can be understood that after the arc-shaped buffer section 15 helps the bending area 14 to release the stress, the bending area 14 can reduce or even eliminate the deformation to be produced when subjected to the same stress, thereby reducing structural fatigue and improving the stability and service life of the bending area.

[0032] The existence of the arc buffer section 15 can be used in the original right-angle bending area 14 (refer to Figure 1 At least one side of the connecting piece 1 helps to buffer it, and in the arc state, the elastic deformation performance of the connecting piece 1 can become stronger, which can effectively disperse the stress on the right-angled bending area 14 and prevent the stress from being concentrated in the right-angled bending area 14, thereby improving the stability of the right-angled bending area 14 to achieve an anti-seismic effect.

[0033] Based on the function and principle of the arc-shaped buffer section 15, the relationship between the arc-shaped buffer section 15 and the bending area 14 can be further optimized. When the bending area 14 is configured to be subjected to stress, the arc-shaped buffer section 15 is suitable for deforming before the bending area 14, or deforming synchronously with the bending area 14, so that the stress transmitted from the first connection end 11 and the second connection end 12 to the bending area 14 can be received by the arc-shaped buffer section 15 as much as possible in advance, and then the buffering performance advantage of the arc-shaped buffer section 15 itself is used to offset this part of the stress, thereby further reducing the stress on the bending area 14.

[0034] In some embodiments, the deformation sequence between the arc-shaped buffer section 15 and the bending area 14 can be achieved by changing the material thickness of both.

[0035] In some embodiments, the deformation sequence between the arc-shaped buffer section 15 and the bending area 14 can be achieved by using materials with different elastic deformation capabilities for the two.

[0036] Specifically, the arc-shaped buffer section 15 can be provided in at least two forms:

[0037] One is: Figures 1 to 3 As shown, the bending area 14 is formed in a first plane, and the arc-shaped buffer segment 15 is suitable for being bent and formed in the first plane, or suitable for being bent and formed in a second plane perpendicular to the first plane.

[0038] The arc-shaped buffer section 15 of this configuration can effectively release the stress on the bending area 14 in the direction within the first plane, and can also have a certain releasing effect on the stress on the bending area 14 in the direction perpendicular to the first plane.

[0039] In some embodiments, the arc-shaped buffer section 15 at least partially overlaps with the bending area 14, and the arc-shaped buffer section 15 at least replaces the bending position 141 in the bending area 14. Since the bending position 141 in the traditional bending area 14 is usually an angle structure, when the first connection end 11 and the second connection end 12 transfer stress to the angle structure, shear force will be formed on both sides of the angle structure, thereby accelerating the structural fatigue at the angle structure, resulting in fracture. By replacing part of the structure of the bending area 14 with the arc-shaped buffer section 15, the transition of the bending area 14 can be made smoother, the generation of shear force can be reduced, and the structural fatigue caused by vibration of the bending position 141 can be effectively alleviated.

[0040] The arc-shaped buffer section 15 may partially replace the bending position 141 in the bending area 14 , or may replace one or more bending positions 141 in the bending area 14 .

[0041] In some embodiments, the curvature of the arc-shaped buffer section 15 (refer to Figure 3The angle α in the bending angle) is greater than the bending angle at the bending position 141 in the bending area 14 it replaces. For the arc structure, the larger the curvature, the longer the path through which the stress is transferred. Therefore, by increasing the bending curvature of the arc buffer segment 15, the ability of the arc buffer segment 15 to absorb, disperse and withstand greater stress can be effectively increased. By making the bending curvature of the arc buffer segment 15 greater than the bending angle at the bending position 141 in the bending area 14 it replaces, it can be ensured that after the arc buffer segment 15 replaces part of the bending area 14, the buffering capacity of the bending area 14 can be improved.

[0042] In some embodiments, the width of the middle portion of the arc-shaped buffer segment 15 is smaller than the width at both ends of the arc-shaped buffer segment 15. This design can enhance the elastic deformation ability of the middle portion of the arc-shaped buffer segment 15, thereby enabling the arc-shaped buffer segment 15 to obtain a better effect of receiving and releasing stress.

[0043] It is worth noting that the minimum width of the middle portion of the arc-shaped buffer section 15 is suitable for being obtained through vibration testing, thereby ensuring that the arc-shaped buffer section 15 is effective while not affecting the stability and service life of the connecting piece 1.

