KR102326468B1 - Manufacturing method of aluminum battery case for vehicle - Google Patents

Abstract

The present invention relates to a method for manufacturing an aluminum battery case for a vehicle, wherein an upper case (110) can be formed into one piece by using one aluminum plate. The uppercase in which a first mounting unit (111) has a predetermined depth and a second mounting unit (112) has a depth that is at least 2.5 times deeper than the first mounting unit (111), and the mounting unit (111) and unit (112) are continuously connected.

Description

Manufacturing method of aluminum battery case for vehicle

The present invention relates to a method for manufacturing an aluminum battery case for a vehicle, and more particularly, to a method for manufacturing an upper case in which a first mounting part having a predetermined depth and a second mounting part having a deeper depth than the first mounting part are continuously connected. It is a technology related to a method of manufacturing using an aluminum plate.

In general, a hybrid electric vehicle, a fuel cell vehicle, and an electric vehicle are all vehicles that use an electric motor to drive the vehicle. It is configured to supply necessary power while repeatedly charging and discharging while the vehicle is running.

The high voltage battery pack as described above typically includes a battery case, a plurality of battery modules mounted in the battery case, and a BMS (Battery) that detects the voltage, current and temperature of each unit cell constituting the battery module and controls the operation. Management System) is included.

Battery cases are usually made of steel or aluminum. Steel battery cases are cheaper than aluminum and have the advantage of high strength, but they are heavy and have the disadvantage of adversely affecting fuel efficiency. , Recently, the use of aluminum battery cases that have good thermal conductivity and can achieve weight reduction and fuel efficiency improvement through weight reduction is increasing.

As shown in FIG. 1 , the aluminum battery case 100 includes an upper case 110 and a lower case 120 , and in a structure in which the upper case 110 and the lower case 120 are airtightly coupled, the The battery module and BMS are installed in the interior space.

In order to increase the mileage of the vehicle, a large-capacity battery module must be mounted in the battery case 100. For this, the upper case 110 includes a first mounting part 111 and a first mounting part having a predetermined depth d1. The second mounting portion 112 having a deeper depth d2 than (111) may have a configuration in which it is continuously connected.

The second mounting unit 112 is usually 2.5 times deeper than the first mounting unit 111 , so that a large-capacity battery module in size can be mounted.

In the case of manufacturing the upper case 110 having the first mounting portion 111 and the second mounting portion 112 having different depths d1 and d2 as described above, in the prior art, the first mounting portion 111 using an aluminum plate. and the second mounting portion 112 were separately manufactured, and then a method of combining the first mounting portion 111 and the second mounting portion 112 by welding was used, which results in excessive cost and time required for manufacturing In particular, there is a disadvantage that the connection portion of the first mounting portion 111 and the second mounting portion 112 is not well maintained airtight.

The upper case 110 having the first mounting part 111 and the second mounting part 112 is not manufactured in one piece using one aluminum plate, but as described above, the first mounting part 111 and the second mounting part ( 112) is manufactured as two separate parts and then joined by welding because aluminum has a lower elongation than steel and has a relatively high work hardening index, which is disadvantageous in terms of formability. , in particular, since the depth d2 of the second mounting part 112 is deep, quality problems such as cracks occur when molding by a general drawing method, and due to this problem, the depth d1, d2 ) When manufacturing the upper case 110 having the first mounting portion 111 and the second mounting portion 112 different from each other, it was difficult to manufacture as one piece using one aluminum plate.

The matters described as the background art above are only for improving the understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

Korean Patent Publication No. 10-2020-0020482

The present invention is a vehicle aluminum battery that uses one aluminum plate to manufacture an upper case in which a first mounting part having a predetermined depth and a second mounting part having a depth at least 2.5 times greater than that of the first mounting part are continuously connected. As a manufacturing method of the case, the cost and time required for manufacturing can be saved through this, and in particular, the purpose is to improve the quality of the finished product compared to the conventional technique of manufacturing two pieces.

