Collector plate and battery

Abstract

The collector plate comprises a body, the body is provided with a plurality of welding areas welded with a pole group, the plurality of welding areas are spaced along the circumferential direction of the body, each welding area is provided with a welding printing group, the welding printing group comprises a plurality of welding spots which are sequentially arranged, and the welding printing group is V-shaped or arc-shaped. According to the collector plate disclosed by the utility model, the body of the collector plate is provided with the V-shaped welding printing group, the length of a welding path is increased, the welding area between the collector plate and a pole group is increased, and the connection stability is improved, so that the overcurrent capability and the reliability of a battery are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a current collecting plate and a battery. Background Art

[0002] In the related technologies, with the increasing popularity of electric bicycles and electric vehicles, the market demand for lithium-ion power batteries is also increasing, and the industry's requirements for the technical performance, stability and reliability of lithium-ion power batteries are becoming increasingly higher. Existing cylindrical lithium-ion batteries are usually connected to the electrode group and the cover plate by welding using a collector plate, so that the battery forms a current loop. The arrangement of welding points on the collector plate directly affects the battery's overcurrent capacity. The small number of welding points on the existing collector plate leads to insufficient welding area between the collector plate and the electrode group, reducing the connection stability and making it difficult to ensure the battery's overcurrent capacity and reliability. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a current collector, wherein the main body of the current collector has a V-shaped weld mark group, the length of the welding path is increased, the welding area between the current collector and the electrode group is increased, and the connection stability is improved, thereby ensuring the current capacity and reliability of the battery.

[0004] The utility model also provides a battery, which comprises the above-mentioned current collecting plate.

[0005] According to an embodiment of the utility model, the current collecting plate includes: a main body, the main body has a welding area welded to the pole group, the welding area is a plurality of areas spaced apart along the circumferential direction of the main body, each of the welding areas has a weld mark group, the weld mark group includes a plurality of weld points arranged in sequence, and the weld mark group is V-shaped or arc-shaped.

[0006] According to the current collecting disk of the embodiment of the utility model, the main body has a welding area welded to the pole group, the welding area is a plurality of areas spaced apart along the circumferential direction of the main body, each welding area has a weld mark group, the weld mark group includes a plurality of weld points arranged in sequence, and by making the weld mark group V-shaped or arc-shaped, the length of the welding path of the weld mark group can be increased, and the area of ​​the welding connection between the current collecting disk and the pole group becomes larger, thereby improving the connection stability between the current collecting disk and the pole group, and ensuring the current carrying capacity and reliability of the battery.

[0007] According to the current collecting plate of the embodiment of the utility model, the weld mark group is V-shaped and protrudes toward the central axis of the body or protrudes away from the central axis of the body.

[0008] According to the current collecting plate of the embodiment of the utility model, the number of the weld mark groups in the same welding area is one or more. When there are multiple weld mark groups, the protruding directions of the multiple weld mark groups are the same.

[0009] According to the current collecting plate of the embodiment of the utility model, the V-shaped angle of the weld mark group is α, and satisfies: 5°≤α≤180°.

[0010] According to the current collecting plate of the embodiment of the present utility model, the welding point is a protrusion protruding toward the pole group.

[0011] According to some embodiments of the utility model, the projection of the welding spot on the body is circular; and / or the maximum distance between any two points on the outer contour of the projection of the welding spot on the body is 0.05 to 2 mm; and / or two adjacent welding spots are connected to each other.

[0012] According to the current collecting plate of the embodiment of the utility model, a support rib is provided on one side of the body in the thickness direction, and the support rib is a plurality of ribs spaced apart along the circumferential direction of the body.

[0013] According to some embodiments of the present invention, the support rib is disposed between two adjacent welding areas, and the support rib is disposed between any two adjacent welding areas.

[0014] According to the current collecting plate of the embodiment of the utility model, the current collecting plate is a positive electrode current collecting plate, and a boss is provided at the center position of one side in the thickness direction of the body.

