KR20200060574A - Method for The Battery Lower Case - Google Patents

Abstract

The present invention relates to a method for manufacturing a battery lower case. According to the present invention, the method for manufacturing a battery lower case comprises a forming step of integrally forming first and second lower cases which receive a reinforcement unit by a prepreg while reinforcing the strength of the lower case through a reinforcement unit mounting step of installing the reinforcement unit. Accordingly, a lower case having a complex shape is manufactured diversely, thereby increasing diversity in kinds of lower cases. The number of parts is reduced through integrated molding of the first and second lower cases, thereby reducing costs of the lower case. Moreover, the weight of the lower case is decreased, thereby increasing mileage of an electric vehicle.

Description

Method for manufacturing a battery lower case {Method for The Battery Lower Case}

The present invention relates to a method for manufacturing a battery lower case, and more particularly, while maintaining the rigidity of the lower case itself, various types of lower cases of complex shapes are produced to increase the variety of lower case types, and the number of parts is reduced. It relates to a method for manufacturing a battery lower case to reduce the cost of the case and to reduce the weight of the lower case.

With the rapid increase in environmental pollution, the development of environmentally friendly vehicles such as electric vehicles (EVs, hydrogen fuel cell vehicles, etc.) around the world has been actively conducted for the purpose of developing alternative energy and preventing environmental pollution.

One of these eco-friendly vehicles, an electric vehicle, operates on the principle of rotating an automobile wheel by driving a motor with electricity generated by a fuel cell.

In addition, the electricity generated by the fuel cell is stored in the battery cell, the most essential technology of the electric vehicle is made by the battery system, and the constant driving distance for one charge is determined according to the capacity of the battery system.

The battery cell of the electric vehicle is disposed inside the case, and the case comprises a lower case in which the battery is stored and a cover covering the upper portion of the lower case.

In the case of the conventional battery lower case, steel or aluminum is used as a material, and the manufacturing method of the conventional battery lower case is made by a structure in which each component is welded and joined.

Steel has good strength as an iron material, but has the disadvantage of heavy weight and rust. And aluminum is light and hard to rust, but has the disadvantage of weak strength.

Therefore, in the case of the conventional battery lower case, an alloy of steel and aluminum is generally used to compensate for this disadvantage.

However, in the case of the conventional battery lower case manufacturing method, the forming method of steel is made of press, and aluminum is made of press or extrusion, die casting method, and when the shape of the lower case is complicated, each component is It was difficult to produce various lower cases with complex structures because they had to be molded separately and welded again in order to join them again.

In addition, in the case of the conventional battery lower case manufacturing method, the shape of the lower case is formed by each part, leading to an increase in the cost of parts due to an increase in the number of parts, and ultimately increasing the cost of the lower case to increase the cost of the lower case. There was a problem of raising the price.

In addition, in the case of the conventional battery lower case manufacturing method, since welding processing must be performed in order to join each component, there is a problem that human and physical resources are wasted due to an increase in the number of assembly processes.

Moreover, in the case of the conventional battery lower case manufacturing method, since the weight of steel itself is heavy, the weight of the lower case made of steel increases, and thus there is a problem that fuel efficiency of the electric vehicle deteriorates.

Republic of Korea Registered Patent Publication No. 10-1552483

The present invention is to solve the above problems, the object of the present invention is the first lower case and the second lower case to accommodate the reinforcement while reinforcing the rigidity of the lower case itself by a reinforcing part mounting step of installing a reinforcing part. By providing a prepreg forming step integrally, various types of lower cases of complex shapes are produced to increase the variety of lower case types, and the number of parts is reduced through the integral molding of the first lower case and the second lower case. To reduce the cost of the lower case, and to provide a method for manufacturing a battery lower case to improve the fuel efficiency of the electric vehicle by reducing the weight of the lower case.

In order to achieve the object of the present invention, a method for manufacturing a battery lower case according to the present invention includes a first lower case forming a lower portion, a reinforcement part installed on an upper portion of the first lower case, and the first lower case facing the first lower case. A second lower case which is installed on an upper portion of the reinforcing portion to form an upper portion of the lower case, and a first adhesive portion formed between an upper portion of the first lower case and a lower portion of the reinforcing portion to couple the first lower case and the reinforcing portion. . And a second adhesive portion formed between an upper portion of the reinforcing portion and a lower portion of the second lower case to combine the reinforcing portion and the second lower case, wherein the first lower case and the second lower case are in one direction. In manufacturing a battery lower case in which a battery of an electric vehicle formed of a prepreg is accommodated, the first lower case to manufacture the first lower case and the second lower case according to the type of the electric vehicle and the battery And a pre-determining step of determining the number of stacks of prepregs forming the second lower case and the stacking angle of the prepregs; and the number of stacks of prepregs determined through the pre-determination step and the stacking angle of the prepregs. A forming step of forming a case and the second lower case; a first lower case seating step of seating the first lower case on a jig; a reinforcement part seating step of seating the reinforcement part on the seated first lower case; A second lower case seating step of seating the second lower case on the seated reinforcement portion; And an inspection step of confirming a state in which the first lower case, the reinforcing part, and the second lower case are combined.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method forms a first adhesive portion between the first lower case and the reinforcing part after the first lower case seating step. The first adhesive portion forming step; may further include.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method is a first step of pressing the first lower case, the first adhesive portion, and the reinforcement portion after the step of seating the reinforcement portion Pressing step; may further include.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method is a method of forming a second adhesive portion between the second lower case and the reinforcing part after the first pressing step. 2 bonding part forming step; may further include.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method presses the second lower case, the second adhesive part, and the reinforcing part after the second lower case seating step. The second pressing step; may further include.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method may further include a heating step of heating the lower case after the second pressing step.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method includes a deburring step of removing burrs generated in the first lower case or the second lower case after the forming step; It may further include.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method may further include a cleaning step of removing foreign substances generated in the deburring step after the deburring step.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method may be heated for 30 minutes to 1 hour and 30 minutes at a temperature between 80 degrees and 100 degrees.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the method for manufacturing a battery lower case is 5 seconds to 300 in a state in which the inspection step is pressurized or depressurized to a pressure between 5 kpa and 10 kpa inside the lower case. After the time between seconds has elapsed, the presence or absence of air from the lower case is inspected to determine whether the first lower case, the first bonding portion, the reinforcing portion, the second bonding portion, and the second lower case are engaged. Can be checked.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method is a packaging step of packaging the lower case to store or transport the lower case after the inspection step. It can contain.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method includes a first lower case forming a lower portion, a reinforcement part installed on an upper portion of the first lower case, and the first A battery of an electric vehicle formed on an upper portion of the reinforcing portion facing the lower case and including a second lower case forming an upper portion of the lower case, wherein the first lower case and the second lower case are formed as a one-way prepreg. In manufacturing the battery lower case in which the housing is stored, forming the first lower case and the second lower case to manufacture the first lower case and the second lower case according to the type of the electric vehicle and the battery A pre-determination step of determining the number of stacks of prepregs and the stacking angle of the prepregs; The first lower case and the second lower case are formed by the number of stacks of prepregs and the stacking angle of the prepregs determined through the predetermined step. Forming step; first lower case seating step of seating the first lower case on a jig; reinforcing part seating step of seating the reinforcement part on the seated first lower case; upper part of the seated reinforcement part 2 a second lower case seating step for seating the lower case; A coupling step of coupling the first lower case, the reinforcing part and the second lower case; And an inspection step of confirming a state in which the first lower case, the reinforcing part, and the second lower case are combined.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method is a deburring step of removing burrs generated in the first lower case or the second lower case after the forming step. ; May further include.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method may further include a cleaning step of removing foreign substances generated in the deburring step after the deburring step.

