KR102645896B1 - Case of battery pack for electric vehicle - Google Patents

Abstract

An invention relating to a battery pack case for an electric vehicle is disclosed. The battery pack case for an electric vehicle according to the present invention includes: a support portion that guides coolant and on which the battery pack is seated; A first supply unit coupled to one end of the support and communicating with the support to supply cooling water; A first discharge part coupled to the other end of the support and discharging coolant that has passed through the support; a second supply unit coupled to the first discharge unit and communicating with the support unit to supply cooling water; and a second discharge portion coupled to the first supply portion in communication and discharging the coolant that has passed through the support portion.

Description

Battery pack case for electric vehicles {CASE OF BATTERY PACK FOR ELECTRIC VEHICLE}

The present invention relates to a battery pack case for an electric vehicle, and more specifically, to a battery pack case for an electric vehicle that maintains constant flatness, maintains uniform contact with the battery pack, and improves cooling efficiency. .

A battery pack as an energy storage device is composed of multiple battery cells connected in series or parallel, and due to its portable nature, it is widely used in electric bicycles, electric scooters, outdoor LED lighting, mobile phone charging, laptop charging, and various home appliances. It can be used as a power supply device for and can also be used in electric vehicles. These battery packs are stored and protected in a case.

Recently, lithium batteries have been mainly used as batteries included in battery packs as energy storage devices. Lithium batteries include lithium ion batteries that use liquid electrolytes and lithium polymer batteries that use solid polymers.

A battery pack is used by connecting multiple lithium-ion batteries in series or parallel to form a module. The battery pack has a structure in which a PCB board containing a battery cell and a protection circuit module (PCM) is combined. It consists of

Meanwhile, the case made of metal has a frame with ribs formed inside to maintain rigidity, but since this frame is difficult to bend, a plurality of frames are welded to cover the battery pack.

However, in the related art, there is a problem in that the case and the battery pack are not uniformly in surface contact due to poor flatness of the case. Additionally, since the coolant moving through the flow path formed in the case does not exchange heat evenly with the battery pack, there is a problem in that uniform cooling of the battery pack is not achieved. Therefore, there is a need to improve this.

The background technology of the present invention is published in Republic of Korea Patent Publication No. 10-1957161 (registered on March 6, 2019, title of invention: Battery cooling system for electric vehicle).

This invention was applied for through the project funds for the project "Development of a 55 kWh battery pack lower case with opposing cooling panels for mounting on an EV-specific chassis platform" in the "Yeongcheon City Future Car Parts Conversion Company R&D Cooperation Project."

The present invention was devised to improve the above problems. The purpose of the present invention is to maintain the flatness of the battery pack case for an electric vehicle so that contact with the battery pack is maintained uniformly and cooling efficiency is improved. is to provide.

The battery pack case for an electric vehicle according to the present invention includes: a support portion that guides coolant and on which the battery pack is seated; a first supply unit coupled to one end of the support unit and communicating with the support unit to supply cooling water; a first discharge portion coupled to the other end of the pedestal and discharging coolant that has passed through the pedestal; a second supply unit coupled to the first discharge unit and communicating with the support unit to supply cooling water; and a second discharge portion coupled to the first supply portion in communication and discharging the coolant that has passed through the support portion.

In the present invention, at least one of the support part, the first supply part, the first discharge part, the second supply part, and the second discharge part is extrusion molded.

In the present invention, any one or more of the support part, the first supply part, the first discharge part, the second supply part, and the second discharge part are subjected to one or more of friction stir welding, braze welding, laser welding, and adhesive. are combined by

In the present invention, the support portion includes a support top portion on which the battery pack is mounted; a lower support plate disposed below the upper support plate; and a plurality of supporting partition walls that connect the supporting upper plate and the lower supporting plate and are arranged to be spaced apart to induce linear movement of the coolant.

In the present invention, the support portion includes a support extension portion extending from both ends of the support top plate portion; And a lower pedestal extension part extending from both ends of the lower pedestal plate; wherein the first supply part and the first discharge part are inserted between the pedestal upper extension part and the lower pedestal extension part.

In the present invention, the support portion is molded integrally with the support top plate portion, and further includes a support bracket portion to which the battery pack is assembled.