[0015] According to the battery of the embodiment of the utility model, the battery comprises: a shell, one axial end of which is open; a cover plate, which is arranged to cover the open opening of the shell; a pole group, which is arranged in the shell; and the above-mentioned current collecting plate, which is arranged between the pole group and the cover plate and connected to the pole group and the cover plate.

[0016] According to the battery of the embodiment of the utility model, one axial end of the shell is open, the cover plate is arranged at the open mouth of the shell, the pole group is arranged in the shell, and the current collecting plate is arranged between the pole group and the cover plate and connected to the pole group and the cover plate. The structure is simple, which simplifies the battery assembly process and improves the production efficiency and product qualification rate of the battery. By setting multiple welding areas on the current collecting plate, the overcurrent capacity of the battery can be guaranteed. At the same time, by setting the welding mark group of the current collecting plate to a V shape, the welding area between the current collecting plate and the pole group is effectively increased, thereby improving the connection stability between the current collecting plate and the pole group, and ensuring the overcurrent capacity and reliability of the battery.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a top view of a current collecting plate according to an embodiment of the utility model, wherein the weld mark group is V-shaped;

[0020] Figure 2 is a three-dimensional diagram of a battery according to an embodiment of the utility model, wherein the cover plate is not shown;

[0021] Figure 3 is a front view of a battery according to an embodiment of the utility model, wherein the cover plate is not shown;

[0022] Figure 4 It is a top view of a current collecting plate according to an embodiment of the utility model, wherein the welding mark group is arc-shaped.

[0023] Reference numerals:

[0024] 100. Collecting plate;

[0025] 1. body; 11. welding area; 111. welding stamp group; 1111. welding point; 12. supporting rib; 13. boss;

[0026] 200. Battery;

[0027] 2. Shell. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Reference below Figure 1-Figure 4 A current collecting plate 100 according to an embodiment of the present invention is described.

[0032] like Figure 1 As shown, the current collecting plate 100 according to the embodiment of the present utility model comprises a body 1 .

[0033] Specifically, Figure 1 and Figure 4 As shown, the body 1 has a welding area 11 welded to the pole group, and the welding areas 11 are multiple and spaced apart along the circumferential direction of the body 1. The number of welding areas 11 on the body 1 of each current collecting disk 100 is greater than or equal to 2, and the multiple welding areas 11 can be evenly arranged along the circumference of the body 1, for example, Figure 1 As shown, the body 1 has three welding areas 11 welded to the pole group, and the three welding areas 11 are arranged at 120° intervals along the circumferential direction of the body 1 of the current collecting plate 100, thereby effectively utilizing the weldable area of ​​the body 1 to a greater extent, so that the welding points 1111 can be evenly distributed on the body 1, ensuring the current flow capacity of the current collecting plate 100. Among them, each welding area 11 has a welding mark group 111, and the welding mark group 111 includes a plurality of welding points 1111 arranged in sequence, and the welding mark group 111 is V-shaped or arc-shaped, such as Figure 1In the example shown, the weld group 111 is V-shaped; Figure 4 In the example shown, the weld group 111 is arc-shaped, thereby increasing the welding path length of the weld group 111 and increasing the welding area between the current collecting plate 100 and the electrode group, thereby improving the connection stability between the current collecting plate 100 and the electrode group and ensuring the current carrying capacity and reliability of the battery 200.

[0034] According to the current collecting plate 100 of the embodiment of the utility model, the main body 1 has a welding area 11 welded to the pole group, and the welding area 11 is a plurality of welding areas 11 spaced apart along the circumferential direction of the main body 1, and each welding area 11 has a weld mark group 111, and the weld mark group 111 includes a plurality of weld points 1111 arranged in sequence. By making the weld mark group 111 V-shaped or arc-shaped, the length of the welding path of the weld mark group 111 can be increased, and the area of ​​the welding connection between the current collecting plate 100 and the pole group becomes larger, thereby improving the connection stability between the current collecting plate 100 and the pole group, and ensuring the current carrying capacity and reliability of the battery 200.

