CN113381118A

CN113381118A - Rechargeable battery pack

Info

Publication number: CN113381118A
Application number: CN202110207964.3A
Authority: CN
Inventors: 李�赫; 李吉锡; 金范柱; 金载昊; 朴建烨; 郑栢麒; 金宪熙; 任志淳; 许银起
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 2020-02-25
Filing date: 2021-02-24
Publication date: 2021-09-10
Anticipated expiration: 2041-02-24
Also published as: KR20210108127A; CN113381118B

Abstract

A rechargeable battery pack is disclosed. The rechargeable battery pack includes: a battery case configured to have an accommodation space formed therein; a plurality of unit modules inserted into the receiving space and each formed by connecting a plurality of unit battery cells; a holder unit configured to support the unit modules inside the battery case; and bus bars disposed at an upper portion of the holder unit and connected to electrode terminals of the unit battery cells.

Description

Rechargeable battery pack

Technical Field

The present invention relates to a rechargeable battery pack that stably maintains an appropriate distance between unit modules.

Background

Unlike primary batteries, rechargeable batteries can be repeatedly charged and discharged. Small-capacity rechargeable batteries are used in portable small electronic devices such as mobile phones, notebook computers, and camcorders, and large-capacity rechargeable batteries are used as power sources for driving motors such as electric bicycles, scooters, electric vehicles, and forklifts.

The rechargeable battery may be used not only as one unit battery cell but also as a rechargeable battery pack in which a plurality of unit battery cells are connected in parallel or in series to realize a large capacity. For example, the rechargeable battery pack uses tabs to connect the unit battery cells in series or in parallel, and may have a structure in which current flows from one tab.

In the case of using a plurality of unit battery cells, the rechargeable battery pack should have a structure capable of effectively dissipating heat generated during charging and discharging for high output response and a structure capable of effectively fixing the unit battery cells in response to impact and vibration.

On the other hand, the unit battery cells are fixed inside the battery case by the holder, and since a separation space is formed between the unit battery cells, it is difficult to maintain a stable insulation state due to interference of voltage generated between the battery cells.

The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

Disclosure of Invention

Exemplary embodiments of the present invention have been made in an effort to provide a rechargeable battery pack capable of maintaining a stable insulation state by maintaining an appropriate distance between unit modules.

An exemplary embodiment of the present invention provides a rechargeable battery pack including: a battery case configured to have an accommodation space formed therein; a plurality of unit modules inserted into the receiving space and each formed by connecting a plurality of unit battery cells; a holder unit configured to support the unit modules inside the battery case; and bus bars disposed at an upper portion of the holder unit and connected to electrode terminals of the unit battery cells.

The holder unit may include: a lower holder configured to support the unit modules in the battery case and including a plurality of first spacers disposed between the unit modules; and an upper holder configured to support upper portions of the unit modules, detachably connected to the first spacers, and including a plurality of second spacers disposed between the unit modules.

A plurality of through-holes may be formed at an upper side of the second plate to expose electrode terminals of the unit cells. The plurality of through holes may form a plurality of columns and a plurality of rows on the upper side of the second plate.

The lower holder may include: a first plate configured to mount the unit modules thereon; a first holder configured to have a first insertion portion into which the unit modules are inserted; and a first spacer configured to connect the first plate and the first holder and disposed between the unit modules.

The upper holder may include: a second plate disposed at an upper portion of the unit modules to have through-holes through which portions of the unit modules are exposed; a second holder drawn out from a lower portion of the second plate to have a second insertion portion into which the unit modules are inserted; and a second spacer configured to protrude from a lower portion of the second plate, disposed between the unit modules, and connected to the first spacer.

The first spacer and the second spacer may be removably coupled.

The first coupling protrusion may protrude from an end of the first spacer, and the second coupling protrusion may protrude from an end of the second spacer. The first coupling protrusion and the second coupling protrusion may be in surface contact in a state where the first spacer and the second spacer are coupled.

An insertion groove may be formed at an end of the first spacer, and an insertion protrusion may protrude from an end of the second spacer. The insertion protrusion may be inserted into the insertion groove when the first spacer and the second spacer are coupled.