In addition, in another preferred embodiment of the method for manufacturing a battery lower case according to the present invention, the battery lower case manufacturing method is a packaging step of packaging the lower case to store or transport the lower case after the inspection step. It can contain.

 The method for manufacturing a battery lower case according to the present invention is divided into a lower case of a complex structure that cannot be realized in conventional steel or aluminum, and is divided into individual parts as in the prior art, and is formed as a prepreg without a welding process for forming each part and joining them again. By forming the lower case and the second lower case, and providing a reinforcement part mounting step between the first lower case and the second lower case to reinforce the strength, there is an effect that various types of lower cases having a complicated structure can be produced.

In addition, the battery lower case manufacturing method according to the present invention includes a forming step of forming the first lower case and the second lower case into prepregs, so it is not necessary to mold each component as in the prior art, thereby reducing the number of components. By reducing the cost, it is possible to reduce the vehicle price of the electric vehicle and increase the demand for the electric vehicle of the consumer.

In addition, the method for manufacturing a battery lower case according to the present invention includes a forming step of forming a first lower case and a second lower case as prepregs that form the appearance of the lower case, and then forming each component for each component as before. There is no need to perform a welding process for joining, thereby reducing the number of assembling work and preventing human resources and material resources from being wasted.

Moreover, the method for manufacturing a battery lower case according to the present invention minimizes a heavy reinforcement part and includes a forming step of forming a first lower case and a second lower case into a prepreg, thereby reducing the weight of the lower case to make an electric vehicle. It has the effect of improving the fuel economy.

1 is a perspective view of a battery lower case manufactured by a manufacturing method according to an embodiment of the present invention.
2 is an exploded perspective view of a battery lower case manufactured by a manufacturing method according to an embodiment of the present invention.
3 shows a battery lower case manufactured by a manufacturing method according to an embodiment of the present invention.
FIG. 4 is a sectional view taken along line AA of FIG. 3.
FIG. 5 is a sectional view taken along line BB of FIG. 3.
FIG. 6 is a cross-sectional view of the CC portion of FIG. 3.
7 is a cross-sectional view of the EE portion of FIG. 3.
8 is an enlarged view of part A of FIG. 7.
9 is a cross-sectional view of the FF portion of FIG. 3.
10 is a view showing the analysis of the degree of curing of prepreg molding process conditions.
11 is a flowchart of a method for manufacturing a battery lower case according to an embodiment of the present invention.
12 is a flowchart of a method for manufacturing a battery lower case according to a second embodiment of the present invention.

Hereinafter, with reference to the drawings of a method for manufacturing a lower case of a battery according to an embodiment of the present invention will be described in detail. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And in the drawings, the size and thickness of the device may be exaggerated for convenience. Throughout the specification, the same reference numbers indicate the same components.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and have ordinary knowledge in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification. The size and relative size of layers and regions in the drawings may be exaggerated for clarity of explanation.

The terminology used herein is for describing the embodiments, and thus is not intended to limit the present invention. In the present specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, "comprise" and / or "comprising" refers to the components, steps, operations and / or elements mentioned above, the presence of one or more other components, steps, operations and / or elements. Or do not exclude additions.

1 shows a perspective view of a battery lower case manufactured by a manufacturing method according to an embodiment of the present invention, and FIG. 2 shows an exploded perspective view of a battery lower case manufactured by a manufacturing method according to an embodiment of the present invention.

3 shows a battery lower case manufactured by a manufacturing method according to an embodiment of the present invention, and FIG. 4 shows a cross-sectional view of part A-A of FIG. 3.

5 is a cross-sectional view of the B-B portion of FIG. 3, and FIG. 6 is a cross-sectional view of the C-C portion of FIG. 3.

7 is a cross-sectional view of the E-E portion of FIG. 3, and FIG. 8 is an enlarged view of portion A of FIG. 7.

FIG. 9 is a cross-sectional view of the F-F portion of FIG. 3, and FIG. 10 is a view showing an analysis of the degree of curing for each pre-preg molding process condition.

11 shows a procedure diagram of a method for manufacturing a battery lower case according to an embodiment of the present invention, and FIG. 12 shows a procedure diagram of a method for manufacturing a battery lower case according to a second embodiment of the present invention.

