KR20240047090A - Battery case - Google Patents

Abstract

A side member is provided along the edge of the lower panel where the battery is seated, extends upward to form a side wall, and is formed by a plurality of spaced fastening holes at the top. A gasket is seated at the top of the side member and is formed by a plurality of spaced through holes. And it consists of a head part and a body part with threads formed on the outer peripheral surface, the body part is inserted into the fastening hole at the top of the side member, the head part is fixed to the top of the side member through a rivet shape, and the gasket is fitted to the head part through a through hole. A battery case including a plurality of pop nut portions is introduced.

Description

Battery case {BATTERY CASE}

The present invention relates to a battery case, and more specifically, to a battery case that can maintain airtightness of the battery case by providing fixing force through a pop nut portion having a rivet shape.

Recently, interest in alternative energy sources is increasing in the automotive field due to environmental problems such as climate change, soaring oil prices, and exhaust gas regulations around the world. As an alternative to this, research is being actively conducted on electric vehicles fueled by electricity, a non-polluting and non-depletable power source.

Electric vehicles are pure electric vehicles (EV) that run by driving a drive motor, hybrid vehicles (HEV) that run by an engine and a drive motor, and drive a drive motor with power generated from a fuel cell. There are fuel cell electric vehicles (FCEV) that drive.

Such an electric vehicle includes a drive motor for driving the vehicle, as well as a battery as a power storage means for supplying power to the drive motor. For example, nickel-hydrogen and lithium-polymer batteries are used.

These batteries consist of a battery pack in which a plurality of battery modules are combined in series or parallel. And the battery pack is mounted on the electric vehicle while stored in a battery case for ease of transportation, prevention of shock from the outside, and prevention of water or oil infiltration.

The battery case includes a lower panel that accommodates the battery pack inside, a side member that extends upward along the edge of the lower panel to form a side wall, an upper panel that covers the upper part of the lower panel and covers the battery pack, and a combination of the side member and the upper panel. It includes a gasket that is compressed and sealed between the gaskets.

Battery cases vary depending on the specifications of the vehicle, but are generally manufactured in a large size to accommodate a battery pack made up of multiple battery cells, and the gasket for sealing is mainly made of rubber and is an infinite monolith that corresponds to the size of the battery case. It consists of

Accordingly, in order to mold a conventional gasket, a large mold and a curing machine are required, which has the disadvantage of increasing equipment costs.

Moreover, in order to improve the accuracy of the pressing position when pressing the gasket between the side member and the upper panel, the conventional gasket is provided with a separate insertion part inserted into the upper part of the side member, which complicates the processing process and increases the weight due to the insertion part itself. There is a rising problem.

In addition, conventionally, a separately manufactured bush is used to prevent the gasket from coming off during the delivery of the battery case after assembling the gasket and to compensate for thickness differences during assembly. However, the cost of the bush is too excessive, so the overall cost of the battery case is reduced. There is a problem where is rising.

Therefore, in order to improve the above-mentioned problems, there is an urgent need to provide a battery case that can reduce the number of parts and cost while maintaining airtightness of the battery case.

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

KR 10-2390217 B1

The present invention was proposed to solve this problem. By providing fixing force through a pop nut portion having a rivet shape, the bush applied to prevent the separation of the conventional gasket and compensate for the thickness can be deleted, thereby reducing the number of parts and cost while reducing the battery life. We aim to provide a battery case that can maintain the confidentiality of the case.

The battery case according to the present invention for achieving the above object is provided along the edge of the lower panel on which the battery is mounted, extends upward to form a side wall, and has a plurality of fastening holes spaced apart at the top, a side member, and a side member. It is seated at the top of the unit and consists of a gasket formed with a plurality of through holes spaced apart, a head part, and a body part with threads formed on the outer peripheral surface. The body part is inserted into the fastening hole at the top of the side member, and the head part is attached to the top of the side member through a rivet shape. It is fixed and includes a plurality of pop nut portions in which the gasket is fitted to the head portion through a through hole.

