Battery connecting piece, battery pack and electric equipment

Abstract

The utility model relates to a battery connecting piece, a battery pack and electric equipment. The battery connecting piece comprises a first conductive piece, the second conducting strip extends outwards from at least one end of the first conducting strip, the second conducting strip comprises a spot welding area and a slot dividing the spot welding area into two parts, and the slot extends out of the spot welding area; wherein the connecting part of the second conducting strip and the first conducting strip is step-shaped, and the second conducting strip is parallel to the first conducting strip. According to the scheme provided by the invention, potential safety hazards can be reduced.

Description

Technical Field

[0001] This application relates to the field of new energy technologies, and particularly to a battery connection piece, a battery pack, and an electrical device. Background Art

[0002] At present, flat connection pieces are often used for cylindrical batteries connected in series in a battery pack. The flat connection piece will contact the sleeve at the negative electrode ring position of a single battery. In related technologies, an insulating sheet is added between the flat connection piece and the sleeve. When passing through a continuous large current, the connection piece generates heat, which will cause the insulating sheet and the sleeve to melt, resulting in a short circuit. At the same time, adding the insulating sheet will also lead to low production efficiency and high labor costs. When the height of the positive electrode cap and the negative electrode ring is basically level, it will also cause a height difference between the flat connection piece and the positive electrode cap due to the presence of the insulating sheet, resulting in spot welding explosion welding. Summary of the Utility Model

[0003] To solve or partially solve the problems existing in related technologies, this application provides a battery connection piece, a battery pack, and an electrical device, which reduce potential safety hazards compared with related technologies.

[0004] In the first aspect of this application, a battery connection piece is provided, including:

[0005] A first conductive sheet;

[0006] A second conductive sheet extending outward from at least one end of the first conductive sheet. The second conductive sheet includes a spot welding area and a slot that divides the spot welding area into two, and the slot extends out of the spot welding area;

[0007] Wherein, the connection part of the second conductive sheet and the first conductive sheet is in a stepped shape, and the second conductive sheet and the first conductive sheet are parallel to each other.

[0008] In one embodiment, the number of the second conductive sheets is two, and the two second conductive sheets are correspondingly arranged at both ends of the first conductive sheet.

[0009] In one embodiment, the thickness range of the battery connection piece is 0.15 mm to 0.5 mm.

[0010] In one embodiment, at least one side of the first conductive sheet is provided with a groove.

[0011] In one embodiment, the width range of the first conductive sheet is 6 mm to 30 mm.

[0012] In one embodiment, the slot extends inward from the free end of the second conductive sheet.

[0013] In the second aspect of this application, a battery pack is provided, including:

[0014] At least one battery connection piece, the battery connection piece including the battery connection piece as described above.

[0015] In one embodiment, the battery connection piece includes a first conductive piece and two second conductive pieces, the two second conductive pieces correspondingly connecting two adjacent single cells in the battery pack; or,

[0016] The battery connection piece includes a first conductive piece and a second conductive piece, the second conductive piece connecting the single cell in the battery pack, and the other end of the first conductive piece connecting the output end of the battery pack.

[0017] In one embodiment, the battery pack includes at least two battery connection pieces with different widths of the first conductive pieces, wherein the minimum width of at least two of the first conductive pieces is a preset width.

[0018] The third aspect of the present application provides an electrical device including the battery pack as described above.

[0019] The technical solution provided by the present application may include the following beneficial effects:

[0020] The battery connection piece provided by the present application includes a first conductive piece and a second conductive piece extending outward from at least one end of the first conductive piece. The second conductive piece includes a spot welding area and a slot dividing the spot welding area into two, and the slot extends out of the spot welding area; wherein, the connecting part of the second conductive piece and the first conductive piece is stepped, and the second conductive piece and the first conductive piece are parallel to each other. In the technical solution of the present application, the second conductive piece and the first conductive piece are parallel to each other, and the connecting part of the second conductive piece and the first conductive piece is stepped. The second conductive piece and the first conductive piece are not in the same plane, and it is not necessary to additionally provide an insulating sheet to avoid contact between the battery connection piece and the battery negative electrode ring sleeve, reducing potential safety hazards; and, the slot on the second conductive piece divides the spot welding area into two and the slot extends out of the spot welding area, then the spot welding current will bypass the slot from one solder joint to another solder joint. Compared with the conventional current directly from one solder joint to another solder joint, the current arc is lengthened, the internal resistance during spot welding is increased, thereby strengthening the firmness of the solder joints, improving the stability of the battery connection piece on the battery pack as a connecting component, and further reducing potential safety hazards.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features and advantages of the present application will become more obvious. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0023] Figure 1 is a top view of a battery connection piece shown in an embodiment of the present application;

