CN111864165B - A kind of preparation method of integrated integrated busbar - Google Patents

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

A kind of preparation method of integrated integrated busbar

technical field

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

Background technique

With the development of the new energy industry, the grouping technology of lithium-ion battery packs is becoming more and more important. The current battery packs are composed of a large number of single cells connected in series or in parallel to achieve rated output power, and the busbar can well realize the series and parallel connection of multiple sets of single cells.

The traditional busbar preparation method is to obtain the final busbar through complex assembly of aluminum bars and brackets and other spare parts. This busbar preparation method is not only difficult to process, but also has low overall stability, and greatly affects production. efficiency, resulting in high costs.

Contents of the invention

An embodiment of the present invention provides a method for preparing an integrated integrated busbar, which is used to solve the problems of complicated procedures and difficult assembly of conventional busbars.

An embodiment of the present invention provides a method for preparing an integrated integrated busbar, which includes punching an aluminum plate to obtain an aluminum busbar frame, the aluminum bar frame includes an aluminum bar unit and an outer frame, and the aluminum bar unit and The outer frame is connected; the aluminum bar unit of the aluminum bar frame is injected to obtain an initial bus bar; the outer frame of the aluminum bar frame is removed to obtain an integrated bus bar.

Further, the aluminum row unit includes an aluminum row body and a collection sheet, the aluminum row body is connected to the collection sheet, and the outer frame is fixedly connected to multiple groups of the aluminum row units.

Further, performing injection molding on the aluminum row unit of the aluminum row frame to obtain an initial busbar includes: fixing the aluminum row frame in an injection mold; injecting plastic into the injection mold, and Carrying out pressure keeping and cooling treatment; opening the injection mold, taking out the initial busbar; removing the nozzle and hood of the initial busbar.

Further, the initial busbar includes an injection-molded insulating plate and multiple sets of aluminum bar units, the main body of the aluminum bar is embedded in the insulating plate, and the surface of the embedding area of the insulating plate is the same as the surface of the main body of the aluminum bar. flat, the collection sheet passes through the embedding area and is bonded to the middle area of the insulating plate.

Further, a groove structure is provided in the middle area of the insulating plate, and the groove structure includes a plurality of installation grooves, and the collection sheet fits into the installation grooves.

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

Further, the installation of the signal acquisition board on the initial busbar includes: attaching the signal acquisition board to the groove structure on the initial busbar, and attaching the signal acquisition board and the acquisition sheet to each other through rivets. Fix with insulating board.

Further, a first connection hole is provided in the middle area of the insulating plate, and a second connection hole is provided at a corresponding bonding position on the collection sheet.

Further, a connector is provided on the signal collection board, and a plurality of sets of rivets pass through the connector to connect with the first connection hole and the second connection hole.

Further, the punching process of the aluminum plate includes: punching the main body of the aluminum row to form a buffer structure, the buffer structure includes a buffer hole arranged inside the edge of the main body of the aluminum row and/or arranged on the main body of the aluminum row The buffer unit in the middle of the main body of the aluminum row.

The beneficial effect of the integrated integrated busbar provided by the embodiment of the present invention is that the initial busbar is obtained by punching the aluminum plate and injecting the punched aluminum plate, so that the overall structure is stable and integrally formed, which can be extremely Greatly reduce processing costs, reduce processing procedures, assembly procedures, and reduce labor costs. In addition, by setting up a signal acquisition board, you can easily measure parameters such as temperature and voltage. The installation is convenient, the overall structure is stable, and the assembly consistency can be effectively improved. Can realize automatic assembly.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

FIG. 1 is a flowchart of a method for preparing an integrated integrated busbar provided by an embodiment of the present invention;

Fig. 2 is a flowchart of a specific embodiment of step S12 in Fig. 1;

Fig. 3 is a schematic structural view of an aluminum row frame provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an initial busbar provided by an embodiment of the present invention;

5 is a schematic structural diagram of an initial busbar and a signal acquisition board provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of an integrated busbar provided by an embodiment of the present invention;

Wherein, each reference sign in the figure:

10-aluminum row unit; 100-aluminum row main body; 101-acquisition sheet; 102-buffer hole; 103-buffer unit; 104-buffer gap; 105-second connection hole; 106-outer frame; 107-welding hole; 20 -insulation plate; 200-middle area; 201-embedding area; 202-groove structure; 203-installation groove; Acquisition board; 300-connector; 301-rivet.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may 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 indirectly connected to the other element.

