Negative electrode connection sheet and battery structure

Abstract

The utility model provides a cathode connecting piece and a battery structure body. The negative electrode connecting piece is provided with a Z-shaped structure with a bottom and a top, the lower surface of the bottom and the lower surface of the top are taken as a reference, the height difference between the bottom and the top is more than 0.3 mm, and the lower surface of the bottom is a flat surface. According to the negative electrode connecting sheet, a battery structure body with good welding stability can be provided. The battery structure body provided by the utility model is provided with a battery and the negative electrode connecting piece.

Description

Technical Field

[0001] This utility model relates to a negative electrode connecting piece and a battery structure. Background Technology

[0002] In recent years, with the development of portable electronic devices, the demand for batteries, which power these electronic products, has been increasing. In some electronic devices, it is necessary to integrate other components, such as substrates, onto the battery. In this case, it is necessary to weld connecting components onto the battery's electrodes to achieve the connection between the battery and other components.

[0003] For example, it is quite common to integrate substrates and other components into high-capacity batteries such as CR17455 lithium batteries and use them as a single unit in electronic devices. The CR17455 lithium battery is a standard model of lithium battery, referring to a cylindrical battery with a diameter of 17mm and a length of 45.5mm. Its typical shape features a convex positive electrode and a concave negative electrode. Therefore, different positive and negative electrode connection components are used.

[0004] As a negative electrode connection component, a negative electrode connection piece is usually used. Figure 1 , Figure 2 This is a schematic diagram of the existing negative electrode connector and battery structure. The existing negative electrode connector is designed as an elliptical convex structure, which can correspond to the concave part of the negative electrode, ensuring that the connector and the negative electrode can achieve a complete fit.

[0005] The existing negative electrode connectors have several shortcomings: The effective welding area is compact due to the concave shape, affecting welding operability, reducing efficiency, and further deteriorating welding stability. The concave design causes fumes generated during laser welding to adhere to the edges of the concave shape, preventing proper exhaust and resulting in poor appearance or even rework. The concave shapes of the battery surface and the negative electrode connector are both elliptical, preventing complete fit and creating gaps that affect welding stability and may even lead to detachment. Furthermore, the connector's perfectly regular shape makes reverse bonding impossible, requiring visual inspection, which is time-consuming, inefficient, and increases processing costs. Utility Model Content

[0006] The technical problem to be solved

[0007] In view of the many shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a negative electrode connecting piece that can improve welding efficiency and welding stability. A further technical problem to be solved by this utility model is to provide a battery structure with high welding stability.

[0008] Technical means for solving technical problems

[0009] To solve the above-mentioned technical problems, one embodiment of the present invention provides a negative electrode connecting piece with a Z-shaped structure having a bottom and a top. The height difference between the lower surface of the bottom and the lower surface of the top is 0.3 mm or more, and the lower surface of the bottom is a flat surface.

[0010] According to the above negative electrode connecting piece, the upper surface of the bottom can be a flat surface.

[0011] Based on the aforementioned negative electrode connector, the bottom can be rectangular in shape.

[0012] According to the aforementioned negative electrode connecting piece, the width of the effective welding area on the bottom for performing welding can be greater than 3.6 mm and less than 5.0 mm.

[0013] Based on the aforementioned negative electrode connecting piece, the aforementioned rectangular shape may have rounded corners and / or chamfers.

[0014] Based on the aforementioned negative electrode connecting piece, the rectangular shape may have a chamfer.

[0015] According to the above negative electrode connecting piece, a boss can be provided on the upper surface of the bottom, and the top of the boss is coplanar with the upper surface of the top.

[0016] Based on the aforementioned negative electrode connector, the aforementioned boss can have a cross shape.

[0017] According to the above negative electrode connecting piece, the length and width of the cross shape can be in the range of 0.3mm to 0.5mm.

[0018] Another embodiment of the present invention provides a battery structure comprising a battery and the aforementioned negative electrode connecting piece.

[0019] Effects of the utility model

[0020] The negative electrode connector of this invention, due to its Z-shaped structure, increases the welding area, thereby improving welding efficiency and stability. Furthermore, the battery structure of this invention exhibits high welding stability, resulting in enhanced quality. Attached Figure Description

[0021] Figure 1 This is a schematic top view of the negative electrode connector in existing technology.