Definitions of terms used below are as follows. The "horizontal direction" means the horizontal direction, that is, the X-axis direction in FIG. 1, and the "vertical direction" means the height direction while being orthogonal to the horizontal direction, that is, the Z-axis direction in FIG. 1, and the "width direction" is horizontal Orthogonal to the vertical direction and the vertical direction, that means the Y-axis direction in FIG. In addition, the upper (upper) means an upward direction in the "vertical direction", that is, the direction toward the Z axis upward in FIG. 1, and the lower (downward) means a downward direction in the "vertical direction", that is, the lower Z axis in FIG. 1. It means the direction to head. In addition, the inside (inside) means the direction toward the center of the lower case, and the outside (outside) means the opposite part of the inside, that is, the outside.

In addition, the "front" means the direction in which the electric vehicle, in which the lower case is installed in the electric vehicle, is in front of the electric vehicle when driving, that is, the outside of the front portion 111 of the base portion in FIG. 1, and the "rear" is The position in which the lower case is installed in the electric vehicle is in the opposite direction to the direction in which the electric vehicle proceeds when driving, that is, the outside of the rear portion 112 of the base portion in FIG. 1, and the “left direction” refers to the electric vehicle. The position where the lower case is installed means the left side of the electric vehicle 90 degrees left in the direction in which the electric vehicle travels when the electric vehicle travels, that is, the outer side of the left side 113 of the base portion in FIG. 1, and the "right direction" means The position in which the lower case is installed in the electric vehicle refers to the outside of the right side 114 of the base portion 90 degrees to the right, that is, in the direction in which the electric vehicle travels when the electric vehicle travels to the right side of the electric vehicle.

A battery lower case 1 manufactured by a manufacturing method according to an embodiment of the present invention will be described with reference to FIGS. 1 and 3 to 10. 1 and 2, the battery lower case 1 manufactured by the manufacturing method according to the embodiment of the present invention includes a first lower case 50 and a reinforcement part 30. It includes a second lower case (10).

The battery lower case 1 serves to provide a space in which the battery of the electric vehicle is stored. The battery module of the electric vehicle is mounted inside the battery lower case 1.

The first lower case 50 serves to form a lower portion of the lower case 1. And, although not necessarily limited to, the first lower case 50 may be made of Vinyl Ester SMC or Carbon SMC.

In addition, the first lower case 50 is formed of a prepreg. In addition, the prepreg of the first lower case 50 may be formed of a one-way prepreg or a cross prepreg.

Carbon fiber is an innovative material that is stronger than steel and lighter than aluminum, but by itself is only a simple fiber or fabric, and is not meaningful in the form of a simple thread. Therefore, carbon fiber has meaning only as a composite material when it meets a matrix that can be produced in the form of a part while maintaining its shape and properties of an object.

Carbon Fiber Reinforced Plastic (CFRP) is a representative carbon fiber composite material with carbon fiber as the reinforcement agent and plastic as the base material. In the CFRP molding method, carbon fiber and plastic are mixed in a certain ratio, and then, an intermediate material is used to make an intermediate material in an easy-to-use form, and a method of making a composite part while carbon fiber and plastic meet immediately without using an intermediate material. Among them, the intermediate material in the case of using the intermediate material is a prepreg.

That is, prepreg is an abbreviation of pre-impregnated material, and means an intermediate material for a carbon fiber composite material in a sheet form in which resin and carbon fibers are impregnated in a predetermined ratio in advance.

If prepreg is used, the ratio of resin and carbon fiber can be precisely controlled, and prepreg in the form of sheet can be cut and used as desired in the desired fiber direction.

The use of the prepreg can reduce the variation in the ratio of the resin and the carbon fiber, overcome the limitations of the resin properties, that is, reinforce the stiffness, and have the advantage of implementing various complex shapes.

The type of prepreg is divided into glass fiber and carbon fiber according to the fiber type, and is divided into one-way prepreg, cross prepreg (or fabric prepreg) or tow-type prepreg having one directionality according to the method of manufacturing the fiber. .

The reinforcement part 3 is installed in the upper part of the first lower case 50 and the lower part of the second lower case 10 to reinforce the strength of the lower case 1.

The reinforcing portion 30 is not necessarily limited thereto, but may be made of steel or aluminum, and may be formed of an alloy of steel and aluminium to reduce weight while increasing strength. In this case, when the specific gravity of steel is 7.8 and the specific gravity of aluminum is 2.7, the strength is excellent.

The second lower case 10 serves to form an upper portion of the lower case 1. And, although not limited to this, the second lower case 10 may be made of Vinyl Ester SMC or Carbon SMC.

The second lower case 10 is installed on the upper portion of the reinforcing portion 30 (ie, vertically upward in FIG. 1) so as to face the first lower case 50. In addition, the second lower case 10 may be formed of a prepreg. In addition, the prepreg of the second lower case 10 may be formed of a one-way prepreg or a cross prepreg.

A battery lower case 1 manufactured by a manufacturing method according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 and 2, the battery lower case 1 manufactured by the manufacturing method according to the embodiment of the present invention includes a first lower case 10, a first adhesive portion 20, and a reinforcing portion 30 And a second lower case 50.

The battery lower case 1 serves to provide a space in which the battery of the electric vehicle is stored. The battery module of the electric vehicle is mounted inside the battery lower case 1.

The first lower case 50 serves to form a lower portion of the lower case 1. And, although not necessarily limited to, the first lower case 50 may be made of Vinyl Ester SMC or Carbon SMC. In addition, the first lower case 50 is formed of a prepreg. In addition, the prepreg of the first lower case 50 may be formed of a one-way prepreg or a cross prepreg.

The reinforcing part 30 is installed in the upper part of the first lower case 50 and the lower part of the second lower case 10 to reinforce the strength of the lower case 1. The reinforcing part 30 is not necessarily limited thereto, and may be made of steel or aluminum, and may be formed of an alloy of steel and aluminum to reduce weight while increasing strength. In this case, when the specific gravity of steel is 7.8 and the specific gravity of aluminum is 2.7, the strength is excellent.

The second lower case 10 serves to form an upper portion of the lower case 1. And, although not necessarily limited to, the second lower case 10 may be made of Vinyl Ester SMC or Carbon SMC. The second lower case 10 is installed on the upper portion of the reinforcing portion 30 (ie, vertically upward in FIG. 1) so as to face the first lower case 50. In addition, the second lower case 10 may be formed of a prepreg. In addition, the prepreg of the second lower case 10 may be formed of a one-way prepreg or a cross prepreg.

