CN111864165B

CN111864165B - Preparation method of integrated busbar

Info

Publication number: CN111864165B
Application number: CN202010554862.4A
Authority: CN
Inventors: 肖立峰; 郑剑武
Original assignee: Shenzhen Yiweipai Technology Co ltd
Current assignee: Shenzhen Yiweipai Technology Co ltd
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2023-03-07
Anticipated expiration: 2040-06-17
Also published as: CN111864165A

Abstract

The invention provides a preparation method of an integrated busbar, which comprises the following steps: punching an aluminum plate to obtain an aluminum row frame, wherein the aluminum row frame comprises an aluminum row unit and an outer frame, and the aluminum row unit is connected with the outer frame; performing injection molding treatment on the aluminum busbar unit of the aluminum busbar frame to obtain an initial busbar; and removing the outer frame of the aluminum busbar frame to obtain an integrated busbar. The invention greatly reduces the processing cost, the processing procedures and the assembly procedures, reduces the labor cost, can effectively improve the assembly consistency and can realize automatic assembly.

Description

Preparation method of integrated busbar

Technical Field

The invention relates to the field of electrical equipment, in particular to a preparation method of an integrated busbar.

Background

With the development of new energy industry, the grouping technology of lithium ion battery packs becomes more and more important. The existing battery pack is formed by connecting a large number of single batteries in series or in parallel to achieve rated output power, and the busbar can well achieve series and parallel connection of a plurality of groups of single batteries.

The traditional busbar preparation method can obtain the final busbar by complex assembly of parts such as aluminum busbars, brackets and the like, and the busbar preparation method is difficult to process and low in overall stability, greatly influences the production efficiency and causes overhigh cost.

Disclosure of Invention

An embodiment of the invention provides a preparation method of an integrated busbar, which is used for solving the problems of complex process and difficult assembly of a conventional busbar.

The embodiment of the invention provides a preparation method of an integrated busbar, which comprises the steps of punching an aluminum plate to obtain an aluminum busbar frame, wherein the aluminum busbar frame comprises an aluminum busbar unit and an outer frame, and the aluminum busbar unit is connected with the outer frame; performing injection molding treatment on the aluminum busbar unit of the aluminum busbar frame to obtain an initial busbar; and removing the outer frame of the aluminum busbar frame to obtain the integrated busbar.

Furthermore, the aluminum row unit comprises an aluminum row main body and a collection sheet, the aluminum row main body is connected with the collection sheet, and the outer frame is fixedly connected with the aluminum row units.

Further, the injection molding treatment is performed on the aluminum busbar unit of the aluminum busbar frame to obtain an initial busbar, including: fixing the aluminum row frame in an injection mold; injecting plastic into the injection mold, and performing pressure maintaining and cooling treatment; opening the injection mold, and taking out the initial busbar; and removing the water gap and the flash of the initial busbar.

Furthermore, the initial busbar comprises an injection-molded insulating plate and a plurality of groups of aluminum busbar units, the aluminum busbar main body is embedded into the insulating plate, the surface of an embedded area of the insulating plate is level to the surface of the aluminum busbar main body, and the acquisition sheet penetrates through the embedded area and is attached to the middle area of the insulating plate.

Further, the middle area of insulation board is provided with groove structure, groove structure includes a plurality of mounting grooves, gather the piece with the mounting groove laminating.

Further, after the aluminum busbar unit of the aluminum busbar frame is subjected to injection molding to obtain an initial busbar, the preparation method further includes: and installing a signal acquisition board on the initial busbar.

Further, installing a signal acquisition board on the initial busbar includes: and (3) attaching the signal acquisition board to the groove structure on the initial busbar, and fixing the signal acquisition board, the acquisition sheet and the insulation board through rivets.

Furthermore, a first connecting hole is formed in the middle area of the insulating plate, and a second connecting hole is formed in the corresponding attaching position of the collecting piece.

