KR20190095048A - Battery pack having battery module supporting structure using plate spring and automobile having the same - Google Patents

Abstract

According to the present invention, a battery pack comprises: a pack housing; one or multiple battery modules mounted in the pack housing; and a plate spring provided in the pack housing to support the battery module. A support structure of the battery module is simplified and is more stably supported. In forming the battery pack, economic feasibility and efficiency can be increased.

Description

Battery pack having a battery module supporting structure using a leaf spring and a vehicle having the same {Battery pack having battery module supporting structure using plate spring and automobile having the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery used in an electric vehicle and the like, and more particularly, to a battery pack in which several battery modules are mounted.

In general, the battery pack is installed in various devices that require electricity, such as an electric vehicle (EV), a hybrid vehicle (HEV), an electric bicycle, and is configured to supply electricity.

A battery pack is typically equipped with a plurality of battery modules, and further includes various control and protection systems such as a battery management system (BMS) and a cooling system.

The battery module is configured by grouping the battery cells, which are the basic units of the battery, in which the battery cells generally use rechargeable secondary batteries.

The battery pack has a structure in which a plurality of battery modules are mounted in the pack housing. In general, the battery pack is fixedly installed in the pack housing by using fastening means using bolts and nuts.

However, when fixing the battery module using the fastening means, there is a problem in that the structure becomes more complicated and the number of assembly operations increases.

In addition, if the battery module is fixed only to the bottom of the pack housing, it may be vulnerable to external force such as left and right shake, resulting in distortion, and in case of fixing the battery module using an additional fixing device, the structure is complicated. There is a problem.

In particular, when applied to a small car, such as a golf cart, the space for installing the battery pack is narrow, the size of the pack housing should also be made small, on the contrary, the battery capacity is required to be larger.

Therefore, there is a demand for developing a battery pack that can support the battery module simply and stably while reducing the size of the pack housing.

Korea Patent Publication No. 10-2015-0073953 Korean Patent Registration No. 10-1769577

The present invention has been made to solve the above problems, it is configured to support the battery module using a leaf spring in the pack housing can support the support structure of the battery module more simply and more stable, accordingly economical and efficiency An object of the present invention is to provide a battery pack and a vehicle having the same.

Battery pack according to the present invention for realizing the above object, the pack housing; One or more battery modules mounted in the pack housing; It is characterized in that it comprises a leaf spring provided in the pack housing for supporting the battery module.

Preferably, the battery pack further includes fixing means for fixing the battery module in the pack housing.

The battery module may be configured such that one side is fixed by the fixing means and the other side is supported by the leaf spring.

The battery module may be configured such that the lower side of the center of gravity is fixed by the fixing means and the upper side of the center of gravity is supported by the leaf spring.

The battery module may be configured such that a lower end thereof is fixed to the bottom surface of the pack housing by the fixing means, and an upper end thereof is supported by the leaf spring inside the pack housing.

The pack housing has a configuration in which an upper housing and a lower housing are assembled to each other, the battery module is mounted and fixed to the lower housing, the leaf spring is installed on the upper housing, and the upper housing is connected to the lower housing. When coupled and assembled, the leaf spring is preferably configured to support the battery module while being in close contact with the upper portion of the battery module.

The leaf spring may be configured to be in close contact with the upper surface and the side of the edge portion of the battery module.

The leaf spring may include a plurality of connecting parts configured to elastically support the battery module through a first bent part and a second bent part fixed to the pack housing, and a structure bent between the first and second bent parts. It is preferable that it comprises a.

The connection part may include a contact part configured to contact the battery module, a first elastic part configured between the contact part and the first fixing part to provide elasticity, and configured between the contact part and the second fixing part to provide elasticity. It may be configured to include a second elastic portion to provide.

The contact portion may be configured to contact two surfaces about a corner portion of the battery module.

The contact part may be provided with a pad for eliminating a tolerance at a portion in contact with the battery module.

At least one of the first elastic portion and the second elastic portion is preferably configured to have a damping portion bent in a Z-shaped structure.

The damping part may have a bent portion of 90 ° or less.

Moreover, it is preferable that the motor vehicle which concerns on this invention for implementing the said subject is comprised including said battery pack.

The main problem solving means of the present invention as described above, will be described in more detail and clearly through examples such as 'details for the implementation of the invention', or the accompanying 'drawings' to be described below, wherein In addition to the main problem solving means as described above, various problem solving means according to the present invention will be further presented and described.

Since the battery pack and the vehicle having the same according to the present invention are configured to support the battery module using a leaf spring provided in the pack housing, the support structure of the battery module can be supported simply and more stably. Therefore, there is an effect that can increase the economics and efficiency in configuring the battery pack.