A guide protrusion for guiding a mounted state of the bus bar may protrude from the second plate.

The guide protrusion may protrude to have a rounded shape along the through-hole to guide the arrangement state of the bus bar.

The bus bar may include: a plurality of first bus bars disposed at an edge of an upper side of the second plate and connected to the electrode terminals; and a plurality of second bus bars disposed on the side surfaces between the first bus bars above the holder unit to be electrically connected to the unit battery cells.

The first bus bar may include: a first body portion provided on a side surface of the through-hole to have a long length in the first direction at an edge of an upper side of the second plate; and a plurality of first lead portions configured to obliquely protrude from a side surface of the first body portion in a second direction crossing the first direction.

The first lead portion may be disposed between the through holes.

The first lead portion may obliquely protrude from a side surface of the first body portion at an angle in a range of 45 degrees to 60 degrees.

The first bus bar and the unit module may be electrically connected to each other by a wire member at an upper side of the holder unit.

A stopper protrusion limiting movement of the bus bar may protrude from a surface of the second plate.

According to exemplary embodiments of the present invention, a rechargeable battery pack may be mounted to maintain a stable insulation state without voltage interference between battery cells by stably maintaining an appropriate distance between unit modules.

Drawings

Fig. 1 illustrates a schematic perspective view of a state in which a cover unit of a rechargeable battery pack is removed according to a first exemplary embodiment of the present invention.

Fig. 2 illustrates a schematic plan view of a state in which a cover unit of the rechargeable battery pack of fig. 1 is removed.

Fig. 3 illustrates a schematic sectional view of a state in which unit modules are fixed by holder units according to a first exemplary embodiment of the present invention.

Fig. 4 shows a schematic cross-sectional perspective view of a main portion of a holder unit according to a first exemplary embodiment of the present invention.

Fig. 5 is a schematic view showing a main part of a connected state of a first spacer and a second spacer according to a first exemplary embodiment of the present invention.

Fig. 6 is a schematic top plan view showing a connection state of the bus bars in part a of fig. 2.

Fig. 7 is a schematic view showing a main part of a connection state of bus bars according to the first exemplary embodiment of the present invention.

Fig. 8 shows a schematic top plan view of a first bus bar according to a first exemplary embodiment of the present invention.

Fig. 9 shows a schematic top plan view of a second bus bar according to a first exemplary embodiment of the present invention.

Fig. 10 is a schematic view showing a main portion of a connected state of a first spacer and a second spacer according to a second exemplary embodiment of the present invention.

Fig. 11 illustrates a schematic perspective view of a rechargeable battery pack according to a third exemplary embodiment of the present invention.

Fig. 12 shows a schematic perspective view of a rechargeable battery pack according to a fourth exemplary embodiment of the present invention.

Detailed Description

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature, and not as restrictive. Like reference numerals refer to like elements throughout the specification.

Fig. 1 illustrates a schematic perspective view of a state in which a cover unit of a rechargeable battery pack according to a first exemplary embodiment of the present invention is removed, fig. 2 illustrates a schematic plan view of a state in which the cover unit of the rechargeable battery pack of fig. 1 is removed, fig. 3 illustrates a schematic cross-sectional view of a state in which a unit module is fixed by a holder unit according to the first exemplary embodiment of the present invention, fig. 4 illustrates a schematic cross-sectional perspective view of a main portion of the holder unit according to the first exemplary embodiment of the present invention, and fig. 5 illustrates a schematic view of a main portion of a connection state of a first spacer and a second spacer according to the first exemplary embodiment of the present invention.

As shown in fig. 1 to 5, a rechargeable battery pack 100 according to an exemplary embodiment of the present invention includes: a battery case 10 configured to have an accommodation space 11 formed therein; a unit module 20 inserted into the receiving space 11 and formed by connecting a plurality of unit battery cells 21; a holder unit 30 configured to support the unit modules 20 inside the battery case 10; and

bus bars

41 and 61 provided at the upper portion of the holder unit 30 to be connected to electrode terminals of the unit battery cells.