[0024] Figure 2 is a top view of a battery connection piece shown in another embodiment of the present application;

[0025] Figure 3 is a front view of a battery connection piece shown in another embodiment of the present application;

[0026] Figure 4 is a schematic top view of the current path during spot welding of a common connection piece;

[0027] Figure 5 is a schematic top view of the current path during spot welding of a battery connection piece shown in an embodiment of the present application;

[0028] Figure 6 is a schematic diagram of the distribution of the slot on the second conductive sheet of the battery connection piece shown in an embodiment of the present application;

[0029] Figure 7 is an assembly schematic diagram of a battery connection piece and two single batteries shown in an embodiment of the present application;

[0030] Figure 8 is a schematic top view of a battery pack shown in an embodiment of the present application.

[0031] Reference numerals: 1, first conductive sheet; 11, groove; 2, second conductive sheet; 21, spot welding area; 22, slot; 23, solder joint; 3, battery pack; 31, single battery; 32, output terminal; 4, spot welding part; 41, first solder joint. Detailed implementation manners

[0032] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0033] The terms used in the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0034] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0035] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0036] Unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Flat sheet connecting pieces are often used in cylindrical batteries connected in series in a battery pack, and the flat sheet connecting pieces will contact the sleeve at the negative electrode ring position of a single battery. In the related art, an insulating sheet is added between the flat sheet connecting piece and the sleeve. When passing a continuous large current, the connecting piece generates heat, which will cause the insulating sheet and the sleeve to melt and cause a short circuit.

[0038] In view of the above problems, the embodiment of this application provides a battery connecting piece, which can reduce potential safety hazards compared with the related art.

[0039] The technical solutions of the embodiments of this application will be described in detail below with reference to the drawings.

[0040] See Figures 1 to 3 , the embodiment of this application provides a battery connecting piece, including:

[0041] The first conductive sheet 1;

[0042] A second conductive sheet 2 extending outward from at least one end of the first conductive sheet 1, the second conductive sheet 2 including a spot welding area 21 and a slot 22 that bisects the spot welding area 21, and the slot 22 extending beyond the spot welding area 21;

[0043] Wherein, the connecting portion of the second conductive sheet 2 and the first conductive sheet 1 is stepped, and the second conductive sheet 2 and the first conductive sheet 1 are parallel to each other.

[0044] In this embodiment, the battery connection sheet serves as a connection bridge between two single cells 31, mainly including a first conductive sheet 1 and a second conductive sheet 2. The first conductive sheet 1 serves as a connection portion, and the second conductive sheet 2 serves as a spot welding portion. The second conductive sheet 2 and the first conductive sheet 1 are parallel to each other, and the connecting portion of the second conductive sheet 2 and the first conductive sheet 1 is stepped. As Figure 3 shown, the second conductive sheet 2 and the first conductive sheet 1 are not in the same plane, and there is no need to additionally provide an insulating sheet to avoid contact between the battery connection sheet and the battery negative electrode circle sleeve, reducing potential safety hazards. Also, the slot 22 on the second conductive sheet 2 bisects the spot welding area 21 and the slot 22 extends beyond the spot welding area 21. Then, the spot welding current will bypass the slot 22 from one solder joint to another solder joint. Compared with the conventional current directly from one solder joint to another solder joint, the current arc length is increased, and the internal resistance during spot welding is increased, thereby strengthening the firmness of the solder joints and improving the stability of the battery connection sheet on the battery pack 3 as a connecting component, further reducing potential safety hazards.