Furthermore, a plug connector is arranged on the signal acquisition board, and a plurality of groups of rivets penetrate through the plug connector and the first connecting hole and the second connecting hole.

Further, the punching process of the aluminum plate comprises the following steps: and punching the aluminum row main body to form a buffer structure, wherein the buffer structure comprises buffer holes arranged on the inner side of the edge of the aluminum row main body and/or buffer units arranged in the middle of the aluminum row main body.

The embodiment of the invention provides an integrated busbar which has the beneficial effects that: through carrying out die-cut to aluminum plate after the die-cut is moulded plastics and is handled, obtains the original mother and arranges, makes overall structure stable, and integrated into one piece can greatly reduce the processing cost, reduces manufacturing procedure, the assembly process, reduces the cost of labor, in addition, through setting up the signal acquisition board, can very conveniently record temperature, voltage isoparametric, simple to operate, overall structure is firm, can effectively improve the assembly uniformity, and can realize automatic assembly.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a flowchart illustrating a method for preparing an integrated busbar according to an embodiment of the present invention;

FIG. 2 is a flowchart of one embodiment of step S12 of FIG. 1;

fig. 3 is a schematic structural diagram of an aluminum row frame according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an initial busbar according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a structure of an initial busbar and a signal acquisition board according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an integrated busbar according to an embodiment of the present invention;

wherein, in the figures, the respective reference numerals:

10-aluminum row unit; 100-an aluminum row body; 101-collecting a sheet; 102-a buffer well; 103-a buffer unit; 104-buffer gap; 105-a second connection hole; 106-outer frame; 107-welding holes; 20-an insulating plate; 200-middle zone; 201-an embedded region; 202-groove structure; 203-mounting grooves; 204-a projection; 205-a separator; 206-an opening; 207-first connection aperture; 30-a signal acquisition board; 300-plug connector; 301-rivets.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1, in the embodiment, the method for manufacturing an integrated busbar includes the following steps:

and S11, punching the aluminum plate to obtain an aluminum row frame, wherein the aluminum row frame comprises an aluminum row unit and an outer frame, and the aluminum row unit is connected with the outer frame.

Specifically, select the suitable aluminum plate of shape and size, die-cut it through blanking equipment, in blanking process, not only obtain aluminium row unit and frame, simultaneously, still carry out the processing in the detail to aluminium row unit, optionally, arranged the unit at aluminium and set up welding hole and a series of buffer structure.

And S12, performing injection molding treatment on the aluminum busbar unit of the aluminum busbar frame to obtain an initial busbar.

Specifically, the aluminum row units of the aluminum row frame are injected by an injection mold, so that the fixed connection on the physical structure and the insulation connection on electricity are realized among the aluminum row units. Alternatively, in this embodiment, the injection molded plastic is a thermoplastic. The thermoplastic plastic has good compression deformation resistance, environmental resistance and aging resistance, has wide application temperature range, is green and environment-friendly, and can be recycled.

And S13, removing the outer frame of the aluminum busbar frame to obtain the integrated busbar.

As shown in fig. 6, specifically, the outer frame 106 is removed by a punching apparatus, and the aluminum row units 10 are connected to each other by the insulating plate 20 obtained by injection molding.

In the embodiment, the integrated busbar is finally obtained by performing injection molding treatment on the aluminum busbar frame, and the preparation method greatly reduces the processing procedures and the assembling procedures, reduces the labor cost and can effectively improve the assembling consistency.

In one embodiment, referring to fig. 3, the aluminum row unit 10 includes an aluminum row main body 100 and a collection sheet 101, the aluminum row main body 100 is connected to the collection sheet 101, and an outer frame 106 is fixedly connected to a plurality of sets of the aluminum row units 100, so that the aluminum row units 10 are not separated from each other.

Compared with the traditional mother row which assembles the aluminum row unit 10 in the manufacturing process, the integrated structure is more convenient to process, and the integrated structure is more stable.

