KR20180043665A - Battery cover, mold and method manufacturing the battery cover by the mold - Google Patents

Abstract

A method for manufacturing a battery cover is provided. In the method for manufacturing the battery cover, injection liquid is injected into an injection port formed in an upper mold of a mold. Air in a cavity is sucked through a suction hole formed in at least one of the upper mold and a lower mold of the mold so that the injection liquid is filled in the cavity in the mold. The filled injection liquid is hardened. A hardened product having the hardened injection liquid is cut along a cutting line which divides the product into the battery cover and a cut portion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery cover, a battery cover,

The present invention relates to a method of producing a battery cover through a battery cover, a mold and a mold.

As is well known, an electric vehicle (EV) is an automobile that uses an electric power of a battery to drive an AC or DC motor to generate power, and a battery that is indispensable to such an electric vehicle is a battery. Generally, a battery used in an electric vehicle is modularized. The battery is provided with a positive electrode plate, a negative electrode plate and a separator inside the cell case and a battery filled with an electrolyte. The battery is charged to the rated capacity by the generator, The electrochemical action to be discharged is repeated. As such, since the battery is a key device in an electric vehicle, it is sealed with a cover to maintain watertightness in order to protect it from an external impact. A battery cover may also be used for the purpose of avoiding cell-to-cell contact and stacking cells. The manufacture of such a battery cover is made of a plastic material and is also manufactured through a molding die. Therefore, there is a point that it is difficult for the plastic injection liquid to spread evenly into the space inside the mold in order to fabricate a relatively thin battery cover.

Korean Patent Publication No. 10-2014-0048372 (Apr. 24, 2014)

It is an object of the present invention to provide a thin battery cover which is applied to a battery module for an electric vehicle through a thin film injection process which is performed through a mold for molding plastic or synthetic resin injection liquid.

It is another object of the present invention to provide a battery cover capable of reducing the volume and weight of a battery module for an electric vehicle by reducing the weight of a battery cover coupled with battery cells included in a battery module of an electric vehicle do.

Another object of the present invention is to provide a thin battery cover which is manufactured by a mold for reducing the space between the upper mold and the lower mold so that the plastic or synthetic resin injection liquid is uniformly filled in the space between the upper mold and the lower mold of the mold do.

It is another object of the present invention to provide a battery cover which is formed by a die capable of forming a pair of battery covers so that the mold is symmetrical around the injection port.

Another object of the present invention is to provide a mold for reducing the space between the upper mold and the lower mold so that the plastic or synthetic resin injection liquid is uniformly filled in the space between the upper mold and the lower mold of the mold.

It is another object of the present invention to provide a mold for forming a pair of battery covers by forming the mold to be symmetrical around the injection port.

It is another object of the present invention to provide a method for reducing the space between a top mold and a bottom mold such that a plastic or synthetic resin injection liquid is uniformly filled in a space between a top mold and a bottom mold of a mold.

It is another object of the present invention to provide a method of manufacturing a pair of battery covers by forming a mold so as to be symmetrical around an injection port.

The injection liquid is injected into the injection port formed in the upper mold of the mold and the air in the cavity is sucked through the suction hole formed in at least one of the upper mold and the lower mold so that the injection liquid is filled in the cavity in the mold. A cured product in which the filled injection liquid is cured, and a cured product in which the injection liquid has been cured is cut along the cutting line that is divided into the battery cover and the cut portion, and is separated.

Then, after being cut along the cutting line separated by the cut portion, at least one adhesive film can be adhered to the surface of the battery cover.

In addition, a plurality of through holes may be formed in the adhesive film so that air can be discharged without being interposed on a surface to which the adhesive is adhered in the process of adhesion by surface contact with the battery cover.

In addition, the filling order of the injection liquid may be filled sequentially with the injection port, the cut-out portion and the battery cover portion.

Further, when the injection liquid is filled from the cut portion to the battery cover side, the injection liquid can be guided so that the injection liquid can be filled in two or more directions by the injection liquid guide portion.