In the present invention, at least one of the first supply part and the first discharge part includes a first body part disposed at an end of the support part; a first main flow path formed in the longitudinal direction of the first body portion through which coolant passes; a first insertion portion extending from the first body portion and inserted into the support portion; and a plurality of first connection passage portions formed in the longitudinal direction of the first insertion portion and communicating with the first main passage portion and the support portion.

In the present invention, at least one of the second supply part and the second discharge part includes a second body part disposed at an end of the first body part; a second main passage portion formed in the longitudinal direction of the second body portion through which coolant passes; and a plurality of second connection passage portions formed in the longitudinal direction of the second body portion and communicating with the first body portion to communicate with the second main passage portion and the support portion.

In the present invention, the first main flow passage parts and the second main flow passage parts are arranged alternately.

In the present invention, at least one of the second supply part and the second discharge part further includes a side frame part molded integrally with the second body part.

In the battery pack case for an electric vehicle according to the present invention, the battery pack is in uniform surface contact with the base, and coolant flows through the first supply part, first discharge part, second supply part, and second discharge part coupled to both ends of the base. The battery pack can be cooled evenly by passing through the base against each other.

1 is a perspective view schematically showing a battery pack case for an electric vehicle according to an embodiment of the present invention.
Figure 2 is a plan view schematically showing a battery pack case for an electric vehicle according to an embodiment of the present invention.
Figure 3 is a perspective view schematically showing a support portion according to an embodiment of the present invention.
Figure 4 is a cross-sectional view schematically showing a support portion according to an embodiment of the present invention.
Figure 5 is a side view schematically showing a support portion according to an embodiment of the present invention.
Figure 6 is a cross-sectional view schematically showing a state in which the support bracket portion is formed integrally with the support portion according to an embodiment of the present invention.
Figure 7 is a perspective view schematically showing a first supply unit and a second discharge unit or a second supply unit and a first discharge unit according to an embodiment of the present invention.
Figure 8 is a side view schematically showing a first supply unit and a second discharge unit or a second supply unit and a first discharge unit according to an embodiment of the present invention.
Figure 9 is a cross-sectional view schematically showing a support portion of the first supply unit and the second discharge unit or the second supply unit and the first discharge unit according to an embodiment of the present invention.
Figure 10 is a front view schematically showing a state in which the side frame portion is formed integrally with the second supply portion or the second discharge portion according to an embodiment of the present invention.

Hereinafter, an embodiment of a battery pack case for an electric vehicle according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or sizes of components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

Figure 1 is a perspective view schematically showing a battery pack case for an electric vehicle according to an embodiment of the present invention, Figure 2 is a plan view schematically showing a battery pack case for an electric vehicle according to an embodiment of the present invention, and Figure 3 is a perspective view schematically showing a support unit according to an embodiment of the present invention, Figure 4 is a cross-sectional view schematically showing a support unit according to an embodiment of the present invention, and Figure 5 is a schematic view of a support unit according to an embodiment of the present invention. It is a side view shown, and Figure 6 is a cross-sectional view schematically showing the state in which the support bracket part is formed integrally with the support part according to an embodiment of the present invention, and Figure 7 is a first supply part and a second supply part according to an embodiment of the present invention. It is a perspective view schematically showing the discharge part or the second supply part and the first discharge part, and Figure 8 is a side view schematically showing the first supply part and the second discharge part or the second supply part and the first discharge part according to an embodiment of the present invention. , Figure 9 is a cross-sectional view schematically showing the support of the first supply unit and the second discharge unit or the second supply unit and the first discharge unit according to an embodiment of the present invention, and Fig. 10 is a cross-sectional view schematically showing the support portion of the first supply unit and the second discharge unit according to an embodiment of the present invention. This is a front view schematically showing the side frame part formed integrally with the supply part or the second discharge part.

Referring to Figures 1 and 2, the battery pack case for an electric vehicle according to an embodiment of the present invention includes a support part 10, a first supply part 20, a first discharge part 30, and a second supply part 40. ), and a second discharge unit 50.