In an embodiment, as shown in fig. 2 and 4, performing injection molding on an aluminum busbar unit of an aluminum busbar frame to obtain an initial busbar specifically includes the following steps:

s121: the aluminum row frame is fixed in an injection mold.

Specifically, the stage is a mold closing stage, and the aluminum row frame obtained by blanking is fixed in an injection mold so as to carry out injection molding treatment.

S122: and injecting plastic into the injection mold, and carrying out pressure maintaining and cooling treatment.

Specifically, after the injection mold is closed, filling of a plastic melt is performed, and after that, pressure holding is performed. The pressure maintaining stage has the function of continuously applying pressure to compact the solution and increase the density of the plastic so as to compensate the shrinkage behavior of the plastic. In the pressure maintaining process, the plastic flow rate is extremely low, the flow does not play a leading role any more, and the pressure is a leading factor influencing the pressure maintaining process.

The formed insulating plate 20 is cooled and solidified to a certain rigidity, and the deformation of the insulating plate 20 due to external force can be avoided after demoulding. The cooling time directly affects the molding cycle length and the yield of the insulating plate 20, and the temperature of the insulating plate 20 should be cooled to a temperature lower than the thermal deformation temperature of the insulating plate 20 to prevent the insulating plate 20 from being warped or deformed due to the relaxation phenomenon or the mold release force caused by the residual stress.

S123: and opening the injection mold, and taking out the initial busbar.

Specifically, the demolding mode mainly includes two types, ejector pin demolding and stripper plate demolding, in this embodiment, ejector pin demolding is adopted, and after the cooling of the initial busbar is finished, the ejector pin is used for ejecting the initial busbar.

S124: and removing the water gap and the flash of the initial busbar.

The edge part, the parting surface and other positions of the initial busbar after injection molding may have excessive useless parts, which affects the use, so that the initial busbar needs to be removed. These unwanted parts include the nozzle and the flash. In the field of machining, a water gap refers to a combination part of a frame and a part formed when a model is cast, and the cutting of the water gap can be carried out in two stages, namely, the part is cut off from the frame from a position slightly keeping some water gaps, then the model is used for cutting off the residual water gaps on the edge of the part by a pencil knife, and in addition, in order to make the water gaps more unobvious, the water gaps can be ground by sand paper in a sequence from coarse to fine. The burrs are the bad phenomena caused by engineering process and the like, and mainly refer to burrs, sharp ends, acute angles and the like which appear at edges and corners of products after machining.

In this embodiment, thereby through arranging the frame to the aluminium and moulding plastics the processing and obtaining initial female arranging, each aluminium row unit 10 is connected through insulation board 20, and overall structure is stable, and integrated into one piece can greatly reduce the processing cost, reduces manufacturing procedure, and the assembly process reduces the cost of labor, effectively improves the assembly uniformity to can realize automatic assembly.

In a specific embodiment, the initial busbar includes an injection-molded insulating plate 20 and a plurality of sets of aluminum busbar units 10, the aluminum busbar body 100 is embedded in the insulating plate 20, the surface of an embedded area 201 of the insulating plate 10 is flush with the surface of the aluminum busbar body 100, and the acquisition sheet 101 passes through the embedded area 201 and is attached to a middle area 200 of the insulating plate 10.

Optionally, the middle area 200 of the insulating plate 10 is provided with a groove structure 202, the groove structure 202 includes a plurality of mounting grooves 203, and the collecting sheet 101 is attached to the mounting grooves 203. The groove structure 202 includes two parallel protruding members 204, and the protruding members 204 are integrally higher than the bottom of the groove structure 202 and lower than the upper surface of the middle region 200 of the insulating plate 20. Each protruding part 204 is provided with a plurality of groups of openings 206 at intervals, optionally, the width of the opening 206 is slightly larger than that of the acquisition sheet 101, two protruding parts 204 are connected through the plurality of groups of spacers 205, two adjacent spacers 205, the protruding parts 204 and one opening 206 form a mounting groove 203, and the acquisition sheet 101 passes through the opening 206 of the mounting groove 203 and is attached to the mounting groove 203, so that the acquisition sheet 101 can be limited.

