Sampling branch circuit board

Abstract

The utility model discloses a sampling branch circuit board, which adopts a three-layer FPC (Flexible Printed Circuit) structure consisting of an upper insulating layer, a circuit layer and a lower insulating layer, and comprises an FPC sampling main body welding area and a battery busbar welding area which are positioned at two ends of the sampling branch circuit board, forming a plurality of sampling branch bonding pad groups in the FPC sampling main body welding area through a windowing process, wherein the position of each sampling branch bonding pad group corresponds to a certain branch connection bonding pad of the FPC sampling main body; each sampling branch bonding pad group comprises a tin adding area located in the middle of the front surface, tin climbing areas located on the two sides of the front surface, and a welding area located on the back surface; the welding area extends to the edges of the two sides, and at least one tin coating hole penetrating to the welding area is formed in the tin adding area; and each tin climbing area is provided with a semicircular hole penetrating to the welding area at the edge of the FPC sampling main body welding area. According to the utility model, the welding quality can be conveniently confirmed through the tin climbing state, the occurrence of pseudo soldering can be greatly reduced, and the safety risk is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy FFC sampling line manufacturing, in particular to a sampling branch circuit board. Background Art

[0002] In new energy FFC sampling lines, when the sampling branch is soldered to the FFC sampling body, due to the characteristics of the welding process, the problem of cold solder joints may occur. In addition, the branch is soldered at the bottom, and the welding quality is difficult to confirm from the appearance, which poses a high safety risk. Therefore, the utility model proposes a product that can confirm the welding quality by the solder creep state. Utility Model Content

[0003] The utility model aims to provide a sampling branch circuit board, which can conveniently and effectively confirm the welding quality when the sampling branch circuit board is welded to the FFC sampling body.

[0004] The specific technical solutions are:

[0005] A sampling branch circuit board adopts a three-layer FPC structure consisting of an upper insulating layer, a circuit layer and a lower insulating layer, including an FPC sampling body welding area and a battery busbar welding area located at both ends of the sampling branch circuit board; a plurality of sampling branch pad groups are formed in the FPC sampling body welding area through a window opening process, and the position of each sampling branch pad group corresponds to a branch connection pad of the FPC sampling body; each group of the sampling branch pad groups includes a tin adding area located in the middle of the front of the sampling branch circuit board and tin creeping areas on both sides of the front, and a welding area located on the back of the sampling branch circuit board; the welding area extends to the two side edges of the FPC sampling body welding area, and the tin adding area is provided with at least one tin-plating hole that penetrates the welding area; each of the tin creeping areas is provided with a semicircular hole that penetrates the welding area at the edge of the FPC sampling body welding area.

[0006] Furthermore, the sampling branch pad group is distributed in parallel in the FPC sampling main body welding area; in the sampling branch pad group, the widths of the tin adding area, the tin creeping area and the welding area are equal.

[0007] Furthermore, the widths of the sampling branch pad groups are equal, and the center distances between adjacent sampling branch pad groups are equal.

[0008] Furthermore, the length of the welding zone is 3 mm to 15 mm, and the width is 0.5 mm to 1.5 mm; the center distance between adjacent welding zones is 1 mm to 2 mm.

[0009] Furthermore, the distance between the tin creeping area and the tin adding area is not less than 0.3 mm.

[0010] Furthermore, the sampling branch circuit board also includes a fool-proof positioning area in the middle, and the fool-proof positioning area is arranged adjacent to the battery busbar welding area, and is used for welding alignment of the sampling branch circuit board and the battery pack busbar.

[0011] Furthermore, the fool-proof positioning structure of the fool-proof positioning area is a positioning hole.

[0012] Furthermore, the length of the welding area is 3mm to 15mm; the width is 0.5mm to 1.5mm; the center distance between adjacent welding areas is 1mm to 2mm; and the distance between the tin creeping area and the tin adding area is not less than 0.3mm.

