Battery sampling branch structure and manufacturing method

Abstract

The invention discloses a battery sampling branch structure and a manufacturing method, the battery sampling branch structure comprises a branch structure 1, the top of the branch structure 1 is a welding area 11, the middle part of one surface of the welding area 11 is provided with a first windowing part 111, and the inner edge of the first windowing part 111 is provided with a first connecting part 112; and the first connecting part 112 is connected with a first welding layer 13 in a laminated manner. A patch layer 14 is arranged between the first connecting part 112 and the first welding layer 13; the patch layer 14 is a conductive adhesive; the first welding layer 13 is a steel sheet or a nickel sheet. The method has the beneficial effects that 1, after a steel sheet or a nickel sheet is attached to an aluminum bar welding area, the welding mode is changed from ultrasonic wave to laser welding; 2, the welding strength is higher and more stable than the previous welding strength; 3, dispensing reinforcement is not needed, so that the cost is reduced; and 4, compared with ultrasonic waves, the laser welding time efficiency is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a battery sampling branch structure and a manufacturing method thereof. Background Art

[0002] At present, new energy vehicles are developing rapidly, and power batteries are bound to be used in new energy vehicles, and the safety of power batteries is currently an important issue. When ensuring battery safety, it is necessary to monitor various parameters, which requires the use of dedicated sampling circuits. When the applicant was developing the sampling circuit, he used a flexible circuit board for the sampling branch as one of the solutions. However, the applicant found that the sampling branch in the prior art has serious deficiencies in production: 1. The ultrasonic welding area and cantilever part of the sampling branch are easily deformed, affecting the subsequent process; 2. The strength of ultrasonic welding with aluminum bar is low, and glue or lamination reinforcement is required; 3. The ultrasonic welding with aluminum bar has low labor efficiency.

[0003] Therefore, it is urgent to develop a battery sampling branch structure and manufacturing method with high welding strength, good stability and low production cost. Summary of the invention

[0004] The present invention aims to solve the above technical problems.

[0005] To this end, a first object of the present invention is to provide a battery sampling branch structure with high welding strength, good stability and low production cost.

[0006] A second object of the present invention is to provide a method for producing a battery sampling branch structure.

[0007] To achieve the above-mentioned purpose, an embodiment of the present invention discloses a battery sampling branch structure, including a branch structure 1, the top of which is a welding area 11, a first window portion 111 is provided in the middle of one side of the welding area 11, and a first connecting portion 112 is provided at the inner edge of the first window portion 111; the first connecting portion 112 is laminated and connected with a first welding layer 13.

[0008] In addition, the battery sampling branch structure according to the above technical solution of the present invention may also have the following additional technical features: Optionally, a patch layer 14 is provided between the first connection portion 112 and the first welding layer 13; the patch layer 14 is a conductive adhesive; and the first welding layer 13 is a steel sheet or a nickel sheet.

[0009] Optionally, a patch layer 14 is provided between the first connection portion 112 and the first welding layer 13; the patch layer 14 is a pre-tinned layer; and the first welding layer 13 is a steel sheet or a nickel sheet.

[0010] Optionally, a second window portion 113 is provided in the middle of the other side of the welding area 11 , and a second connecting portion 114 is provided at the inner edge of the second window portion 113 ; the second connecting portion 114 is laminated and connected with a second welding layer 14 .

[0011] Optionally, the first welding layer 13 and the second welding layer 14 are nickel-plated layers.

[0012] To achieve the above-mentioned purpose, the second aspect of the present invention proposes a method for manufacturing a battery sampling branch structure, comprising the following steps: S100: performing a window opening operation on one side of the welding area of ​​the branch structure to expose the copper foil inside the branch structure, and the exposed portion is a first window opening portion; S200: electrically connecting the first welding layer at the first window opening portion to obtain a battery sampling branch structure as described in claim 1, and obtaining a battery sampling branch structure as described in claim 1.

[0013] Optionally, between step S100 and step S200, step S101 is also included: brushing conductive glue on the four edges of the first welding layer, the conductive glue layer is a patch layer, and the first welding layer is electrically connected to the first window portion of the branch structure through the conductive glue to obtain a battery sampling branch structure as described in claim 2.