The pop nut portion of the battery case according to the present invention has a head portion extending upward so that the outer surface of the head portion can be in surface contact with the inner surface of the through hole of the gasket.

A locking groove is formed on the inner side of the through hole of the gasket of the battery case according to the present invention, and a locking protrusion is formed on the outer surface of the head portion of the pop nut portion toward the inner side of the through hole of the gasket. The locking protrusion is inserted into the locking groove and the head portion is formed. The outer surface and the inner surface of the through hole may be in surface contact.

The locking protrusion of the battery case according to the present invention may be provided at the top of the outer surface of the head portion.

The head part of the battery case according to the present invention has an outer diameter that expands upward, so that the outer surface forms an inclined surface, and the outer surface of the head part can be in surface contact with the inner surface of the through hole of the gasket.

The upper end of the outer surface of the head portion of the battery case according to the present invention may be formed with a vertically extending extension.

The body portion of the pop nut portion of the battery case according to the present invention is characterized in that threads are formed on the outer peripheral surface that is in contact with the inner surface of the fastening hole of the side member, and no threads are formed on the outer peripheral surface that is not in surface contact with the inner surface of the fastening hole. You can.

The portion where the thread is not formed on the outer peripheral surface of the body of the pop nut portion of the battery case according to the present invention may be deformed after the body is inserted into the fastening hole at the top of the side member to form a flange portion.

The battery case according to the present invention may further include a pop bolt portion that is inserted into the fastening hole at the bottom of the side member and fixed.

The pop bolt portion of the battery case according to the present invention is inserted into the fastening hole and is formed to penetrate the through hole of the gasket, and the gasket may be provided with a bush on the inner side of the through hole through which the pop bolt portion penetrates.

According to the battery case of the present invention, the following effects are achieved.

First, by providing fixing force through a pop nut portion having a rivet shape, the bush applied to prevent the separation of the conventional gasket and compensate for the thickness can be deleted, which has the effect of reducing the number of parts and cost.

Second, as the fixing force of the pop nut part increases, the cost reduction effect can be maximized by increasing the number of pop nuts but using fewer pop bolts than before.

Third, by applying a fitting type gasket, the insertion part previously formed separately at the top of the side member for coupling the gasket can be deleted, which has the effect of simplifying the processing process and reducing weight.

Fourth, the airtightness of the battery case can be maintained while reducing costs by increasing the fixing force of the pop nut and using a fitting gasket.

Figure 1 is a view showing the application of a bush to prevent separation of a conventional gasket and compensate for its thickness.
Figure 2 is a diagram showing the coupling relationship between the pop nut portion and the gasket according to an embodiment of the present invention.
FIG. 3 is a view showing that a locking groove is formed on the inner side of the through hole of the gasket in FIG. 2 and a locking protrusion is formed on the outer side of the head of the pop nut portion.
FIG. 4 is a view showing that the outer surface of the head portion in FIG. 2 forms an inclined surface.
Figure 5 is a view to explain how a gasket is seated on the top of the side member forming the side wall of the lower panel.
Figure 6 is a view showing a portion of the upper part of a conventional side member.
Figure 7 is a view showing a part of a conventional gasket.
Figure 8 is a view showing a portion of the upper part of a side member according to an embodiment of the present invention.
Figure 9 is a view showing a portion of a gasket according to an embodiment of the present invention.
Figure 10 is a diagram showing the coupling relationship between the pop bolt portion and the gasket according to an embodiment of the present invention.

Throughout this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are intended to indicate the presence of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. It should be understood that this does not exclude in advance the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

Specific structural and functional descriptions of the embodiments disclosed in the present specification are merely illustrative for the purpose of explaining the embodiments according to the present invention, and the embodiments according to the present invention may be implemented in various forms and are not included in the specification. It should not be construed as limited to the described embodiments.

In describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted. In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in this specification, should not be interpreted as having an ideal or excessively formal meaning. .

