CCS connecting sheet, CCS acquisition loop and battery pack

Abstract

A CCS connecting sheet, a CCS acquisition loop and a battery pack are provided. The CCS connecting sheet comprises a connecting sheet body (1), the connecting sheet body (1) comprising a first area (11) and a second area (12), and the thickness of the second area (12) is smaller than that of the first area (11), such that a step (3) is formed at the joint of the two areas; the outer surface of the second area (12) is provided with a nickel-plated layer.

Description

A CCS connector, a CCS acquisition circuit, and a battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 24, 2023, with application number 202321963410.7. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a CCS connector, a CCS acquisition circuit, and a battery pack. Background Art

[0003] In related technologies, battery module collection is usually done by soldering an FPC (Flexible Printed Circuit) to a nickel sheet and then laser welding the nickel sheet to an aluminum busbar to form a collection loop. That is, the connection method is battery cell pole-aluminum busbar-nickel sheet-FPC-connector-wiring harness-BMS (Battery Management System).

[0004] Therefore, based on the above, we can know that the acquisition circuit needs to be transferred through the nickel sheet to achieve electrical connection between the FPC and the aluminum busbar. The transfer of the nickel sheet increases the process flow, and the acquisition circuit needs to be transferred through the nickel sheet. The jumper between the FPC and the aluminum busbar requires a separate nickel sheet, which increases the material cost of the nickel sheet. SUMMARY OF THE INVENTION

[0005] The present application provides a CCS connecting piece, a CCS collection circuit and a battery pack to solve the above technical problems.

[0006] In a first aspect, the present application provides a CCS connecting piece, comprising a connecting piece body, wherein the connecting piece body comprises a first region and a second region, wherein the thickness of the second region is smaller than the thickness of the first region to form a step at the connection between the two; and a nickel plating layer is provided on the outer surface of the second region.

[0007] In a second aspect, the present application further provides a CCS acquisition loop, comprising a plurality of CCS connecting pieces and an FPC, wherein the plurality of CCS connecting pieces are arranged in parallel to form an aluminum bar, and the aluminum bar is connected to the FPC.

[0008] In a third aspect, the present application further provides a battery pack, comprising a CCS acquisition circuit and a battery module, wherein the CCS acquisition circuit and the battery module are connected. Beneficial effects

[0009] The beneficial effects of the present application are as follows: in the CCS connecting piece provided by the present application, a nickel-plated layer is provided in the second area, which can reduce material consumption and save costs, and can also simplify the welding procedure and improve the assembly efficiency between the aluminum busbar and the FPC; at the same time, the thickness of the second area of ​​the connecting piece body is less than the thickness of the first area. When the second area is connected to the FPC, the overall thickness between the second area and the FPC is effectively reduced, thereby improving space utilization; at the same time, the thickness of the second area is less than that of the first area, and there is a step between the second area and the first area. The step can facilitate the overlap of the second area and the FPC to facilitate welding.

[0010] The CCS acquisition circuit provided in the present application includes the above-mentioned CCS connecting piece, and a nickel-plated layer is provided in the second area, which can reduce material consumption and save costs, and can also simplify the welding procedure and improve the assembly efficiency between the aluminum busbar and the FPC; at the same time, the thickness of the second area of ​​the connecting piece body is less than the thickness of the first area. When the second area is connected to the FPC, the overall thickness between the second area and the FPC is effectively reduced, thereby improving space utilization; at the same time, the thickness of the second area is less than that of the first area, and a step is provided between the second area and the first area. The step can facilitate the overlap of the second area and the FPC to facilitate welding.

[0011] The battery pack provided in the present application adopts the above-mentioned CCS collection circuit, which includes a CCS connecting piece. A nickel-plated layer is provided in the second area, which can reduce material usage and save costs, and can also simplify the welding procedure and improve the assembly efficiency between the aluminum busbar and the FPC; at the same time, the thickness of the second area of ​​the connecting piece body is less than the thickness of the first area. When the second area is connected to the FPC, the overall thickness between the second area and the FPC is effectively reduced, thereby improving space utilization; at the same time, the thickness of the second area is less than that of the first area, and there is a step between the second area and the first area. The step can facilitate the overlap of the second area and the FPC to facilitate welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a front view of a CCS connecting piece provided in an embodiment of the present application;

[0013] FIG2 is a side view of a CCS connecting piece provided in an embodiment of the present application;

[0014] FIG3 is a schematic structural diagram of an aluminum busbar provided in an embodiment of the present application;

[0015] FIG4 is an enlarged schematic diagram of point C in FIG3 ;

[0016] FIG5 is a schematic structural diagram of Example 3 of the present application;

[0017] FIG6 is a schematic structural diagram of a battery pack provided in an embodiment of the present application.