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

An embodiment of the present invention provides a method for preparing an integrated integrated busbar. Referring to FIG. 1, in this embodiment, the method for preparing the integrated integrated busbar includes the following steps:

S11: punching the aluminum plate to obtain an aluminum row frame, the aluminum row frame includes an aluminum row unit and an outer frame, and the aluminum row unit is connected to the outer frame.

Specifically, select an aluminum plate with a suitable shape and size, and punch it through the punching equipment. During the punching process, not only the aluminum row unit and the outer frame are obtained, but also the details of the aluminum row unit are processed. Optionally, welding holes and a series of buffer structures are set in the aluminum row unit.

S12: Perform injection molding on the aluminum row unit of the aluminum row frame to obtain the initial busbar.

Specifically, the aluminum row units of the aluminum row frame are injected through an injection mold, so that the fixed connection of the physical structure and the electrical insulation connection between the aluminum row units are realized. Optionally, in this embodiment, thermoplastics are used for injection molding. Thermoplastics have good compression deformation resistance, environmental resistance, aging resistance, wide application temperature range, and are environmentally friendly and recyclable.

S13: Remove the outer frame of the aluminum bar frame to obtain the integrated bus bar.

As shown in FIG. 6 , specifically, the outer frame 106 is removed by punching equipment, and the insulating plates 20 obtained by injection molding are used to connect the aluminum row units 10 .

In this embodiment, an integrated integrated busbar is finally obtained by performing injection molding on the aluminum busbar frame. This preparation method greatly reduces processing and assembly procedures, reduces labor costs, and can effectively improve assembly consistency.

In a specific embodiment, referring to FIG. 3 , the aluminum row unit 10 includes an aluminum row main body 100 and a collection piece 101, the aluminum row main body 100 is connected to the collection piece 101, and the outer frame 106 is fixedly connected to multiple sets of aluminum row units 100, so that the aluminum There will be no falling apart between row units 10 .

Compared with the assembly of the aluminum bar unit 10 during the manufacturing process of the traditional busbar, this integrated structure is more convenient to process and the overall structure is more stable.

In one embodiment, as shown in Figure 2 and Figure 4, the aluminum row unit of the aluminum row frame is subjected to injection molding to obtain the initial busbar, which specifically includes the following steps:

S121: fixing the aluminum row frame in the injection mold.

Specifically, this stage is the mold closing stage, and the punched-out aluminum row frame is fixed in the injection mold for injection molding.

S122: Inject plastic into the injection mold, and perform pressure maintaining and cooling treatment.

Specifically, after the injection mold is closed, the plastic melt is filled, and after that, the pressure is maintained. The function of the pressure holding stage is to continuously apply pressure, compact the solution, and increase the density of the plastic to compensate for the shrinkage behavior of the plastic. During the pressure holding process, the plastic flow rate is extremely low, flow no longer plays a leading role, and pressure is the dominant factor affecting the pressure holding process.

Only when the molded insulating board 20 is cooled and solidified to a certain rigidity, can the insulating board 20 be prevented from being deformed by external force after demoulding. The cooling time directly affects the length of the molding cycle and the output of the insulating board 20. The temperature of the insulating board 20 should be cooled to a temperature lower than the thermal deformation temperature of the insulating board 20 to prevent the relaxation or demoulding force of the insulating board 20 due to residual stress. warping and deformation.

S123: Open the injection mold, and take out the initial busbar.

Specifically, the demoulding methods mainly include two types, ejector pin demoulding and stripping plate demoulding. In this embodiment, the ejector pin is used for demoulding, and after the initial busbar is cooled, the ejector pin is used to eject the initial busbar.

S124: Perform removal processing on the nozzle and the front of the initial busbar.

The injection-molded initial busbar may have unnecessary parts on the edge and parting surface, which will affect the use, so it needs to be removed. These useless parts include the nozzle and the cape. In the field of mechanical processing, the nozzle refers to the joint between the frame and the parts formed during the casting of the model. Cutting the nozzle can be divided into two stages. First, cut the parts from the frame from the position where some nozzles are slightly reserved, and then Then use the model to cut off the remaining nozzles on the edge of the parts neatly with a pen knife. In addition, in order to make the nozzles less obvious, you can also use sandpaper to polish them in order from coarse to fine. Criticism is an undesirable phenomenon caused by engineering processes and other reasons. It mainly refers to burrs, sharp ends, sharp angles, etc. that appear on the corners and edges of products after machining.