1 is an exploded perspective view showing a battery pack according to a first embodiment of the present invention.
2 is an exploded perspective view illustrating main parts of a battery module support structure in a battery pack according to a first embodiment of the present invention.
3 is a longitudinal sectional view showing a battery pack according to a first embodiment of the present invention.
4 is a perspective view illustrating a leaf spring applied to a battery pack according to a first embodiment of the present invention.
5 is a side view of an essential part showing an angle setting state of the main elastic portion of the leaf spring applied to the battery pack according to the first embodiment of the present invention.
6 is a longitudinal sectional view showing a battery pack according to a second embodiment of the present invention.
7 and 8 are perspective views illustrating a leaf spring applied to a battery pack according to a second embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 5 are views showing a battery pack according to a first embodiment of the present invention, Figure 1 is a full exploded perspective view, Figure 2 is an exploded perspective view of the main portion, Figure 3 is a longitudinal sectional view, Figure 4 is a perspective view of the leaf spring 5 is a side view of the main part of the leaf spring.

Referring to these drawings, the battery pack according to the first embodiment of the present invention includes a pack housing 10, a plurality of battery modules 20 mounted inside the pack housing 10, and the battery module 20. It comprises a mounting means (M) for fixing or supporting in the pack housing (10).

Of course, although not illustrated in the drawing, the pack housing 10 includes electrical components for controlling charging and discharging of the battery module 20, power supply, and the like, and a cooling device for cooling the battery module 20. It is preferable.

Referring to the battery module 20 supporting structure using the leaf spring 40 in such a battery pack as follows.

The pack housing 10 may have a long hexahedral structure by assembling the upper housing 11 and the lower housing 15 together.

Flange portions 12 and 16 are formed at portions where the upper housing 11 and the lower housing 15 are assembled, and the flanges 12 and 16 are formed to be mutually connected with each other by means of fastening means such as bolts. It can be configured to be assembled.

One or more battery modules 20 are mounted in the pack housing 10, and the lower side of the center of gravity is fixed in each battery module 20, and the upper side of the center of gravity uses the leaf spring 40. It can be configured to be supported elastically.

To this end, the battery module 20 may be configured such that the upper portion is elastically supported by the upper spring 11 by the leaf spring 40 in a state where the lower portion is fixed to the bottom surface of the lower housing 15.

The structure in which the battery module 20 is fixed to the lower housing 15 may be made as follows.

The middle panel 30 may be installed on the bottom surface of the lower housing 15 to assemble and fix the battery module 20. In this case, the middle panel 30 may be formed in a rectangular flat structure as a whole, and may be fixed to the bottom surface of the lower housing 15 or fixed by a fastening member.

The battery module 20 may be provided with a hold down bracket 35 that may be assembled to the middle panel 30 at one lower side.

Here, the battery module 20 has a plurality of battery cells 22 are assembled in a bundle to form a hexahedral structure as a whole, and the hold down bracket 35 is disposed below the side where the middle panel 30 is located. It is installed to be connected.

With this structure, when the battery module 20 is mounted on the lower housing 15, the hold down bracket 35 is coupled to overlap the middle panel 30, and the studs provided in the middle panel 30 are provided. The bolt 32 is fitted into the bolt hole 37 of the hold down bracket 35, and in this state, the battery module 20 is fixed to the bottom surface of the lower housing 15 by tightening the nut to the stud bolt 32. You can do it.

The middle panel 30 and the hold down bracket 35 constitute fastening means for fixing the battery module 20 in the pack housing 10, which fixes the lower portion of the battery module 20 to the pack housing 10. The structure is not limited to the structure using the fixing means as described above, of course, can be configured by applying a variety of known battery module fixing structure.

Next, the configuration in which the battery module 20 is supported by the upper housing 11 may be made as follows.

As shown in FIG. 2, the upper housing 11 may be provided with four leaf springs 40 to support both upper sides of the battery module 20.

As such, the four leaf springs 40 installed in the upper housing 11 cover the upper housing 11 in the state in which the battery module 20 is fixed to the lower housing 15, and then the four leaf springs 40 are assembled into the lower housing 15. Leaf spring 40 is in close contact with the upper and both sides of the battery module 20 may be configured to elastically support the top and side of the battery module 20.

For this configuration, the leaf spring 40 is configured on both ends and fixed to the upper housing 11, both side fixing portion 41 and the battery module 20 through the bent structure between the two fixing portion 41 It may be configured to include a plurality of connecting portion 43 for supporting the elastic force.