[0014] Optionally, between step S100 and step S200, step S102 is also included: pre-tinning the four edges of the first welding layer to form a pre-tinned layer, the pre-tinned layer is a patch layer, and the first welding layer is electrically connected to the first window portion of the branch structure through a conductive adhesive to obtain a battery sampling branch structure as described in claim 3.

[0015] Optionally, between step S100 and step S200, it also includes: step S103: performing a window opening operation on the other side of the welding area of ​​the branch structure to expose the copper foil inside the branch structure, and the exposed portion is a second window opening portion; step S200 also includes step S201: electrically connecting the second welding layer at the second window opening portion to obtain a battery sampling branch structure as described in claim 4.

[0016] Optionally, between step S103 and step S200, step S104 is also included: performing nickel plating operations at the first window portion and the second window portion, and the nickel layers formed by nickel plating serve as the first welding layer and the second welding layer. The first connecting portion can be regarded as connected to the first welding layer, and the second connecting portion is connected to the second welding layer, so as to obtain a battery sampling branch structure as described in claim 5.

[0017] The beneficial effects of the present invention are: 1. After the steel sheet or nickel sheet is attached to the aluminum bar welding area, the welding method is changed from ultrasonic to laser welding; 2. The welding strength is greater and more stable than before; 3. No glue reinforcement is required, which reduces costs; 4. The labor efficiency of laser welding is significantly improved compared with ultrasonic welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural schematic diagram of a battery sampling branch structure provided by an embodiment of the present invention; Figure 2 is a schematic cross-sectional view of an AA structure of a battery sampling branch structure provided by an embodiment of the present invention; Figure 3 is a schematic cross-sectional view of an AA structure of a battery sampling branch structure provided by another embodiment of the present invention; Figure 4 is a flow chart of a method for manufacturing a battery sampling branch structure provided by an embodiment of the present invention; Figure 5 is a flow chart of a method for manufacturing a battery sampling branch structure provided by another embodiment of the present invention; Figure 6 It is a flow chart of a method for manufacturing a battery sampling branch structure provided by another embodiment of the present invention.

[0019] Reference numerals: 1-branch structure, 11-welding area, 111-first window portion, 112-first connecting portion, 113-second window portion, 114-second connecting portion, 13-first welding layer, 14-patch layer, 15-second welding layer. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or components / elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The battery sampling branch structure according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0022] Figure 1 FIG. 1 is a schematic diagram of a battery sampling branch structure provided by an embodiment of the present invention. Figure 1As shown: the battery sampling branch structure includes a branch structure 1, the top of the branch structure 1 is a welding area 11, a first window portion 111 is provided in the middle of one side of the welding area 11, and a first connecting portion 112 is provided at the inner edge of the first window portion 111; the first connecting portion 112 is laminated and connected with a first welding layer 13.

[0023] Figure 2 FIG. 1 is a schematic cross-sectional view of an AA structure of a battery sampling branch structure provided by an embodiment of the present invention. Figure 2 As shown, a patch layer 14 is provided between the first connection portion 112 and the first welding layer 13; the patch layer 14 is a conductive adhesive; and the first welding layer 13 is a steel sheet or a nickel sheet. Example 1

[0024] In this embodiment: the welding area of ​​the original sampling branch is a polyimide film (PI film for short), in which a window is opened on one side to expose the internal conductor, which is usually copper foil for flexible circuit boards, and then a small piece of stainless steel sheet or nickel sheet is attached by brushing conductive glue. Specifically, conductive glue can be brushed on the steel sheet or nickel sheet of the first welding layer 13 to form a patch layer 14. In this way, the welding area of ​​the sampling branch is a module with a certain rigidity to avoid deformation.

[0025] It should be noted that the welding area of ​​the original sampling branch requires ultrasonic welding, while the welding area reinforced with steel sheets or nickel sheets in this application can be laser welded. Therefore, in addition to the strength of the welding area itself being strengthened, the overall strength after welding is also significantly enhanced.