[0035] In some embodiments of the present invention, the weld mark group 111 is V-shaped and protrudes toward the central axis of the body 1 or away from the central axis of the body 1. Figure 1 As shown, the weld group 111 is V-shaped protruding toward the central axis of the body 1, thereby effectively utilizing the welding area 11 of the body 1 to a greater extent and expanding the welding area; on the other hand, the V-shaped weld group 111 can effectively increase the path length of the weld group 111, and the welding area of ​​each weld group 111 becomes larger, thereby expanding the welding area between the body 1 of the collector plate 100 and the pole group, improving the overcurrent capacity of the collector plate 100, and improving the connection stability between the collector plate 100 and the pole group, thereby ensuring the overcurrent capacity and reliability of the battery 200. In addition, in the specific implementation process, the weld group 111 can also be V-shaped protruding away from the central axis of the body 1, and this application does not make specific limitations on this.

[0036] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the welding mark group 111 of the same welding area 11 is one or more, for example, Figure 1 As shown, each welding area 11 has a plurality of welding stamp groups 111, specifically 4. Of course, the present invention is not limited thereto, and the number of welding stamp groups 111 may also be 1, 2, 3 or 5, etc. The number of welding stamp groups 111 may be adjusted according to actual needs during the specific implementation process. When there are a plurality of welding stamp groups 111, the protruding directions of the plurality of welding stamp groups 111 are the same. For example, Figure 1In the example shown, each weld print group 111 is V-shaped and protrudes toward the center of the body 1, and multiple V-shaped weld print groups 111 with the same protruding direction are evenly arranged along the radial direction of the body 1, thereby effectively utilizing the welding area 11 of the body 1 to arrange the welding points 1111 to a greater extent, expanding the welding area, thereby improving the connection stability between the current collecting plate 100 and the electrode group, and ensuring the current carrying capacity and reliability of the battery 200. On the other hand, the weld print groups 111 protrude in the same direction, which facilitates the arrangement of multiple weld print groups 111, making the use of the welding area 11 more effective, and is conducive to increasing the length of each weld print group 111, increasing the welding area between the electrode group, and thus making the connection between the current collecting plate 100 and the electrode group more stable, and improving the current carrying capacity of the battery 200.

[0037] In some embodiments of the present invention, the V-shaped angle of the weld group 111 is α, and satisfies: 5°≤α≤180°. Specifically, if the V-shaped angle α of the weld group 111 is less than 5°, the angle of the weld group 111 is too small, which is not conducive to the arrangement of the weld points 1111 in the weld group 111, and it is easy to cause the stacking of the weld points 1111, which increases the difficulty of the welding process between the main body 1 and the pole group, thereby affecting the welding effect; since the number of welding areas 11 is greater than or equal to 2, if the V-shaped angle α of the weld group 111 is greater than 180°, it is not convenient to arrange multiple welding areas 11. When the angle α of the V-shaped weld group 111 satisfies: 5°≤α≤180°, it is possible to reasonably arrange the weld points 1111 in the weld group 111, avoid the phenomenon of stacking of the weld points 1111, ensure the welding effect, and set multiple welding areas 11 on the main body 1.

[0038] In some embodiments of the present invention, the welding point 1111 is a protrusion protruding toward the electrode group. The welding point 1111 protrudes toward the electrode group so that the current collecting plate 100 body 1 and the electrode group can be effectively welded to ensure the current carrying capacity of the battery 200.

[0039] In some embodiments of the present invention, the projection of the welding point 1111 on the body 1 is circular, thereby ensuring the effectiveness of the welding point between the body 1 and the electrode group, achieving effective welding, and ensuring the reliability of the battery 200. In addition, the circular welding point 1111 has a simple structure and is easy to manufacture.