Hereinafter, the configuration and operating principles of various embodiments of the disclosed invention will be described in detail with reference to the attached drawings. However, regardless of the reference numerals, identical or similar components will be assigned the same reference numbers and duplicate descriptions thereof will be omitted. Do this.

Figure 1 is a diagram showing the application of a bush to prevent separation and compensate for the thickness of the conventional gasket 300, and Figure 2 shows the coupling relationship between the pop nut portion 400 and the gasket 300 according to an embodiment of the present invention. 3 is a drawing in which a locking groove 321 is formed on the inner surface of the through hole 310 of the gasket 300 in FIG. 2, and a locking protrusion (321) is formed on the outer surface of the head portion 410 of the pop nut portion 400. 421) is a view showing the formation, and Figure 4 is a view showing that the outer surface of the head portion 410 in Figure 2 forms an inclined surface, and Figure 5 is a view showing the side member 200 forming the side wall of the lower panel 100. This is a drawing to explain how the gasket 300 is seated at the top, Figure 6 is a drawing showing a part of the top of the conventional side member 200, and Figure 7 is a drawing showing a part of the conventional gasket 300, FIG. 8 is a view showing a portion of the upper part of the side member 200 according to an embodiment of the present invention, FIG. 9 is a view showing a portion of the gasket 300 according to an embodiment of the present invention, and FIG. 10 is a view showing a portion of the upper part of the side member 200 according to an embodiment of the present invention. This is a diagram showing the coupling relationship between the pop bolt portion 500 and the gasket 300 according to an embodiment of the invention.

The battery case according to the present invention includes a side member 200 that is provided along the edge of the lower panel 100 on which the battery is mounted, extends upward to form a side wall, and has a plurality of fastening holes 210 spaced apart from each other at the top, It is seated on the top of the side member 200 and consists of a gasket 300 and a head portion 410 formed with a plurality of through holes 310 spaced apart from each other, and a body portion 420 with threads formed on the outer peripheral surface, and the body portion ( 420) is inserted into the fastening hole 210 from the top of the side member 200, the head part 410 is fixed to the top of the side member 200 through a rivet shape, and the gasket 300 is inserted through the through hole 310. It includes a plurality of pop nut parts 400 fitted into the head part 410.

To help understand the present invention, with reference to FIGS. 5 to 7, let's briefly look at the structure of a conventional battery case and look at the distinctive features of the battery case according to the present invention compared to the conventional battery case.

As seen in the background technology, a typical battery case includes a lower panel 100 that accommodates the battery pack inside, a side member 200 that extends upward along the edge of the lower panel 100 to form a side wall, and a lower panel ( 100) and includes an upper panel covering the battery pack and a gasket 300 that is pressed and sealed between the side member 200 and the upper panel.

Accordingly, the battery case according to the present invention includes a side member 200 that is provided along the edge of the lower panel 100 on which the battery is mounted and extends upward to form the side wall, and a gasket mounted on the top of the side member 200. (300) is taken as the basic component.

Figure 5 shows the lower panel 100, side member 200, and gasket 300 excluding the upper panel. As shown in FIG. 5, the gasket 300 is manufactured in a size corresponding to the size of the battery case. Therefore, in order to mold the conventional gasket 300, a large mold and a curing machine are required, which has the disadvantage of increasing equipment costs.

In addition, in order to improve the accuracy of the pressing position when pressing the gasket 300 between the side member 200 and the upper panel, the conventional gasket 300 has a separate insertion part (I) inserted into the upper part of the side member 200. ) is prepared.

In relation to this, let's look at it in more detail with reference to FIGS. 6 and 7, which show enlarged areas D of FIG. 5. In FIG. 7, I refers to an insertion portion (I) provided separately to improve the compression position accuracy of the gasket 300, and this insertion portion (I) is an insertion hole (G) formed at the top of the side member 200 in FIG. 6. It is inserted into and fixes the compression position of the gasket 300.

Accordingly, a separate process is required to form the insertion portion (I) in the gasket 300, which makes the processing process complicated, and there is a problem that the overall weight of the gasket 300 increases due to the insertion portion (I) itself. .