The first adhesive portion 40 is an upper portion of the first lower case 10 (upper to the vertical direction (Z) in FIG. 1) and the reinforcing portion 30 to combine the first lower case 50 and the reinforcing portion 30. ) Is formed between the lower portions (in the vertical direction (Z) in FIG. 1).

A battery lower case 1 manufactured by a manufacturing method according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 and 2, the battery lower case 1 manufactured by the manufacturing method according to the embodiment of the present invention includes a first lower case 10, a reinforcement part 30, and a second adhesive part 20 And a second lower case 50.

The battery lower case 1 serves to provide a space in which the battery of the electric vehicle is stored. The battery module of the electric vehicle is mounted inside the battery lower case 1.

The first lower case 50 serves to form a lower portion of the lower case 1. And, although not necessarily limited to, the first lower case 50 may be made of Vinyl Ester SMC or Carbon SMC. In addition, the first lower case 50 is formed of a prepreg. In addition, the prepreg of the first lower case 50 may be formed of a one-way prepreg or a cross prepreg.

The reinforcing part 30 is installed at the upper portion of the first lower case 50 and the lower portion of the second lower case 1 to reinforce the strength of the lower case 1. The reinforcing part 3 is not necessarily limited thereto, but may be made of steel or aluminum, and may be formed of an alloy of steel and aluminium to reduce weight while increasing strength. In this case, when the specific gravity of steel is 7.8 and the specific gravity of aluminum is 2.7, the strength is excellent.

The second lower case 10 serves to form an upper portion of the lower case 1. And, although not limited to this, the second lower case 10 may be made of Vinyl Ester SMC or Carbon SMC. The second lower case 10 is installed on the upper portion of the reinforcing portion 30 (ie, vertically upward in FIG. 1) so as to face the first lower case 50. In addition, the second lower case 10 may be formed of a prepreg. In addition, the prepreg of the second lower case 10 may be formed of a one-way prepreg or a cross prepreg.

The second adhesive portion 20 includes an upper portion of the reinforcing portion 30 (upward in the vertical direction (Z) in FIG. 1) and a second lower case 10 to combine the reinforcing portion 30 and the second lower case 10. ) Is formed between the lower part (in the vertical direction (Z) in FIG. 1).

The second lower case manufactured by the manufacturing method according to the embodiment of the present invention includes a base portion 11, a second mounting portion 12, a collision rib 13, and a reinforcing rib 14.

The base 11 serves to determine the shape of the second lower case 10. The base portion 11 may be formed in various shapes according to the type and shape of the electric vehicle.

The base portion 11 includes a front portion 111 that is installed adjacent to the front of the electric vehicle, a rear portion 112 that is installed adjacent to the rear of the electric vehicle, and a base portion that is installed adjacent to the left direction of the electric vehicle. It includes a left side 113 and a right side 114 of the base portion installed adjacent to the right direction of the electric vehicle.

The second mounting portion 12 is formed on the outside of the front portion 111, the rear side 112, the left side 113 and the right side 114 of the base portion to couple the base portion 11 to the electric vehicle.

3, the collision rib 13 includes a side rib 131, a front rib 132, and a rear rib 133.

The collision rib 13 is a base unit to protect the battery accommodated inside the lower case 1 by alleviating the impact applied to the lower case 1 when the electric vehicle collides with a vehicle or an installation on the road. (11).

When the side ribs 131 collide with installations on the vehicle or the road in the left and / or right directions of the electric vehicle, an impact is applied to the left side 113 and / or the right side 114 of the base portion, By lowering the impact applied to the left side 113 of the base portion and / or the right side 114 of the base portion, the left side surface 113 of the base portion and / or the right side 114 of the base portion is crushed and deformed to the inside of the lower case 1 It is installed to prevent damage to the battery installed on it.

Two or more lateral ribs 131 may be installed, and each of the lateral ribs 131 may be spaced apart from each other in the horizontal direction of the base portion 11 facing each other and on the left side 113 of the base portion and the right side 114 of the base portion. It is formed between the left side 113 of the base portion and the right side 114 of the base portion to be orthogonal.

The front rib 132 collides with a vehicle or an installation on the road from the front of the electric vehicle, and when an impact is applied to the front portion 111 of the base portion, the impact applied to the front portion 111 of the base portion is mitigated to reduce the impact on the front portion of the base portion. (111) is crushed and deformed to prevent damage to the battery installed inside the lower case (1).

One or more front ribs 132 may be installed, and the front portion 111 and the side ribs 131 between the front portion 111 of the base portion and the side ribs 131 installed adjacent to the front portion 111 of the base portion ).

When the rear rib 133 collides with a vehicle or an installation on the road from the rear of the electric vehicle, when an impact is applied to the rear portion 112 of the base portion, the impact applied to the rear portion 112 of the base portion is mitigated to reduce the rear portion of the base portion. (112) is crushed and deformed and installed to prevent damage to the battery installed inside the lower case (1).

One or more rear ribs 133 may be installed, and the rear portion 112 and the side ribs 131 may be provided between the rear portion 112 of the base portion and the side ribs 131 installed adjacent to the rear portion 112 of the base portion. ).

3, the second lower case 10 further includes a reinforcing rib 14.

One or more reinforcing ribs 14 may be installed, and the reinforcing ribs 14 are formed to be orthogonal to the side ribs 131 between the side ribs 131 to reinforce the strength of the second lower case 10. .

As shown in FIG. 7, the base portion 11 includes a protrusion 115, a first bent portion 116 and a second bend portion 117.

The protruding portion 115 is formed to protrude upward from the inner tip of the second mounting portion 12.

The first bent portion 116 is formed to extend stepwise inward while facing downward from the inner tip of the protruding portion 115. In addition, the first bent portion 116 may be installed to partially contact the first support portion 521 to be described later.

The second bent portion 117 is formed to extend stepwise inward while facing downward from an inner tip of the first bent portion 116. In addition, a portion of the second bent portion 117 may be installed to contact the reinforcing portion 30 to be described later.