The present invention for achieving the object of the above bar, a first mounting portion having a predetermined depth, and a second mounting portion having a deeper depth than the first mounting portion for manufacturing an upper case formed to be continuously connected to the aluminum battery case manufacturing As a method, a blanking processing step of blanking the aluminum plate to produce a base panel of 1 piece; a primary drawing processing step of manufacturing a primary processed product having a preliminary mounting portion having a concave shape of a predetermined depth by primary drawing processing of a portion of the base panel; annealing processing step of producing a secondary processed product in which stress is removed from the primary processed product by high-frequency heat treatment of the primary processed product to include the pre-mounted part; The secondary processing product is subjected to secondary drawing processing, and the remaining parts except for the preliminary mounting part are processed into the first mounting part having a predetermined depth, and at the same time, the preliminary mounting part is processed again as a second mounting part having a deeper depth than the first mounting part. It is characterized in that it includes; a secondary drawing processing step of manufacturing the upper case.

When manufacturing the base panel in the blanking processing step, it is characterized in that the edges that adversely affect the formability during the primary drawing processing are also cut so that the edge of the base panel is formed into an inclined surface.

The inclined surface of the base panel is characterized in that it is formed as both edges of the portion where the preliminary mounting portion is located are cut together during the blanking process.

In the first drawing processing step, a primary processing product having a preliminary mounting part is manufactured using an upper die, a blanking holder, a cushion pin and a gas spring, and a primary drawing mold having a punch; When the base panel is placed on the blank holder and the lowering upper die comes into contact with the base panel placed on the blank holder, the punch rises and the production of the primary processed product having the preliminary mounting part from the base panel is completed, characterized in that do.

The step of manufacturing the primary workpiece may include: a first step of placing a base panel on a blank holder in a state in which the upper die is spaced apart from the upper side of the blanking holder; a second step in which the upper die descends and contacts the base panel mounted on the blank holder, and the cushion pin contacts the blank holder; As the upper die continues to descend, the gas spring comes into contact with the blank holder, and the cushion pin presses the blank holder from below to fix the base panel placed on the blank holder with the force of the cushion pin, and the punch rises and the base panel Step 3 of starting the molding of the pre-mounted part; and the gas spring presses the blank holder together with the cushion pin from below to fix the base panel mounted on the blank holder by the combined force of the gas spring and the cushion pin, and the continuous rise of the punch forms the pre-mounted part It is characterized in that it includes a; step 4 in which the production of the primary processed product is completed by completing the.

In the secondary drawing processing step, an upper case of a finished product having a first mounting part and a second mounting part is manufactured using a secondary drawing mold having an upper die, a blanking holder, a cushion pin and a gas spring, and a punch; The upper case of the finished product having the first mounting part and the second mounting part from the secondary processed product as the descending upper die comes into contact with the secondary processed product by placing the secondary processed product that has completed the annealing processing on the blank holder and the punch. It is characterized in that the production is completed.

The manufacturing of the upper case of the finished product includes: a first step in which the upper die is placed on the blanking holder and the punch in a state spaced apart from the upper side, and the gas spring is in contact with the blank holder; a second step in which the upper die descends and comes into contact with the secondary processed product placed on the blank holder; As the upper die continues to descend, the cushion pin contacts the blank holder, and the gas spring presses the blank holder from below to fix the secondary processed product by the force of the gas spring, and the rest of the secondary processed product except for the pre-mounted part a third step of starting molding into a first mounting part having a predetermined depth by pressing the punch; And the cushion pin presses the blank holder together with the gas spring from below to fix the secondary processed product by the combined force of the gas spring and the cushion pin, and the continuous lowering of the upper die completes the molding of the first mounting part. and at the same time, the fourth step of completing the manufacture of the upper case of the finished product as the pre-mounting part is molded into the second mounting part.

The depth of the preliminary mounting portion provided in the primary processed product is characterized in that it is molded to be approximately 60% to 80% of the depth of the second mounting portion of the upper case, which is the final finished product.

The depth of the second mounting portion in the upper case of the finished product is characterized in that it is molded to be at least 2.5 times deeper than the depth of the first mounting portion.

In an embodiment according to the present invention, an upper case in which a first mounting part having a predetermined depth and a second mounting part having a depth at least 2.5 times greater than that of the first mounting part is continuously connected is manufactured using one aluminum plate as 1 piece As a manufacturing method, it is possible to save the cost and time required for manufacturing, and in particular, there is an effect that can improve the quality of the finished product compared to the conventional technique of manufacturing two pieces.

