WO2019198897A1

WO2019198897A1 - Battery pack and power supply device including battery pack

Info

Publication number: WO2019198897A1
Application number: PCT/KR2018/013454
Authority: WO
Inventors: 구은경; 김준영; 양승우; 조경호
Original assignee: 삼성에스디아이 주식회사
Priority date: 2018-04-11
Filing date: 2018-11-07
Publication date: 2019-10-17
Also published as: KR102650966B1; KR20190118819A

Abstract

A battery pack of the present invention comprises: a plurality of battery cells each including a terminal surface on which an electrode terminal is formed, a bottom surface formed on a side opposite to the terminal surface, and a side surface between the terminal surface and the bottom surface; a side plate including a side part, which extends across the side surface of the battery cell, and a bottom part bent from the side part to surround the battery cell and extending across the bottom surface of the battery cell; and a fixing pin fitted into the bottom part to protrude from the bottom part in a direction opposite to the battery cell. The present invention provides a battery pack and a power supply device, which have an improved energy density in comparison with the same volume.

Description

Power supply with battery pack and battery pack

The present invention relates to a battery pack and a power supply comprising a battery pack.

Typically, a secondary battery is a battery that can be charged and discharged, unlike a primary battery that is not rechargeable. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid cars, electric bicycles, uninterruptible power supplies, etc., and may also be used in the form of a single battery, depending on the type of external devices. It is also used in the form of a module that connects the batteries of the unit into a unit.

A small mobile device such as a mobile phone can operate for a predetermined time with the output and capacity of a single battery. The module type including the battery is preferred, and the output voltage or the output current can be increased according to the number of built-in batteries.

One embodiment of the present invention includes a battery pack and a power supply device having an improved energy density relative to the same volume.

The battery pack of the present invention,

A plurality of battery cells each including a terminal surface on which electrode terminals are formed, a bottom surface formed on an opposite side of the terminal surface, and a side surface between the terminal surface and the bottom surface;

A side plate including a side portion extending across the side of the battery cell, and a bottom portion bent to surround the battery cell from the side portion and extending across the bottom surface of the battery cell; And

And a fixing pin fitted to the bottom portion so as to protrude from the bottom portion in a direction opposite to the battery cell.

According to the present invention, by improving the structure of the fixing pin for providing a mounting structure of the battery pack, it is possible to reduce the height and width of the battery pack, and to include a larger number of battery cells for the same volume, the same mounting By mounting a larger number of battery packs compactly over an area, a battery pack and a power supply having a high energy density relative to the same volume can be provided.

1 is a perspective view of a power supply device according to a preferred embodiment of the present invention.

2 and 3, different exploded perspective views of the power supply shown in FIG. 1 are shown.

4 shows a perspective view of the battery cell shown in FIG. 1.

FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 1.

6 is a perspective view for explaining the coupling between the fixing pin and the bottom portion.

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6.

FIG. 8 is a view schematically illustrating a coupling process of the fixing pin illustrated in FIG. 6.

FIG. 9 is a perspective view illustrating the fixing pin of FIG. 6.

10 shows a coupling structure of a fixing pin according to a comparison compared with the present invention.

FIG. 11 is a view illustrating a bottom surface of the battery pack shown in FIG. 2, illustrating a layout of the fixing pins.

In FIG. 12 a modified embodiment of the power supply shown in FIG. 5 is shown.

Figure 13 shows a power supply according to a comparative example compared with the present invention.

The battery pack of the present invention,

For example, the bottom portion may be formed with a through hole for fitting the fixing pin.

For example, the fixing pin may be fitted into the through hole from an upper surface of the bottom portion facing the battery cell, and may be pressed against the upper surface of the bottom portion surrounding the through hole.

For example, the fixing pin includes a relatively large diameter head portion and a relatively small diameter pillar portion,

The head part may be press-fitted with respect to an upper surface of the bottom part surrounding the through hole.

For example, the head portion of the fixing pin may be formed with a press-in projection projecting toward the top of the bottom portion.

For example, the fixing pin and the bottom portion may be integrally coupled.

For example, the fixing pin and the bottom portion may be divided by a boundary line that can distinguish each other, and may be discontinuously connected with the boundary line therebetween.

For example, the fixing pin and the bottom portion may be formed of different materials.

For example, an upper surface of the fixing pin may be formed substantially flat with an upper surface of the bottom portion deviating from the fixing pin, or an upper surface of the fixing pin may be formed at a level lower than an upper surface of the bottom portion deviating from the fixing pin. have.

For example, the fixing pin may be drawn downward in the thickness direction of the bottom portion with respect to the upper surface of the bottom portion which is out of the fixing pin.