As illustrated in FIG. 7, the second mounting portion 12 includes a fastening hole 121 and a stopper portion 122.

A plurality of fastening holes 121 are formed, each fastening hole 121 is formed through the second mounting portion 12, and each fastening hole 121 is formed to be spaced apart from each other. Screws, etc., are inserted through the fastening holes formed through, and the second lower case 10, the first lower case 50 and the mount portion of the electric vehicle are coupled to each other.

The stopper part 122 is second to prevent the first adhesive part 40 and / or the second adhesive part 20 from flowing inside the second mounting part 12 and inside the first mounting part 53. It is formed to protrude to the lower portion of the mounting portion 12.

As shown in FIG. 2, the first lower case 50 includes a housing part 51, a coupling part 52, and a first mounting part 53.

The housing part 51 is formed with a constant width and length to cover the lower portion of the first lower case 50.

The coupling portion 52 is located in a portion corresponding to the base portion 11 so as to be able to engage with the base portion 11, and the coupling portion 52 is formed outside the housing portion 51.

The coupling part 52 has a front surface, a rear surface, a left surface, and a right surface, like the base part 11. That is, the front surface of the coupling portion 52 is a portion corresponding to the front surface 111 of the base portion, the rear surface of the coupling portion 52 is a portion corresponding to the rear surface 112 of the base portion, and the left side surface of the coupling portion 52 The portion corresponding to the left side surface 113 of the base portion, and the right side surface of the coupling portion 52 is a portion corresponding to the right side side surface 114 of the base portion.

The first mounting portion 53 is provided with a plurality of coupling holes 531 formed through the portion corresponding to the fastening hole 121, it is formed on the front, rear, left and right sides of the coupling portion (52).

The housing part 51 includes a body part 511, a flange part 512, and a fixing part 513.

The body portion 511 serves to form the lower portion of the housing portion 51, and is formed with a constant width and length.

In addition, the body portion 511 may include one or more protruding ribs 5111 formed to protrude to the top of the body portion 511 to reinforce the strength of the body portion 511.

2, the protruding ribs 5111 may be formed in plural, and each protruding rib 5111 is formed to be spaced apart symmetrically while facing each other based on the center of the width direction of the body portion 511 , It may be formed in parallel along the horizontal direction of the body portion 511. When formed in such a structure, the protruding ribs 5111 can reinforce the strength of the body portion 511 high while maintaining balance at the top of the body portion 511.

The flange portion 512 is formed to be stepped outward while facing upward from the outer tip of the body portion 511 to seat the reinforcement portion 30 on the upper portion of the flange portion 512.

As illustrated in FIG. 8, the vertical length H based on the body portion 511 of the flange portion 512 and the vertical length h based on the body portion 511 of the protruding rib 5111 are the same. Can be formed.

Accordingly, the protruding ribs 5111 not only serve to reinforce the strength of the body portion 511, but also the protruding ribs 5111 are reinforced by seating a heavy reinforcing portion 30 on the upper portion together with the flange portion 512 Since the support portion 30 is supported from below, it is possible to prevent the heavy reinforcement portion 30 from being bent or deformed by a load.

The fixing part 513 is formed to be stepped outward while facing upward from the outer tip of the flange part 512 to prevent the reinforcement part 30 seated on the flange part 512 from being detached from the flange part 512. do.

When an electric vehicle suddenly breaks down, suddenly stops, moves on a slope, or collides with another vehicle or an installation on a road and the electric vehicle collides with the heavy reinforcement 30, it is accommodated in the upper part of the reinforcement 30 when it is released from the seated position. The battery may be damaged, and there is a problem that personal injury or property damage may occur due to an explosion of the battery.

As described above, in order to prevent the above-described problems from occurring, the present invention includes the heavy reinforcement portion 30 being seated on the upper portion of the flange portion 512, and at the same time, the reinforcement portion 30 is secured by the fixing portion 513. Reinforcing portion 30 is formed so as to surround the side and is fixed primarily without being separated from the position seated on the upper portion of the flange portion 512 by the fixing portion 513.

Accordingly, the reinforcement part 30 is primarily positioned at a position seated on the upper portion of the flange portion 512 even when the electric vehicle suddenly starts, suddenly stops, moves on a slope, or collides with another vehicle or an installation on a road or the electric vehicle. Since it is fixed and does not deviate from the flange portion 512, it is possible to protect the battery accommodated in the upper portion of the reinforcement portion 30.

Referring to FIGS. 7 and 8, the coupling portion 52 includes a first support portion 521 and a second support portion 522.

The first support part 521 is in contact with a part of the first bent part 116 to support the first bent part 116 and is formed to be stepped inward toward the bottom from the inner tip of the first mounting part 53.

That is, the first support part 521 is installed so that the first support part 521 and the first bent part are in contact with each other so as to support the load of the first bent part 116 under the first bent part 116. The portion 116 and the first support portion 521 can be fixed firmly so as not to move or deform.

The second support part 522 is formed to be stepped inward toward the bottom from the inner front end of the first support part 521. Specifically, the second bent portion 117 extends from the tip of the first bent portion 117 to be bent in the vertical direction toward the bottom, and extends from the lower end of the second bent portion 117 to be bent in the vertical direction. It is extended to bend horizontally toward the inside again.

Referring to FIGS. 7 and 8, the lower portion of the portion formed to be bent in the horizontal direction from the lower end of the second bent portion 117 to be bent horizontally is installed to be in contact with the upper portion of the reinforcing portion 30, and the flange portion ( The upper part of the 512) is installed so that some or all of them are in contact with the lower part of the reinforcement part 30.

That is, the first lower case 50 and the second lower case using screws or the like to penetrate the fastening hole 121 of the second mounting portion 12 and the coupling hole 531 of the first mounting portion 53 ( 10) When the fastening is in close contact, the upper portion of the reinforcing portion 30 is subjected to a force that the second bending portion 117 presses the reinforcing portion 30 downward, and the lower portion of the reinforcing portion 30 is a flange portion. (512) is to receive the force to press the reinforcement 30 to the top.

