Battery sampling branch structure and battery pack

Abstract

A battery sampling branch structure and a battery pack, the battery sampling branch structure comprises a branch structure 1, the top of the branch structure 1 is a welding zone 11, the middle of one side of the welding zone 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 beneficial effects of the utility model are that: 1, after a steel sheet or a nickel sheet is pasted on 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 utility model relates to electronic technical field, concretely relates to a battery sampling branch structure and battery pack. BACKGROUND

[0002] At present, new energy vehicles develop rapidly, and power batteries are used in new energy vehicles, and the safety of the power battery is an important issue. When ensuring the safety of the battery, various parameters must be monitored, which requires the use of a special sampling circuit. When the applicant develops the sampling circuit, the flexible circuit board is used for sampling branches, thereby serving as one of the solutions. However, the applicant finds that the sampling branch in the prior art has serious deficiencies in production: 1. The ultrasonic welding area and the cantilever part of the sampling branch are easily deformed, affecting the subsequent process; 2. The strength of the ultrasonic welding with the aluminum bar is low, and glue or film reinforcement is required; 3. The ultrasonic welding with the aluminum bar has low work efficiency.

[0003] Therefore, it is urgent to develop a battery sampling branch structure with high welding strength, good stability, and low production cost. SUMMARY

[0004] The utility model aims at solving the above technical problem.

[0005] Therefore, the first purpose of the utility model is to provide a battery sampling branch structure with high welding strength, good stability, and low production cost.

[0006] The second purpose of the utility model is to provide a battery pack.

[0007] To achieve the above purpose, the utility model embodiment discloses a battery sampling branch structure, which comprises a branch structure 1, the top of the branch structure 1 is a welding area 11, the middle of one side 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; the first connecting part 112 is connected with a first welding layer 13 in layers.

[0008] In addition, the battery sampling branch structure according to the above technical solution of the application can also have the following additional technical features:

[0009] Optionally, a patch layer 14 is arranged between the first connecting part 112 and the first welding layer 13.

[0010] Optionally, the patch layer 14 is conductive glue, and the first welding layer 13 is a steel sheet or a nickel sheet.

[0011] Optionally, the patch layer 14 is a pre-plated tin layer, and the first welding layer 13 is a steel sheet or a nickel sheet.

[0012] Optionally, a middle portion of the other face of the welding area 11 is provided with a second windowing portion 113, and a second connecting portion 114 is arranged at an inner edge of the second windowing portion 113; and the second connecting portion 114 is connected with a second welding layer 14 in a laminated manner.

[0013] Optionally, the first welding layer 13 and the second welding layer 14 are nickel plating layers.

[0014] To achieve the above object, the second aspect of the utility model provides a battery pack, comprising: the battery sampling branch structure of the first aspect of the utility model.

[0015] The utility model discloses the beneficial effect lies in: 1, with the aluminum bar welding area paste steel sheet or nickel sheet, and the welding mode is changed from ultrasonic wave to laser welding, 2, the welding strength is greater than before more stable, 3, and need not point gum reinforcement, reduce the cost, 4, and laser welding work hour efficiency has the remarkable promotion compared with ultrasonic wave. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a kind of battery sampling branch structure's structure schematic diagram provided in an embodiment of the application;

[0017] Figure 2 It is a kind of battery sampling branch structure's structure schematic A-A section view provided in an embodiment of the application;

[0018] Figure 3 It is a kind of battery sampling branch structure's structure schematic A-A section view provided in another embodiment of the application.

[0019] REFERENCE SIGNS:

[0020] 1-branch structure, 11-welding area, 111-first windowing portion, 112-first connecting portion, 113-second windowing portion, 114-second connecting portion, 13-first welding layer, 14-paste layer, 15-second welding layer. DETAILED DESCRIPTION

[0021] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or parts / elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the utility model, and cannot be understood as the limitation of the utility model.

[0022] The battery sampling branch structure of the utility model embodiment is described below in combination with the drawings.