In the present exemplary embodiment, the battery case 10 may have a rectangular parallelepiped shape, and the receiving space 11 may be formed therein. The unit modules 20 may be accommodated in the accommodation spaces 11 of the battery case 10. The battery case 10 may be sealed by using the cover unit 12 (see fig. 11) in a state in which the unit modules 20 are accommodated therein. The coolant input and output unit 14 may be formed in a side surface of the battery case 10.

The unit module 20 may be formed to include two unit battery cells 21 fabricated as rechargeable batteries. The unit cells 21 may be connected to

bus bars

41 and 61, which will be described later.

The unit cell 21 may be formed as a conventional cylindrical rechargeable battery that repeats charge and discharge.

The unit modules 20 may be installed in the following states: the unit modules 20 are supported at the lower surface of the battery case 10 by the holder units 30 while being disposed in a plurality of columns and rows within the battery case 10.

The holder unit 30 may include: a lower holder 31 supporting the plurality of unit modules 20 within the battery case 10 and including a plurality of first spacers 315 disposed between the plurality of unit modules 20; and an upper holder 33 supporting the upper portion of the unit modules 20 and including a plurality of second spacers 335, the plurality of second spacers 335 being detachably coupled to the plurality of first spacers 315 and disposed between the unit modules 20.

The lower holder 31 may include: a first plate 311 on which the unit modules 20 are mounted; a first holder 313 having a first insertion portion 313a into which the unit module 20 is inserted; and a plurality of first spacers 315 disposed between the neighboring unit modules 20 to connect the first plate 311 and the first holder 313.

The first plate 311 is mounted at the lower surface of the receiving space 11 of the battery case 10, and the lower part of the unit module 20 may be located at the upper surface thereof.

The first spacer 315 may protrude from the first plate 311.

Each of the first spacers 315 may protrude to a position between the unit modules 20 by fixing its first end to the first plate 311 and forming its second end having a long length in a direction toward the upper holder 33.

The first spacers 315 may be mounted between the plurality of unit modules 20 while being detachably coupled to the second spacers 335, and thus, they may be mounted to maintain a stable insulation state without voltage interference between the battery cells by stably maintaining an appropriate distance between the unit modules 20.

In addition, the first holder 313 may be connected to a side surface of the first spacer 315 to support a portion of the side surface of the unit module 20.

The first holder 313 may be connected to a side surface of the first spacer 315 at an upper position spaced apart from the first plate 311, and may form a plurality of first insertion portions 313a in which the unit battery cells 21 are inserted.

The first insertion portions 313a are portions into which the unit battery cells 21 constituting the unit module 20 are inserted, and a number of the first insertion portions 313a corresponding to the number of the unit battery cells 21 may be formed in the first holder 313.

The first insertion portions 313a may be formed in a plurality of rows and columns corresponding to the number of the unit battery cells 21 in the first holder 313 so as to stably position the unit battery cells 21 to be disposed inside the battery case 10.

In addition, the upper portion of the unit module 20 may be fixed by an upper holder 33.

The second spacer 335 may protrude from the lower portion of the upper holder 33 to stably support the upper portion of the unit module 20 in a state of being connected to the first spacer 315.

More specifically, the upper holder 33 is located on an upper portion of the unit module 20, and may include: a second plate 331 having a through hole 33a through which a portion of the unit module 20 is exposed; a second holder 333 protruding from the second plate 331 to have a plurality of second insertion portions 333a into which the unit modules 20 are inserted; and a second spacer 335 protruding from the second plate 331 to a position between the adjacent unit modules 20 to be connected to the first spacer 315.

The second plate 331 may be located at the upper portion of the unit module 20, and open through-holes 33a may be formed to expose electrode terminals of the unit battery cells 21 to the outside.

The through-holes 33a may be formed in the second plate 331 in an open state such that the upper portions of the two unit battery cells 21 are partially exposed to the outside together. Thus, through-holes 33a may be formed in the second plate 331 to connect electrode terminals of the unit battery cells 21 by using the bus bars 41 and 61 provided on the second plate 331. This will be described in more detail below when describing the bus bars 41 and 61.

Meanwhile, a second holder 333 may be formed at a lower portion of the second plate 331, the second holder 333 being fixed in a state in which an upper portion of the unit module 20 is inserted.