For example, an upper surface of the fixing pin and an upper surface of the bottom portion deviating from the fixing pin may support the bottom surface of the battery cell together.

For example, the fixing pins may be disposed in plural in intermittent positions so as to be spaced apart from each other along the longitudinal direction of the bottom portion.

For example, the fixing pin may be formed at a central position along the length direction of the bottom portion.

For example, the fixing pin may be formed at a first position between both end positions and the center position in addition to the center position along the length direction of the bottom portion.

For example, the first position may be a position relatively closer to a center position than a position at both ends in the length direction of the bottom portion.

For example, the fixing pin may be formed to be concentrated at a central position rather than at both end positions along the length of the bottom portion.

For example, the bottom portion may extend across an edge adjacent to a side plate of a bottom surface of the battery cell,

The central position of the bottom surface may be exposed from the bottom portion.

On the other hand, the power supply according to another aspect of the present invention,

A side plate including a side portion extending across the side of the battery cell, and a bottom portion bent to surround the battery cell from the side portion and extending across the bottom surface of the battery cell;

A fixing pin fitted to a bottom part to protrude from the bottom part in a direction opposite to the battery cell; And

And a mounting panel having a fixing hole formed therein so that the fixing pin protruding from the bottom portion is inserted therein.

For example, the depth of the fixing hole may be formed deeper than the protruding length of the fixing pin protruding from the bottom portion.

Hereinafter, a battery pack and a power supply device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of a power supply device according to a preferred embodiment of the present invention. 2 and 3, different exploded perspective views of the power supply shown in FIG. 1 are shown. 4 shows a perspective view of the battery cell shown in FIG. 1. 5 is a cross-sectional view taken along the line V-V of FIG. 1.

1 to 3, a power supply apparatus according to an embodiment of the present invention may include a battery pack 100 and a mounting panel 200 on which the battery pack 100 is mounted.

In the accompanying drawings, the battery pack 100 is shown to form a power supply with the mounting panel 200, the battery pack 100 of the present invention, the mounting panel 200 It may not be mounted and may be formed in a configuration independent of the mounting panel 200. That is, in the drawings attached to the present specification, the battery pack 100 is illustrated with the mounting panel 200, but technical features related to the battery pack 100 described below may include the mounting panel 200. The same may be applied to the battery pack 100 that is independently configured, and the battery pack 100 that is independently configured without being mounted to the mounting panel 200 may be included in the technical scope of the present invention.

The battery pack 100 of the present invention may be mounted inside a device such as an electric vehicle that receives driving power from the battery pack 100, and may be mounted on the mounting panel 200 of the electric vehicle. For example, the battery pack 100 mounted on the mounting panel 200 may form a power supply device of the present invention, and may form a power supply device for supplying driving power for an electric vehicle.

The battery pack 100 may include a plurality of battery cells 10 and side plates 50 disposed on both sides of the battery cells 10 with the plurality of battery cells 10 interposed therebetween. In addition, the battery pack 100 may include an end block 40 disposed at both ends of the group of battery cells 10 along the arrangement direction of the battery cells 10.

Referring to FIG. 4, the battery cell 10 includes a terminal surface T on which an electrode terminal 11 is formed, a bottom surface B formed on an opposite side of the terminal surface T, and the terminal surface ( Main surface (M) connected between T) and the bottom surface (B) but having a relatively large area, and a side (S) formed between the terminal surface (T) and the bottom surface (B) but having a relatively narrow area (S). ) May be included. The battery cell 10 may include a terminal surface T, a bottom surface B, a pair of main surfaces M, and a pair of side surfaces S, and may have a substantially rectangular parallelepiped shape. The battery cells 10 may be arranged in a row together with the plurality of battery cells 10, and the plurality of battery cells 10 may be arranged such that neighboring battery cells 10 face the main surface M of each other. Can be arranged.

Referring to FIG. 3, the side plates 50 may extend across the plurality of battery cells 10 along the arrangement direction of the battery cells 10, and may be paired to both sides of the battery cells 10. It can be formed. The side plate 50 extends across side surfaces 51 extending across side surfaces S of the plurality of battery cells 10 and bottom surfaces B of the plurality of battery cells 10. The bottom portion 55 may include a top portion 57 extending across the terminal surfaces T of the plurality of battery cells 10.

The side part 51 may extend across the side surfaces S of the plurality of battery cells 10, and end blocks 40 surrounding the outer circumference of the battery cell 10 together with the side parts 51. The plurality of battery cells 10 can be structurally bound and modularized by The side part 51 structurally binds the plurality of battery cells 10 together with the end block 40, and thermally contacts the side surfaces S of the plurality of battery cells 10 so that the plurality of battery cells ( 10) may be promoted.