The support portion 10 guides the coolant, and the battery pack 100 is seated. For example, the battery pack 100 is seated on the upper side of the support unit 10 and makes surface contact, and a flow path for guiding coolant may be formed inside the support unit 10. The support unit 10 can move coolant flowing into one end in a straight line to the other end. 1 and 2 show that the battery pack 100 is disposed on a portion of the upper side of the holder 10, but the battery pack 100 may be disposed on the entire upper side of the holder 10.

The first supply unit 20 is coupled to one end (left end in Figure 1) of the support unit 10 and communicates with the support unit 10 to supply cooling water. Cooling water flowing into the first supply unit 20 may move into the interior of the support unit 10. The first water supply unit 110 is connected to the first supply unit 20 to provide cooling water to the first supply unit 20.

The first discharge part 30 is coupled to the other end (right end in Figure 1) of the support part 10 and discharges the coolant that has passed through the support part 10. A first recovery unit 120 that recovers coolant heated by heat exchange with the battery pack 100 may be connected to the first discharge unit 30. The cooling water flowing into the first recovery unit 120 may be re-cooled and then moved to the first water supply unit 110.

The second supply part 40 is connected to the first discharge part 30 and communicates with the support part 10 to supply cooling water. Cooling water flowing into the second supply part 40 may pass through the first communicating discharge part 30 and move into the interior of the support part 10 . The second water supply unit 130 is connected to the second supply unit 40 to provide cooling water to the second supply unit 40.

The second discharge part 50 is coupled in communication with the first supply part 20 and communicates with the support part 10 to discharge the coolant that has passed through the support part 10. A second recovery unit 140 that recovers coolant heated by heat exchange with the battery pack 100 may be connected to the second discharge unit 50. The cooling water flowing into the second recovery unit 140 may be re-cooled and then moved to the second water supply unit 130.

As described above, the first supply part 20 and the second supply part 40, the first discharge part 30 and the second discharge part 50 are opposed to each other with respect to the support part 10. ), the coolant can flow in a counter flow within the support portion 10. Therefore, the cooling efficiency of the battery pack 100 can be improved compared to when the coolant flows in one direction.

At least one of the support portion 10, the first supply portion 20, the first discharge portion 30, the second supply portion 40, and the second discharge portion 50 is extrusion molded. The support portion 10 is extruded so that both ends are open to allow cooling water to move, and the sides of the multiple support portions 10 may be connected to each other. The first supply part 20, the first discharge part 30, the second supply part 40, and the second discharge part 50 are extrusion molded to have a length corresponding to the length where the side surfaces of the plurality of support parts 10 are connected. It can be.

At least one of the support portion 10, the first supply portion 20, the first discharge portion 30, the second supply portion 40, and the second discharge portion 50 is subjected to friction stir welding, braze welding, or laser welding. , may be joined by any one or more of adhesives.

Friction stir welding uses friction heat to form one of the support parts (10), the first supply part (20), the first discharge part (30), the second supply part (40), and the second discharge part (50). Combine one or more of them.

Braze welding, like melt welding, includes a grooved support portion (10), a first supply portion (20), a first discharge portion (30), a second supply portion (40), and a second discharge portion (50). One or more joints are filled with molten insert metal and joined by brazing.

LASER welding uses the output of a laser beam to weld the support part 10, the first supply part 20, the first discharge part 30, the second supply part 40, and the second discharge part 50. One or more of them is joined by welding.

The adhesive uses liquid or solid epoxy resin, phenol resin, etc. to form the support part 10, the first supply part 20, the first discharge part 30, the second supply part 40, and the second discharge part 50. ) Join one or more of the following.

The plurality of support portions 10 may be joined to each other by friction stir welding. The support portion 10 and the first supply portion 20 may be joined to each other by one or more of friction stir welding, braze welding, laser welding, and adhesive. The support portion 10 and the first discharge portion 30 may be joined to each other by one or more of friction stir welding, braze welding, laser welding, and adhesive. The first supply unit 20 and the second discharge unit 50 may be joined to each other by one or more of friction stir welding, braze welding, laser welding, and adhesive. The first discharge part 30 and the second supply part 40 may be joined to each other by one or more of friction stir welding, braze welding, laser welding, and adhesive.

In addition, the laser welding method can be additionally applied to areas joined by the friction stir welding method, and two or more joining methods can be used together as needed.