An upper mold on which an injection port through which injection liquid is injected is formed; At least one suction hole is formed in at least one of the upper mold and the lower mold, and at least one suction hole is formed in at least one of the upper mold and the lower mold, and the lower mold includes an injection liquid guide portion positioned to correspond to the upper mold and guiding the injection liquid passing through the injection hole to be supplied in a plurality of directions And a mold is provided for moving the injection liquid toward the suction hole by suction through the suction hole to fill a cavity between the upper mold and the lower mold.

Then, the injection port is located at the center of the upper mold, and the injection liquid can be moved so as to be symmetrical on both sides in the cavity with respect to the position of the injection port.

The injection liquid guide portion may include a plurality of first injection liquid guide portions and at least one second injection liquid guide portion protruding from the first injection liquid guide portions to be spaced apart from each other.

Further, the pressure sucked by the suction means may be subjected to a differential pressure from the time when the injection liquid is injected into the injection port until the injection liquid is filled in the cavity.

The injection liquid is injected into the injection port formed in the upper mold of the mold and the air in the cavity is sucked through the suction hole formed in at least one of the upper mold and the lower mold so that the injection liquid is filled in the cavity in the mold. Wherein the filling liquid is cured and the injection liquid is cut and separated along a cutting line separating the battery cover and the cut portion from the cured cured product. do.

An upper mold on which an injection port through which injection liquid is injected is formed; At least one suction hole is formed in at least one of the upper mold and the lower mold, and at least one suction hole is formed in at least one of the upper mold and the lower mold, and the lower mold includes an injection liquid guide portion positioned to correspond to the upper mold and guiding the injection liquid passing through the injection hole to be supplied in a plurality of directions And the mold is made by a mold in which the injection liquid is moved toward the suction hole by suction through the suction hole to fill a cavity between the upper mold and the lower mold.

An embodiment of the present invention can provide a thin battery cover to be applied to a battery module for an electric vehicle through a thin film injection process that is manufactured through a mold for molding plastic or synthetic resin injection liquid.

One embodiment of the present invention can provide a battery cover capable of reducing the volume and weight of the battery module for an electric vehicle by reducing the weight of the battery cover coupled with the battery cell included in the battery module of the electric vehicle.

According to another aspect of the present invention, there is provided a thin battery cover which is manufactured by a mold for reducing the space between the upper and lower molds so that the plastic or synthetic resin injection liquid is uniformly filled in the spaces between the upper and lower molds.

According to another aspect of the present invention, there is provided a battery cover, which is formed by a die capable of forming a pair of battery covers, the mold being formed to be symmetrical with respect to an injection port.

According to another aspect of the present invention, there is provided a mold for reducing a space between a top mold and a bottom mold such that a plastic or synthetic resin injection liquid is uniformly filled in a space between a top mold and a bottom mold of the mold.

According to another aspect of the present invention, there is provided a mold for manufacturing a pair of battery covers, the mold being formed to be symmetrical about an injection port.

According to another aspect of the present invention, there is provided a method of reducing a space between a top mold and a bottom mold such that a plastic or synthetic resin injection liquid is uniformly filled in a space between a top mold and a bottom mold of the mold.

In addition, an embodiment of the present invention can provide a method of manufacturing a pair of battery covers by forming the mold to be symmetrical around the injection port.

1 is a perspective view of a battery cover in an injection liquid state according to an embodiment of the present invention.
FIG. 2 (a) is a side view of a battery cover according to an embodiment of the present invention, and FIG. 2 (b) is a perspective view of a battery cover according to an embodiment of the present invention.
FIG. 3 (a) is an exploded perspective view of a battery cover including an adhesive film according to an embodiment of the present invention, FIG. 3 (b) is a partial enlarged view of a battery cover with an adhesive film according to an embodiment of the present invention
4 is a perspective view of a mold according to an embodiment of the present invention.
5 is a cross-sectional view of a mold according to an embodiment of the present invention.
6 is a flowchart illustrating a method of manufacturing a battery cover according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is merely an example and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical idea of the present invention is determined by the claims, and the following embodiments are merely a means for effectively explaining the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs.