The side part 51, together with the end block 40, may be formed to surround the outer circumference of the battery cell 10 to structurally bind the plurality of battery cells 10, and may have a side surface of the battery cell 10. It extends across S and thermally contacts the side surface S of the battery cell 10 to function as a heat sink of the plurality of battery cells 10. In addition, the side part 51 thermally contacts the side surfaces S of the plurality of battery cells 10 to prevent heat from accumulating in some battery cells 10 or local degradation of some battery cells 10, It may serve to spread heat to other battery cells 10 around.

The bottom part 55 may be bent inward from the side part 51 toward the battery cell 10 to extend to surround the battery cell 10, and the side surface S of the battery cell 10 may be extended. It may be bent from the side portion 51 facing the surface B may be bent to face the bottom surface (B) of the battery cell (10).

The bottom portion 55 supports the bottom surface B of the battery cell 10 while extending across the bottom surfaces B of the plurality of battery cells 10 along the arrangement direction of the battery cells 10. Can be. The bottom portion 55 may extend across both edges adjacent to the side plate 50 of the bottom surface B of the battery cell 10 to expose the center of the bottom surface B. FIG. The bottom portion 55 does not cover the entire bottom surface B of the battery cell 10, but covers an edge adjacent to the side plate 50 but exposes the center of the bottom surface B, thereby A structure that is more advantageous for heat dissipation can be provided.

The bottom part 55 may be fitted with a fixing pin 80 for mounting or fixing the position of the battery pack 100. More specifically, the bottom portion 55 may be fitted so that the fixing pin 80 protrudes, and the fixing pin 80 may be arranged in plurality spaced apart from each other along the longitudinal direction of the bottom portion 55. Can be. The fixing pin 80 may protrude from the bottom portion 55 in a direction opposite to the battery cell 10. The fixing pin 80 may provide a mounting structure of the battery pack 100 and provide a coupling structure with a device that receives driving power from the battery pack 100.

For example, the battery pack 100 may be mounted inside a device such as an electric vehicle, and may be mounted on a mounting panel 200 of the electric vehicle. The battery pack 100 mounted on the mounting panel 200 by using the fixing pin 80 may form the power supply device of the present invention and form a power supply device for supplying driving power for an electric vehicle. Can be.

The fixing pin 80 is inserted into the fixing groove 200 ′ of the mounting panel 200 to fix the position of the battery pack 100 and to form physical interference between the battery pack 100 and the mounting panel 200. As a result, the flow and vibration of the battery pack 100 can be suppressed, and the battery pack 100 can be firmly fixed on the mounting panel 200. The fixing pin 80 may be arranged in a plurality of spaced apart from each other along the longitudinal direction of the bottom portion 55, the interval or position of the fixing pin 80 is effective for the flow or vibration of the battery pack 100 Can be designed to be suppressed. This will be described later in more detail.

The top part 57 may be bent inwardly from the side part 51 toward the battery cell 10, and may be bent inwardly so as to surround the battery cell substantially in parallel with the bottom part 55. . More specifically, the top part 57 may be bent from the side part 51 facing the side surface S of the battery cell 10 to be bent to face the terminal surface T of the battery cell 10.

The top portion 57 may support the terminal surface T of the battery cell 10 while extending across the terminal surfaces T of the plurality of battery cells 10 along the arrangement direction of the battery cell 10. have. The top portion 57, along with the bottom portion 55 that is bent in parallel with the top portion 57 from the side portion 51, the terminal surface (T) and the bottom surface (B) of the battery cell 10 along the vertical direction ) Together, it is possible to effectively suppress the flow of the battery cell (10).

The top portion 57 extends across both edges adjacent to the side plate 50 of the terminal surface T of the battery cell 10 to expose the center of the terminal surface T on which the electrode terminal 11 is formed. Can be. As described above, the top portion 57 does not cover the entire terminal surface T of the battery cell 10, but the edge adjacent to the side plate 50 is covered, but the center of the terminal surface T is exposed to thereby expose the battery cell 10. The electrode terminals 11) may be exposed to the outside of the battery pack 100, and the plurality of battery cells 10 may be electrically connected to each other through the electrode terminals 11 exposed to the outside of the battery pack 100. Can be.