As described above, by installing the reinforcing portion 30 between the flange portion 512 and the second support portion 522, the second bending portion 117 and the flange portion 512 press the reinforcing portion 30, respectively. When pressed to act, the heavy reinforcing part 30 may be fixed secondarily firmly.

Moreover, since the first bent portion 116 is installed to partially contact the first support portion 521, the fastening hole 121 of the second mounting portion 12 and the coupling hole 531 of the first mounting portion 53 When the first lower case 50 and the second lower case 10 are fastened to each other by using screws or the like to penetrate the first bending part 116, the first bending part 116 has a first supporting part 521 ) Acts to press downward, and conversely, the first support 521 acts as the first support 521 presses the first bent portion 116 upward.

That is, in the portion where the first bent portion 116 and the first support portion 521 are contacted, a force acting in opposite directions acts, and through this, the second bent portion 117 and the flange portion 512 are applied. The forces pressing the reinforcing part 30 in opposite directions are reinforced.

Accordingly, the heavy reinforcing portion 30 may be securely and thirdly fixed by the first bent portion 116 and the first support portion 521.

When an electric vehicle suddenly breaks down, suddenly stops, moves on a slope, or collides with another vehicle or an installation on a road and the electric vehicle collides with the heavy reinforcement 30, it is accommodated in the upper part of the reinforcement 30 when it is released from the seated position. The battery may be damaged, and there is a problem that personal injury or property damage may occur due to an explosion of the battery.

As described above, in order to prevent the above problems from occurring, the present invention is to install the reinforcing portion 30 between the second bent portion 117 and the flange portion 512 to form the second bent portion 117 and the flange portion. The reinforcing section 30 is firmly and secondarily fixed by the pressure that the 512 presses each of the reinforcing sections 30 so that the forces acting oppositely, and the first bending section 116 is the first supporting section 521 ) To be in contact with the first bent portion 116 and the first support portion 522 so that a force acting in the opposite direction is applied to the portion in contact with each other, through which the second bent portion 117 The flange portion 512 further strengthens the force pressing the reinforcement portion 30 in opposite directions to each other to fix the heavy reinforcement portion 30 firmly and thirdly.

Accordingly, the reinforcing part 30 is fixed at a position seated on the upper portion of the flange portion 512 even when an electric vehicle suddenly stops, suddenly stops, moves a slope, or collides with another vehicle or an installation on a road or the electric vehicle. Since it does not deviate from the flange portion 512, it protects the battery accommodated in the upper portion of the reinforcement portion 30 to prevent damage to the battery accommodated in the upper portion of the reinforcement portion 30, thereby reducing the property damage, such as malfunction of the electric vehicle. In addition, it is possible to prevent personal injury or property damage caused by a safety accident that may occur due to an explosion of the battery.

The lower portion of the reinforcing portion 30 is installed to contact the upper portion of the flange portion 512 and the upper portion of the protruding rib 5111, and at the same time, the upper portion of the reinforcing portion 30 is the lower portion of the second bent portion 117, the reinforcing rib It can be installed to contact the lower portion of the (14), and the lower portion of the collision rib (13).

That is, the reinforcing portion 30 is installed so that the lower portion of the reinforcing portion 30 contacts not only the upper portion of the flange portion 512 described above, but also the upper portion of the protruding rib 5111, and the upper portion of the reinforcing portion 30 is described above. It is possible to fix the reinforcing part 30 more firmly and quaternarily by installing so as to contact not only the lower part of the second bent part 117 but also the lower part of the reinforcing rib 14 and the lower part of the collision rib 13.

The first lower case 50 and the second lower case 10 may be formed of a prepreg, and the first lower case 50 and the second lower case 10 may have strength depending on the position where they are installed in the electric vehicle. In order to reinforce, a plurality of prepregs may be stacked and integrally molded.

In addition, when the first lower case 50 and the second lower case 10 are made of a one-way prepreg, the prepregs are molded to prevent the warping of the prepregs that are stacked so that the stacking angles of the prepregs are different from each other. It can be molded.

time 50S 100S 150S 200S
thickness 4 sheets (1.2T) 91.1% 94.8% 96.6% 96.0% 6 sheets (1,8T) 90.2% 98.8% 97.7% 99.0% Chapter 8 (2.4T) 95.2% 96.8% 99.0% 99.5%

Table 1 shows the curing conditions for each prepreg thickness through DSC (Differential Scanning Calorinerty) curing degree analysis, and the unit of thickness T (thickess) represents 1T of 1 mm. The unit S (sec) of the heating time means seconds, and% means the degree of curing.

In addition, when the curing degree is 95% or more, it is possible to secure stable physical properties of the prepreg. That is, it has a meaning that the first lower case 50 and the second lower case 10 can be formed with a prepreg that satisfies the curing degree of 95% or more.

Referring to FIG. 9, the tensile strength and modulus of the prepreg according to the thickness and the heating time (prepreg forming time) are shown. In the thickness unit T (thickess), 1T represents 1 mm. The unit S (sec) of the heating time means seconds. In addition, the unit of tensile strength is MPa (Mega Pascal). The unit of elastic modulus is GPa (Giga pascal).

If the prepreg stacking angles of the first lower case 50 and the second lower case 10 are different depending on the direction in which an impact or a collision is applied by an installation on another vehicle or road to an electric vehicle, the minimum prepreg It can show the maximum performance of layered sur.

Specifically, the first mounting portion 53 of the first lower case 50 and the second mounting portion 12 of the second lower case 10 penetrate through the coupling hole 531 and the fastening hole 121, such as screws. As it is a part that is directly fastened to the electric vehicle, it is preferable that the first mounting part 53 and the second mounting part 12 are stacked with 8 layers of prepreg so as not to be deformed.

In addition, when laminating one-way prepregs, 8 layers of prepregs are arranged at an angle of 0 °, + 90 °, 0 °, -90 °, 0 °, + 90 °, 0 °, -90 °, respectively. The first mounting portion 53 and the second mounting portion 12 are not to be deformed.

In addition, since the reinforcing ribs 14 of the first lower case 10 are installed to reinforce the rigidity of the lower case 1, 5 layers of prepregs are stacked to further increase the rigidity of the reinforcing ribs 14 itself. It is preferred.