[0026] It should also be noted that Figure 2 This is a schematic diagram for easy understanding. Figure 1 This is a view that is closer to the real object. Figure 1 In the provided embodiment, the PI film in the welding area 11 and the first connecting portion 112 are both hollow frame-shaped, and when a single-sided window is opened, the PI film on one side is cut to cut out the frame-shaped PI film to expose the internal frame-shaped copper foil, and then conductive glue is applied to connect with the steel sheet or nickel sheet.

[0027] According to the battery sampling branch structure of the present invention, after the steel sheet or nickel sheet is attached to the aluminum bar welding area, the welding method is changed from ultrasonic to laser welding; the welding strength is greater and more stable than before; and there is no need for glue reinforcement, which reduces costs; the labor efficiency of laser welding is significantly improved compared with ultrasonic welding.

[0028] According to an embodiment of the present invention, a patch layer 14 is provided between the first connection portion 112 and the first welding layer 13; the patch layer 14 is a pre-tinned layer; and the first welding layer 13 is a steel sheet or a nickel sheet. Example 2

[0029] The cross section of the welding area of ​​this embodiment can also refer to Figure 2 The PI film in the welding area of ​​the original sampling branch has a single-sided window, and a small piece of nickel sheet or steel sheet is mounted through surface mounting technology (SMT). In this way, the welding area of ​​the sampling branch is a module with a certain rigidity to avoid deformation.

[0030] Similar to Example 1, laser welding can be used for the welding area after SMT patching, and the strength of the welding area itself and the whole after welding is significantly improved.

[0031] Figure 3 FIG. 2 is a schematic cross-sectional view of an AA structure of a battery sampling branch structure provided by another embodiment of the present invention. Figure 3 As shown, a second window portion 113 is provided in the middle of the other side of the welding area 11 , and a second connecting portion 114 is provided at the inner edge of the second window portion 113 ; the second connecting portion 114 is laminated and connected with a second welding layer 14 .

[0032] According to an embodiment of the present invention, the first welding layer 13 and the second welding layer 14 are nickel-plated layers. Example 3

[0033] In this embodiment: windows are opened on both sides of the original sampling branch welding area to expose the copper foil, and then both sides are nickel-plated. Since the hardness of nickel is greater than that of copper, the surface rigidity of the copper foil is improved after nickel plating, making the surface less likely to deform.

[0034] Similarly, nickel plating increases the hardness, and subsequent branch structures can use laser welding instead of traditional ultrasonic welding, making the structure stronger after welding.

[0035] Based on the above embodiments, the embodiments of the present invention further propose a method for manufacturing a battery sampling branch structure, comprising the following steps: S100: performing a window opening operation on one side of the welding area of ​​the branch structure to expose the copper foil inside the branch structure, wherein the exposed portion is a first window opening portion; S200: electrically connecting the first welding layer at the first window opening portion to obtain a battery sampling branch structure as described in claim 1, to obtain a battery sampling branch structure as described in claim 1.

[0036] According to one embodiment of the present invention, between step S100 and step S200, step S101 is also included: brushing conductive glue on the four edges of the first welding layer, the conductive glue layer is a patch layer, and the first welding layer is electrically connected to the first window portion of the branch structure through the conductive glue to obtain a battery sampling branch structure as described in claim 2.

[0037] According to one embodiment of the present invention, between step S100 and step S200, step S102 is also included: pre-tinning the four edges of the first welding layer to form a pre-tinned layer, the pre-tinned layer is a patch layer, and the first welding layer is electrically connected to the first window portion of the branch structure through a conductive adhesive to obtain a battery sampling branch structure as described in claim 3.

[0038] According to one embodiment of the present invention, between step S100 and step S200, it also includes: step S103: performing a window opening operation on the other side of the welding area of ​​the branch structure to expose the copper foil inside the branch structure, and the exposed portion is a second window opening portion; step S200 also includes step S201: electrically connecting the second welding layer at the second window opening portion to obtain a battery sampling branch structure as described in claim 4.