The top portion 57 may promote heat dissipation to the terminal surface T on which the electrode terminals 11 having a relatively high heat generation due to the concentration of charge and discharge currents are formed. For example, the top portion 57 forms thermal contact with the terminal surface T on which the electrode terminal 11 is formed, and extends to the side portion 51 that occupies a relatively large heat dissipation area, thereby extending the terminal surface T. ) Can be transferred to the side part 51, and local heat concentration of the terminal surface T can be alleviated, and heat dissipation of the terminal surface T can be promoted. That is, the top part 57 is a side part 51 that can provide a heat sink having the largest area among the side plates 50 from the terminal surface T of the battery cell 10 in which the electrode terminal 11 is formed. It is possible to form a heat dissipation path to be connected.

End blocks 40 may be disposed at both ends of the group of battery cells 10 along the arrangement direction of the battery cells 10. The end block 40 may structurally bind the plurality of battery cells 10 while surrounding the outer periphery of the plurality of battery cells 10 together with the side plate 50. For example, the end block 40 may be formed of a hard resin material to firmly bind the plurality of battery cells 10, and effectively deform deformation such as swelling of the battery cells 10. By suppressing, the fall of the electrical output performance by the shape deformation can be prevented.

The end block 40 may be provided with a fastening hole 40` to which a bushing member (not shown) may be fitted, and the bushing member (not shown) may pass through the fastening hole 40` to mount a mounting panel ( By being inserted into the battery pack 200, the battery pack 100 may be fixed on the mounting panel 200. The bushing member (not shown) penetrating the end block 40 and fitted to the mounting panel 200, together with the fixing pin 80 penetrating the side plate 50 and fitted to the mounting panel 200, is a battery. The pack 100 may be fixed on the mounting panel 200, and the battery pack 100 may be fixed on the mounting panel 200 by a bushing member (not shown) and the fixing pin 80. 200).

The end block 40 may be formed of an insulating resin material to provide a position of the output terminal 15. The plurality of battery cells 10 forming the battery pack 100 may be electrically connected to each other by a bus bar (not shown) that electrically connects electrode terminals 11 of different battery cells 10 to each other. In addition, an electrical output may be provided through the output terminal 15.

Referring to FIG. 5, in the power supply device according to the exemplary embodiment of the present invention, the fixing pin 80 of the battery pack 100 is fitted into the fixing groove 200 ′ of the mounting panel 200, thereby mounting the mounting panel. The battery pack 100 is fixed on the position 200, and the mounting of the battery pack 100 may be performed. In this case, the fixing pin 80 may protrude from the bottom portion 55 in the opposite direction to the battery cell 10, and the protruding length f1 from the bottom portion 55 may be defined by the battery pack 100. It may be formed to a length sufficient for fixing the position. In addition, the depth f2 of the fixing groove 200 ′ may be formed to correspond to the protruding length f1 of the fixing pin 80. In one embodiment of the present invention, the depth f2 of the fixing groove 200 ′ may be formed deeper than the protruding length f1 of the fixing pin 80. In this structure, the depth f2 of the fixing groove 200 ′ is formed deeper than the protruding length f1 of the fixing pin 80, so that the bottom surface of the bottom portion 55 forming the lower portion of the battery pack 100 is formed. Depth f2 of the fixing groove 200 ′ and the fixing pins 200 are in contact with the mounting panel 200 and the battery pack 100 is lifted over the mounting panel 200 so that the height of the power supply does not increase. To allow sufficient margin between the protruding lengths f1 of 80). If the battery pack 100 does not come into close contact with the mounting panel 200 and is lifted over the mounting panel 200, the height of the power supply increases and the energy density of the unit volume decreases.

6 is a perspective view for explaining the coupling between the fixing pin and the bottom portion. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6. FIG. 8 is a view schematically illustrating a coupling process of the fixing pin illustrated in FIG. 6. FIG. 9 is a perspective view illustrating the fixing pin of FIG. 6.

Referring to the drawings, the fixing pin 80 may be formed to protrude from the bottom portion 55 and may be integrally formed with the bottom portion 55. The fixing pin 80 and the bottom portion 55 are integrally formed, so that the fixing pin 80 and the bottom portion 55 are firmly coupled to each other, so that the fixing pin 80 and the bottom portion 55 are connected to each other. It may mean that they are not separated from each other without physical damage. The fixing pin 80 may be integrally formed with the bottom part 55, but may be formed of a component different from the bottom part 55, and may be integrally coupled to the bottom part 55. In one embodiment of the present invention, the fixing pin 80 and the bottom portion 55 are formed from one raw material and connected in a continuous form, that is, in a seamless form, without boundary to each other. The fixing pin 80 and the bottom part 55 may be divided by a boundary line that can distinguish each other, and have a structure discontinuously connected with the boundary line therebetween. For example, the fixing pin 80 and the bottom portion 55 may be formed of different materials, and the fixing pin 80 may be formed of steel or stainless steel material, and the bottom portion 55 Or may be formed of a material different from that of the side plate 50.