The battery cover of the present invention may be a battery cover that is cured through injection liquid of at least one of plastic and synthetic resin, and a method of pressing the mold may be variously modified by those skilled in the art. Therefore, the pressing method of the mold will be described below without limiting.

In addition, a method of manufacturing a battery cover to be described later can be manufactured through thin-film injection molding. Here, thin film injection molding means injection molding in which a thin film section is formed in an injection product after molding, and generally means that a section having a thickness of 1 mm or less is formed, but the thickness of the battery cover to be described below is not limited thereto . The inner space of the mold may be narrowly formed for thin film injection molding. In this narrow environment, a suction device may be provided for sucking in the moving direction so that the injection liquid can be moved. 5, and the like. In the present invention, the region corresponding to the bent portion of the battery cover can be regarded as a section in which thin-film injection molding is performed.

In the battery cover of the above-described thin film battery, a plurality of battery cells are coupled to each other through the contact with the outer surface of the battery cell in an electric vehicle constituting the battery pack, so that the battery cover can be included in the electric vehicle more than the battery cell number. With this configuration, the size of the battery module included in the electric vehicle due to the battery cover can be increased, and the weight can also be increased. Therefore, an economically positive effect can be expected from the viewpoint of power use and installation space by the battery cover to be described below.

1 is a perspective view of a battery cover in an injection liquid state according to an embodiment of the present invention. Here, the battery cover in the injection liquid state means the cover injection liquid 1 and specifies that it is a member different from the battery cover 100. Therefore, the cover injection liquid 1 is in an uncured liquid injection liquid state, and the battery cover 100 may mean a member that has been partially cut for use with the battery cover 100 after being cured. However, in the following description, the liquid and the injection liquid are cured, and then, the state of the liquid and the injection liquid are separately classified.

Referring to FIG. 1, the cover injection liquid 1 may include a battery cover 100 and a cut-out portion 10. Here, the battery covers 100 and 100 'may be positioned between the batteries to prevent direct contact between the batteries in a structure in which the batteries are stacked. Further, the area of the main covers 110 and 110 ', which are the main areas of the battery covers 100 and 100', may correspond to the area of the mating surface of the battery to be coupled. Therefore, the battery covers 100 and 100 'may have at least one surface that is bent from the end portion to the battery side. For example, when the battery covers 100 and 100 'are rectangular, as shown in FIG. 1, the bent portions 120 and 120' may be formed from two surfaces and a portion of one surface. The bent portions 120 and 120 'may be formed to be thinner than other portions of the battery covers 100 and 100' since the bent portions 120 and 120 'extend from the main buckers 110 and 110'. The inclined surface may be formed as a thinnest portion of the battery cover 100 or 100 ', which is gradually narrowed in the extending direction.

According to the example of FIG. 1, the battery covers 100 and 100 'are manufactured by injecting one injection liquid, so that two battery covers 100 and 100' can be formed. Needless to say, this manufacturing number may be changed depending on the mold, and thus it is not limited to the example of FIG.

Here, the cut portion 10 may include a first cut portion 11 and a second cut portion 12. The first cut portion 11 is a portion hardened in a path that moves along the injection port of the mold when the injection liquid is injected and the second cut portion 12 is guided to the battery cover 100 side through the injection port It can be a hardened portion in the section where the "

Accordingly, in the case of FIG. 1, the first cut portion 11 may correspond to the vertical length of the upper mold when the injection port is formed in the upper and lower molds. When the injection liquid is injected so as to be inclined, the first cut portion 11 may be inclined when the injection port formed in the upper mold is inclined.

The injection liquid passing through the injection port can be moved to the space in which the battery cover 100 is to be formed by the second cut portion 12. The injection liquid can be guided in the moving direction by the mold during the movement. Details of the guidance of the injection liquid will be described in detail with reference to Fig.

FIG. 2 is a side view and a cut-away perspective view of a battery cover 100 according to an embodiment of the present invention. FIG. 2 (a) is a side view of a battery cover 100 according to an embodiment of the present invention, Is a cut-away perspective view of a battery cover 100 according to an embodiment of the present invention.