[0045] Wherein, the spot welding area 21 is the area where the solder joints are located, and it can accommodate multiple pairs of solder joints. In this embodiment, it can be two pairs of solder joints 23, that is, when the second conductive sheet 2 is connected to the single cell 31, there are two pairs of solder joints 23, that is, four solder joints 23, with two solder joints 23 on each side of the slot 22. As Figure 3 shown, Figure 3 is the current path during spot welding of a common connection sheet. Figure 4 is the current path during spot welding of the battery connection sheet in this embodiment. From Figure 3 it can be seen that in terms of current, the spot welding current is from one first solder joint 41 to another first solder joint 41 on the spot welding part 4, and then back from another first solder joint 41 to complete the spot welding. This type of spot welding is generally for connection sheets with a large internal resistance below 0.15 mm. And from Figure 4 it can be seen that in terms of current, the spot welding current will proceed from the position without the slot 22, that is, the spot welding current will bypass the slot 22 from one solder joint 23 to another solder joint 23, and then back from another solder joint 23 to complete the spot welding. This type of spot welding can be for connection sheets above 0.15 mm, preferably in the width range of 0.15 mm to 0.5 mm, or for sheet materials with a small internal resistance that are not easily spot welded. The large or small internal resistance can be determined by those skilled in the art according to actual requirements. Comparing Figure 4 andFigure 3 Regarding the current path in [reference], it can be found that in this embodiment, the current arc is lengthened, the internal resistance during spot welding is increased, thereby strengthening the firmness of the solder joint and improving the stability of the battery connection piece on the battery pack 3 as a connecting component, further reducing potential safety hazards. It can be seen that the thickness range of the battery connection piece in the embodiment of the present application is 0.15 mm to 0.5 mm. Optionally, the thickness is 0.15 mm.

[0046] In one embodiment, the slot 22 is provided on the second conductive sheet 2, as Figure 6 shown. However, in this embodiment, the slot 22 can extend the current arc during spot welding. However, in the manufacturing process of the battery connection piece, an additional mold needs to be opened, and the manufacturing process is relatively complex. Therefore, the slot 22 extends inward from the free end of the second conductive sheet 2. As Figure 1 and Figure 2 shown, the slot 22 extends inward along the length direction from the free end of the second conductive sheet 2. The manufacturing process is more convenient, and it is also easy to control the distribution position of the slot 22. Furthermore, the distribution position of the slot 22 on the spot welding area 21 can be better determined, which is conducive to mass production.

[0047] As Figure 7 and Figure 8 shown, the embodiment of the present application can be applied to a large current charge and discharge battery pack 3 with 10 or more cylindrical batteries connected in series. For the series connection of two adjacent single batteries 31, two spot welding parts need to be provided on the same battery connection piece, that is, the number of second conductive sheets 2 is two, and the two second conductive sheets 2 are correspondingly arranged at both ends of the first conductive sheet 1.

[0048] As Figure 8 shown, in another embodiment, the battery connection piece can connect the output terminal 32 of the battery pack 3 and the single battery 31. In this case, only one spot welding part is required. Therefore, the battery connection piece includes a first conductive sheet 1 and a second conductive sheet 2. The second conductive sheet 2 is connected to the single battery 31 in the battery pack 3, and the other end of the first conductive sheet 1 is connected to the output terminal 32 of the battery pack 3.

[0049] In one embodiment, at least one side of the first conductive sheet 1 is provided with a groove 11. When at least one side of the first conductive sheet 1 is provided with a groove 11, in the width direction, the first conductive sheet 1 can have a groove 11 or not. The maximum current that can flow through the battery connection piece with a groove 11 is relatively small. Then, the minimum cross-section of the first conductive sheet 1 can be determined through the groove 11 design. On the premise that the thickness of the battery connection piece is determined, the minimum width can be determined. It can be seen that this embodiment enables the battery connection piece to be regarded as a fuse in addition to being a connecting component. As Figure 8 shown, in this embodiment, a groove 11 is provided on both sides of the first conductive sheet 1.

[0050] Among them, the battery connecting piece can be stamped to form the first conductive piece 1 and the second conductive piece 2. The manufacturing process is simple.

[0051] In summary, the battery connecting piece provided by the embodiment of the present application can reduce potential safety hazards, and also realizes that the connecting piece is directly welded to the steel shells of the positive and negative electrodes of the single battery 31, avoiding contact with other materials, such as PVC (Polyvinyl Chloride), and reducing the melting of other materials when a large current passes through. Compared with the design scheme of adding an insulating sheet, this embodiment can reduce costs and thus increase the competitive advantage of the product.

[0052] See Figure 8 , the embodiment of the present application also provides a battery pack 3. The battery pack 3 provided by the present application includes:

[0053] At least one battery connecting piece, and the battery connecting piece includes the battery connecting piece as described above.

[0054] In one embodiment, the battery connecting piece includes a first conductive piece 1 and two second conductive pieces 2, and the two second conductive pieces 2 are correspondingly connected to two adjacent single batteries 31 in the battery pack 3. The embodiment of the present application can be applied to a large-current charge-discharge battery pack 3 with 10 or more cylindrical batteries connected in series. Then, for the series connection of two adjacent single batteries 31, two spot welding parts are required on the same battery connecting piece, that is, the number of the second conductive pieces 2 is two. The two second conductive pieces 2 are correspondingly arranged at both ends of the first conductive piece 1, and, the two second conductive pieces 2 are correspondingly connected to two adjacent single batteries 31 in the battery pack 3.