Accordingly, the invention disclosed in this specification provides a battery case that simplifies the processing process and reduces the weight by eliminating the insertion portion (I) of the gasket 300 and the insertion hole (G) formed at the top of the side member 200. I want to do it.

That is, the battery case according to the present invention is configured to accurately fix the position of the gasket 300 even if the insertion portion (I) formed in the conventional gasket 300 is deleted by applying the gasket 300 of the fitting type. .

Specifically, as shown in FIGS. 8 and 9, a plurality of fastening holes 210 are formed at a distance from each other at the top of the side member 200 according to the present invention, and a plurality of through holes 310 are formed in the gasket 300. ) are formed by being spaced apart. And the battery case according to the present invention is configured to further include a pop nut portion 400 that is inserted into the fastening hole 210 at the top of the side member 200 and provides fixing force.

The pop nut portion 400 consists of a head portion 410 having a rivet shape and a body portion 420 with threads formed on the outer peripheral surface. The body portion 420 is connected to the fastening hole 210 at the top of the side member 200. It is inserted, and the head portion 410 is fixed to the top of the side member 200 through a rivet shape. And, since the gasket 300 is fitted into the head portion 410 through the through hole 310, the position of the gasket 300 can be accurately fixed.

Meanwhile, the pop nut portion 400 of the battery case according to the present invention has a head portion 410 extending upward so that the outer surface of the head portion 410 is connected to the inner surface of the through hole 310 of the gasket 300. may be contacted.

As shown in FIG. 1, the conventional battery case includes a separately manufactured bush ( A) was used.

Here, 'thickness difference during assembly' refers to the difference in thickness between the gasket 300 and the pop nut portion 400 when assembling the gasket 300. If this thickness difference is not compensated, the airtightness of the battery case is reduced. Therefore, the conventional battery case had no choice but to include a separately manufactured bush (A).

However, the conventional separately manufactured bush A has a problem in that the overall cost of the battery case increases because the cost is too excessive.

Therefore, the pop nut portion 400 of the battery case according to the present invention extends the head portion 410 upward as shown in FIG. 2, so that the above-described thickness can be achieved without applying the conventionally separately manufactured bush A. There is an advantage in compensating for the difference.

Furthermore, since the outer surface of the upwardly extending head part 410 is in surface contact with the inner surface of the through hole 310 of the gasket 300, there is a space between the outer surface of the head part 410 and the inner surface of the through hole 310. There is an effect that the gasket 300, which is coupled by the fitting method by the friction force, can be fixed more stably.

Meanwhile, a locking groove 321 is formed on the inner side of the through hole 310 of the gasket 300 of the battery case according to the present invention, and the gasket 300 is formed on the outer side of the head portion 410 of the pop nut portion 400. A locking protrusion 421 is formed facing the inner surface of the through hole 310, and the locking protrusion 421 is inserted into the locking groove 321, thereby forming an outer surface of the head portion 410 and an inner surface of the through hole 310. This side can be touched.

Specifically, referring to FIG. 3, a recessed locking groove 321 is formed on the inner surface of the through hole 310 of the gasket 300, and the gasket is formed on the outer surface of the head portion 410 of the pop nut portion 400. A locking protrusion 421 is formed facing the inner surface of the through hole 310 of (300), and the locking protrusion 421 is inserted into the locking groove 321, thereby connecting the outer surface of the head portion 410 and the through hole 310. It can be seen that the inner surface of is in surface contact.

As shown in Figure 2, when the outer surface of the head part 410 and the inner surface of the through hole 310 are simply in surface contact, between the outer surface of the head part 410 and the inner surface of the through hole 310 Despite the friction force, there is a possibility that the gasket 300 may be separated upward.

The battery case according to the present invention has a locking groove 321 formed on the inner side of the through hole 310 of the gasket 300, and a locking protrusion 421 on the outer side of the head portion 410 of the pop nut portion 400. By forming and inserting the locking protrusion 421 into the locking groove 321, it is intended to more reliably prevent the gasket 300 from coming off.