[0013] Furthermore, the sampling branch circuit board also includes an S-shaped structural buffer in the middle for flexibly connecting the FPC sampling body welding area and the battery busbar welding area; in the S-shaped structural buffer, gaps are provided between the two side edges of its circuit layer and the two side edges of the upper insulating layer and the lower insulating layer; micro-connection points are provided at both turning areas of the S-shaped structural buffer, and there is no circuit layer at the micro-connection points. The S-shaped structural buffer forms a two-point connection with the FPC sampling body welding area and the battery busbar welding area through its end points and the micro-connection points; when the micro-connection point is disconnected, the sampling branch circuit board adapts to the distance change between the FPC sampling body welding area and the battery busbar welding area through the stretching of the S-shaped structural buffer.

[0014] Furthermore, a fuse is provided in the circuit layer between the two turning areas of the S-shaped structure buffer zone.

[0015] Furthermore, the blown fuse adopts a serpentine structure.

[0016] Furthermore, the line width of the fusible fuse is 0.05 mm to 0.2 mm.

[0017] Furthermore, the sampling branch circuit board also includes a fool-proof positioning area in the middle, and the fool-proof positioning area is arranged adjacent to the battery busbar welding area, and is provided with a fool-proof positioning structure for welding and aligning the sampling branch circuit board and the battery pack busbar.

[0018] Furthermore, the fool-proof positioning structure is a positioning hole.

[0019] Furthermore, the battery busbar welding area is a double-sided pad or a single-sided pad, and the single-sided pad is formed by removing the lower insulating layer of the battery busbar welding area.

[0020] By adopting the sampling branch circuit board of the utility model, the welding quality can be conveniently confirmed through the tin creeping state, which can greatly reduce the occurrence of cold solder joints and greatly reduce the safety risks caused by cold solder joints when the energy storage battery is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a side view of the flexible circuit board structure schematic diagram of the sampling branch circuit board of the present invention;

[0022] Figure 2 This is a schematic diagram of the circuit layer structure of the sampling branch circuit board of the present utility model;

[0023] Figure 3 This is a front view of the sampling branch circuit board of the present invention;

[0024] Figure 4 This is a back view of the sampling branch circuit board of the present invention;

[0025] Figure 5 It is a structural diagram of the FPC sampling body;

[0026] Figure 6 It is a schematic diagram of welding of the sampling branch circuit board and the FPC sampling body of the utility model. DETAILED DESCRIPTION

[0027] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0028] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0029] like Figures 1 to 4 As shown, the present invention provides a sampling branch circuit board 100. The sampling branch circuit board 100 adopts a three-layer structure, including a circuit layer 2, and an upper insulating layer 1 and a lower insulating layer 3 respectively attached to the front and back of the circuit layer 2.

[0030] This sampling branch circuit board 100 is a universal sampling branch circuit board. For each battery pack, an FPC sampling body 200 and multiple identical sampling branch circuit boards 100 are welded together to conduct the connection between each sampling branch circuit board 100 and each sampling line on the FPC sampling body 200, so as to obtain the battery pack busbar voltage and upload it.

[0031] In this embodiment, the sampling branch circuit board 100 is functionally divided, including the FPC sampling body soldering area 110 and the battery busbar soldering area 140 at either end, and an S-shaped buffer zone 120 and foolproof positioning area 130 in the center. Circuit layer 2 is a copper foil layer, formed through etching and other processes to form an irregularly shaped electrode sheet that extends from the FPC sampling body soldering area to the battery busbar soldering area 140.

[0032] 1. FFC sampling body welding area 110

[0033] The FPC sampling body soldering area 110 is provided with multiple groups of sampling branch pads 110a, ..., 110n. Each sampling branch pad group 110a, ..., 110n includes a tinning area 111 located in the center of the front of the sampling branch circuit board 100, tin creeping areas 112 and 113 on both sides of the front, and a soldering area 114 located on the back of the sampling branch circuit board 100. The soldering area 114 extends to both sides of the FPC sampling body soldering area 110. The tinning area 111 is provided with at least one tinning hole 115 that extends through the soldering area. Each tin creeping area 112 and 113 is provided with a semicircular hole 116 and 117 that extends through the soldering area at the edge of the FPC sampling body soldering area.