The second holder 333 protrudes from a lower portion of the second plate 331, and may form a second insertion portion 333a into which an upper portion of the unit battery cell 21 is inserted and fixed.

The second insertion parts 333a are formed in the second holder 333, and more specifically, the number of second insertion parts 333a corresponding to the number of unit battery cells 21 may be formed in the second holder 333. The second insertion part 333a may be formed in the second holder 333 to have a size corresponding to the diameter of the unit battery cell 21.

The second spacer 335 may be installed in the second plate 331 to be supported in a state of being connected to the first spacer 315.

A first end of the second spacer 335 may be connected to the second plate 331 and a second end of the second spacer 335 may be connected to the first spacer 315.

The second spacer 335 may be formed to have a length equal to or similar to that of the first spacer 315, and may be detachably coupled to an upper position of the first spacer 315.

For this, first and

second connection protrusions

315a and 335a, which are in surface contact with each other, may be formed in the first and

second spacers

315 and 335, respectively.

The first connection protrusion 315a may protrude from an upper portion of the first spacer 315 to have a sectional area smaller than that of the first spacer 315 in a width direction thereof.

In addition, the second connecting protrusion 335a may protrude from a lower portion of the second spacer 335 to have a smaller sectional area in a width direction thereof than that of the second spacer 335.

The first and second connecting

protrusions

315a and 335a may protrude from the end of the first spacer 315 and the end of the second spacer 335, respectively, to have the same or similar size, and thus the first and

second spacers

315 and 335 may be fixed to contact each other in a connected state therebetween.

Accordingly, the upper holder 33 and the lower holder 31 may be installed to be stably fixed or detachable with the unit modules 20 therebetween.

Meanwhile, bus bars 41 and 61 connected to electrode terminals of the unit battery cells 21 may be disposed at an upper portion of the second plate 331.

Fig. 6 illustrates a schematic top plan view of a connection state of bus bars in part a of fig. 2, fig. 7 illustrates a schematic view of a main part of the connection state of the bus bars according to the first exemplary embodiment of the present invention, fig. 8 illustrates a schematic top plan view of the first bus bar according to the first exemplary embodiment of the present invention, and fig. 9 illustrates a schematic top plan view of the second bus bar according to the first exemplary embodiment of the present invention.

The bus bars 41 and 61 may be disposed on the second plate 331 to be connected to electrode terminals of the unit battery cells 21.

More specifically, the bus bars 41 and 61 may include: a plurality of first bus bars 41 disposed at opposite edges of an upper side of the second plate 331 to be connected to the electrode terminals; and a plurality of second bus bars 61 disposed on side surfaces of the first bus bars 41 on an upper side of the second plate 331 to be connected to the electrode terminals.

The first bus bars 41 may be installed at opposite edges of the holder unit 30 to be electrically connected to the electrode terminals. That is, the first bus bars 41 may be installed at the first and second sides of the upper side of the holder unit 30, respectively.

Each of the first bus bars 41 may include: a first body portion 411 located on a side surface of the through hole 33a at an opposite edge of an upper side of the second plate 331; and a plurality of first lead portions 413 obliquely protruding from a side surface of the first body portion 411.

The first body portions 411 may be disposed at opposite edges of the second plate 331, and may be disposed on side surfaces of the through holes 33a formed in the first and last columns along opposite edges of the second plate 331.

The first lead part 413 may protrude from a side surface of the first body part 411.

The first lead part 413 may protrude from a side surface of the first body part 411 to be located between the through holes 33 a.

The first lead part 413 may obliquely protrude from a side surface of the first body part 411. More specifically, the first lead part 413 may obliquely protrude from the side surface of the first body part 411 at an angle ranging from 45 degrees to 60 degrees.

Thus, the first lead part 413 may be obliquely protruded from the side surface of the first body part 411 to ensure stable connection without interference between components in connecting the bus bar to the electrode terminal at the upper side of the second plate 331.

The first lead part 413 may protrude from a side surface of the first body part 411, and may protrude to be inserted to a position between every two through holes 33a among the through holes 33a formed in and between the first and last rows along an edge of the second plate 331. Here, the through hole 33a may be formed in a slit shape passing through the upper side of the second plate 331 at an inclination angle corresponding to the inclination angle of the first lead portion 413.