[0023] Figure 1 It is a kind of battery sampling branch structure's structure schematic diagram provided in an embodiment of the application, asFigure 1 As shown in the figure: the battery sampling branch structure, including branch structure 1, the top of the branch structure 1 is the welding area 11, the middle of one side of the welding area 11 is provided with the first window part 111, and the inner edge of the first window part 111 is provided with the first connecting part 112; the first connecting part 112 is connected with the first welding layer 13 in layers.

[0024] Figure 2 It is an embodiment of the present application to provide a kind of battery sampling branch structure A-A structure schematic cross section view, as Figure 2 As shown in the figure, the first connecting part 112 and the first welding layer 13 are provided with patch layer 14; the patch layer 14 is conductive glue; the first welding layer 13 is steel sheet or nickel sheet. Embodiment 1:

[0025] In this embodiment: the welding area of the original sampling branch is polyimide film (abbreviation PI film), PI single side window is opened in PI film, the conductor in the inside is exposed, for flexible circuit board, it is usually copper foil, then a small piece of stainless steel sheet or nickel sheet is pasted by brushing conductive glue, specifically, the steel sheet or nickel sheet of the first welding layer 13 is brushed with conductive glue to form patch layer 14, so that the welding area of the sampling branch is a module with certain rigidity, which avoids deformation.

[0026] It should be noted that the welding area of the original sampling branch needs to be welded by ultrasonic wave, and the welding area after being reinforced by steel sheet or nickel sheet can be welded by laser, so that in addition to the strength of the welding area itself being strengthened, the overall strength after welding is also significantly strengthened.

[0027] It should be noted that, Figure 2 It is a structure schematic diagram for easy understanding, Figure 1 It is a view close to the real object, according to the attached Figure 1 According to the embodiment provided, the PI film in the welding area 11 and the first connecting part 112 are both hollow frame type, and when the single side window is opened, the PI film on one side is cut to cut out the frame type PI film, and the copper foil in the internal frame type is exposed, and then the conductive glue is brushed to connect with the steel sheet or nickel sheet.

[0028] The battery sampling branch structure of the present application embodiment 1 is produced by the following steps: S100: windowing operation is carried out on one side of the welding area of the branch structure, so that the copper foil in the inside of the branch structure is exposed, and the exposed part is the first window part; S200: the first welding layer is electrically connected at the first window part, to obtain a kind of battery sampling branch structure.

[0029] According to one embodiment of the present application, between the step S100 and the step S200, there is further a step S101 of brushing conductive glue along the four edges of the first welding layer, the conductive glue layer being a patch layer, and electrically connecting the first welding layer to the first windowed part of the branch structure through the conductive glue, to obtain a battery sampling branch structure.

[0030] According to the battery sampling branch structure of the present application, after the aluminum bar is welded with the steel patch or the nickel patch, the welding mode is changed from ultrasonic welding to laser welding; the welding strength is greater and more stable than before; no glue dispensing reinforcement is needed, the cost is reduced; and the working efficiency of laser welding is significantly improved compared with ultrasonic welding.

[0031] According to one embodiment of the present application, between the first connecting part 112 and the first welding layer 13, there is a patch layer 14; the patch layer 14 is a pre-tinned layer; and the first welding layer 13 is a steel patch or a nickel patch. Embodiment 2

[0032] The cross section of the welding area of the present embodiment can also refer to Figure 2 The welding area PI film of the original sampling branch is windowed on one side, and a small nickel patch or steel patch is attached by surface mounting technology (SMT), so that the welding area of the sampling branch is a module with a certain rigidity, which avoids deformation.

[0033] Similarly to embodiment 1, the welding area after SMT patching can be welded by laser, and the strength of the welding area itself and the whole after welding is significantly improved.