[0034] Preferably, each sampling branch pad group is distributed in parallel in the FPC sampling body welding area 110, and each sampling branch pad group has equal structural dimensions in all aspects. For each sampling branch pad group 110a, ..., 110n, the width of the tin adding area 111, the tin climbing area 112, 113 and the welding area 114 is equal, and the width is 0.5mm to 1.5mm. The length of each group of pads is 3mm to 15mm, and the center spacing of adjacent sampling branch pad groups is 1mm to 2mm and is consistent with the center spacing of the sampling lines of the FFC sampling body. One or more tin-plating holes are provided on the pad, and the tin-plating holes are preferably circular or elliptical, with a diameter slightly smaller than the width of the welding area 114.

[0035] 2. S-shaped structure buffer 120

[0036] To meet the installation accuracy requirements, an S-shaped buffer 120 is provided. When the battery cell expands and stretches the sampling branch circuit board 100, the S-shaped structure expands and stretches with the battery cell, forming a buffer to prevent the product from being broken by the force.

[0037] In the S-shaped buffer zone 120 , a certain gap is provided between the two side edges of the circuit layer and the two side edges of the upper insulating layer and the lower insulating layer.

[0038] Micro-connection points 121 and 122 are located at the two corners of the S-shaped buffer 120. No circuit layers are located at these points. The S-shaped buffer 120 forms a two-point connection with both ends through its two end points and micro-connection points 121 and 122. When the battery cell expands and stretches the sampling branch circuit board 100, the micro-connection points automatically disconnect under stress, allowing the S-shaped structure to expand and stretch with the cell, forming a buffer zone and preventing circuit breakage caused by stress.

[0039] A fuse 123 is formed by etching between the two corners of the S-shaped buffer 120. The fuse 123 has a line width of 0.05 to 0.2 mm, depending on the current, and can be straight or serpentine. When a high current flows during an abnormal short circuit, the fuse can quickly blow, preventing thermal runaway.

[0040] 3. Anti-fool positioning area 130

[0041] The foolproof positioning area 130 is arranged on a side close to the battery busbar welding area 140 .

[0042] A positioning hole 131 is provided in this area for positioning and foolproofing the sampling branch circuit board 100 , and the diameter of the positioning hole is 1 to 2.5 mm.

[0043] 4. Battery busbar welding area 140

[0044] The sampling branch circuit board 100 is welded to the battery pack busbar 300 via the battery busbar welding area 140. This area is preferably a double-sided pad for easy soldering. If the copper thickness is thin, a single-sided pad (i.e., only the lower insulation layer is removed) is also acceptable. The pad length and width are preferably 5mm to 10mm.

[0045] like Figure 5 As shown, the exemplary FPC sampling body 200 is provided with a plurality of sampling lines 201, 202, ... in parallel, and each sampling line 201, 202, ... has a window at a different position of the FPC sampling body 200 to form branch connection pads 201a, 202a, ... of each sampling line.

[0046] like Figure 6As shown, during soldering, the sampling branch circuit board 100 can be aligned with the branch connection pad 202a of the FPC sampling body 200 through the sampling branch pad group 110b thereon, and then soldered to each other by adding tin from the front tinning area 111. During soldering, the tin in the front tinning area 111 can overflow to the soldering area 114 on the back through the tinning holes 115, thereby soldering the sampling branch circuit board 100 to a sampling circuit in the FPC sampling body 200. When the tin overflows from the bottom and overflows to the tin creeping areas 112 and 113, it means that the tin has been evenly distributed between the soldering area 114 on the back and the branch connection pad 201a of a sampling circuit in the FPC sampling body 200. By visually inspecting the tin creeping status, the soldering effect can be well confirmed to ensure the reliability of the product soldering.