Gather piece 101 and be the joint that aluminium row unit 10 is used for being connected with the outside electricity, through set up mounting groove 203 at middle zone 200, not only play limiting displacement, also can prevent simultaneously to gather piece 101 and receive to drag and oppress and cause the damage. The collection sheet 101 is a bent aluminum sheet and is formed by punching through punching equipment, the collection sheet 101 extends out of the embedding area 201 and enters the installation groove 203 through the opening 206, and the bulge 204 is integrally higher than the installation groove 203, so that the collection sheet 101 has a proper camber through design and does not exceed the camber of the collection sheet 204, and a good buffering effect can be achieved. The collecting sheet 101 is provided with a buffer gap 104, the shape and the function of which are approximately the same as those of the buffer unit 103, and the buffer gap is only adjusted in size, so that the pulling condition of the voltage and temperature collecting points can be effectively avoided, and the sampling precision is increased.

Alternatively, the aluminum row unit 10 on the left side of the embedding region 201 and the aluminum row unit 10 on the right side of the embedding region 201 are asymmetrically arranged. In a specific embodiment, the aluminum row unit 10 is a rectangular unit, wherein the aluminum row main body 100 on the left side of the embedding region 201 is four groups of regular rectangular units with the same shape and size, and the aluminum row main body 100 on the right side is three groups of regular rectangular units located in the middle and small rectangular units located at two ends, so that the positions of the acquisition sheets 101 are staggered and do not affect each other.

In a specific embodiment, after the aluminum busbar unit 10 of the aluminum busbar frame is subjected to injection molding to obtain an initial busbar, the preparation method further includes: and a signal acquisition board 30 is arranged on the initial busbar.

As shown in fig. 5, optionally, the signal collecting board 30 is an FPC collecting flexible board, and the width of the FPC collecting flexible board is adapted to the width of the groove structure 202 disposed in the middle area 200 on the insulating board 20, wherein the FPC collecting point is located in the middle of the FPC collecting flexible board, so that the width of the FPC can be reduced, thereby saving the cost. In addition, integration FPC compares in the pencil assembly, and simple structure is firm, and the security is higher. Optionally, the FPC flexible collecting board is further provided with a temperature collecting point, a voltage collecting point and a connector, which are respectively used for collecting temperature data, voltage data and performing data transmission.

In a specific embodiment, the signal acquisition board 30 is attached to the groove structure 202 on the initial busbar, and the signal acquisition board 30, the acquisition sheet 101 and the insulation board 20 are fixed by the rivet 301, so that the connection is convenient, and the overall structure is stable.

Further, the middle area 200 of the insulating plate 20 is provided with a first connecting hole, the corresponding attaching position on the collecting sheet 101 is provided with a second connecting hole 105, and the positions of the two connecting holes in the vertical direction are kept consistent.

Further, the signal collecting board 30 is provided with a plug connector 300, and the plurality of sets of rivets 301 pass through the plug connector 300 to be connected with the first connecting hole 207 and the second connecting hole 105. For traditional buckle connection and point are glued, connect insulation board 20, gather piece 101 and signal acquisition board 30 through the riveting mode, can improve holistic security and stability better.

Further, the aluminum plate is subjected to a punching process including: the buffering structure is formed by punching the aluminum row main body 100 and comprises buffering holes 102 arranged on the inner side of the edge of the aluminum row main body 100 and/or buffering units 103 arranged in the middle of the aluminum row main body 100.