1 is a view for explaining an aluminum battery case;
2 is a view for explaining a method of manufacturing an aluminum battery case according to the present invention;
3 to 4 are views for explaining a method of manufacturing an aluminum battery case using the primary and secondary drawing molds of the present invention.

Specific structural or functional descriptions of the embodiments of the present invention disclosed in the present specification or application are only exemplified for the purpose of describing the embodiments according to the present invention, and the embodiments according to the present invention are implemented in various forms. and should not be construed as being limited to the embodiments described in the present specification or application.

Since the embodiment according to the present invention may have various changes and may have various forms, specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiment according to the concept of the present invention to a specific disclosed form, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another, for example, without departing from the scope of rights according to the inventive concept, a first component may be termed a second component, and similarly The second component may also be referred to as the first component.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle. Other expressions describing the relationship between elements, such as "between" and "immediately between" or "neighboring to" and "directly adjacent to", should be interpreted similarly.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate that the specified feature, number, step, operation, component, part, or a combination thereof exists, and includes one or more other features or numbers. , it should be understood that it does not preclude the existence or addition of steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as meanings consistent with the context of the related art, and unless explicitly defined in the present specification, they are not to be interpreted in an ideal or excessively formal meaning. .

Hereinafter, a method of manufacturing an aluminum battery case for a vehicle according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The vehicle aluminum battery case 100 includes an upper case 110 and a lower case 120 as shown in FIG. 1 , and in a structure in which the upper case 110 and the lower case 120 are airtightly coupled. A battery module and a BMS are installed in the inner space.

In order to increase the mileage of the vehicle, a large-capacity battery module must be mounted in the battery case 100. For this, the upper case 110 includes a first mounting part 111 and a first mounting part having a predetermined depth d1. The second mounting portion 112 having a deeper depth d2 than (111) may have a configuration in which it is continuously connected.

The present invention is a manufacturing method for manufacturing the upper case 110 of the finished product having the first mounting portion 111 and the second mounting portion 112 using one aluminum plate in one piece.

That is, in the method of manufacturing an aluminum battery case for a vehicle according to the present invention, as shown in FIG. 2 , a blanking process of an aluminum plate 10 having a predetermined cross-sectional thickness to produce a base panel 20 of 1 piece blanking step; a primary drawing processing step of manufacturing a primary processed product 30 having a preliminary mounting portion 31 having a concave shape of a predetermined depth by primary drawing processing of a portion of the base panel 20; Annealing processing step of manufacturing a secondary workpiece 40 from which stress is removed from the primary workpiece 30 by high-frequency heat treatment of the primary workpiece 30 to include the pre-mounting part 31; The secondary processing product 40 is subjected to secondary drawing processing to process the remaining parts except for the preliminary mounting part 31 into the first mounting part 111 having a predetermined depth, and at the same time, the preliminary mounting part 31 is the first mounting part 111 and a secondary drawing processing step of manufacturing the upper case 110 of the finished product by processing it again with a deeper second mounting part 112 .

When the aluminum plate 10 is blanked and manufactured into the base panel 20, the corners that adversely affect the formability during the primary drawing process are also cut so that the corners of the base panel 20 are formed into the inclined surfaces 21.

Here, the inclined surface 21 of the base panel 20 has a structure formed as both edges of the portion where the preliminary mounting part 31 is located are cut together during the blanking process.

When forming the pre-mounting part 31 from the base panel 20 through the primary drawing process, if both side corners of the part where the pre-mounting part 31 is located remain as a flat wide area, there is a risk of concentration of stress during the drawing process There is, and there is a possibility that cracks may occur due to this, so the present invention also cuts the corner of one end where the pre-mounting part 31 is located when the aluminum plate 10 is blanked and manufactured into the base panel 20, followed by cutting It is designed to improve the formability during the primary drawing process performed by work.

The preliminary mounting portion 31 of the primary processed product 30 produced through the primary drawing processing has a depth d3 of the second mounting portion 112 of the upper case 110, which is the final finished product, based on the depth d2. It is molded to a level of approximately 60% to 80%.