That is, even if the gasket 300 receives an external force upward, a reaction force is formed by the stopping protrusion 421 in addition to the frictional force between the outer surface of the head portion 410 and the inner surface of the through hole 310, thereby forming the gasket 300. It is possible to effectively prevent the gasket 300 from being separated during delivery of the battery case after assembly.

At this time, the locking protrusion 421 of the battery case according to the present invention may be provided at the top of the outer surface of the head portion 410.

In the present invention, the locking protrusion 421 is configured to more effectively prevent the gasket 300 from moving upward. Therefore, the stopping protrusion 421 is preferably provided at the top of the outer surface of the head portion 410, as shown in FIG. 2.

In this way, when the locking protrusion 421 is provided at the top of the outer surface of the head portion 410, the locking protrusion 421 presses the gasket 300 from the top to the bottom, so that a predetermined pressing force is applied to the gasket 300. , the locking groove 321 formed on the inner surface of the through hole 310 of the gasket 300 described above may be omitted.

Meanwhile, the head portion 410 of the battery case according to the present invention has an outer diameter that expands upward, forming an inclined surface on the outer surface, and the outer surface of the head portion 410 is the inner surface of the through hole 310 of the gasket 300. may come into contact with the surface.

Specifically, referring to FIG. 4 , it can be seen that a slope is formed in region C where the outer surface of the head portion 410 and the inner surface of the through hole 310 of the gasket 300 are in surface contact.

This is preferably understood as a structure for preventing the gasket 300 from moving upward, as in the case where the locking groove 321 and the locking protrusion 421 are formed (hereinafter referred to as 'first embodiment'). .

That is, as shown in FIG. 2, when the outer surface of the head part 410 and the inner surface of the through hole 310 are simply in surface contact, the outer surface of the head part 410 and the inner surface of the through hole 310 Despite the friction between the sides, there is a possibility that the gasket 300 may come off upward.

The battery case according to the present invention is intended to more reliably prevent the gasket 300 from coming off by forming an inclined surface on the outer surface of the head portion 410 so that the outer diameter of the head portion 410 expands from downward to upward. .

That is, even if the gasket 300 receives an external force upward, a predetermined reaction force is formed by the inclined surface formed so that the outer diameter of the head portion 410 expands from the bottom to the top, so that the battery case is delivered after the gasket 300 is assembled. It is possible to effectively prevent the gasket 300 from being separated during the process.

At this time, a vertically extending extension portion 411 may be formed at the upper end of the outer surface of the head portion 410 of the battery case according to the present invention.

Even if an inclined surface is formed on the outer surface of the head part 410, if the entire outer surface is formed as an inclined surface, the static friction coefficient (refers to the static friction coefficient between the outer surface of the head part 410 and the inner surface of the gasket 300). If the above external force acts on the gasket 300, slippage may occur and the gasket 300 may deviate upward.

Therefore, the battery case according to the present invention is provided with an extension part 411 extending vertically at the top of the outer surface of the head part 410, as shown in area C of FIG. 4, to more effectively prevent the gasket 300 from moving upward. It can be prevented.

Additionally, compared to the first embodiment, forming an inclined surface on the head portion 410 can simplify the processing process, thereby reducing manufacturing costs.

Meanwhile, the body portion 420 of the pop nut portion 400 of the battery case according to the present invention has threads formed on the outer peripheral surface in contact with the inner surface of the fastening hole 210 of the side member 200, and the fastening hole 210 ) It may be characterized in that no threads are formed on the outer peripheral surface that is not in contact with the inner surface.

Here, the outer peripheral surface in contact with the inner surface of the fastening hole 210 of the side member 200 refers to area B in FIGS. 2 to 4. And the outer peripheral surface that is not in contact with the inner surface of the fastening hole 210 refers to the outer peripheral surface excluding area B of the body portion 420 of the pop nut portion 400.

At this time, of course, separate threads formed to correspond and engage with the threads of the body portion 420 may be formed on the inner surface of the fastening hole 210 of the side member 200.