In this embodiment, the initial busbar is obtained by performing injection molding on the aluminum bar frame, and the aluminum bar units 10 are connected by insulating plates 20. The overall structure is stable and integrally formed, which can greatly reduce processing costs and reduce processing procedures. process, reduce labor cost, effectively improve assembly consistency, and realize automatic assembly.

In a specific embodiment, the initial busbar includes an injection-molded insulation board 20 and multiple sets of aluminum row units 10, the aluminum row body 100 is embedded in the insulation board 20, and the surface of the embedding area 201 of the insulation board 10 is in contact with the surface of the aluminum row body 100 On the other hand, the collection sheet 101 is bonded to the middle area 200 of the insulation board 10 through the embedding area 201 .

Optionally, the middle area 200 of the insulation board 10 is provided with a groove structure 202 , the groove structure 202 includes a plurality of installation grooves 203 , and the collection sheet 101 fits into the installation grooves 203 . The groove structure 202 includes two parallel protrusions 204 , and the protrusions 204 are generally higher than the bottom of the groove structure 202 and lower than the upper surface of the middle region 200 of the insulation board 20 . Each raised piece 204 is provided with a plurality of sets of openings 206 at intervals. Optionally, the width of the opening 206 is slightly larger than the width of the collection sheet 101. Two raised pieces 204 are connected by multiple sets of partitions 205, and two adjacent partitions 205 A mounting groove 203 is formed with the protruding piece 204 and an opening 206 , and the collecting sheet 101 passes through the opening 206 of the mounting groove 203 and fits with the mounting groove 203 , so that the collecting sheet 101 can be limited.

The collection piece 101 is a joint for the aluminum row unit 10 to be electrically connected to the outside. By setting the installation groove 203 in the middle area 200, it not only acts as a limiter, but also prevents the collection piece 101 from being damaged due to pulling and compression. The collection sheet 101 is a bent aluminum sheet, which is punched by punching equipment. After the collection sheet 101 protrudes from the embedding area 201, it enters the installation groove 203 through the opening 206. Since the protrusion 204 is higher than the installation groove 203 as a whole, Therefore, by designing the collection sheet 101 to have an appropriate camber and not exceeding the protruding part 204, a good cushioning effect can be achieved. There is a buffer gap 104 on the collection sheet 101, its shape and function are roughly the same as the above buffer unit 103, only the size is adjusted, which can effectively avoid pulling the voltage and temperature collection points and increase the sampling accuracy.

Optionally, the aluminum row unit 10 on the left side of the embedding area 201 and the aluminum row unit 10 on the right side of the embedding area 201 are arranged asymmetrically. 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 area 201 is four groups of conventional rectangular units with the same shape and size, and the aluminum row main body 100 on the right side is the one in the middle. Three sets of conventional rectangular units and small rectangular units located at both ends can make the positions of the collection pieces 101 staggered without affecting each other.

In a specific embodiment, after performing injection molding on the aluminum bar unit 10 of the aluminum bar frame to obtain the initial busbar, the preparation method further includes: installing the signal acquisition board 30 on the initial busbar.

As shown in Figure 5, optionally, the signal acquisition board 30 is an FPC acquisition soft board, and the width of the FPC acquisition soft board is adapted to the width of the groove structure 202 provided in the middle area 200 on the insulating board 20, wherein the FPC The acquisition point is located in the middle of the FPC acquisition soft board, which can reduce the width of the FPC and save costs. In addition, the integrated FPC, compared with the wiring harness assembly, has a simpler and more stable structure and higher safety. Optionally, a temperature collection point, a voltage collection point and a connector are also provided on the FPC collection soft board, and these components are used for collecting temperature data, voltage data and data transmission respectively.

In a specific embodiment, the signal collection board 30 is bonded to the groove structure 202 on the initial busbar, and the signal collection board 30, the collection piece 101 and the insulating board 20 are fixed by rivets 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 connection hole, and the corresponding bonding position on the collection sheet 101 is provided with a second connection hole 105 , and the positions of the two connection holes in the vertical direction are consistent.

Further, the signal collection board 30 is provided with a connector 300 , and multiple sets of rivets 301 pass through the connector 300 to connect with the first connection hole 207 and the second connection hole 105 . Compared with the traditional buckle connection and glue dispensing, connecting the insulation board 20 , the collection piece 101 and the signal collection board 30 by riveting can better improve the overall safety and stability.