The first lead parts 413 may protrude from the side surface of the first body part 411 such that they are inserted between every two through holes 33a among the through holes 33a formed in and between the first and last rows. This is for inserting the second lead portions 613a of the second bus bars 61 positioned adjacent to the first bus bars 41 between the through holes 33a in an alternating state.

The first lead part 413 may be connected to the unit module 20 through the wire member 50 in a state of being located between the through holes 33 a.

The lead member 50 may be connected between the first lead part 413 and the unit modules 20 at an upper side of the second plate 331, and may be electrically connected to the electrode terminal while stably maintaining the mounted state of the unit modules 20.

The wire member 50 may be partially bent in the length direction while connecting the unit modules 20 and the first bus bar 41. This is to prevent interference between adjacent components in the process of connecting the unit modules 20 and the first bus bar 41 by using the wire member 50.

Thus, the lead member 50 may electrically connect the bus bars 41 and 61 with the electrode terminals while stably maintaining the mounted state of the unit modules 20.

Meanwhile, the second bus bars 61 may be disposed between the first bus bars 41 in the second plate 331.

The second bus bar 61 may be disposed between the first bus bars 41 disposed at the first and second edges of the second plate 331.

That is, the second bus bar 61 may be disposed at a position between columns in the through-holes 33a formed in a plurality of columns and a plurality of rows.

More specifically, the second bus bar 61 may include: a second body portion 611 positioned at a position between the through holes 33a of the second plate 331, having a long length in the first direction; and a composite lead portion 613 obliquely protruding from an opposite side of the second body portion 611 in a second direction crossing the first direction.

The plurality of second body portions 611 may be formed to have the same or similar length as the first body portions 411, and may be arranged at equal intervals in the first direction at positions between the through holes 33a at positions between the pair of first body portions 411 provided at opposite edges of the second plate 331.

The composite lead portion 613 may obliquely protrude from a side surface of the second body portion 611.

The composite lead portion 613 may include: a plurality of second lead portions 613a obliquely protruding from a first side of the second body portion 611 in a second direction crossing the first direction; and a plurality of third lead portions 613b obliquely protruding from a second side of the second body portion 611 in a direction opposite to the second direction. The composite lead portions 613 may protrude from respective opposite sides of the second body portion 611 to be inserted into positions between a plurality of rows among the through holes 33a formed in a plurality of columns and rows on the upper side of the second plate 331.

The second lead part 613a may protrude from the first side of the second body part 611 in a second direction crossing the first direction to be located between the through holes 33 a.

More specifically, the second lead portion 613a may obliquely protrude from the side surface of the second body portion 611 in the range of an angle α of 45 to 60 degrees. That is, the second lead part 613a may protrude from the side surface of the second body part 611 at the same angle by the same or similar length as that of the first lead part 413 of the first bus bar 41.

Thus, the second lead part 613a may be obliquely protruded from the side surface of the second body part 611 to ensure stable connection without interference between components in connecting the bus bar to the electrode terminal at the upper side of the second plate 331.

The second lead part 613a may protrude from a side surface of the second body part 611, and may protrude so as to be inserted into a position between through holes 33a formed between a pair of first bus bars 41 disposed at opposite edges of the upper side of the second plate 331.

The second lead part 613a may protrude from a side surface of the second body part 611 such that the second lead part 613a is inserted to a position between every two through holes 33a among the through holes 33a formed between the first and last rows.

This is for inserting the second lead portions 613a of the secondary bus bars 61 located near the secondary bus bars 61 into positions between the through holes 33a in an alternating state.

Meanwhile, the third lead portion 613b may protrude from the second side of the second body portion 611.

The third lead portion 613b may protrude from an opposite side surface of the second body portion 611 from which the second lead portion 613a protrudes.

The third lead part 613b may protrude from a side surface of the second body part 611 at the same inclination angle as that of the second lead part 613 a. That is, the third lead part 613b is formed in line with the second lead part 613a with the second body part 611 interposed therebetween, and the third lead part 613b may protrude from a side surface of the second body part 611.

The composite lead portion 613 may be connected to the unit module 20 through the wire member 50 in a state of being located between the through holes 33 a.