[0047] By analogy, the welding connection between all the sampling branch circuit boards 100 and the FPC sampling main body 200 is completed.

[0048] In summary, by adopting the sampling branch circuit board of the present invention, the welding quality of the sampling branch circuit board and the FPC sampling body can be quickly confirmed by visual inspection, which can greatly reduce circuit abnormalities caused by poor wiring harness welding quality and ensure the safety of batteries and electrical equipment.

[0049] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. A sampling branch circuit board, characterized in that: A three-layer FPC structure consisting of an upper insulating layer, a circuit layer and a lower insulating layer is adopted, including an FPC sampling body welding area and a battery busbar welding area located at both ends of the sampling branch circuit board; a plurality of sampling branch pad groups are formed in the FPC sampling body welding area through a window opening process, and the position of each sampling branch pad group corresponds to a branch connection pad of the FPC sampling body; each group of the sampling branch pad groups includes a tin adding area located in the middle of the front of the sampling branch circuit board and tin creeping areas on both sides of the front, and a welding area located on the back of the sampling branch circuit board; the welding area extends to the two side edges of the FPC sampling body welding area, and the tin adding area is provided with at least one tin-plating hole that penetrates the welding area; each of the tin creeping areas is provided with a semicircular hole that penetrates the welding area at the edge of the FPC sampling body welding area.

2. The sampling branch circuit board according to claim 1, characterized in that: The sampling branch pad group is distributed in parallel in the FPC sampling main body welding area; in the sampling branch pad group, the widths of the tin adding area, the tin creeping area and the welding area are equal.

3. The sampling branch circuit board according to claim 2, wherein: The widths of the sampling branch pad groups are equal, and the center distances between adjacent sampling branch pad groups are equal.

4. The sampling branch circuit board according to claim 3, wherein: The length of the welding area is 3mm to 15mm; the width is 0.5mm to 1.5mm; the center distance between adjacent welding areas is 1mm to 2mm; the distance between the tin creeping area and the tin adding area is not less than 0.3mm.

5. The sampling branch circuit board according to claim 1, wherein: The sampling branch circuit board also includes an S-shaped structural buffer in the middle for flexibly connecting the FPC sampling body welding area and the battery busbar welding area; in the S-shaped structural buffer, gaps are provided between the two side edges of its circuit layer and the two side edges of the upper insulating layer and the lower insulating layer; micro-connection points are provided at both turning areas of the S-shaped structural buffer, and there is no circuit layer at the micro-connection points. The S-shaped structural buffer forms a two-point connection with the FPC sampling body welding area and the battery busbar welding area through its end points and the micro-connection points; when the micro-connection point is disconnected, the sampling branch circuit board adapts to the distance change between the FPC sampling body welding area and the battery busbar welding area through the stretching of the S-shaped structural buffer.

6. The sampling branch circuit board according to claim 5, characterized in that: A fuse is provided on the circuit layer between the two turning areas of the S-shaped structure buffer zone.

7. The sampling branch circuit board according to claim 6, characterized in that: The fusible fuse adopts a serpentine structure.

8. The sampling branch circuit board according to claim 1, wherein: The sampling branch circuit board also includes a fool-proof positioning area in the middle. The fool-proof positioning area is arranged adjacent to the battery busbar welding area and is provided with a fool-proof positioning structure for welding and aligning the sampling branch circuit board and the battery pack busbar.

9. The sampling branch circuit board according to claim 8, characterized in that: The foolproof positioning structure is a positioning hole.

10. The sampling branch circuit board according to claim 1, wherein: The battery busbar welding area is a double-sided pad or a single-sided pad, and the single-sided pad is formed by removing the lower insulating layer of the battery busbar welding area.

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