[0018] Description of reference numerals:

[0019] 1. Connecting piece body; 11. First area; 111. Connecting edge; 12. Second area; 21. Body; 211. Connecting port; 212. Airtight port; 22. Connecting block; 221. Margin area; 3. Step; 4. Plastic bracket; 5. Low-voltage connector; 6. Temperature sensor; 7. Chip fuse; 8. Battery module. Modes for Carrying Out the Invention

[0020] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0021] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0023] Example 1

[0024] Referring to Figures 1 and 2, the present invention discloses a CCS connector (CCS stands for Cells Contact System, integrated busbar), comprising:

[0025] The connecting piece body 1 includes a first area 11 and a second area 12. The thickness of the second area 12 is smaller than that of the first area 11, and the second area 12 is nickel-plated. Optionally, the connecting piece body 1 can be an aluminum sheet body or a copper sheet body. In this embodiment, the connecting piece body 1 is preferably an aluminum sheet body.

[0026] In this embodiment, the thickness of the first region 11 is less than or equal to 2 mm; the thickness of the second region 12 is 0.3 mm-1.5 mm. Therefore, it can be known that the thickness of the first region 11 is 1.5 mm-2 mm.

[0027] Preferably, the first region 11 and the second region are both square in profile, more preferably, the first region 11 and the second region 12 are both rectangular in profile, the thickness of the first region 11 is 1.5 mm, and the thickness of the second region 12 is 0.5 mm; of course, the thickness of the first region 11 can also take the limit value of 2 mm, or other values ​​between 1.5 mm and 2 mm, such as 1.6 mm, 1.7 mm, 1.8 mm and 1.9 mm, etc. Similarly, the thickness of the second region 12 can also take the limit value of 0.3 mm or 1.5 mm, or other values ​​between 0.3 mm and 1.5 mm, which are not listed here one by one.

[0028] Furthermore, the first area 11 is configured with a connecting edge 111, and the second area 12 is connected to the connecting edge of the first area 11; the side where the second area 12 is connected to the connecting edge 111 is the first long side of the second area 12. Specifically, according to the above, the first area 11 has a rectangular outline, and the two long sides of the first area 11 are perpendicularly connected to the connecting edge 111; the second area 12 is configured with an edge parallel to the connecting edge 111, and the side where the second area 12 is parallel to the connecting edge 111 is the first wide side of the second area 12. Specifically, according to the above, the second area 12 has a rectangular outline, and the second area 12 is parallel to the connecting edge 111; the size range of the first long side is 6mm-7mm, and the size range of the first wide side is 5.5mm-6.5mm.

[0029] Preferably, the first long side of the second area 12 is 6.5 mm, and the first wide side is 6 mm; the first long side of the second area 12 can also take the extreme value of 6 mm or 7 mm, or other values ​​between 6 mm and 7 mm, which are not listed here one by one.

[0030] Based on the above, the size range of the first long side is between 6mm-7mm, and the size range of the first wide side is between 5.5mm-6.5mm. The second area 12 within this size range has sufficient external connection positions and can be used for welding with external components and other operations. At the same time, there will not be too much blank area after the second area 12 is welded, which avoids material waste and effectively controls costs.

[0031] Particularly, in this embodiment, the length of the side of the first region 11 parallel to the first wide side is 5-6 times that of the first wide side, and the length of the side of the first region 11 parallel to the first long side is 8-9 times that of the first long side.

[0032] Preferably, in this embodiment, the length of the side of the first region 11 parallel to the first wide side is 5 times that of the first wide side, and the length of the side of the first region 11 parallel to the first long side is 8 times that of the first long side.

[0033] In addition, the nickel plating thickness of the second region 12 is 5-15 μm. Preferably, the plating thickness in this embodiment is 7 μm. Of course, it can also be 5 μm, 9 μm, 11 μm, 13 μm or 15 μm, as well as other values ​​within this range.

[0034] Particularly, in this embodiment, the second region 12 is disposed close to one end of a side of the first region 11 .

[0035] Other feasible solutions include that the second area 12 can be a triangular outline or an arc-shaped outline, in which case the triangular outline has no wide side, and the arc-shaped outline does not distinguish between long sides and wide sides; or, the second area 12 can be a trapezoidal outline, in which case the two sides of the second area 12 of the trapezoidal outline are the long sides.

[0036] Example 2

[0037] Based on the first embodiment, referring to Figure 2, it can be seen that since the thickness of the second region 12 is less than that of the first region 11, the second region 12 is set between the thickness range of the first region 11; preferably, in the thickness direction of the first region 11, the center of the second region 12 is aligned with the center of the first region 11. It can be seen that at this time, there are steps 3 between the bottom surface of the second region 12 and the bottom surface of the first region 11, and between the top surface of the second region 12 and the top surface of the first region 11, and the step heights of the two steps 3 are equal; it can be seen that if in the thickness direction of the first region 11, the center of the second region 12 is not aligned with the center of the first region 11, the step heights of the two steps 3 on the top and bottom surfaces of the second region 12 are not equal.