[0040] In some embodiments of the utility model, the maximum distance between any two points on the outer contour of the projection of the welding spot 1111 on the body 1 is 0.05-2 mm. Specifically, if the maximum distance between any two points on the outer contour of the projection of the welding spot 1111 on the body 1 is greater than 2 mm, the outer diameter of the welding spot 1111 is too large. When the length of the welding mark group 111 is constant, the density of the welding spots 1111 on the welding mark group 111 is reduced, and the welding area between the body 1 and the electrode group is reduced, which leads to a decrease in the overcurrent capacity of the battery 200. If the maximum distance between any two points on the outer contour of the projection of the welding spot 1111 on the body 1 is less than 0.05 mm, the outer diameter of the welding spot 1111 is too small, which is not conducive to welding processing and affects the welding stability with the electrode group. When the maximum distance between any two points on the outer contour of the projection of the welding spot 1111 on the body 1 meets 0.05-2 mm, it is convenient for welding processing and ensures the welding effect, and the welding area of ​​the welding mark group 111 can be effectively utilized to ensure the overcurrent capacity of the battery 200.

[0041] In some embodiments of the present invention, two adjacent welding points 1111 can also be connected to each other. In this way, the welding area of ​​the weld group 111 can be effectively utilized to a greater extent, and the density of the welding points 1111 on the weld group 111 can be increased under the premise of the same length of the weld group 111, thereby improving the connection stability between the current collecting plate 100 and the electrode group, and ensuring the current capacity and reliability of the battery 200.

[0042] In some embodiments of the present invention, a support rib 12 is provided on one side of the body 1 in the thickness direction, and the support rib 12 is a plurality of ribs spaced apart along the circumferential direction of the body 1. Figure 2 As shown, when the current collecting plate 100 is applied to the battery 200, the support ribs 12 are arranged on the side of the current collecting plate 100 away from the electrode group. In this way, the strength of the body 1 of the current collecting plate 100 can be enhanced, thereby ensuring the performance of the current collecting plate 100 and improving the reliability and yield rate of the battery 200. The support ribs 12 are arranged on the outer periphery of the body 1, and the edge of the support ribs 12 away from the center of the body 1 is flush with the outer edge of the body 1, thereby further increasing the structural strength of the outer edge of the body 1 of the current collecting plate 100.

[0043] In some embodiments of the present invention, the support rib 12 is disposed between two adjacent welding regions 11, and a support rib 12 is disposed between any two adjacent welding regions 11. Figure 1As shown, three support ribs 12 are evenly arranged along the outer periphery of the body 1 and are respectively arranged between two adjacent welding areas 11, so that the body 1 of the collector plate 100 can be evenly supported in the circumferential direction, the structural strength of the body 1 of the collector plate 100 is improved, and the arrangement of the welding area 11 is convenient, so that the arrangement of the welding area 11 and the support ribs 12 on the body 1 is more compact and reasonable. Of course, the utility model is not limited to this, and the position of the support ribs 12 can be adjusted according to the specific structure of the body 1 and the actual arrangement of the welding area 11, and this application does not make specific limitations on this.

[0044] In some embodiments of the present invention, the current collecting disk 100 is a positive electrode current collecting disk 100, and a boss 13 is provided at the center of one side in the thickness direction of the body 1, for example, Figure 2 As shown, when the current collecting disc 100 is applied to the battery 200, the boss 13 is arranged on the side of the current collecting disc 100 away from the electrode group. The positive electrode current collecting disc 100 is respectively welded to the cover plate and the electrode group of the battery 200, wherein the boss 13 is arranged on the side of the body 1 in the thickness direction away from the electrode group, which is convenient for the connection between the current collecting disc 100 and the cover plate, and the other side of the body 1 in the thickness direction is welded to the electrode group, thereby the current can be led to the positive electrode of the battery 200, the electrical connection between the current collecting disc 100, the cover plate and the electrode group is realized, and the overcurrent capacity of the battery 200 is ensured.

[0045] The battery 200 according to an embodiment of the present invention is described below.

[0046] The battery 200 according to the embodiment of the present utility model comprises: a housing 2, a cover plate, an electrode group and the above-mentioned current collecting plate 100.