[0034] The present embodiment can be manufactured by the following steps: S100 and S200 are the same as the above embodiments;

[0035] In embodiment 2, the step S101 is replaced by a step S102 of brushing pre-tinning along the four edges of the first welding layer to form a pre-tinned layer, the pre-tinned layer being a patch layer and electrically connecting the first welding layer to the first windowed part of the branch structure through conductive glue.

[0036] Figure 3 is a schematic cross-sectional view of an A-A structure of a battery sampling branch structure provided by another embodiment of the present application, as Figure 3 shown, the other side of the welding area 11 is provided with a second windowed part 113 in the middle, and the inner edge of the second windowed part 113 is provided with a second connecting part 114; and the second connecting part 114 is connected with a second welding layer 14 in layers.

[0037] According to one embodiment of the present application, the first welding layer 13 and the second welding layer 14 are nickel plating layers. Embodiment 3

[0038] In the embodiment, the original sampling branch welding area is double-sidedly windowed to expose the copper foil, and then double-sidedly plated with nickel; since the hardness of nickel is greater than that of copper, the surface rigidity of the copper foil is improved after plating with nickel, so that the surface is not easy to deform.

[0039] Similarly, plating with nickel improves the hardness, and the subsequent branch structure can be laser-welded instead of the traditional ultrasonic welding, so that the structural strength after welding is higher.

[0040] The embodiment can be specifically manufactured through the following steps: S100 and S200 are the same as those in the above embodiment.

[0041] Between the step S100 and the step S200, the method further comprises a step S103 of performing a windowing operation on the other side of the welding area of the branch structure to expose the copper foil inside the branch structure, and a second windowing part is formed at the exposed position; and the step S200 further comprises a step S201 of electrically connecting a second welding layer at the second windowing part.

[0042] Between the step S103 and the step S200, the method further comprises a step S104 of performing a nickel plating operation at the first windowing part and the second windowing part, and a nickel layer formed by the nickel plating operation is used as the first welding layer and the second welding layer; and the first connecting part is connected to the first welding layer, and the second connecting part is connected to the second welding layer.

[0043] Based on the above embodiment, the utility model further provides a battery pack.

[0044] According to the battery pack, after the aluminum bar welding area is pasted with a steel sheet or a nickel sheet, the welding mode is changed from ultrasonic welding to laser welding; the welding strength is greater and more stable than before; the battery pack does not need to be glued and reinforced, and the cost is reduced; and the laser welding work efficiency is significantly improved compared with the ultrasonic welding.

[0045] The above embodiment is a preferred implementation scheme of the utility model, and the utility model can also be implemented in other manners without departing from the concept of the utility model; any obvious replacement without departing from the concept of the utility model is within the protection scope of the utility model.

Claims

1. A battery sampling branch structure, characterized by, The utility model relates to a battery sampling branch structure, including: Branch structure (1), the top of branch structure (1) is welding area (11), the middle part of one side of welding area (11) is equipped with first window part (111), and the inner edge of first window part (111) is equipped with first connecting part (112); First connecting part (112) is connected with first welding layer (13) in laminated connection.

2. The battery sampling branch structure of claim 1, wherein: Between first connecting part (112) with first welding layer (13), be equipped with patch layer (14).

3. The battery sampling branch structure of claim 2, wherein: Patch layer (14) is conductive glue, and first welding layer (13) is steel sheet or nickel sheet.

4. The battery sampling branch structure of claim 2, wherein: Patch layer (14) is pre-plated tin layer, and first welding layer (13) is steel sheet or nickel sheet.

5. The battery sampling branch structure of claim 1, wherein: The middle part of the other side of welding area (11) is equipped with second window part (113), and the inner edge of second window part (113) is equipped with second connecting part (114); Second connecting part (114) is connected with second welding layer (15) in laminated connection.

6. The battery sampling branch structure of claim 5, wherein: First welding layer (13) and second welding layer (15) are nickel plating layer.

7. A battery pack, characterized by: The utility model relates to a battery sampling branch structure, including as any one of claims 1-6.

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