The fixing pin 80 is inserted into the through hole 50 ′ provided in the bottom part 55, and is pressed at a high pressure around the through hole 50 ′ and pressed against the periphery of the through hole 50 ′. The bottom portion 55 may be integrally coupled with the furnace. For example, as shown in FIG. 8, in a state where the fixing pin 80 is loosely fitted in the through hole 50 ′, a punch P is punched around the through hole 50 ′ in which the fixing pin 80 is inserted. ) And the anvil (A, anvil), the pressing pin (P, punch) to provide a high pressure by pressing the fixing pin 80 against the bottom portion 55 around the through hole (50`) The fixing pin 80 and the bottom portion 55 may be integrally coupled to each other. That is, the coupling between the fixing pin 80 and the bottom portion 55 is made by press-fitting based on a high pressure, the fixing pin 80 is a through hole (50 ') by the high pressure of the punch (P, punch) By being inserted into the bottom portion 55 in the form of a periphery, a rigid coupling may be formed between the fixing pin 80 and the periphery of the through hole 50 '.

6 and 7, the fixing pin 80 is inserted into the through hole 50 ′ from the top surface 55 a of the bottom portion 55 and surrounds the bottom hole 55 ′. It may be pressed against the top surface 55a of the), and the fixing pin 80 is pressed against the top surface 55a of the bottom portion 55, the firm coupling between the fixing pin 80 and the bottom portion 55 is made Can be. Here, the upper surface 55a of the bottom portion 55 may mean a surface of the bottom portion 55 that faces the battery cell 10.

Referring to FIG. 9, the fixing pin 80 may be formed such that a head portion 85 having a relatively large diameter and a pillar portion 81 having a relatively small diameter are coaxially connected to each other. . The head portion 85 may be formed to have a relatively large diameter and may be pressed against the periphery of the through hole 50 ′ of the bottom portion 55. A plurality of indentation protrusions 88 may be formed in the head portion 85, and the indentation protrusions 88 may be formed in a boundary area of the head portion 85 with the pillar portion 81. The pillar portion 81 may be formed to have a relatively small diameter, and may be inserted into the fixing groove 200 ′ of the mounting panel 200 by passing through the through hole 50 ′ of the bottom portion 55.

6 and 7, the head portion 85 is fitted into the through hole 50 ′ from the top surface 55 a of the bottom portion 55 and surrounds the bottom hole 55 ′. It may be pressed against the upper surface (55a) of the, and the head portion 85 may be formed with a plurality of indentation projections 88 protruding toward the upper surface (55a) of the bottom portion (55). The indentation protrusion 88 may be firmly fixed to the upper surface 55a of the bottom portion 55 surrounding the through hole 50`. The indentation protrusions 88 may be arranged in a radial manner along a circumference of the head portion 85 to be formed in plural. As shown in FIG. 6, the indentation trace 88 ′ by the indentation protrusion 88 of the fixing pin 80 may be formed around the through hole 50 ′ where the fixing pin 80 is pressed. In addition, a plurality of indentation marks 88` may be formed radially along the periphery of the through hole 50`.

In one embodiment of the present invention, the fixing pin 80 and the bottom portion 55 does not form a screw coupling, but is press-fitted by the high pressure of the punch (P, punch), the fixing pin 80 No spiral is formed on the sidewall of the through hole 50 '. The bottom portion 55 extends integrally from the side portion 51, and the side plate 50 including the bottom portion 55 and the side portion 51 may be formed of a thin metal plate, It is not easy to form a spiral in the through hole 50 'of the bottom portion 55 having a thickness. Thus, in the present invention, the bottom portion 55 is formed in a press-fitting manner based on the high pressure of the punch P without applying screwing to the bottom portion 55 having a thin thickness and the fixing pin 80. ) And fixing pins 80 are coupled to each other.

Unlike the present invention, in order to form a screw coupling between the bottom portion 55 and the fixing pin 80, it is necessary to increase the thickness of the bottom portion 55 to an extent sufficient to form a spiral, but the thickness of the bottom portion 55 is increased. In this case, the height of the battery cell 10 supported on the bottom part 55 is increased, and as a result, the height of the entire battery pack 100 is increased, which is not preferable in terms of energy density to unit volume.