Referring to Figures 3 to 5, the support portion 10 according to an embodiment of the present invention includes a support upper plate portion 11, a support lower plate portion 12, and a support partition wall portion 13. When the support portion 10 is extruded, the upper support plate 11, the lower plate 12, and the support partition 13 are integrally molded.

The battery pack 100 is seated on the support top portion 11. When the pedestal top portion 11 is extruded, it maintains flatness, so the space between the bottom of the battery pack 100 and the pedestal top portion 11 disappears and surface contact occurs, thereby enabling uniform cooling of the battery pack 100. .

The support lower plate part 12 is disposed below the support upper plate part 11, and the support partition wall 13 connects the support upper plate part 11 and the support lower plate part 12. A plurality of supporting partition walls 13 are arranged to be spaced apart to induce straight movement of the coolant.

The support portion 10 has a shape in which one end and the other end are open, and the support partition 13 may be formed to have a length from one end to the other end of the support portion 10. Because of this, the coolant can be moved across the battery pack 100. Cooling water passing through the pedestal portion 10 can exchange heat with the entire area of the pedestal top portion 11, so cooling efficiency can be improved.

The support unit 10 may further include a support upper extension part 14 and a lower support extension part 15. The pedestal extension 14 may extend from both ends of the pedestal upper plate 11, and the pedestal lower extension 15 may extend from both ends of the pedestal lower plate 12. The pedestal extension part 14 and the pedestal lower extension part 15 are arranged to face each other, and the first supply part 20 and the first discharge part 30 are inserted between the pedestal upper extension part 14 and the pedestal lower extension part 15. do.

Referring to FIG. 6, the support unit 10 according to an embodiment of the present invention may further include a support bracket unit 16. The support bracket portion 16 is molded integrally with the support top plate portion 11, and the battery pack 100 is assembled. For example, the support bracket portion 16 may be extruded and protrude upward from the support top plate portion 11. A hole that can be assembled with the battery pack 100 may be formed in the support top portion 11.

Referring to Figures 7 to 9, at least one of the first supply part 20 and the first discharge part 30 according to an embodiment of the present invention includes a first body part 61 and a first main flow passage part ( 62), a first insertion portion 63, and a first connection passage portion 64. The first supply part 20 and the first discharge part 30 have the same shape, and the part through which the coolant is supplied to the support part 10 becomes the first supply part 20, and the coolant heat exchanged with the support part 10 The part from which the is discharged may be the first discharge portion 30.

The first body portion 61 is disposed at the end of the support portion 10. The first body portion 61 may be in contact with the ends of the pedestal upper extension portion 14 and the lower pedestal extension portion 15. The first body portion 61 may be extruded to have a length along the ends of the plurality of connected support portions 10.

The first main passage portion 62 is formed in the longitudinal direction of the first body portion 61 through which coolant passes. The first main flow path portion 62 may be formed inside the first body portion 61 by extrusion molding. A nozzle that allows coolant to enter and exit may be mounted on one end of the first main passage portion 62, and a cock that restricts coolant in and out may be mounted on the other end of the first main passage portion 62.

The first insertion portion 63 extends from the first body portion 61 and is inserted into the support portion 10. The first insertion portion 63 may protrude from one side of the first body portion 61 and be inserted between the upper extension portion 14 and the lower extension portion 15. The first insertion portion 63 may be welded to the pedestal upper extension portion 14 and the pedestal lower extension portion 15. The first insertion portion 63 may be in surface contact with the support partition wall portion 13.

A plurality of first connection passage portions 64 are formed in the longitudinal direction of the first insertion portion 63, and communicate with the first main passage portion 62 and the support portion 10. The first connection passage portion 64 may be formed by machining a hole from the end of the first insertion portion 63 toward the first body portion 61. The first connection passage portion 64 may communicate with a passage inside the support portion 10 partitioned by the support partition wall portion 13.

At least one of the second supply part 40 and the second discharge part 50 according to an embodiment of the present invention includes a second body part 71, a second main flow path part 72, and a second connection flow path part. It may include (74). The second supply part 40 and the second discharge part 50 have the same shape, and the part through which the coolant is supplied to the support part 10 becomes the second supply part 40, and the coolant heat exchanged with the support part 10 The part from which the is discharged may be the second discharge portion 50.