When the pre-mounting part 31 is formed through the primary drawing process in the base panel 20, the stress is concentrated on the forming part of the pre-mounting part 31, and in this situation, if the secondary drawing process, which is a follow-up operation, is immediately performed, the stress is reduced. There is a high risk of cracks occurring in concentrated areas.

Therefore, the present invention manufactures the primary workpiece 30 having the preliminary mounting part 31 through the primary drawing processing, and then annealing the primary processed product 30 to include the preliminary mounting part 31 by high frequency heat treatment. It is characterized in that the secondary processed product 40 from which the stress is removed from the primary processed product 30 by operation is produced.

Reference numeral 41 denotes a heat treatment unit on which the annealing operation is completed, and in the drawing, the heat treatment unit 41 is shown as an example to include only the preliminary mounting unit 31 , but the entire secondary processed product 40 may be heat-treated.

When the production of the secondary processed product 40 is completed, secondary drawing processing is performed as the next process, and the secondary processing product 40 is manufactured into the upper case 110 of the finished product through the secondary drawing processing.

During the secondary drawing processing, the remainder of the secondary workpiece 40 except for the preliminary mounting part 31 is processed into the first mounting part 111 having a predetermined depth d1, and at the same time the preliminary mounting part 31 is the first mounting part 111. A deep drawing process is performed with the second mounting portion 112 having a deeper depth d2.

The depth d2 of the second mounting part 112 in the upper case 100 of the finished product is preferably molded to be at least 2.5 times deeper than the depth 111 of the first mounting part 111, through which the second mounting part ( 112) may be equipped with a large-capacity battery module.

3 shows a primary drawing mold for manufacturing the base panel 20 as a primary processed product 30 having a preliminary mounting part 31, and the primary processing product 30 is manufactured using the primary drawing mold. The process is shown.

The primary drawing mold 500 includes an upper die 510 moving up and down, a blanking holder 520 on which the base panel 20 is seated, and a plurality of cushion pins 530 that press and support the blanking holder 520 from below. And the gas spring 540, the base panel 20 by pressing the configuration including a punch 550 for forming the pre-mounting part (31).

When the upper die 510 is placed on the blank holder 520 in the first step spaced apart from the upper side of the blanking holder 520, the upper die 510 is lowered (arrow M1) in the second step. In contact with the base panel 20 placed on the blank holder 520 , the cushion pin 530 is in contact with the blank holder 520 .

In step 3, as the upper die 510 continues to descend (arrow M1), the gas spring 540 simply contacts the blank holder 520, and the cushion pin 530 presses the blank holder 520 from below to hold the blank holder. The base panel 20 placed on the 520 is fixed by the force (arrow F1) of the cushion pin 530, and the punch 550 rises (arrow M2), and the pre-mounting part 31 from the base panel 20 ) starts forming.

When the cushion pin 530 presses the blank holder 520 from the bottom, a pressing force of approximately 50 TON is applied, and the base panel 20 placed on the blank holder 520 is in a fixed state as a weak force. When the punch 550 rises in the state, the base panel 20 moves along the movement direction of the punch 550 until wrinkles are generated in the base panel 20 (material around the pre-mounting part is a pre-mounted part together with the punch) (movement sucked into the groove of the pre-mounting part 31) is started.

In step 4, the gas spring 540 presses the blank holder 520 together with the cushion pin 530 from the bottom so that the base panel 20 placed on the blank holder 520 is moved by the force of the gas spring 540 (arrow F2). It is fixed by the combined force (F1 + F2) of the cushion pin 530 and the force (arrow F1), and the continuous rise of the punch 550 completes the molding of the pre-mounting part 31, through which the base panel From (20), the production of the primary processed product (30) having the preliminary mounting portion (31) is completed.

When the cushion pin 530 and the gas spring 540 together press the blank holder 520 from below, a pressing force of approximately 80 TON is applied, and the base panel 20 placed on the blank holder 520 is a strong force. It becomes a fixed state, and by raising the punch 550 in the fixed state with such a strong force, the production of the primary workpiece 30 having the pre-mounting part 31 is completed.