That is, the thread of the body portion 420 is engaged with a separate thread formed on the inner surface of the fastening hole 210 of the side member 200, so that the pop nut portion 400 can be fixed to the side member 200. It will happen.

Furthermore, the non-threaded portion of the outer peripheral surface of the body portion 420 of the pop nut portion 400 of the battery case according to the present invention is inserted into the fastening hole 210 at the top of the side member 200. After being deformed, the flange portion 422 may be formed.

Specifically, as shown in FIGS. 2 to 4 , the flange portion 422 may be formed by folding a portion of the non-threaded portion of the outer peripheral surface of the body portion 420 of the pop nut portion 400. At this time, it is preferable to understand that the part forming the flange part 422 refers to the upper part of the part on the outer peripheral surface of the body part 420 of the pop nut part 400 that does not have threads.

And the outer peripheral surface of the body portion 420 of the pop nut portion 400 forming the flange portion 422 is deformed by the rotational force of the fastening tool used when fastening the pop nut portion 400 to form the flange portion 422. can do. Since the formation of the flange portion 422 according to the rotational force of the fastening tool is self-evident in the technical field of the present invention, detailed description thereof will be omitted.

Ultimately, after the body portion 420 of the pop nut portion 400 is inserted into the fastening hole 210 at the top of the side member 200, threads are not formed on the outer peripheral surface of the body portion 420 of the pop nut portion 400. Some of the parts (particularly the upper part) that are not exposed are deformed to form the flange part 422, which has the effect of allowing the pop nut part 400 to be more stably fixed to the side member 200.

Meanwhile, the battery case according to the present invention may further include a pop bolt portion 500 that is inserted into and fixed to the fastening hole 210 at the bottom of the side member 200.

In this regard, let's look at it in detail with reference to FIGS. 6 to 10.

First, in FIG. 6, both the E area and the F area refer to the fastening hole 210 formed at the top of the side member 200 in the conventional battery case, and in the E area, the pop bolt portion 500 is connected to the side member 200. It is shown inserted into the fastening hole 210 at the bottom.

Additionally, area H in FIG. 7 refers to a through hole 310 formed in the gasket 300 in a conventional battery case.

And the J area in FIG. 8 corresponds to the E area in FIG. 6, showing that the pop bolt portion 500 is inserted into the fastening hole 210 at the bottom of the side member 200 in the battery case according to the present invention. .

In addition, Figure 9 shows the through hole 310 into which the pop nut part 400 of the battery case according to the present invention is inserted and the through hole 310 into which the pop bolt part 500 is inserted.

When only the pop nut portion 400 is used for coupling with the side member 200, the coupling direction of the pop nut portion 400 is formed only downward from the top of the side member 200, which may cause the nut to loosen. You can. Therefore, the battery case according to the present invention is intended to prevent nut loosening by further including a pop bolt portion 500 coupled in the opposite direction to the pop nut portion 400.

In addition, as described above, the pop nut portion 400 of the battery case according to the present invention has improved fixing force compared to the pop nut portion 400 applied to the conventional battery case, allowing the use of fewer pop bolts than before. There will be.

Since the cost of pop bolts is generally higher than that of pop nuts, reducing the number of pop bolts applied as above has the advantage of further maximizing the cost reduction effect.

At this time, referring to FIG. 10, the pop bolt portion 500 of the battery case according to the present invention is inserted into the fastening hole 210 and is formed to penetrate the through hole 310 of the gasket 300, and the gasket 300 A bush 510 may be provided on the inner surface of the through hole 310 through which the pop bolt portion 500 passes.

The pop bolt portion 500 of the battery case according to the present invention, unlike the pop nut portion 400, is inserted into the fastening hole 210 at the bottom of the side member 200, so the gasket 300 and the pop bolt portion 500 ), there is bound to be a difference in thickness. As previously explained in relation to the difference in thickness between the gasket 300 and the pop nut portion 400, if this thickness difference is not compensated, there is a problem that the airtightness of the battery case is deteriorated.