[0047] Specifically, Figure 2 As shown, one axial end of the shell 2 is open, and the cover plate is arranged at the open mouth of the shell 2, which is convenient for assembling the electrode group and the current collecting plate 100. The electrode group is arranged in the shell 2; the current collecting plate 100 is arranged between the electrode group and the cover plate and is connected to the electrode group and the cover plate, and the structure is simple, thereby streamlining the assembly process of the battery 200, and improving the production efficiency and product qualification rate of the battery 200. Among them, the above-mentioned current collecting plate 100 has a plurality of welding areas 11 welded with the electrode group, which can effectively utilize the weldable area of ​​the body 1, ensure the current flow capacity of the current collecting plate 100, and then ensure the current flow capacity of the battery 200. On the other hand, the structure of the V-shaped weld mark group 111 of the above-mentioned current collecting plate 100 effectively increases the welding area between the current collecting plate 100 and the electrode group, thereby improving the connection stability between the current collecting plate 100 and the electrode group, and improving the current flow capacity and reliability of the battery 200.

[0048] Optionally, the battery 200 is a cylindrical battery 200 , which has good mechanical properties, mature existing technology and low cost.

[0049] According to the battery 200 of the embodiment of the utility model, one axial end of the shell 2 is open, the cover plate is arranged at the open mouth of the shell 2, the pole group is arranged in the shell 2, and the current collecting plate 100 is arranged between the pole group and the cover plate and connected to the pole group and the cover plate. The structure is simple, so that the assembly process of the battery 200 is simplified, and the production efficiency and product qualification rate of the battery 200 are improved. By setting a plurality of welding areas 11 on the current collecting plate 100, the overcurrent capacity of the battery 200 can be guaranteed. At the same time, by setting the weld mark group 111 of the current collecting plate 100 to be V-shaped, the welding area between the current collecting plate 100 and the pole group is effectively increased, thereby improving the connection stability between the current collecting plate 100 and the pole group, and ensuring the overcurrent capacity and reliability of the battery 200.

[0050] Other components of the battery 200 according to the embodiment of the present invention, such as the electrode group including the positive electrode sheet, the negative electrode sheet and the separator, are known to those skilled in the art and will not be described in detail here.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A collecting plate, characterized in that: include: A body, wherein the body has a welding area welded to the pole group, wherein the welding area is a plurality of areas spaced apart along the circumferential direction of the body, each of the welding areas has a weld mark group, wherein the weld mark group includes a plurality of weld points arranged in sequence, and the weld mark group is V-shaped or arc-shaped, The current collecting disk is a positive electrode current collecting disk, and a boss is provided at the center position of one side in the thickness direction of the body.

2. The collecting plate according to claim 1, characterized in that: The weld mark group is V-shaped and protrudes toward the central axis of the body or away from the central axis of the body.

3. The collecting plate according to claim 1 or 2, characterized in that: The number of the welding mark groups in the same welding area is one or more. When there are multiple welding mark groups, the protruding directions of the multiple welding mark groups are the same.

4. The collecting plate according to claim 1 or 2, characterized in that: The V-shaped angle of the weld stamp group is α, and satisfies: 5°≤α≤180°.

5. The collecting plate according to claim 1, characterized in that: The welding point is a protrusion protruding toward the pole group.

6. The collecting plate according to claim 5, characterized in that: The projection of the welding point on the body is circular; and / or, the maximum distance between any two points on the outer contour of the projection of the welding point on the body is 0.05 to 2 mm; And / or, two adjacent welding points are connected to each other.

7. The collecting plate according to claim 1, characterized in that: One side of the body in the thickness direction is provided with a supporting rib, and the supporting rib is a plurality of ribs spaced apart along the circumferential direction of the body.

8. The collecting plate according to claim 7, characterized in that: The support rib is arranged between two adjacent welding areas, and the support rib is arranged between any two adjacent welding areas.

9. A battery, characterized in that: include: A housing, wherein one axial end of the housing is open; A cover plate, the cover plate is arranged on the open opening of the shell; A pole group, the pole group is arranged in the shell; According to any one of claims 1 to 8, the current collecting disk is arranged between the pole group and the cover plate and is connected to the pole group and the cover plate.

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