In one embodiment, a plurality of groups of waist-shaped buffer holes 102 are formed in the inner side of the edge of the aluminum row main body 100, the buffer holes 102 are not communicated with each other and surround the inner side of the edge of the aluminum row main body 100 for a circle, so that the injection molding strength is increased, and the problem of short circuit caused by collision of aluminum parts after impact in general injection molding is avoided. Besides, the buffer units 103 in the middle of the aluminum row main body 100, the buffer units 103 are a plurality of groups of wave structures distributed independently, the number of the wave structures can be 1 group, 3 groups, 5 groups, and the like, and in this embodiment, each group of buffer units 103 preferably includes 3 groups of wave structures. Female arranging not only accomplishes the electricity with electric core subassembly and is connected, simultaneously is physical structure last connection in addition, consequently, the ability of buffer unit 103 effectively protects electric core utmost point post, reduces the condition of dragging electric core utmost point post, increase of service life at the vibration in-process.

In one embodiment, the aluminum bar body 100 is provided with soldering holes 107, and the soldering holes 107 are used for soldering and packaging after the assembly of the electrical core assembly is completed. Preferably, the welding hole 107 is a kidney-shaped hole, and understandably, in the welding process, when the welding hole 107 is subjected to spot welding, a small gap is reserved at the straight section, so that after the welding is finished, whether the welding position meets the welding requirement can be checked through the small gap, and the welding device is visual, clear, time-saving and labor-saving.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. The preparation method of the integrated busbar is characterized by comprising the following steps of:

punching the aluminum plate to obtain an aluminum row frame, wherein the aluminum row frame comprises aluminum row units and an outer frame, and the aluminum row units are connected with the outer frame;

performing injection molding treatment on the aluminum busbar unit of the aluminum busbar frame to obtain an initial busbar;

removing the outer frame of the aluminum busbar frame to obtain an integrated busbar;

the aluminum row unit comprises an aluminum row main body and acquisition pieces, the aluminum row main body is connected with the acquisition pieces, and the outer frame is fixedly connected with the multiple groups of aluminum row units;

the initial busbar comprises an injection-molded insulating plate and a plurality of groups of aluminum busbar units, the aluminum busbar main body is embedded into the insulating plate, the surface of an embedded area of the insulating plate is level to the surface of the aluminum busbar main body, and the acquisition sheet penetrates through the embedded area and is attached to the middle area of the insulating plate.

2. The method for preparing an integrated busbar according to claim 1, wherein the step of performing injection molding on the aluminum busbar unit of the aluminum busbar frame to obtain an initial busbar comprises the following steps:

fixing the aluminum row frame in an injection mold;

injecting plastic into the injection mold, and performing pressure maintaining and cooling treatment;

opening the injection mold, and taking out the initial busbar;

and removing the water gap and the flash of the initial busbar.

3. The method for preparing the integrated busbar according to claim 1, wherein a groove structure is arranged in the middle area of the insulating plate, the groove structure comprises a plurality of mounting grooves, and the collecting sheet is attached to the mounting grooves.

4. The method for preparing an integrated busbar according to claim 3, wherein after the aluminum busbar unit of the aluminum busbar frame is subjected to injection molding to obtain an initial busbar, the method further comprises:

and installing a signal acquisition board on the initial busbar.

5. The method for preparing an integrated busbar according to claim 4, wherein the step of mounting a signal acquisition board on the initial busbar comprises the following steps:

and (3) attaching the signal acquisition board to the groove structure on the initial busbar, and fixing the signal acquisition board, the acquisition sheet and the insulation board through rivets.

6. The method for preparing an integrated busbar according to claim 5, wherein a first connecting hole is formed in the middle area of the insulating plate, and a second connecting hole is formed in the corresponding attaching position of the collecting sheet.

7. The method for preparing the integrated busbar according to claim 6, wherein a plug connector is arranged on the signal acquisition board, and a plurality of groups of rivets penetrate through the plug connector to be connected with the first connecting hole and the second connecting hole.

8. The method for preparing an integrated busbar according to claim 1, wherein the step of punching the aluminum plate comprises the following steps: and punching the aluminum row main body to form a buffer structure, wherein the buffer structure comprises buffer holes arranged on the inner side of the edge of the aluminum row main body and/or buffer units arranged in the middle of the aluminum row main body.