Both fixing parts 41 are composed of a first fixing part 41a and a second fixing part 41b, and these two fixing parts 41 are fixed to the inner wall of the upper housing 11 by welding or the like. Can be installed. Accordingly, as described above, when the upper housing 11 is assembled to the lower housing 15, the leaf spring 40 may be in close contact with both corner portions of the battery module 20 to elastically support the upper side of the battery module. .

The connecting portion 43 includes a contact portion 45 formed to contact the battery module 20, a first elastic portion 46 configured between the contact portion 45 and the first fixing portion 41a and providing elasticity. It may be configured to include a second elastic portion 47 is provided between the contact portion 45 and the second fixing portion 41b to provide elasticity.

Referring to FIGS. 3 and 4, the configuration of the leaf spring 40 will be described in more detail. The leaf spring 40 is made of an agent that is fixed to the inner surface of the upper housing 11 at an upper position of the battery module 20. 1 fixed part 41a, the 1st connection part 43a bend | folded inwardly of the upper housing 11 from the lower end of the 1st fixing part 41a, and the downward direction at the end of the 1st connection part 43a. The second connecting portion 43b, the third connecting portion 43c bent in the wall direction of the upper housing 11 at the end of the second connecting portion 43b, and the lower portion at the end of the third connecting portion 43c. The fourth connecting portion 43d, the fifth connecting portion 43e bent in the wall direction of the upper housing 11 at the end of the fourth connecting portion 43d, and the downward bending at the end of the fifth connecting portion 43e. And a second fixing part 41b fixed to an inner surface of the upper housing 11.

Here, the first connecting portion 43a and the second connecting portion 43b are bent from the first fixing portion 41 in the direction orthogonal to each other to form the first elastic portion 46. The first elastic part 46 is positioned above the battery module 20 and is configured to support the battery module 20 while corresponding to an external force generated in the up and down direction.

The third connecting portion 43c and the fourth connecting portion 43d are bent in an L-shape to form the contact portion 45. The third connecting portion 43c and the fourth connecting portion 43d are in contact with the top and side surfaces of the battery module 20 with respect to the upper edge. It is preferred to be configured to be in close contact.

The contact portion 45 may be configured by installing a pad 49 for removing the tolerance in order to eliminate the tolerance when the portion in close contact with the battery module 20 occurs.

The pad 49 may be formed using a metal plate, a synthetic resin, a porous member, or the like having a constant area and thickness, and may be used in a state of being fixed to the contact portion 45 of the leaf spring 40 by adhesion or the like.

Then, the bent portion 44a between the fourth connecting portion 43d and the fifth connecting portion 43e, the fifth connecting portion 43e, the bent portion 44b between the fifth connecting portion 43e and the second fixing portion 41b. ) Is a part constituting the second elastic portion 47.

The second elastic portion 47 is continuously bent at an angle θ of 90 ° or less so as to smoothly absorb the lateral vibration (or external force) of the battery module 20 to have a Z-shaped (or S-shaped) structure. It is preferably configured to include a damping portion 48 made.

The damping portion 48 may be more preferably bent at an angle θ of 45 ° or less to provide a sufficient damping effect as shown in FIG. 5.

In this way, the damping part 48 formed on the second elastic part 47 may be applied to the first elastic part 46.

Meanwhile, in the first embodiment of the present invention as described above, the lower portion of the battery module 20 is fixed, and the upper portion of the battery module 20 has been described with respect to the configuration using the leaf spring 40, but the implementation Depending on the conditions, one side of the battery module 20 may be fixed and the other side may be configured to be supported by the leaf spring 40. That is, in the pack housing 10, if one side of the battery module 20 is fixed and the other side is elastically supported by the leaf spring 40, the battery module 20 may have various fixing and supporting positions, structures, and the like. It can be modified.

In addition, the shape and structure of the leaf spring 40 may also be appropriately modified according to the internal structure of the pack housing 10, the external structure of the battery module 20, the external force direction and position applied to the battery module 20, and the like. Could be.

6 to 8 illustrate a structure for supporting the battery module 20 using the leaf spring 40A of another structure.

6 is a longitudinal sectional view showing a battery pack according to a second embodiment of the present invention, Figures 7 and 8 are perspective views showing a leaf spring applied to the battery pack according to a second embodiment of the present invention.

In the leaf spring 40 of the first embodiment of the present invention described above, both the first fixing portion 41a and the second fixing portion 41b are fixed to the inner wall side of the upper housing 11, but according to the second embodiment of the present invention. The leaf spring 40A in the example shows a configuration in which the first fixing portion 51a and the second fixing portion 51b are fixed to the ceiling surface (or upper structure) and the inner wall surface of the upper housing 11.