The second body portion 71 is disposed at an end of the first body portion 61. The second body portion 71 may be in contact with the ends of the upper extension portion 14 and the lower extension portion 15 or the end of the first body portion 61. The second body portion 71 may be extruded to have a length along the ends of the plurality of connected first body portions 61.

The second main flow path portion 72 is formed in the longitudinal direction of the second body portion 71 through which coolant passes. The second main flow path portion 72 may be formed inside the second body portion 71 by extrusion molding. A nozzle that allows coolant to enter and exit may be mounted on one end of the second main passage portion 72, and a cock that restricts coolant in and out may be mounted on the other end of the second main passage portion 72.

The second connection passage portion 74 is formed in plural numbers in the longitudinal direction of the second body portion 71, and communicates with the first body portion 61 to connect the second main passage portion 72 and the support portion 10. Let it communicate. The second connection passage portion 74 may be formed by machining a hole in the direction of the first body portion 61. The second connection passage portion 74 may communicate with a passage inside the support portion 10 partitioned by the support partition wall portion 13.

The first main flow passage portion 62 and the second main flow passage portion 72 are arranged alternately. That is, the first main flow passage part 62 and the second main flow passage part 72 are formed to be staggered, so that the first main flow passage part 62 and the second main flow passage part 72 do not mix with each other, but flow in opposite directions. .

Referring to FIG. 10, at least one of the second supply unit 40 and the second discharge unit 50 according to an embodiment of the present invention may further include a side frame unit 80. The side frame portion 80 may be molded integrally with the second body portion 71. The side frame portion 80 is formed integrally with the second body portion 71 by extrusion molding, and protrudes upward from the second body portion 71 to cover the side portion of the battery pack 100. The side frame portion 80 may be combined with a cover that covers the top of the battery pack 100.

The manufacturing process of the battery pack case for an electric vehicle according to an embodiment of the present invention having the above structure will be described as follows.

The support part 10, the first supply part 20, the first discharge part 30, the second supply part 40, and the second discharge part 50 are manufactured by extrusion molding. At this time, the support portion 10 is manufactured integrally with the support top plate 11, the support lower plate 12, and the support partition 13, and one end of the support part 10 is formed by the support partition 13. Cooling water is divided and moved from one end to the other. One or more support units 10 may be connected depending on the size of the battery pack case for an electric vehicle.

A pedestal extension 14 is formed at the end of the pedestal upper plate 11, and a pedestal lower extension 15 is formed at the end of the pedestal lower plate 12, and the pedestal upper extension 14 and the pedestal lower extension 15 are formed. Insert the first supply part 20 and the first discharge part 30 between them.

The first supply part 20 and the first discharge part 30 can be manufactured in the same shape, and the first main flow path part 62 is formed in the first body part 61, and the first main flow path part 62 is formed in the first body part 61. The insertion portion 43, which protrudes to one side and is inserted between the pedestal extension 14 and the pedestal lower extension 15, has a first connection passage portion 64 that communicates with the first main passage portion 62 through hole processing. is formed At this time, the first insertion portion 63 may be coupled to the pedestal extension portion 14 and the pedestal lower extension portion 15 by friction stir welding or the like.

The second supply part 40 and the second discharge part 50 can be manufactured in the same shape, and are coupled to the first discharge part 30 and the first supply part 20, respectively. A second main passage part 72 is formed in the second body part 71, and protrudes from the second body part 71 to one side between the upper extension part 14 and the lower extension part 15 or between the first body part 71. A second connection passage portion 74 communicating with the second main passage portion 72 is formed in the portion 61 through hole processing. At this time, the second supply unit 40 and the second discharge unit 50 may be coupled to the first discharge unit 30 and the first supply unit 20, respectively, by friction stir welding or the like.

When the above assembly is completed, the coolant is moved to the first main passage part 62 of the first supply part 20 or the second main flow passage part 72 of the second supply part 40, and then to the first main flow passage part 72 of the second supply part 40. (62) or a plurality of first connection passage portions 64 and second connection passage portions 74 connected in the longitudinal direction of the second main passage portion 72 and partitioned by the support partition 13. While passing through the support portion 10, the battery pack 100 is uniformly cooled.