Referring to FIG. 2 (a), the cover injection liquid 1 can be divided into a battery cover 100 and a cutout portion 10, which can be separated and separated by a cutting line 13. The cutting line 13 means a point separated by the cutting means.

After the cutting process, the battery cover 100 is manufactured. In order that the shape of the battery cover 100 is uniform after the injection liquid is cured, it is required that the injection liquid is completely filled in the mold. In this case, it means that the injection liquid is injected into the inner space of the mold formed by the upper and lower molds of the mold to cushion the resin. In FIGS. 2 (a) and 2 (b) The injection liquid can be injected into the suction hole by the suction means.

This suction can induce the injection liquid to be moved to the reduced pressure space by reducing the internal space of the mold and overcome the disadvantage that it is difficult to move inside the narrow mold due to the viscosity of the liquid injection liquid through the suction . In addition, it is possible to expect the reduction of the molding time by promoting the movement. The injection liquid may partially flow into the suction hole formed in the mold by the above-described suction, and the introduced injection liquid may harden and appear to be hardened in the form of the suction units 101 and 101 '.

Further, the suction portions 101 and 101 'may be detached from the battery cover 100. Here, the dropout can be cut off after the injection liquid has been hardened, removed from the mold, and included in the separation process in which the battery cover 100 and the cut portion 10 are separated based on the cutting line 13. [ That is, the suction portions 101 and 101 'may be removed from the battery cover 100 before the battery cover 100 is positioned between the batteries.

On the other hand, referring to FIG. 2 (b), the direction in which the injection liquid is guided into the battery cover 100 in the second cut portion 12 is shown. And a first guide part (14) and a second guide part (15) in which the injection liquid is guided in the case of the second cut part (12). The first guide part 14 is formed by a guide structure formed in the mold and can extend from the rear end side of the injection port toward the battery cover 100 on the basis of the flow of the injection liquid. Here, the plurality of first guide portions 14 extend in the direction of the battery cover 100, but may extend away from each other. And the second guide portion spaced apart from each other may be a groove portion formed by a protruding guide structure in the mold. The liquid injection liquid can preferentially flow toward the relatively low first guide portion 15 side.

Since the flow of the injection liquid reaches the battery cover 100 at a predetermined interval, the distribution area of the injection liquid can be widened and the injection liquid more uniform in the distribution target area The battery cover 100 may be formed through the process of injecting the battery.

FIG. 3 is an exploded perspective view and an enlarged view of a battery cover 100 including an adhesive film 150 and 150 'according to an embodiment of the present invention. FIG. 3 (a) 3 (b) is an exploded perspective view of the battery cover 100 including the films 150 and 150 ', and FIG. 3 (b) is a perspective view illustrating the battery covers 100 and 100 with the adhesive films 150 and 150' ').

3 (a) and 3 (b), the battery cover 100 may further include an adhesive film 150, 150 '. The battery cover 100 may be positioned and adhered between the five or four battery cells when, for example, five or four battery cells are stacked to form one pack. In this case, the adhesive film 150, 150 'coated with the adhesive material may be bonded to the battery cover 100 for adhesion. The adhesive films 150 and 150 'may be adhered to the surface of the main cover 100 of the battery cover 100 where the battery cells are stacked.

Further, in order to prevent this problem, air holes 151 and 151 'are formed in the adhesive surfaces 150 and 150' of the adhesive film so that air can be interposed in the adhesive surface of the adhesive films 150 and 150 ' . The air which may be interposed through the through holes 151 and 151 'may be discharged to the outside through the through holes 151 and 151'. That is, by forming the through holes 151 and 151 ', it is possible to easily store the battery case 100 including the adhesive films 150 and 150' and to increase the adhesive strength of the adhesive films 150 and 150 '.

4 is a perspective view of a mold 200 according to an embodiment of the present invention.

Referring to FIG. 4, the mold 200 may include a top mold 210 and a bottom mold 220. The upper mold 210 can be formed with an injection port 211 through which the injection liquid can be injected into the upper mold 210. The upper mold 210 has an upper surface 210 of the cover injection liquid 1 formed after the injection liquid is injected into the mold 200 A pattern of a shape capable of forming a pattern.