In addition, when laminating one-way prepregs, the reinforcement ribs 14 are arranged at an angle of + 90 °, + 45 °, 0 °, -45 ° -90 °, 0 °, -90 °, respectively, in 5 layers. The stiffness of itself can be further increased.

Moreover, the collision ribs 13 of the first lower case 10, that is, the side ribs 131, the front ribs 132, and the rear ribs 133, may be impacted or collided by an electric vehicle by an installation on another vehicle or road. It is preferable to stack four layers of prepregs in order to secure a repulsive force in the opposite direction to the applied direction (front, rear, side, right).

In addition, when laminating one-way prepregs, four layers of prepregs are stacked in the same direction to secure one directionality, and the force applied to the first lower case in each of the front, rear, side, and right directions is applied. It is preferable to stack four layers of one-way prepregs so as to have one direction horizontal to the direction of the force applied to the first lower case in each of the front, rear, lateral, or right directions so as to have a reaction force against the .

As described above, by varying the number of prepregs stacked for each part of the first lower case and the second lower case, the external impact applied to the electric vehicle is secured while the combination with the electric vehicle is secured by using the minimum number of prepregs. The lower case 1 with improved durability can also be formed.

Particularly, in the case of the prepreg in one direction, not only the number of the prepregs to be stacked as described above, but also the angles to be stacked are different and selectively applied depending on the part of the lower case 1 to combine with the lower case 1 and the electric vehicle. While being sturdy, it is possible to form a lower case 1 with increased durability against external shock applied to an electric vehicle.

A method for manufacturing a battery lower case according to an embodiment of the present invention will be described with reference to FIG. 11. As shown in FIG. 11, a method for manufacturing a battery lower case according to an embodiment of the present invention includes a predetermined step (S1) and a forming step ( S2), a first lower case seating step (S5), a reinforcement part seating step (S7), a second lower case seating step (S10) and an inspection step (S13).

The number of stacked prepregs forming the first lower case and the second lower case to manufacture the first lower case 50 and the second lower case 10 according to the type of the electric vehicle and the battery, and The lamination angle of the prepreg is determined in advance.

After the pre-determining step (S1), the first lower case and the second lower case are formed by the number of stackings of the prepreg determined through the pre-determining step and the stacking angle of the prepregs.

After the forming step (S2), the first lower case is mounted to seat the first lower case on the jig.

After the first lower case mounting step (S5), the reinforcing part is mounted on the seated first lower case.

After the reinforcing part mounting step (S7), the second lower case is mounted on the seated upper part of the reinforcing part.

After the second lower case mounting step (S10), the first lower case, the reinforcing part, and the second lower case are checked through the inspection step (S13).

Specifically, in the inspection step (S13), after the time between 5 seconds and 300 seconds has elapsed in the state of being pressurized or depressurized to a pressure between 5 kpa and 10 kpa inside the lower case, the presence or absence of air from the lower case is checked. The first lower case, the first adhesive portion, the reinforcing portion, the second adhesive portion, and inspects the bonding state of the second lower case.

As described above, the method for manufacturing a battery lower case according to an embodiment of the present invention divides a lower case of a complex structure that cannot be implemented in conventional steel or aluminum into each component as in the prior art, without forming a welding process for forming each component and joining it again. By forming the first lower case and the second lower case with a prepreg and providing a reinforcing part seating step between the first lower case and the second lower case, the strength of the lower case can be variously produced.

As shown in FIG. 11, the method for manufacturing a battery lower case according to an embodiment of the present invention includes a deburring step (S3), a cleaning step (S4), a first adhesive forming step (S6), a first pressing step (S8), and 2 may further include an adhesion forming step (S9), a second pressing step (S11), a heating step (S12), and a packaging step (S14).

In the deburring step (S3), the burrs generated in the first lower case or the second lower case are removed after the forming step (S2).

The cleaning step S4 removes foreign substances generated in the deburring step after the deburring step S3.

The first adhesive portion forming step (S6) forms a first adhesive portion between the first lower case and the reinforcing portion after the first lower case mounting step (S5).

The first pressing step (S8) is after the step of seating the reinforcement. The first lower case, the first adhesive portion, and the reinforcing portion are pressed.

In the second adhesive portion forming step S9, a second adhesive portion is formed between the second lower case and the reinforcing portion after the first pressing step S8.

The second pressing step (S11) presses the second lower case, the second adhesive portion, and the reinforcing portion after the second lower case mounting step (S10).

In the heating step S12, the lower case is heated after the second pressing step S11. Although not necessarily limited to this, the heating step (S12) is heated for 30 minutes to 1 hour and 30 minutes at a temperature between 80 degrees and 100 degrees. In the heating step, when the heating temperature is less than 80 degrees, the first adhesive portion and the second adhesive portion do not melt, so the adhesion does not proceed quickly and the strength of the adhesive weakens. When it exceeds 100 degrees, the first adhesive portion and the second adhesive portion melt and flow. There is a problem that the adhesion is not made well. In the heating step, when the heating time is less than 30 minutes, the first adhesive portion and the second adhesive portion are not sufficiently melted, so that adhesion is not strong, and when the heating time exceeds 1 hour and 30 minutes, the rigidity of the case is weakened. , There is a problem that the adhesive is not melted because the adhesive is too melted.

The packaging step (S14), after the inspection step (S13), packs the lower case to store or transport the lower case.

Accordingly, the method for manufacturing a battery lower case according to the present invention minimizes a heavy reinforcing part, and includes a forming step of forming a first lower case and a second lower case into a prepreg, thereby reducing the weight of the lower case, thereby reducing the weight of the electric vehicle. Can improve fuel economy.

A method of manufacturing a battery lower case according to another embodiment of the present invention will be described with reference to FIG. 12. 12, a method for manufacturing a battery lower case according to another embodiment of the present invention includes a predetermined step (F1), a forming step (F2), a deburring step (F3), a cleaning step (F4), and a first lower case seating. It includes a step (F5), a reinforcing part seating step (F6), a second lower case seating step (F7), a bonding step, a heating step (F8), an inspection step (F9), and a packaging step (F10).