[0055] As Figure 8 shown, in one embodiment, the battery connecting piece includes a first conductive piece 1 and a second conductive piece 2, the second conductive piece 2 is connected to the single battery 31 in the battery pack 3, and the other end of the first conductive piece 1 is connected to the output terminal 32 of the battery pack 3. Among them, the battery connecting piece can connect the output terminal 32 and the single battery 31 of the battery pack 3. In this case, only one spot welding part is required. Therefore, the battery connecting piece includes a first conductive piece 1 and a second conductive piece 2, the second conductive piece 2 is connected to the single battery 31 in the battery pack 3, and the other end of the first conductive piece 1 is connected to the output terminal 32 of the battery pack 3.

[0056] When two adjacent single batteries 31 are connected in series, one second conductive piece 2 of the same battery connecting piece is connected to the positive electrode of one single battery 31, and the other second conductive piece 2 is connected to the negative electrode of the other single battery 31. Since the connection part of the first conductive piece 1 on the battery connecting piece with the second conductive piece 2 is stepped, that is, the first conductive piece 1 is higher than the second conductive piece 2, then, the first conductive piece 1 can have a gap with other materials (such as PVC) on the single battery 31, avoiding contact, and thus the safety of the battery pack 3 can be improved.

[0057] As Figure 8 shown, preferably, the battery pack 3 includes at least two battery connection pieces with different widths of the first conductive piece 1, wherein the minimum width of at least two first conductive pieces 1 is a preset width. Wherein, when the width of the first conductive piece 1 is the preset width, then in the width direction, the first conductive piece 1 may have a groove 11, and the maximum current that can flow through the battery connection piece with the groove 11 is relatively small. Then, the minimum cross-section of the first conductive piece 1 can be determined through the groove 11 design. On the premise that the thickness of the battery connection piece is determined, the minimum width can be determined, and this minimum width is the preset width, and the preset width can be 6 mm. Therefore, the width of the first conductive piece 1 is above 6 mm, and among them, the width of the first conductive piece 1 in practice is below 30 mm, that is, the width range of the first conductive piece is 6 mm to 30 mm. It can be seen that in this embodiment, the battery connection piece can be regarded as a fuse in addition to being a connection component.

[0058] This application also provides an electrical device, including the battery pack 3 as above, and this electrical device can be an electronic product powered by the battery pack 3 of this application.

[0059] The above has described the embodiments of this application. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technologies in the market, or to enable other ordinary technical personnel in the technical field to understand the embodiments disclosed herein.

Claims

1. A battery connecting piece, characterized in that, Comprising: A first conductive sheet; A second conductive sheet extending outward from at least one end of the first conductive sheet, the second conductive sheet including a spot welding area and a slot dividing the spot welding area into two, and the slot extending beyond the spot welding area; Wherein, the connecting portion of the second conductive sheet and the first conductive sheet is stepped, and the second conductive sheet and the first conductive sheet are parallel to each other.

2. The battery connection piece according to claim 1, characterized in that, The number of the second conductive sheets is two, and the two second conductive sheets are correspondingly arranged at both ends of the first conductive sheet.

3. The battery connecting piece according to claim 1, wherein The thickness range of the battery connection sheet is 0.15 mm to 0.5 mm.

4. The battery connection piece according to claim 1, wherein, At least one side of the first conductive sheet is provided with a groove.

5. The battery connection piece according to claim 4, characterized in that, The width range of the first conductive sheet is 6 mm to 30 mm.

6. The battery connection piece according to claim 1, characterized in that The slot extends inward from the free end of the second conductive sheet.

7. A battery pack, characterized in that, Comprising: At least one battery connection sheet, the battery connection sheet including the battery connection sheet according to any one of claims 1 to 6.

8. The battery pack according to claim 7, wherein, The battery connection sheet includes a first conductive sheet and two second conductive sheets, and the two second conductive sheets are correspondingly connected to two adjacent single cells in the battery pack; or, The battery connection sheet includes a first conductive sheet and a second conductive sheet, the second conductive sheet is connected to a single cell in the battery pack, and the other end of the first conductive sheet is connected to the output end of the battery pack.

9. The battery pack according to claim 7, wherein, The battery pack includes at least two battery connection sheets with different widths of the first conductive sheets, wherein the minimum width of at least two of the first conductive sheets is a preset width.

10. An electrical device, characterized in that, Comprising the battery pack according to any one of claims 7 to 9.

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