Referring to FIG. 7, the fixing pin 80 may not form an additional height above the top surface 55a of the bottom portion 55 that is beyond the fixing pin 80. For example, the fixing pin 80 may include a head portion 85 and a pillar portion 81, and the upper surface 85a of the head portion 85 is bottomed out of the head portion 85. The upper surface 55a of the upper part 55a of the part 55 forms the same flat plane, or the upper surface 85a of the head part 85 is the upper surface 55a of the bottom part 55 outside the head part 85. Lower levels can be formed. Here, the upper surface 55a of the bottom portion 55 may mean a surface of the bottom portion 55 that faces the battery cell 10. Similarly, the upper surface of the fixing pin 80 or the upper surface 85a of the head portion 85 may mean a surface of the fixing pin 80 or the head portion 85 facing the battery cell 10. The upper surface 55a of the bottom portion 55 deviating from the fixing pin 80 or the upper surface 55a of the bottom portion 55 deviating from the head portion 85 is the upper surface 55a of the bottom portion 55. It may mean a non-compression surface which is not compressed by the fixing pin 80 or the head 85, and may mean a surface that is not flattened by the fixing pin 80 or the head 85. have.

As the fixing pin 80 is pressed against the periphery of the through hole 50`, the head portion 85 of the fixing pin 80 is formed on the upper surface 55a of the bottom portion 55 surrounding the through hole 50`. Is pressed against the upper surface 55a of the bottom portion 55 outside the head portion 85, that is, the upper surface 55a of the flat bottom portion 55 It may be drawn downward by a predetermined depth along the thickness direction of the part 55. Accordingly, the top surface 85a of the head portion 85 is the same as the top surface 55a of the bottom portion 55 outside the head portion 85 or of the bottom portion 55 outside the head portion 85. The level lower than the upper surface 55a can be formed.

Referring to the drawings, in the comparative example, unlike the present invention, the head portion 5 of the fixing pin 8 is padded over the top surface 55a of the bottom portion 55 surrounding the through hole 50 '. Over, the head portion 5 forms an additional height h from the top surface 55a of the bottom portion 55 and of the head portion 5 protruding from the top surface 55a of the bottom portion 55. The upper surface 5a lifts the battery cell 10 to increase the height of the battery pack 100 and lower the energy density relative to the unit volume of the battery pack 100.

In the embodiment of the present invention shown in FIG. 7, the head portion 85 of the fixing pin 80 is pressed against the upper surface 55a of the bottom portion 55 surrounding the through hole 50 ′. Based on the upper surface 55a of the bottom portion 55 deviating from the portion 85, that is, the upper surface 55a of the flat bottom portion 55, the bottom portion 55 is drawn downward along a thickness direction of the bottom portion 55 by a predetermined depth. As illustrated in FIG. 10, the pads are not coupled in a form that is padded over the top surface 55a of the bottom portion 55. Accordingly, the upper surface 85a of the head portion 85 and the upper surface 55a of the bottom portion 55 deviating from the head portion 85 are formed to be substantially flat or the upper surface 85a of the head portion 85. ) May form a level lower than the top surface 55a of the bottom portion 55 out of the head portion 85. That is, at least the top surface 85a of the head portion 85 may not protrude upward from the top surface 55a of the bottom portion 55 that is out of the head portion 85. For example, as shown in FIG. 7, in one embodiment of the present invention, the upper surface 85a of the head portion 85 and the upper surface 55a of the bottom portion 55 are formed to be substantially flat so that the battery The cells 10 can be supported together.

As described above, the height of the battery pack 100 varies depending on the relative height of the upper surface 55a of the bottom portion 55 and the upper surface 85a of the fixing pin 80 or the head portion 85. The energy density relative to the unit volume of the pack 100 will vary. In the embodiment of the present invention, the fixing pin 80 or the head portion 85 of the fixing pin 80 or the head portion 85 does not protrude from the upper surface 55a of the bottom portion 55. The upper surface 85a is formed to be substantially flat with the upper surface 55a of the bottom portion 55 or is formed at a level lower than the upper surface 55a of the bottom portion 55, so that the battery is coupled with the fixing pin 80. The energy density of the pack 100 does not decrease.

Referring to the drawings, the fixing pin 80 may be formed in plural in an intermittent position so as to be spaced apart from each other along the longitudinal direction of the bottom portion 55. The fixing pin 80 serves to fix the position of the battery pack 100 with respect to the mounting panel 200 on which the battery pack 100 is mounted, and thus, the center position C of the battery pack 100 that is vulnerable to vibration. Can be placed intensively. For example, the fixing pin 80 may be disposed in a central position C, rather than both end positions E along the longitudinal direction of the bottom portion 55, and both end positions of the bottom portion 55. Rather than (E) or a position close thereto, the center portion C of the bottom portion 55 or a position closer thereto may be disposed relatively.