[0022] Figure 2 This is a schematic diagram of a battery structure in the prior art.

[0023] Figure 3 This is a schematic top view of an example of a negative electrode connecting piece according to one embodiment of the present invention.

[0024] Figure 4This is a schematic diagram of an example of a battery structure according to one embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of another example of a battery structure according to one embodiment of the present invention.

[0026] Figure 6 yes Figure 5 A schematic top view of the battery structure shown.

[0027] Figure 7 yes Figure 5 A schematic front view of the battery structure shown.

[0028] Explanation of reference numerals in the attached figures

[0029] 1, 2: Negative electrode connecting piece

[0030] 11: Flat area

[0031] 12: Convex hull

[0032] 21: Top

[0033] 22: Bottom

[0034] 23: Connecting part

[0035] 24: Effective welding area

[0036] 25: Protrusion

[0037] C: Battery Detailed Implementation

[0038] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. The described embodiments are merely exemplary and can take many different forms. Furthermore, the drawings disclosed in this specification are, in principle, intended for schematic illustration. That is, the dimension ratios in the drawings may not necessarily match the actual dimension ratios, and the dimension ratios may not be consistent between different drawings. For the same components or constituent elements, reference numerals may sometimes be omitted.

[0039] Furthermore, in this specification, the negative electrode connector is defined as being in its usable state, i.e., welded and fixed to the battery, based on this. The side of the negative electrode connector closer to the battery is defined as "down," and the side farther from the negative electrode is defined as "up." The terms "down" and "up" are relative definitions with the battery as the reference frame. In other reference frames, "down" may also be "up," and "up" may also be "down."

[0040] Figure 1 , Figure 2The diagram illustrates a schematic structure of a prior art negative electrode connector and battery structure. The existing negative electrode connector 1 includes a flat portion 11 and a protrusion 12 located at the center of the flat portion 11. The protrusion 12 has a flat bottom surface and a certain height to correspond to the concave portion of the negative electrode, thereby enabling the flat bottom surface of the protrusion 12 to fit snugly against the negative electrode. Simultaneously, the flat bottom surface of the protrusion 12 forms a welding area, and by welding in this area, the negative electrode connector 1 can be fixed to the negative electrode of the battery C.

[0041] On the one hand, when welding the negative electrode connecting piece, four-point welding is usually required, that is, welding is carried out at four points in a welding area to ensure welding stability and quality.

[0042] However, the existing negative electrode connector 1, which includes a flat portion 11 and a protrusion 12 located in the center of the flat portion 11, is obtained, for example, by processing the sheet material through stamping. Therefore, due to limitations in the stamping process, a significant amount of the flat portion 11 remains around the protrusion 12, making it difficult to adhere to and weld with the negative electrode. In other words, the effective welding area becomes very compact. This results in poor welding operability and low efficiency when performing four-point welding within the limited effective welding area, and may even lead to decreased welding stability.

[0043] On the one hand, the welding of the negative electrode connector is usually done by laser welding. Due to the protrusion 12, the fumes generated during laser welding will adhere to the edge of the protrusion 12 and cannot be discharged, resulting in poor appearance and even rework.

[0044] On the one hand, due to limitations in stamping processes, the negative electrode surface of battery C and the protrusion 12 of negative electrode connecting piece 1 are both elliptical, and the two cannot be completely fitted together, resulting in gaps that affect welding stability and may even lead to desoldering.

[0045] On the other hand, the negative electrode connector 1 has a completely regular shape, which makes it impossible to prevent reverse bonding in automated production processes. This means that the connector 1 may be supplied to the welding process with the convex 12 facing upwards, making it impossible to attach the negative electrode connector 1 to the negative electrode of the battery C and perform welding. To prevent reverse bonding, manual inspection is required, which leads to increased labor time, low efficiency, and consequently, increased processing costs.

[0046] Next, the negative electrode connecting piece and battery structure of one embodiment of the present invention will be described.