Further, punching the aluminum plate includes: punching the main body 100 of the aluminum row to form a buffer structure, the buffer structure includes a buffer hole 102 arranged inside the edge of the main body 100 of the aluminum row and/or a hole arranged in the middle of the main body 100 of the aluminum row buffer unit 103.

In a specific embodiment, multiple sets of waist-shaped buffer holes 102 are provided on the inner side of the edge of the main body 100 of the aluminum row. After the impact, it is easy to cause the collision and short circuit of the aluminum parts. In addition, the buffer unit 103 in the middle of the main body 100 of the aluminum row, the buffer unit 103 is a plurality of independently distributed wave-shaped structures, the number of which can be 1 group, 3 groups, 5 groups, etc. In this embodiment, preferably, Each group of buffer units 103 includes 3 groups of wave-shaped structures. The busbar and the cell assembly not only complete the electrical connection, but also have a physical structural connection. Therefore, the buffer unit 103 can effectively protect the cell pole, reduce the pulling of the cell pole during the vibration process, and prolong the service life. life.

In a specific embodiment, the main body 100 of the aluminum row is provided with a welding hole 107, and the welding hole 107 is used for welding and packaging after the assembly of the battery cell assembly is completed. Preferably, the welding hole 107 here is a waist-shaped hole. It can be understood that in the welding process, when spot welding the welding hole 107, a small gap is left in the straight section, so that after the welding is completed, the This small gap is used to check whether the welding place meets the welding requirements, which is intuitive and clear, saving time and effort.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (8)

1. A method for preparing an integrated integrated busbar, characterized in that, comprising: punching the aluminum plate to obtain an aluminum row frame, the aluminum row frame includes an aluminum row unit and an outer frame, and the aluminum row unit is connected to the outer frame; performing injection molding on the aluminum row unit of the aluminum row frame to obtain an initial busbar; removing the outer frame of the aluminum bar frame to obtain an integrated bus bar; Wherein, the aluminum row unit includes an aluminum row main body and a collection sheet, the aluminum row main body is connected to the collection sheet, and the outer frame is fixedly connected to multiple groups of the aluminum row units; The initial busbar includes an injection-molded insulating plate and multiple sets of aluminum bar units, the main body of the aluminum bar is embedded in the insulating plate, and the surface of the embedding area of the insulating plate is flat with the surface of the main body of the aluminum bar. The collecting sheet passes through the embedding area and is bonded to the middle area of the insulating plate. 2. The method for preparing an integrated integrated busbar according to claim 1, wherein the injection molding of the aluminum bar unit of the aluminum bar frame to obtain an initial busbar comprises: Fixing the aluminum row frame in the injection mold; Injecting plastic into the injection mold, and carrying out pressure maintaining and cooling treatment; Open the injection mold and take out the initial busbar; The nozzle and the rim of the initial busbar are removed. 3. The method for preparing an integrated busbar according to claim 1, wherein a groove structure is provided in the middle area of the insulating plate, the groove structure includes a plurality of installation grooves, and the collecting sheet fit in the mounting groove. 4. The preparation method of the integrated integrated busbar according to claim 3, characterized in that, after performing injection molding on the aluminum bar unit of the aluminum bar frame to obtain the initial busbar, the preparation method further include: Install a signal acquisition board on the initial busbar. 5. The method for preparing an integrated busbar according to claim 4, wherein said installing a signal acquisition board on said initial busbar comprises: The signal collection board is attached to the groove structure on the initial busbar, and the signal collection board, collection sheet and insulation board are fixed by rivets. 6. The method for preparing an integrated integrated busbar according to claim 5, wherein a first connection hole is provided in the middle area of the insulating plate, and a second connection hole is provided at the corresponding bonding position on the collection sheet. hole. 7. The method for preparing an integrated busbar according to claim 6, wherein a connector is provided on the signal acquisition board, and multiple sets of rivets pass through the connector to connect with the first connector. The hole is connected to the second connecting hole. 8. The method for preparing an integrated integrated busbar according to claim 1, wherein the punching process on the aluminum plate comprises: punching the main body of the aluminum bar to form a buffer structure, and the buffer structure It includes a buffer hole arranged inside the edge of the main body of the aluminum row and/or a buffer unit arranged in the middle of the main body of the aluminum row.

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