Therefore, the gasket 300 of the battery case according to the present invention includes a bush 510 on the inner surface of the through hole 310 through which the pop bolt portion 500 penetrates, thereby compensating for the above-described thickness difference and at the same time preventing the pop. This is to ensure that the bolt portion 500 and the gasket 300 are fixed more stably.

Accordingly, there is an effect of improving the airtightness of the battery case while using the minimum number of pop bolt portions 500.

Therefore, as described above, according to the battery case of the present invention, the bush 510 applied to prevent separation of the conventional gasket 300 and compensate for the thickness can be deleted by providing fixing force through the pop nut portion 400 having a rivet shape. The number of parts and cost can be reduced, and as the fixing force of the pop nut part 400 increases, the number of pop nuts can be increased, but the cost reduction effect can be further maximized by using fewer pop bolts than before. there is.

In addition, by applying the gasket 300 of the fitting type, it is possible to delete the insertion part separately formed at the top of the conventional side member 200 for coupling the gasket 300, which has the effect of simplifying the processing process and reducing weight. .

Ultimately, there is an advantage of maintaining the airtightness of the battery case while reducing costs through increased fixing force of the pop nut portion 400 and the gasket 300 of the fitting type.

Although the invention has been shown and described in relation to specific embodiments, it is commonly known in the art that the present invention can be modified and changed in various ways without departing from the technical spirit of the invention as provided by the following claims. It will be self-evident to those with knowledge.

100: lower panel
200: side member
210: fastening hole
300: gasket
310: Through hole
321: Locking groove
400: Pop nut part
410: head part
411: extension part
420: body part
421: Obstacle
422: Flange part
500: Pop bolt part
510: Bush

Claims (10)

A side member is provided along the edge of the lower panel on which the battery is seated, extends upward to form a side wall, and has a plurality of fastening holes spaced apart from each other at the top;
A gasket seated on the top of the side member and formed with a plurality of spaced through holes; and
It consists of a head part and a body part with threads formed on the outer peripheral surface, the body part is inserted into a fastening hole at the top of the side member, the head part is fixed to the top of the side member through a rivet shape, and a gasket is fitted to the head part through a through hole. A battery case including a pop nut portion of.
In claim 1,
The pop nut portion is a battery case characterized in that the head portion extends upward so that the outer surface of the head portion is in surface contact with the inner surface of the through hole of the gasket.
In claim 1,
A locking groove is formed on the inner side of the through hole of the gasket,
A locking protrusion is formed on the outer surface of the head of the pop nut portion, which faces the inner surface of the through hole of the gasket.
A battery case characterized in that the outer surface of the head portion and the inner surface of the through hole come into surface contact as the locking protrusion is inserted into the locking groove.
In claim 3,
A battery case characterized in that the locking protrusion is provided at the top of the outer surface of the head.
In claim 1,
The outer diameter of the head expands upward, forming a slope on the outer surface.
A battery case characterized in that the outer surface of the head part is in surface contact with the inner surface of the through hole of the gasket.
In claim 5,
A battery case characterized in that the upper part of the outer surface of the head is formed with a vertically extending extension.
In claim 1,
A battery case characterized in that the body part of the pop nut portion has threads formed on the outer circumferential surface that is in contact with the inner surface of the fastening hole of the side member, and that no screw threads are formed on the outer circumferential surface that is not in contact with the inner surface of the fastening hole.
In claim 7,
A battery case wherein the unthreaded portion of the outer peripheral surface of the body of the pop nut portion is deformed after the body portion is inserted into the fastening hole at the top of the side member to form a flange portion.
In claim 1,
A battery case characterized in that it further includes a pop bolt portion that is inserted and fixed into the fastening hole at the bottom of the side member.
In claim 9,
The pop bolt portion is inserted into the fastening hole and is formed to penetrate the through hole of the gasket,
The gasket is a battery case characterized by a bush provided on the inner side of the through hole through which the pop bolt part passes.