[0047] Figure 3 This is a schematic top view of an example of the negative electrode connecting piece in this embodiment. Figure 4 This is a schematic diagram of an example of the battery structure of this embodiment.

[0048] As shown in the figure, the negative electrode connecting piece 2 of this embodiment has a Z-shaped structure with a bottom 22 and a top 21. The height difference between the lower surface of the bottom 22 and the lower surface of the top 21 is 0.3 mm or more, and the lower surface of the bottom 22 is a flat surface.

[0049] By employing a Z-shaped structure design, and ensuring that the height difference between the lower surface of the bottom 22 and the lower surface of the top 21 is at least 0.3 mm, and that the lower surface of the bottom 22 is flat, it can correspond to the concave portion of the negative electrode, thereby achieving a close fit between the bottom 22 and the negative electrode of the battery C. Furthermore, since there is no protrusion, the bottom 22 can be integrally bonded and welded to the negative electrode of the battery C, eliminating the numerous dead spaces caused by the protrusion 12 that prevent bonding and welding with the negative electrode. In other words, in this embodiment, the effective welding area 24 is increased. Taking a battery of the CR17455 model as an example, if... Figure 1 The existing negative electrode connector 1 shown is limited by the size of the protrusion 12, and the maximum effective welding area is only 6.1 mm long and 3.6 mm wide. In contrast, when using the negative electrode connector 2 of this embodiment, the minimum effective welding area 24 can reach 6.9 mm long and 5 mm wide. As a result, welding operability is improved, efficiency is increased, and welding stability is better, for example, when performing four-point welding.

[0050] In addition, in the negative electrode connecting piece 2 of this embodiment, since the bottom 22 is not an elliptical shape like the convex 12 of the prior art negative electrode connecting piece 1, it can be completely fitted with the negative electrode surface of the battery C without gaps, which improves welding stability, further suppresses desoldering, and improves quality.

[0051] In the negative electrode connecting piece 2 of this embodiment, the bottom 22 and the top 21 are connected by a connecting portion 23. The slope of the connecting portion 23 is not particularly limited as long as it does not affect the effect of this invention; for example, it can be 90° or 45°.

[0052] The bottom 22, the connecting portion 23, and the top 21 are preferably an integrated structure. As a method for manufacturing such a negative electrode connecting piece 2, for example, commercially available sheets can be punched into a predetermined shape and then stamped and bent into a negative electrode connecting piece 2 having the structure of this embodiment.

[0053] In the negative electrode connector 2 of this embodiment, the upper surface of the bottom 22 can be a flat surface. This is advantageous in terms of raw material supply. Moreover, by making it a flat surface, it is easier to exhaust fumes caused by laser welding, improving appearance quality, reducing rework, increasing production efficiency, and thus saving costs.

[0054] In the negative electrode connecting piece 2 of this embodiment, the shape of the bottom 22 is not particularly limited as long as it does not affect the effect of this utility model. For example, it can be circular, elliptical, rectangular, etc., with a rectangular shape being preferred. Generally speaking, the negative electrode of a cylindrical battery is circular, so a circular connecting piece can cover the negative electrode to the maximum extent, thereby increasing the effective welding area. However, even if the negative electrode connecting piece 2 of this embodiment is rectangular, a large effective welding area 24 can be achieved. At the same time, the rectangular shape means that the material used for the negative electrode connecting piece 2 can be reduced compared to a circular shape, that is, cost savings. In other words, by making the negative electrode connecting piece 2 rectangular, welding stability and cost can be balanced, and therefore it is preferred.

[0055] The aforementioned rectangular shape may have rounded corners and / or chamfers. Preferably, the rectangular shape has one chamfer. By providing a chamfer, automated anti-reverse operation of the negative electrode connector 2 can be achieved, reducing manual visual inspection, lowering processing costs, and improving overall benefits. The chamfer can be obtained, for example, by cutting off a portion from one side of the tail end of the negative electrode connector 2. There are no particular limitations on the size of the cut-off portion, as long as it does not affect the effect of this invention. Taking a CR17455 battery as an example, for instance, 0.5mm can be cut off from one side of the tail end of the negative electrode connector 2. 2 This allows for both effective welding and anti-reverse welding.