[0044] like Figure 3 In the embodiment shown, the connecting piece 1 further includes a third connecting end 13, a retreat opening 16 is formed between the second connecting end 12 and the third connecting end 13 in the first plane, and the middle portion of the arc-shaped buffer section 15 is bent toward the retreat opening 16. In this application, the first connecting end 11 is usually connected to the electrode of the battery cell 21, and the second connecting end 12 and the third connecting end 13 are usually bent to the side of the battery cell 21 to connect to components such as the circuit board. Due to the limited space on the side of the battery cell 21, the second connecting end 12 and the third connecting end 13 are usually located at the bottom of the battery cell 21. In the same plane, in addition, since the arc-shaped buffer section 15 will occupy more space in the first plane after replacing the covering bending area 14 compared to the right-angled bending area 14 in the traditional connecting piece 1, it is necessary to set a retreat opening 16 between the second connecting end 12 and the third connecting end 13 to improve space utilization and reduce the probability of structural interference. The volume of the arc-shaped buffer section 15 can also be designed to be larger to further increase the seismic performance of the arc-shaped buffer section 15, thereby improving the stability and service life of the connecting piece 1.

[0045] The second is: Figures 4 to 5 As shown, the arc-shaped buffer section 15 is connected to the bending area 14 , and the arc-shaped buffer section 15 is bent in a direction perpendicular to the first plane on the surface connected to one side surface of the bending area 14 .

[0046] The arc-shaped buffer section 15 of this configuration can effectively release the stress on the bending area 14 in the direction perpendicular to the first plane, and can also have a certain releasing effect on the stress on the bending area 14 in the direction within the first plane.

[0047] It can be understood that the above two types of settings of the arc-shaped buffer section 15 can also be combined, that is, they are bent in the first plane and in the second plane perpendicular to the first plane at the same time to form an effective absorption, dispersion and release effect on the stress of the bending area 14 in all directions.

[0048] The above two configurations of the arc-shaped buffer section 15 can be selected according to actual needs. In addition, the number of arc structures in the arc-shaped buffer section 15 can also be selected according to actual needs.

[0049] In particular, the first arrangement of the arc-shaped buffer segment 15 is more suitable for situations where the space around the battery cell 21 is narrow, and can effectively reduce the volume and cost while achieving an anti-vibration effect.

[0050] like Figure 5 In the embodiment shown, the main shape of the cross section of the arc-shaped buffer section 15 is an N-shape. The larger the curvature of the arc-shaped buffer section 15 is, the better the stress dispersion effect on the bending area 14 is.

[0051] The present application also provides a battery management system, including the connecting piece 1 of any of the above embodiments. The battery management system can be connected to the battery cell 21 or the battery cell 21 module through the connecting piece 1 of the present application.

[0052] like Figure 6 As shown, the present application also provides a battery pack 2, comprising the connecting piece 1 of any of the above embodiments.

[0053] It can be understood that the connecting piece 1 in the present application can be used in the battery pack 2, and the first connecting end 11 is usually connected to the electrode of the battery cell 21 or the battery cell 21 module, and the second connecting end 12 and the third connecting end 13 are usually connected to the circuit board. The optimized connecting piece 1 can enhance the stability of the electrical connection between the battery cell 21 and the circuit board.

[0054] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A connecting piece, characterized in that: It includes a first connecting end and a second connecting end, a bending area is formed between the first connecting end and the second connecting end, and at least one arc-shaped buffer segment is provided between the first connecting end and the second connecting end, the arc-shaped buffer segment and the bending area are configured to be connected or at least partially overlap, and the arc-shaped buffer segment is suitable for undergoing elastic deformation to release the stress on the bending area.

2. A connecting piece according to claim 1, characterized in that: The bending area is formed in a first plane, the surface of the bending area is parallel to the first plane, and the arc-shaped buffer section is suitable for bending and forming in the first plane, and / or suitable for bending and forming in a second plane perpendicular to the first plane.

3. A connecting piece according to claim 2, characterized in that: The arc-shaped buffer section at least partially overlaps with the bending area.

4. A connecting piece according to claim 3, characterized in that: The arc-shaped buffer section at least covers the bending position of the bending area.

5. A connecting piece according to claim 4, characterized in that: The curvature of the arc-shaped buffer section is greater than the bending angle of the bending position of the bending area.

6. A connecting piece according to claim 3, characterized in that: The width of the middle portion of the arc-shaped buffer segment is smaller than the width of both ends of the arc-shaped buffer segment.

7. The connecting piece according to claim 3, characterized in that: The connecting piece further includes a third connecting end, a retreat opening is formed between the second connecting end and the third connecting end in the first plane, and a middle portion of the arc-shaped buffer segment is bent toward the retreat opening.

8. The connecting piece according to claim 2, wherein: The arc-shaped buffer section is connected to the bending area, and the surface of the arc-shaped buffer section that is connected to one side surface of the bending area is bent in a direction perpendicular to the first plane.

9. The connecting piece according to claim 1, wherein: When the bending area is subjected to stress, the arc-shaped buffer section is suitable for deforming before the bending area, or deforming synchronously with the bending area.

10. A battery pack, characterized in that: The connecting piece comprises the connecting piece according to any one of claims 1 to 8.

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