The lower mold 220 is provided with a plurality of first injection liquid guiding portions 224 and a second injection liquid guiding portion 224 which are inclined portions through which the injection liquid moving downward due to self weight and suction can be guided, A liquid guide part 225 may be formed. Here, the first injection liquid guide portion 224 may be formed at a negative angle from the lower mold 220, and the injection liquid cured at this point may form a part of the second cut portion 12. When the injection liquid fills the cavity 201 inside the mold 200 from the side of the second cut portion 12 toward the side of the battery cover 100, the two first injection liquid- The portion 224 can ensure that the injection liquid can be uniformly injected into the cavity 201 of the mold 200 during the filling.

For example, when the injection liquid is injected into the battery cover 100 side, it can be moved in a semicircular shape and filled. Since the semicircle is spaced a certain distance and filled at a plurality of positions, filling is started with a wider area, Can be injected.

5 is an exploded view of a mold 200 according to an embodiment of the present invention.

Referring to FIG. 5, a portion of the upper mold 210 of the mold 200 may be cut to identify the battery cover 100 filled or hardened in the mold 200. 5, three suction holes 250 are formed in one battery cover 100, and suction portions 101 and 101 'are formed in the suction holes 250. As shown in FIG. The formation of the suction portions 100 and 101 'in the suction hole 250 may mean that the cavity 201 of the mold 200 is filled with the injection liquid.

Thus, when the injection liquid of the upper mold 210 and the lower mold 220 is contacted before injection, airtightness can be maintained. At least one of the upper and lower molds 210 and 220 may include a sealing member (not shown) to maintain the airtightness, and may be positioned on a surface where the upper and lower molds 210 and 220 contact each other. Of course, the sealing member may be supplied from the outside of the mold 200. For example, the contact line formed after the contact of the upper mold 210 and the lower mold 220 may be sealed by an external sealing member, so that airtightness may be maintained.

Meanwhile, the thickness of the battery covers 100 and 100 'manufactured through the mold 200 may be 1 mm or less. For example, 0.2 to 0.7 mm. In this case, 0.2 mm may be a bend (120 and 120 'in FIGS. 1 and 2), and 0.7 mm may be a main cover (110 and 110' in FIGS. 1 and 2). In the case of the bent portions (120 and 120 'in FIGS. 1 and 2), the thickness may be different for each position, unlike the main cover (110 and 110' in FIGS. 1 and 2). For example, the bent portions (120 and 120 'in FIGS. 1 and 2) may be formed in an inclined-shaped cross-section that is formed thinner away from the main cover (110 and 110' in FIGS. 1 and 2) . Further, as the thickness is reduced, it is difficult to move the injection liquid in the cavity 201 due to the viscosity of the injection liquid, so that the injection liquid can be sucked at a higher pressure.

6 is a flowchart illustrating a method of manufacturing the battery cover 100, 100 'according to an embodiment of the present invention.

First, the mold 200 can be prepared. Here, the preparation includes preparation of the sealing member described with reference to Fig. 5 as necessary. After the upper mold 210 and the lower mold 220 of the mold 200 are brought into contact with each other so as to maintain airtightness, casting formed in the upper mold 210 can be injected.

Here, since the cavity 201, which is the inner space of the mold 200, is kept airtight, the air inside the cavity 201 can not escape to the outside. therefore. Air is discharged to the outside of the mold 200 by the suction hole 250 which can be formed in at least one of the upper mold 210 and the lower mold 220. [ That is, air located in the cavity 201 can be sucked. In this process, since the cavity 201 can be decompressed, the injection liquid can be injected into the mold 200 by the pressure difference. (S2)

Further, in the course of the suction, the suction may be performed through the external suction means. Such suction may maintain the same pressure, but suction may be performed at a differential pressure. For example, since the pressure can be adjusted according to the size of the passage cross-sectional area of the injection liquid, the pressure can be differentially applied depending on the position at which the injection liquid moves. On the other hand, the injection liquid may be adjusted in relation to the viscosity of the injection liquid in addition to the size of the cross-sectional area through which it moves. For example, the relationship between the viscosity of the injection liquid itself or the viscosity of the injection liquid and the thickness of the battery cover 100, 100 'to be manufactured can be taken into consideration.