[0056] The following describes another example of the negative electrode connector and battery structure of this embodiment.

[0057] Figure 5 This is a schematic diagram of another example of a battery structure according to one embodiment of the present invention. Figure 6 yes Figure 5 A schematic top view of the battery structure shown. Figure 7 yes Figure 5 A schematic front view of the battery structure shown.

[0058] For the same components or constituent elements, please refer to the corresponding descriptions above, which will not be repeated here.

[0059] As shown in the figure, in the negative electrode connecting piece 2 of this example, a boss 25 is provided on the upper surface of the bottom 22.

[0060] By adopting this configuration, when welding, pressing the aforementioned boss 25 can make the lower surface of the aforementioned bottom 22 completely fit with the negative electrode of the battery C, thereby increasing welding stability and achieving a connection piece structure with almost no gaps.

[0061] There are no particular restrictions on the shape of the aforementioned boss 25 as long as it does not affect the effect of this utility model; a cross shape is preferred. While the area of ​​the effective welding region will decrease accordingly after setting the boss 25, a cross shape can balance the effect of the boss and the area of ​​the effective welding region. To further balance the effect of the boss and the area of ​​the effective welding region, the length and width of the cross shape can be within the range of 0.3mm to 0.5mm.

[0062] There are no particular limitations on the height of the aforementioned cross shape, as long as it does not affect the effect of this invention; for example, it can be 0.3 mm or more. Preferably, the top of the aforementioned boss 25 is coplanar with the upper surface of the aforementioned bottom 21, thereby further increasing the welding stability during welding.

[0063] Another embodiment of the present invention includes a battery structure comprising a battery C and the aforementioned negative electrode connecting piece 2.

[0064] There are no particular limitations on battery C as long as it does not affect the effect of this utility model; for example, a typical example is a cylindrical battery. Cylindrical generally refers to a round shape, but it is not limited to this, and also includes non-standard cylindrical shapes, cylindrical shapes with non-circular bases, etc. Battery C can be, for example, a secondary battery. Based on the carrier type, battery C can be a lithium battery, nickel-metal hydride battery, fluorine-ion battery, air battery, etc. Based on the electrolyte type, battery C can be a liquid battery, semi-solid battery, solid battery, etc. Based on the internal structure, battery C can be a wound type, a stacked type, etc.

[0065] In the battery structure of this embodiment, the negative electrode connecting piece 2 is welded and fixed to the negative electrode of the battery C. Other components can be selected arbitrarily as needed, and there are no particular limitations as long as they do not affect the effect of this invention.

[0066] The above describes some embodiments of the present invention, but is not limited to the above embodiments. Various modifications can be made without departing from the spirit of the present invention.

[0067] The advantages and improvements of this invention will be readily understood by those skilled in the art upon reading this specification, and therefore the scope of this invention is not limited to the foregoing typical examples and specific details. Thus, various modifications can be made to this invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

Claims

1. A negative electrode connector, characterized in that, It has a Z-shaped structure with a bottom and a top. With the lower surface of the bottom and the lower surface of the top as references, the height difference between them is greater than 0.3 mm. The bottom surface is flat.

2. The negative electrode connector according to claim 1, characterized in that, The upper surface of the bottom is flat.

3. The negative electrode connector according to claim 1 or 2, characterized in that, The bottom is rectangular in shape.

4. The negative electrode connector according to claim 3, characterized in that, The width of the effective welding area on the bottom for welding is greater than 3.6 mm and less than 5.0 mm.

5. The negative electrode connector according to claim 3, characterized in that, The rectangular shape has rounded corners and / or chamfers.

6. The negative electrode connector according to claim 5, characterized in that, The rectangular shape has a chamfer.

7. The negative electrode connector according to claim 1, characterized in that, A boss is provided on the upper surface of the bottom, and the top of the boss is coplanar with the upper surface of the top.

8. The negative electrode connector according to claim 7, characterized in that, The boss has a cross shape.

9. The negative electrode connector according to claim 8, characterized in that, The length and width of the cross shape are in the range of 0.3mm to 0.5mm.

10. A battery structure, characterized in that, It comprises a battery and a negative electrode connector as described in any one of claims 1 to 9.

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