[0038] Alternatively, in the thickness direction of the first region 11, the bottom surface of the second region 12 is aligned with the bottom surface of the first region 11. In this case, there is a step 3 between the top surface of the second region 12 and the top surface of the first region 11; or, in the thickness direction of the first region 11, the top surface of the second region 12 is aligned with the top surface of the first region 11. It can be seen that, in this case, there is a step 3 between the bottom surface of the second region 12 and the bottom surface of the first region 11.

[0039] When the second area 12 is connected to an external component, the external component can be overlapped on the step 3, so as to facilitate direct welding of the two. After the welding is completed, no overlapping protrusion is formed at the overlap of the external component and the second area 12, effectively avoiding collision between the welding position and the outside world. In addition, the setting of the steps with different step heights mentioned above allows the second area 12 to adaptively adjust its connection position with the first area 11 when welding with different external components, thereby improving the applicability of the CCS connecting piece.

[0040] In particular, the step heights of all steps 3 in the second region 12 are formed by punching; forming the steps 3 by the punching process indicates that the first region 11 and the second region 12 can be integrally connected, and the integrally connected first region 11 and second region 12 improve the overall stiffness of the CCS connecting plate.

[0041] Example 3

[0042] Based on the first and second embodiments, referring to FIG3 and FIG4 , a CCS acquisition circuit includes the above-mentioned CCS connecting piece and an FPC (Flexible Printed Circuit). A plurality of CCS connecting pieces are arranged in parallel to form an aluminum busbar; the aluminum busbar is connected to the FPC.

[0043] Preferably, the main body 21 is provided with a connecting port 211; the connecting block 22 is arranged in the connecting port 211, and one end of the connecting block 22 is connected to the side wall of the connecting port 211, and the other end is a free end; the connecting block 22 is arranged in the connecting port 211, which effectively hides the connecting block 22, avoids interference between the connecting block 22 and external components, and improves the compactness of the overall structure of the FPC.

[0044] The second area 12 is connected to the connecting block 22 and overlaps with the connecting block 22. Specifically, the overlapping length of the long side and the connecting block 22 is 3mm-5mm. For the convenience of description, the overlapping length is A. In this embodiment, the overlapping length is 4mm. The connecting block 22 is provided with a margin area 221. The margin area 221 is located on one side of the long side. The margin area 221 extends away from the long side by a distance of 1.5mm-3mm. For the convenience of description, this distance is B. In this embodiment, this distance is 2mm. The size range of B can ensure that the margin area 221 has sufficient area for blanking, so that the welding between the second area 12 and the connecting block 22 will not be misaligned, thereby ensuring the welding reliability between the two.

[0045] Specifically, according to the above, it can be seen that the second area 12 is connected to the connecting block 22, that is, the second area 12 is overlapped on the outer edge of the connecting block 22 (refer to the second embodiment, in this case, the connecting block 22 is overlapped in the first step 3, and the connecting block 22 and the second area 12 are welded); referring to Figure 4, the right end of the connecting block 2 is connected to the right side wall of the connecting opening 211, and the left long side of the second area 12 is at a distance B from the left side of the connecting block 2. On this basis, in order to make the connecting block 22 more flexible, an air avoidance 212 is provided on the connecting block 22. The air avoidance 212 is a U-shaped opening provided on the outer edge of the connecting block 22; the air avoidance 212 is located on the right side of the second area 12 (that is, the second area 12 is located between the air avoidance 212 and the free end). Of course, the distance from the right long side of the second area 12 to the left side wall of the air avoidance 212 is also B. From the above, it can be seen that the area on both sides of the two long sides of the connecting block 22 with a distance B is the margin area 221.

[0046] Alternatively, referring to FIG5 , the main body 21 may not be provided with a connection port 211. In this way, one end of the connection block 22 is connected to the side of the main body 21 and extends in a direction away from the center of the main body 21 (this extended end is the free end). Preferably, the connection block 22 is a rectangular structure, and the second area 12 is connected to the end of the connection block 22 away from the main body 21 (i.e., the free end). At this time, the distance between the two long sides of the second area 12 and the side of the nearest connection block 22 is B. It should be noted that the overlapping length of the long side and the connection block 22 is still A.

[0047] Furthermore, the CCS acquisition circuit also includes a plastic bracket 4, a low-voltage connector 5, a temperature sensor 6 and a chip fuse 7; the FPC and the aluminum bus are both arranged on the plastic bracket 4, and the low-voltage connector 5, the temperature sensor 6 and the chip fuse 7 are respectively arranged on the FPC. The connection of the above components is all existing technology and will not be repeated here.