When the vibration of the battery pack 100 is viewed as the vibration of the string fixed at both ends, the maximum amplitude may be generated at the center position of the string, and thus, the center position C of the battery pack 100, that is, the battery cell 10. ) By damaging the battery pack 100 due to vibration of the battery pack 100 by intensively arranging the fixing pin 80 at a central position C and a position close thereto along the longitudinal direction of the bottom portion 55 crossing the). Can be effectively prevented. A fixing pin 80 is preferably formed at the central position C of at least the battery pack 100, that is, at the central position C along the longitudinal direction of the bottom portion 55 crossing the battery cell 10. In addition, the fixing pin 80 may be formed in a symmetrical position with respect to the fixing pin 80 at the central position C. FIG.

Fixing pins 80 may be formed at both end positions E in the longitudinal direction of the battery pack 100, that is, at both end positions E in the longitudinal direction of the bottom part 55. However, in one embodiment of the present invention, a bushing member (not shown) is inserted into the end block 40 at both end positions E along the arrangement direction of the battery cell 10 so as to pass through the fastening hole 40`. The bushing member (not shown) may be inserted into the mounting panel 200 by passing through the fastening hole 40 ′, thereby fixing both end positions E along the length direction of the battery pack 100. Therefore, separate fixing pins 80 may not be formed at both end positions E of the battery pack 100. The fixing pin 80 and the bushing member (not shown) may together fix the battery pack 100 on the mounting panel 200, and mount the battery pack 100 on the mounting panel 200. have.

In one embodiment of the present invention, the fixing pin 80, the central position (C) more susceptible to vibration than the end position (E) in the longitudinal direction of the battery pack 100, that is, the longitudinal direction of the bottom portion (55) Can be placed relatively close to Although not shown in the drawings, in an embodiment in which a plurality of fixing pins 80 are formed along the longitudinal direction of the bottom portion 55, the distance between the fixing pins 80 adjacent to each other is centered from both end positions E. FIG. It may decrease gradually as it goes to position (C). That is, the fixing pin 80 may be formed more densely at a tighter spacing at the center position C than at both end positions E. FIG.

In one embodiment of the invention, the fixing pin 80, in addition to the center position (C) along the longitudinal direction of the battery pack 100, the first position (between the end position (E) and the center position (C) ( Also formed in the L1, it is possible to stably position the high output battery pack 100 including a relatively large number of battery cells 10 extending. In this case, the first position L1 may be designed closer to the center position C than the both ends position E in the longitudinal direction of the battery pack 100 so as to effectively suppress the vibration of the battery pack 100. have.

In FIG. 12 a modified embodiment of the power supply shown in FIG. 5 is shown.

Referring to the drawings, the power supply apparatus of the present invention may include a battery pack 100 and a mounting panel 200 on which the battery pack 100 is mounted. The mounting panel 200 may be provided in a device in which the battery pack 100 is mounted and receives driving power from the battery pack 100, for example, an electric vehicle.

In the power supply shown in FIG. 12, a plurality of battery packs 100 may be mounted in parallel on one mounting panel 200. For example, when a high output high capacity electrical output is required, a plurality of battery packs 100 may be mounted in one mounting panel 200 in parallel, and when a high output such as an electric vehicle is required Two or more battery packs 100 may be mounted. In this case, the battery pack 100 may be fixed on the mounting panel 200 through a fixing pin 80 fitted to the side plate 50, and in particular, the side part 51 of the side plate 50. By forming the fixing pin 80 on the side of the bottom portion 55 which is bent inwardly to surround the battery cells 10, the battery packs 100 mounted adjacent to each other on one mounting panel 200 are concentrated. It can be compactly mounted in the form. That is, the first interval d1 between the battery packs 100 mounted adjacent to each other may be sufficient to prevent interference between the battery packs 100, for example, physical interference, thermal interference, or electrical interference. It is sufficient to have a clearance of, and it is not necessary to set the first interval d1 larger than necessary.

Referring to the drawings, the power supply apparatus according to the comparative example includes a mounting panel 200 and a plurality of battery packs 100` mounted on the mounting panel 200. In the comparative example, the fixing member 18 for fixing the position of the battery pack 100 ′ passes through the wing portion 58 ′ of the side plate 50 ′ and fixes the fixing groove 200 ′ of the mounting panel 200. ) At this time, the fixing member 18 is not fitted to the bottom portion 55 'bent inward so as to surround the battery cell 10 from the side portion 51', and the battery cell from the side portion 51 '. It is fitted to a separate wing portion 58` which is bent in an outward direction opposite to 10. Accordingly, a separate wing 58 'is formed in an outer direction of the battery pack 100', and the battery pack 100 is formed by wings 58 'formed at both sides of the battery pack 100'. ) Width size is increased.