That is, referring to FIGS. 7 and 8, the leaf spring 40A according to the present embodiment may include a first fixing part 51a fixed to the ceiling surface of the upper housing 11 and a first fixing part 51a. The first connecting portion 53a bent downward at one end, the second connecting portion 53b bent in the wall direction of the upper housing 11 at the end of the first connecting portion 53a, and the second connecting portion 53b. The third connecting portion 53c bent downward from the end of the third connecting portion, the fourth connecting portion 53d bent in the wall direction of the upper housing 11 at the end of the third connecting portion 53c, and the fourth connecting portion 53d. It may be configured to include a second fixing portion (51b) is bent in the downward direction at the end of the fixed to the inner surface of the upper housing (11).

Here, the bent portion of the first fixing portion 51a, the bent portion of the first connecting portion 53a and the second connecting portion 53b constitute the first elastic portion 56, and the second connecting portion 53b and the third connecting portion. 53c constitutes a contact portion 55 in close contact with the battery module 20, and a portion leading to the fourth connection portion 53d and the second fixing portion 51b from the bent portion of the third connection portion 53c is a second portion. The elastic portion 57 is configured.

Here too, the second elastic part 57 constitutes a damping part 58 continuously bent at 90 ° or less so as to buffer the lateral vibration of the battery module 20. It is also possible to configure the damping portion 58 in the first elastic portion 56.

Since the other components may be configured similarly to the configuration of the first embodiment of the present invention described above, the same reference numerals are given to the drawings, and repeated description thereof will be omitted.

Meanwhile, the battery pack according to the present invention as described above may be mounted and applied to an automobile such as an electric vehicle or a hybrid vehicle, and the vehicle according to the present invention includes one or more battery packs according to the present invention. .

As described above, the technical idea described in the embodiments of the present invention may be implemented independently, or may be implemented in combination with each other. In addition, the present invention has been described through the embodiments described in the drawings and the detailed description of the invention, which is merely exemplary, and those skilled in the art to which the present invention pertains various modifications and equivalent other embodiments therefrom It is possible. Therefore, the technical protection scope of the present invention will be defined by the appended claims.

10: pack housing 11: upper housing
15: lower housing 20: battery module
30: middle panel 35: hold down bracket
40, 40A: leaf spring 41, 51: fixing part
43, 53: connection portion 45, 55: contact portion
46, 56: first elastic portion 47, 57: second elastic portion
48, 58: damping part 49: pad

Claims (14)

A pack housing;
One or more battery modules mounted in the pack housing;
And a leaf spring provided in the pack housing to support the battery module. The method according to claim 1,
The battery pack further comprises a fixing means for fixing the battery module in the pack housing. The method according to claim 2,
The battery module, the battery pack, characterized in that the one side is fixed by the fixing means, the other side is configured to be supported by the leaf spring. The method according to claim 2,
The battery module is characterized in that the lower side of the center of gravity is fixed by the fixing means, the upper side of the center of gravity is configured to be supported by the leaf spring. The method according to claim 2,
The battery module has a battery pack, characterized in that the lower end is fixed to the bottom surface of the pack housing by the fixing means, the upper end is supported by the leaf spring inside the pack housing. The method according to claim 1,
The pack housing has a configuration in which the upper housing and the lower housing are assembled to each other,
The battery module is mounted and fixed to the lower housing,
The leaf spring is installed in the upper housing,
And the leaf spring is configured to support the battery module while being in close contact with the upper portion of the battery module when the upper housing is coupled and assembled to the lower housing. The method according to claim 6,
The leaf spring is configured to be in close contact with the upper surface and the side of the corner portion of the battery module. The method according to any one of claims 1 to 6,
The leaf spring may include a plurality of connecting parts configured to elastically support the battery module through a first bent part and a second bent part fixed to the pack housing, and a structure bent between the first and second bent parts. Battery pack comprising a. The method according to claim 8,
The connection part may include a contact part configured to contact the battery module, a first elastic part configured between the contact part and the first fixing part to provide elasticity, and configured between the contact part and the second fixing part to provide elasticity. A battery pack comprising a second elastic portion for providing. The method according to claim 9,
And the contact portion is configured to contact two surfaces about a corner portion of the battery module. The method according to claim 9,
The battery pack, characterized in that the contact portion is provided with a pad for eliminating the tolerance in the portion in contact with the battery module. The method according to claim 9,
At least one of the first elastic portion and the second elastic portion of the elastic portion of the battery pack, characterized in that it has a damping portion bent in a Z-shaped structure. The method according to claim 12,
The damping unit is a battery pack, characterized in that the bent portion is formed to 90 ° or less. An automobile comprising the battery pack according to any one of claims 1 to 6.

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