[0039] According to one embodiment of the present invention, between step S103 and step S200, step S104 is further included: performing nickel plating operation at the first window portion and the second window portion, and the nickel layer formed by nickel plating serves as the first welding layer and the second welding layer, then the first connecting portion can be regarded as connected to the first welding layer, and the second connecting portion is connected to the second welding layer, so as to obtain a battery sampling branch structure as described in claim 5.

[0040] According to a manufacturing method of a battery sampling branch structure of the present invention, after a steel sheet or a nickel sheet is attached to the aluminum bar welding area, or after nickel plating, the welding method is changed from ultrasonic to laser welding; the welding strength is greater and more stable than before; and there is no need for glue reinforcement, which reduces costs; the labor efficiency of laser welding is significantly improved compared with ultrasonic welding.

[0041] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A battery sampling branch structure, characterized in that: include: A branch structure (1), wherein the top of the branch structure (1) is a welding area (11), a first window portion (111) is provided in the middle of one side of the welding area (11), a first connecting portion (112) is provided at the inner edge of the first window portion (111); and the first connecting portion (112) is laminated and connected to a first welding layer (13).

2. A battery sampling branch structure according to claim 1, characterized in that: A patch layer (14) is provided between the first connection portion (112) and the first welding layer (13); the patch layer (14) is a conductive adhesive; and the first welding layer (13) is a steel sheet or a nickel sheet.

3. A battery sampling branch structure according to claim 1, characterized in that: A patch layer (14) is provided between the first connection portion (112) and the first welding layer (13); the patch layer (14) is a pre-tinned layer; and the first welding layer (13) is a steel sheet or a nickel sheet.

4. A battery sampling branch structure according to claim 1, characterized in that: A second window portion (113) is provided in the middle of the other side of the welding area (11), and a second connecting portion (114) is provided at the inner edge of the second window portion (113); the second connecting portion (114) is laminated and connected with a second welding layer (15).

5. A battery sampling branch structure according to claim 4, characterized in that: The first welding layer (13) and the second welding layer (15) are nickel-plated layers.

6. A method for manufacturing a battery sampling branch structure, characterized in that: The following steps are involved: S100: performing a window opening operation on one side of the welding area of ​​the branch structure to expose the copper foil inside the branch structure, wherein the exposed portion is a first window opening portion; S200: electrically connecting the first welding layer at the first window portion to obtain a battery sampling branch structure as claimed in claim 1, obtaining a battery sampling branch structure as claimed in claim 1.

7. The method for manufacturing a battery sampling branch structure according to claim 6, characterized in that: Between step S100 and step S200, step S101 is also included: brushing conductive glue on the four edges of the first welding layer, the conductive glue layer is a patch layer, and the first welding layer is electrically connected to the first window portion of the branch structure through the conductive glue to obtain a battery sampling branch structure as described in claim 2.

8. The method for manufacturing a battery sampling branch structure according to claim 6, characterized in that: Between step S100 and step S200, step S102 is also included: pre-tinning the four edges of the first welding layer to form a pre-tinned layer, the pre-tinned layer is a patch layer, and the first welding layer is electrically connected to the first window portion of the branch structure through a conductive adhesive to obtain a battery sampling branch structure as described in claim 3.

9. The method for manufacturing a battery sampling branch structure according to claim 6, characterized in that: Between step S100 and step S200, the following steps are also included: Step S103: performing a window opening operation on the other side of the welding area of ​​the branch structure to expose the copper foil inside the branch structure, and the exposed part is a second window opening part; Step S200 also includes step S201: electrically connecting the second welding layer at the second window portion to obtain a battery sampling branch structure as claimed in claim 4.

10. The method for manufacturing a battery sampling branch structure according to claim 9, characterized in that: Between step S103 and step S200, step S104 is also included: nickel plating is performed at the first window portion and the second window portion, and the nickel layer formed by the nickel plating is used as the first welding layer and the second welding layer. It can be regarded that the first connecting portion is connected to the first welding layer, and the second connecting portion is connected to the second welding layer, so as to obtain a battery sampling branch structure as described in claim 5.

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