 As illustrated in FIG. 12, the method for manufacturing a battery lower case according to another embodiment of the present invention is the same as that of each step of the method for manufacturing a battery lower case according to FIG. 11 and an embodiment of the present invention. Description of each step will be replaced with the above description, and a description will be given focusing on the decision steps different from FIG. 11.

The coupling step combines the first lower case, the reinforcing part, and the second lower case after the second lower case mounting step (F7). The first lower case, the reinforcing part, and the second lower case are firmly combined by the coupling step.

As described above, the method for manufacturing a battery lower case according to the present invention includes forming steps of forming a first lower case and a second lower case as prepregs that form the appearance of the lower case, and then forming each component for each component as before. Since it is not necessary to perform a welding process for joining, it is possible to prevent human resources and material resources from being wasted by reducing assembly work.

In the detailed description of the present invention described above, the present invention has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those skilled in the art will appreciate the invention described in the claims below. It will be understood that various modifications and changes may be made to the present invention without departing from the spirit and technical scope. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be determined by the claims.

S1: pre-determination stage, S2: formation stage,
S3: Deburring step, S4: Cleaning step,
S5: first lower case seating step, S6: first adhesive part forming step,
S7: Reinforcement seating system, S8: First pressurization step,
S9: second adhesive portion forming step, S10: second lower case seating step,
S11: second pressurization step, S12: heating step,
F1: pre-determination stage, F2: formation stage,
F3: Deburring step, F4: Cleaning step,
F5: first lower case seating step, F6: reinforcement seating step,
F7: Second lower case seating step, F8: Heating step,

Claims (15)

A first lower case forming a lower portion, a reinforcing portion installed on an upper portion of the first lower case, and a second lower case installed on an upper portion of the reinforcing portion facing the first lower case to form an upper portion of the lower case , A first adhesive portion formed between the upper portion of the first lower case and the lower portion of the reinforcing portion to couple the first lower case and the reinforcing portion. And a second adhesive portion formed between an upper portion of the reinforcing portion and a lower portion of the second lower case to couple the reinforcing portion and the second lower case, wherein the first lower case and the second lower case are in one direction. In manufacturing a battery lower case in which the battery of the electric vehicle formed of a prepreg is accommodated,
The number of stacks of prepregs forming the first lower case and the second lower case and the stacking angle of the prepregs for manufacturing the first lower case and the second lower case according to the type of the electric vehicle and the battery Pre-determining step of determining;
A forming step of forming the first lower case and the second lower case at the stacking angle of the prepreg and the stacking angle of the prepreg determined through the predetermined step;
A first lower case seating step of seating the first lower case on a jig;
A reinforcement seating step of seating the reinforcement part on the seated first lower case;
A second lower case seating step of seating the second lower case on the seated upper portion of the reinforcing part; And
The first lower case, the reinforcing portion and the second lower case inspection step of checking the combined state; Battery lower case manufacturing method comprising a
According to claim 1,
After the first lower case seating step
And forming a first adhesive portion between the first lower case and the reinforcing portion.
According to claim 2,
After the step of seating the reinforcement.
The first lower case, the first adhesive portion, and a first pressing step of pressing the reinforcement; battery lower case manufacturing method further comprising a.
According to claim 3,
After the first pressing step,
And a second adhesive portion forming step of forming a second adhesive portion between the second lower case and the reinforcement portion.
The method of claim 4,
After the second lower case seating step.
And a second pressing step of pressing the second lower case, the second adhesive portion, and the reinforcing portion.
The method of claim 5,
After the second pressing step,
Method for manufacturing a battery lower case further comprising; a heating step of heating the lower case.
The method of claim 6,
After the forming step,
And a deburring step of removing burrs generated in the first lower case or the second lower case.
The method of claim 7,
After the deburring step,
Method for manufacturing a battery lower case further comprising; a cleaning step of removing the foreign matter generated in the deburring step.
The method of claim 8,
The heating step is a battery lower case manufacturing method characterized in that heating for 30 minutes to 1 hour and 30 minutes at a temperature between 80 and 100 degrees.
The method of claim 9,
In the inspection step, after the time between 5 seconds and 300 seconds has elapsed in the state in which the pressure is reduced or pressurized to a pressure between 5 kpa and 10 kpa inside the lower case, the presence or absence of air from the lower case is inspected to check the first Method for manufacturing a battery lower case, characterized in that the inspection state of the lower case, the first adhesive portion, the reinforcing portion, the second adhesive portion, and the second lower case.
The method of claim 10,
After the inspection step,
A method of manufacturing a battery lower case, further comprising a packaging step of packaging the lower case to store or transport the lower case.
A first lower case forming a lower portion, a reinforcing portion installed on an upper portion of the first lower case, and a second lower case installed on an upper portion of the reinforcing portion facing the first lower case to form an upper portion of the lower case Including, In the first lower case and the second lower case in manufacturing a battery lower case in which the battery of the electric vehicle formed of a one-way prepreg is accommodated,
The number of stacks of prepregs forming the first lower case and the second lower case and the stacking angle of the prepregs for manufacturing the first lower case and the second lower case according to the type of the electric vehicle and the battery Pre-determining step of determining;
A forming step of forming the first lower case and the second lower case with the number of stackings of the prepregs and the stacking angle of the prepregs determined through the predetermined step;
A first lower case seating step of seating the first lower case on a jig;
A reinforcement seating step of seating the reinforcement part on the seated first lower case;
A second lower case seating step of seating the second lower case on the seated upper portion of the reinforcing part;
A coupling step of coupling the first lower case, the reinforcing part and the second lower case; And
The first lower case, the reinforcing portion and the second lower case inspection step of checking the combined state; Battery lower case manufacturing method comprising a.
The method of claim 12,
After the forming step,
And a deburring step of removing burrs generated in the first lower case or the second lower case.
The method of claim 13,
After the deburring step,
Method for manufacturing a battery lower case further comprising; a cleaning step of removing the foreign matter generated in the deburring step.
The method of claim 14,
After the inspection step,
A method of manufacturing a battery lower case, further comprising a packaging step of packaging the lower case to store or transport the lower case.

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