4 shows a secondary drawing mold for manufacturing a secondary processed product 40 into an upper case 110 of a finished product having a first mounting part 111 and a second mounting part 112, and the secondary drawing mold is shown. The process of manufacturing the upper case 110 by using is shown.

The secondary drawing mold 600 is configured to include an upper die 610 moving up and down, a blanking holder 620 , a cushion pin 630 and a gas spring 640 , and a punch 650 .

In the first step in which the upper die 610 is spaced upward, the secondary processed product 40 is placed on the blank holder 620 and the punch 650, at this time the gas spring 640 is in contact with the blank holder 520. .

In the second step, the upper die 610 descends (arrow M11) and comes into contact with the secondary workpiece 40 placed on the blank holder 620 .

In step 3, as the upper die 610 continues to descend, the cushion pin 630 simply comes into contact with the blank holder 620, and the gas spring 640 presses the blank holder 620 from below to make the secondary processed product 40. is fixed by the force (arrow F11) of the gas spring 640, and the punch 650 presses the rest of the secondary processing product 40 except for the pre-mounted part 31, and the first mounting part having a predetermined depth ( 111) to start molding.

When the gas spring 640 presses the blank holder 620 from below, a pressing force of approximately 60 TON is applied, and the secondary processed product 40 placed on the blank holder 620 is in a fixed state as a weak force, In this state, when the punch 650 presses the remaining portions except for the preliminary mounting portion 31, the remaining portions of the secondary processed product 40 excluding the preliminary mounting portion 31 move together along the movement direction of the punch 650. Forming of the first mounting portion 111 is started.

In step 4, the cushion pin 630 presses the blank holder 620 together with the gas spring 640 from the bottom to hold the secondary processed product 40 by the force of the gas spring 640 (arrow F11) and the cushion pin 630. It is fixed by the combined force (F1 + F2) of the force (arrow F12), and while the molding of the first mounting part 111 is completed by the continuous descent of the upper die 610, the preliminary mounting part 31 is attached to the second mounting part ( 112), and through this, the production of the upper case 110 of the finished product having the first mounting portion 111 and the second mounting portion 112 from the secondary processed product 40 is completed.

When the cushion pin 630 and the gas spring 640 together press the blank holder 620 from below, a pressing force of approximately 120 TON is applied, and the secondary processed product 40 placed on the blank holder 620 is a strong force. It is in a fixed state as, and in the state where it is fixed as a strong force in this way, the production of the upper case 110 of the finished product having the first mounting part 111 and the second mounting part 112 is completed by the pressing force of the punch 650. will do

As described above, in the embodiment according to the present invention, the first mounting portion 111 having a predetermined depth and the second mounting portion 112 having a depth at least 2.5 times greater than that of the first mounting portion 111 are continuously connected. It is a manufacturing method of manufacturing the upper case 110 in one piece using one aluminum plate, and through this, the cost and time required for production can be saved, and in particular, the quality of the finished product is improved compared to the conventional method of manufacturing the upper case 110 in two pieces. There are advantages that can be achieved.

Although the present invention has been shown and described with reference to specific embodiments, it is within the art that the present invention can be variously improved and changed without departing from the spirit of the present invention provided by the following claims. It will be obvious to those of ordinary skill in the art.

10 - Aluminum plate 20 - Base panel
21 - inclined plane 30 - primary workpiece
31 - spare part 40 - secondary processed product
41 - heat treatment section 100 - aluminum battery case
110 - upper case 111 - first mounting part
112 - second mounting part 120 - lower case
500 - 1st drawing mold 510,610 - Upper die
520,620 - Blanking Holder 530,630 - Cushion Pin
540,640 - gas spring 550,650 - punch
600 - 1st drawing mold d1 - Depth of first mounting part
d2 - depth of second mount d3 - depth of spare mount

Claims (9)