[0048] A battery pack, see Figure 6, includes a CCS collection circuit and a battery module 8; the connection between the CCS collection circuit and the battery module 8 (the aluminum busbar of the CCS collection circuit is connected to the pole of the battery module 8) is prior art and will not be repeated here.

[0049] The battery pack also includes a shell, and the CCS collection circuit and the battery module are arranged in the shell.

[0050] It should be noted that the battery module 8 will expand during use, and the FPC body 21 will be deformed by collision and compression. The above-mentioned connection block 22 is set to prevent the second area 12 and the FPC connection position from being affected by the expansion force and prevent the connection between the two from being disconnected.

Claims

1. A CCS connecting piece, comprising: Connecting piece body (1); The connecting piece body (1) comprises a first region (11) and a second region (12), the thickness of the second region (12) being smaller than the thickness of the first region (11) so as to form a step (3) at the connection between the two regions; and a nickel-plated layer is provided on the outer surface of the second region (12).

2. The CCS connecting piece according to claim 1, wherein: The thickness of the first region (11) is less than or equal to 2 mm; The thickness of the second region (12) is 0.3 mm-1.5 mm.

3. The CCS connecting piece according to claim 1 or 2, wherein: The first region (11) is provided with a connecting edge (111), and the second region (12) is connected to the connecting edge of the first region (11); The side where the second region (12) is connected to the connecting side (111) is the first long side of the second region (12); The second region (12) is provided with an edge parallel to the connecting edge (111), and the edge of the second region (12) parallel to the connecting edge (111) is a first wide edge of the second region (12); The size of the first long side ranges from 6 mm to 7 mm, and the size of the first wide side ranges from 5.5 mm to 6.5 mm.

4. The CCS connecting piece according to claim 3, wherein: In the first region (11), a side of the first region (11) parallel to the first wide side is a second wide side of the first region (11), and a side of the first region (11) parallel to the first long side is a second long side of the first region (11); The size of the second long side is 8-9 times the size of the first long side, and the size of the second wide side is 5-6 times the size of the first wide side.

5. The CCS connecting piece according to claim 1, wherein: The thickness of the nickel plating layer is 5 μm-15 μm.

6. The CCS connecting piece according to claim 2 or 5, wherein: The connecting sheet body (1) is an aluminum sheet body or a copper sheet body.

7. The CCS connecting piece according to claim 1 or 2, wherein: The first region (11) and the second region (12) are integrally connected.

8. The CCS connecting piece according to claim 1 or 2, wherein: In the thickness direction of the first region (11), the step (3) is provided between the bottom surface of the second region (12) and the bottom surface of the first region (11), and between the top surface of the second region (12) and the top surface of the first region (11).

9. A CCS collection circuit, comprising a plurality of CCS connecting sheets as claimed in claim 3 and an FPC, wherein the plurality of CCS connecting sheets are arranged in parallel to form an aluminum bar, and the aluminum bar is connected to the FPC.

10. The CCS acquisition circuit according to claim 9, wherein: The FPC comprises a body (21) and a connecting block (22); One end of the connection block (22) is connected to the body (21), the second area (12) is connected to the connection block (22) and is arranged to overlap with the connection block (22), and the overlapping length of the first long side and the connection block (22) is 3 mm to 5 mm; The connection block (22) is provided with a margin area (221), the margin area (221) is located on one side of the first long side, and the margin area (221) extends in a direction away from the long side, and the extension distance is 1.5 mm-3 mm.

11. The CCS acquisition circuit according to claim 10, wherein: The body (21) is provided with a connection port (211); The connection block (22) is arranged in the connection port (211), and one end of the connection block (22) is connected to the side wall of the connection port (211), and the other end of the connection block (22) is a free end.

12. The CCS acquisition circuit according to claim 11, wherein: The second area (12) is provided with a gap avoidance opening (212); the second area (12) is connected to the connection block (22) and is located between the gap avoidance opening (212) and the free end.

13. The CCS acquisition circuit according to any one of claims 9 to 12, wherein: It also includes a plastic bracket (4), a low-voltage connector (5), a temperature sensor (6) and a chip fuse (7), wherein the FPC and the aluminum bus are both arranged on the plastic bracket (4), and the low-voltage connector (5), the temperature sensor (6) and the chip fuse (7) are respectively arranged on the FPC.

14. A battery pack, comprising the CCS collection circuit and a battery module (8) as claimed in any one of claims 9 to 13, wherein the CCS collection circuit and the battery module (8) are connected.

15. The battery pack according to claim 14, wherein: It also includes a shell, and the CCS collection circuit and the battery module (8) are arranged in the shell; The aluminum bars of the CCS collection circuit are connected to the poles of the battery module (8).

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