Subsequently, when the suction process is completed and the cavity 201 is filled with the injection liquid, the injection liquid can be hardened. The curing time depends on the temperature and the type of injection liquid, and can vary from several seconds to several hours (S3)

After the injection liquid is cured, the mold 200 is separated and removed from the upper mold 210 and the lower mold 220, and the battery covers 100 and 100 'to be manufactured from the cured molding can be cut. The cutting of the battery covers 100 and 100 'can be performed for separating from the cutouts 10 in Fig. 1, and the boundary line between the battery covers 100 and 100' and the cutouts 10 (Fig. 1) The cut line 13 can be cut. The cutting means separating the cut portion 10 and the battery cover 100, 100 ', which includes the meaning of cutting using a tool.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, . Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

1: Cover injection liquid
10: Cutting section
11: first cut portion
12: second cut section
13: Cutting line
14: first guide portion
15: second guide portion
100, 100 ': Battery cover
101, 101 ': suction part
110, 110 ': Main cover
120, 120 ': bent portion
150, 150 ': Adhesive film
151, 151 ': through hole
200: Mold
201: cavity
210:
211: inlet
220: Lower Type
224: first injection liquid guide part
225: second injection liquid guide part
250: Suction ball
S1: Mold placement step
S2: injection liquid injection step
S3: Air intake phase
S4: Injection liquid curing step

Claims (12)

A method of manufacturing a battery cover (10) coupled to a battery cell (10) of an electric vehicle,
Injection liquid is injected into the injection port formed in the upper mold of the mold,
Air in the cavity is sucked through a suction hole formed in at least one of the upper mold and the lower mold of the mold so that the injection liquid is filled in a cavity in the mold,
The injection liquid which has been filled is cured,
Wherein the cured product of the injection liquid is cut and separated along a cutting line which is divided into a battery cover and a cut portion.
The method according to claim 1,
Wherein at least one adhesive film is adhered to the surface of the battery cover after being cut along the cutting line by the cut portion.
The method of claim 2,
Wherein a plurality of through holes are formed in the adhesive film so that air can be discharged without being interposed on the surface to be adhered in the process of adhesion by surface contact with the battery cover.
The method according to claim 1,
Wherein the filling order of the injection liquid is filled sequentially with a portion of the injection port, the cut-out portion and the battery cover.
The method of claim 4,
Wherein the injection liquid is guided so that the injection liquid can be filled in at least two directions by the injection liquid guide portion when the injection liquid is filled from the cut portion to the battery cover side.
The method according to claim 1,
Wherein the battery cover is detachable from the battery cover when the suction hole is sucked into the suction hole by the suction hole, and the removal is included in the process of separating the battery cover and the cutoff portion. How to.
An upper mold on which an injection port through which injection liquid is injected is formed; And
And an injection liquid guide portion positioned to correspond to the upper mold and guiding the injection liquid passing through the injection port to be supplied in a plurality of directions,
At least one suction hole is formed in at least one of the upper and lower molds and the injection liquid is moved toward the suction hole by suction through the suction hole to fill a cavity between the upper mold and the lower mold , mold.
The method of claim 7,
Wherein the injection port is located at the center of the upper mold,
Wherein the injection liquid is moved so as to be symmetrical on both sides in the cavity with reference to the position of the injection port.
The method of claim 7,
Wherein the injection liquid guide portion is formed in a shape of a groove,
And at least one second injection liquid guiding portion protruded to be spaced apart from the first injection liquid guiding portion.
The method of claim 7,
Wherein the pressure sucked by the suction means is applied with a differential pressure until the cavity is filled with the injection liquid from the time when the injection liquid is injected into the injection port.
A battery cover, manufactured by a method of manufacturing a battery cover according to any one of claims 1 to 6,
A battery cover produced by a mold according to any one of claims 7 to 10.

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