A method of manufacturing an aluminum battery case for manufacturing an upper case in which a first mounting part having a predetermined depth, and a second mounting part having a deeper depth than the first mounting part are continuously connected,
A blanking processing step of manufacturing an aluminum plate into a one-piece base panel by blanking;
a primary drawing processing step of manufacturing a primary processed product having a preliminary mounting portion having a concave shape of a predetermined depth by primary drawing processing of a portion of the base panel;
annealing processing step of producing a secondary processed product in which stress is removed from the primary processed product by high-frequency heat treatment of the primary processed product to include the pre-mounted part;
The secondary processing product is subjected to secondary drawing processing, and the remaining parts except for the preliminary mounting part are processed into the first mounting part having a predetermined depth, and at the same time, the preliminary mounting part is processed again as a second mounting part having a deeper depth than the first mounting part. including a secondary drawing processing step of manufacturing the upper case;
The first drawing processing step,
Step 1 of placing the base panel on the blank holder in a state where the upper die is spaced apart from the upper side of the blanking holder;
a second step in which the upper die descends and contacts the base panel mounted on the blank holder, and the cushion pin contacts the blank holder;
As the upper die continues to descend, the gas spring comes into contact with the blank holder, and the cushion pin presses the blank holder from below to fix the base panel placed on the blank holder with the force of the cushion pin, and the punch rises and the base panel Step 3 of starting the molding of the pre-mounted part; and
The gas spring presses the blank holder together with the cushion pin from below to fix the base panel placed on the blank holder by the combined force of the gas spring and the cushion pin, and the continuous rise of the punch prevents the formation of the pre-mounted part. A method of manufacturing an aluminum battery case for a vehicle, comprising: a fourth step in which the production of the primary processed product is completed by completing. The method according to claim 1,
When manufacturing the base panel in the blanking processing step, the edge that adversely affects the formability during the primary drawing processing is also cut together so that the edge of the base panel is formed as an inclined surface. 3. The method according to claim 2,
The method of manufacturing an aluminum battery case for a vehicle, characterized in that the inclined surface of the base panel is formed as both edges of the portion where the preliminary mounting portion is located are cut together during the blanking process. The method according to claim 1,
In the first drawing processing step, a primary processing product having a preliminary mounting part is manufactured using an upper die, a blanking holder, a cushion pin and a gas spring, and a primary drawing mold having a punch;
When the base panel is placed on the blank holder and the lowering upper die comes into contact with the base panel placed on the blank holder, the punch rises and the production of the primary processed product having the preliminary mounting part from the base panel is completed, characterized in that A method of manufacturing an aluminum battery case for a vehicle. delete The method according to claim 1,
In the second drawing processing step, an upper case of a finished product having a first mounting part and a second mounting part is manufactured using a secondary drawing mold having an upper die, a blanking holder, a cushion pin and a gas spring, and a punch;
The upper case of the finished product having the first mounting part and the second mounting part from the secondary processed product as the descending upper die comes into contact with the secondary processed product by placing the secondary processed product that has completed the annealing processing on the blank holder and the punch. Method of manufacturing an aluminum battery case for a vehicle, characterized in that the production is completed. 7. The method of claim 6,
The second drawing processing step is,
a first step in which a secondary processed product is placed on a blanking holder and a punch in a state in which the upper die is spaced upwardly, and a gas spring is in contact with the blank holder;
a second step in which the upper die descends and comes into contact with the secondary processed product placed on the blank holder;
As the upper die continues to descend, the cushion pin contacts the blank holder, and the gas spring presses the blank holder from below to fix the secondary processed product by the force of the gas spring, and the rest of the secondary processed product except for the pre-mounted part a third step of starting molding into a first mounting part having a predetermined depth by pressing the punch; and
The cushion pin presses the blank holder together with the gas spring from the bottom to fix the secondary processed product by the combined force of the gas spring and the cushion pin. At the same time, as the pre-mounting part is molded into the second mounting part, the fourth step of manufacturing the upper case of the finished product is completed; a method of manufacturing an aluminum battery case for a vehicle, comprising: a. The method according to claim 1,
A method of manufacturing an aluminum battery case for a vehicle, characterized in that the depth of the preliminary mounting portion provided in the primary processed product is formed to be approximately 60% to 80% of the depth of the second mounting portion of the upper case, which is the final finished product. The method according to claim 1,
In the upper case of the finished product, the depth of the second mounting portion is at least 2.5 times greater than the depth of the first mounting portion.

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