In the power supply device according to the comparative example, the second interval d2 between the battery packs 100 'neighboring each other needs to be increased by the wings 58' formed on both sides of the battery pack 100 '. In addition, it is necessary to increase the width of the wing portion 58 'formed at both sides of the battery pack 100' rather than at least the first interval d1 of the present invention shown in FIG. In this comparative example, the plurality of battery packs 100` may not be mounted in a compact form, so that the number of battery packs 100` that can be mounted on the mounting panel 200 having the same area is reduced, and the energy density is lowered. .

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it is merely exemplary, and various modifications and equivalent other embodiments are possible from those skilled in the art to which the present invention pertains. You will understand the point.

The present invention can be applied to a battery pack as an energy source capable of charging and discharging and various devices using the battery pack as a driving power source.

Claims

A plurality of battery cells each including a terminal surface on which electrode terminals are formed, a bottom surface formed on an opposite side of the terminal surface, and a side surface between the terminal surface and the bottom surface;

A side plate including a side portion extending across the side of the battery cell and a bottom portion bent to surround the battery cell from the side portion and extending across the bottom surface of the battery cell; And

And a fixing pin fitted to the bottom portion to protrude from the bottom portion in a direction opposite to the battery cell.
The method of claim 1,

The bottom part is a battery pack, characterized in that the through hole for the fixing pin is formed.
The method of claim 2,

The fixing pin is inserted into the through hole from the upper surface of the bottom portion facing the battery cell, the battery pack, characterized in that pressed against the upper surface of the bottom portion surrounding the through hole.
The method of claim 2,

The fixing pin includes a relatively large diameter head portion and a relatively small diameter pillar portion,

The head part, the battery pack, characterized in that the press-fitted to the upper surface of the bottom portion surrounding the through hole.
The method of claim 4, wherein

The head of the fixing pin, the battery pack, characterized in that the pressing projection protruding toward the upper surface of the bottom portion is formed.
The method of claim 1,

The fixing pin and the bottom portion, characterized in that the battery pack is integrally coupled.
The method of claim 6,

The fixing pin and the bottom portion are partitioned by a boundary line that can distinguish from each other, the battery pack, characterized in that discontinuously connected across the boundary line.
The method of claim 7, wherein

The fixing pin and the bottom portion, the battery pack, characterized in that formed of different materials.
The method of claim 1,

The upper surface of the fixing pin is formed to be substantially flat with the upper surface of the bottom portion out of the fixing pin, or the upper surface of the fixing pin is formed at a level lower than the upper surface of the bottom portion out of the fixing pin pack.
The method of claim 9,

The fixing pin is led downward in the thickness direction of the bottom portion relative to the upper surface of the bottom portion out of the fixing pin.
The method of claim 9,

And an upper surface of the fixing pin and an upper surface of the bottom portion deviating from the fixing pin support the bottom surface of the battery cell together.
The method of claim 1,

The fixing pin is a battery pack, characterized in that disposed in a plurality in an intermittent position to be spaced apart from each other along the longitudinal direction of the bottom portion.
The method of claim 12,

The fixing pin is a battery pack, characterized in that formed in the center position in the longitudinal direction of the bottom portion.
The method of claim 13,

The fixing pin is formed in the first position between the end position and the center position, in addition to the center position in the longitudinal direction of the bottom portion.
The method of claim 14,

The first position is a battery pack, characterized in that the position relatively closer to the center position than the end position along the longitudinal direction of the bottom portion.
The method of claim 12,

The fixing pin is a battery pack, characterized in that formed in a central position rather than both ends in the longitudinal direction of the bottom portion.
The method of claim 1,

The bottom portion extends across an edge adjacent to a side plate of a bottom surface of the battery cell,

The center position of the said bottom surface is exposed from the said bottom part, The battery pack characterized by the above-mentioned.
A plurality of battery cells each including a terminal surface on which electrode terminals are formed, a bottom surface formed on an opposite side of the terminal surface, and a side surface between the terminal surface and the bottom surface;

A side plate including a side portion extending across the side of the battery cell, and a bottom portion bent to surround the battery cell from the side portion and extending across the bottom surface of the battery cell;

A fixing pin fitted to a bottom part to protrude from the bottom part in a direction opposite to the battery cell; And

And a mounting panel having a fixing hole formed therein so that the fixing pin protruding from the bottom portion is inserted therein.
The method of claim 18,

The depth of the fixing hole, the power supply device characterized in that formed deeper than the protruding length of the fixing pin protruding from the bottom.