The coolant heat-exchanged while passing through the support portion 10 passes through the first connection passage portion 64 of the first discharge portion 30 or the second connection passage portion 74 of the second discharge portion 50. It is discharged to the outside through the first main flow passage part 62 or the second main flow passage part 72.

The battery pack case for an electric vehicle according to an embodiment of the present invention includes a battery pack 100 in uniform surface contact with the base 10, a first supply unit 20 coupled to both ends of the base 10, and a first supply unit 20 coupled to both ends of the base 10. The battery pack 100 can be cooled evenly while coolant passes through the support portion 10 in opposite directions through the first discharge portion 30, the second supply portion 40, and the second discharge portion 50.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those skilled in the art will recognize that various modifications and other equivalent embodiments are possible therefrom. You will understand. Therefore, the true technical protection scope of the present invention should be determined by the scope of the patent claims below.

10: support part 11: support top part
12: support lower plate part 13: support bulkhead part
14: pedestal extension 15: pedestal extension
16: Support bracket part 20: First supply part
30: first discharge part 40: second supply part
50: second discharge part 61: first body part
62: first main flow path part 63: first insertion part
64: first connection passage part 71: second body part
72: 2nd main flow path 74: 2nd connection flow path
80: Side frame part 100: Battery pack
110: first water supply unit 120: first recovery unit
130: second water supply unit 140: second recovery unit

Claims (10)

A support portion that guides the coolant and onto which the battery pack is seated;
a first supply unit coupled to one end of the support unit and communicating with the support unit to supply cooling water;
a first discharge portion coupled to the other end of the pedestal and discharging coolant that has passed through the pedestal;
a second supply unit coupled to the first discharge unit and communicating with the support unit to supply cooling water; and
It includes a second discharge part coupled to the first supply part in communication and discharging the coolant that has passed through the support part,
At least one of the first supply unit and the first discharge unit
a first body portion disposed at an end of the support portion;
a first main flow path formed in the longitudinal direction of the first body portion through which coolant passes;
a first insertion portion extending from the first body portion and inserted into the support portion; and
A plurality of first connection passage portions are formed in the longitudinal direction of the first insertion portion and communicate with the first main passage portion and the support portion,
At least one of the second supply unit and the second discharge unit
a second body portion disposed at an end of the first body portion;
a second main flow path formed in the longitudinal direction of the second body portion through which coolant passes; and
A battery pack for an electric vehicle comprising: a plurality of second connection passage parts formed in the longitudinal direction of the second body part and communicating with the first body part to communicate with the second main flow passage part and the support part; case.
According to paragraph 1,
A battery pack case for an electric vehicle, wherein at least one of the support portion, the first supply portion, the first discharge portion, the second supply portion, and the second discharge portion is extruded.
According to paragraph 1,
At least one of the support, the first supply, the first discharge, the second supply, and the second discharge is joined by one or more of friction stir welding, braze welding, laser welding, and adhesive. A battery pack case for an electric vehicle, characterized by:
The method of claim 1, wherein the support portion
A pedestal top portion on which the battery pack is mounted;
a lower support plate disposed below the upper support plate; and
A battery pack case for an electric vehicle, comprising: a plurality of supporting partition walls connecting the supporting upper plate portion and the supporting lower plate portion and being disposed to be spaced apart to induce linear movement of coolant.
The method of claim 4, wherein the support portion
a pedestal extension extending from both ends of the pedestal top plate; and
It further includes a support lower extension part extending from both ends of the support lower plate,
A battery pack case for an electric vehicle, characterized in that the first supply part and the first discharge part are inserted between the pedestal upper extension part and the pedestal lower extension part.
The method of claim 4, wherein the support portion
A battery pack case for an electric vehicle, characterized in that it further includes a support bracket part that is integrally molded with the support top part and onto which the battery pack is assembled.
delete delete According to paragraph 1,
A battery pack case for an electric vehicle, characterized in that the first main flow passage part and the second main flow passage part are arranged alternately.
The method of claim 1, wherein at least one of the second supply unit and the second discharge unit
A battery pack case for an electric vehicle, further comprising a side frame portion molded integrally with the second body portion.

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