The lead member 50 may be connected between the unit module 20 and each of the second and third

lead parts

613a and 613b from the upper side of the holder unit 30, and may be electrically connected to the electrode terminals of the unit module 20 while stably maintaining the mounted state of the unit module 20.

In this way, the lead member 50 may electrically connect the bus bar and the electrode terminal while stably maintaining the mounted state of the unit modules 20.

Meanwhile, the guide protrusion 70 may protrude from the through hole 33 a.

The guide protrusion 70 protruding upward from the open edge of the through-hole 33a may protrude in a rounded shape corresponding to the elongated shape of the through-hole 33 a. Therefore, the guide protrusion 70 is formed to protrude from each through hole 33a, and thus it is possible to stably guide the positions of the bus bars 41 and 61 disposed between the through holes 33 a.

Meanwhile, the stopper protrusion 80 fixing the positions of the bus bars 41 and 61 may protrude from the second plate 331. A pair of stop protrusions 80 may protrude from an upper side of the second plate 331.

Fig. 10 is a schematic view showing a main portion of a connected state of a first spacer and a second spacer according to a second exemplary embodiment of the present invention. The same reference numerals as those of fig. 1 to 9 denote the same or similar members having the same or similar functions. Hereinafter, detailed description of the same reference numerals will be omitted.

As shown in fig. 10, in the rechargeable battery pack according to the second exemplary embodiment of the present invention, the insertion groove 315b may be recessed from the end of the first spacer 315, and the insertion protrusion 335b may be formed at the end of the second spacer 335.

Accordingly, the first spacer 315 and the second spacer 335 may be connected in a state where the insertion protrusion 335b is inserted into the insertion groove 315b, and thus, the first spacer 315 and the second spacer 335 may be more stably connected in a detachable state.

Fig. 11 illustrates a schematic perspective view showing a stacked state of a rechargeable battery pack according to a third exemplary embodiment of the present invention. The same reference numerals as those of fig. 1 to 10 denote the same or similar members having the same or similar functions. Hereinafter, detailed description of the same reference numerals will be omitted.

The above rechargeable battery packs 100 may be stacked in the vertical direction with the same size.

That is, referring to fig. 11, according to the third exemplary embodiment of the present invention, rechargeable battery packs 300 may be stacked in a vertical direction such that receiving spaces 11 may form multiple stages in the vertical direction, and unit modules fixed to holder units 30 may be mounted in each receiving space 11. Here, each of the receiving spaces 11 may be formed to have the same size in the vertical direction of the battery case 10.

Further, the coolant input and output unit 14 may be mounted in each accommodation space 11 on a side surface of the battery case 10.

Further, in the rechargeable battery pack 300 of the third exemplary embodiment, a connection terminal (not shown) electrically connected to the bus bar may be mounted in each of the rechargeable battery packs stacked in multiple stages.

Accordingly, the rechargeable battery packs 300 stacked in multiple stages may be electrically connected through the connection terminals.

As described above, the rechargeable battery pack 300 of the present exemplary embodiment is formed in a multi-layered structure having the same size corresponding to the battery capacity, thereby realizing various battery capacities.

Fig. 12 shows a schematic perspective view of a stacked state of a rechargeable battery pack according to a fourth exemplary embodiment of the present invention. The same reference numerals as those of fig. 1 to 11 denote the same or similar members having the same or similar functions. Hereinafter, detailed description of the same reference numerals will be omitted.

As shown in fig. 12, in a rechargeable battery pack 400 according to a fourth exemplary embodiment of the present invention, the above rechargeable battery packs 100 may be stacked to have different sizes in a vertical direction.

That is, according to the fourth exemplary embodiment of the present invention, the rechargeable battery packs 400 may be stacked to have different sizes in the vertical direction, so that the receiving spaces 11 may be formed in multiple stages in the vertical direction, and the unit modules fixed to the holder unit 30 may be mounted in each receiving space 11.

Here, each of the receiving spaces 11 may be formed to have a different size in the vertical direction of the battery case 10.

That is, since the rechargeable battery pack 400 of the fourth exemplary embodiment is formed in a multi-stage stacking type having a size that is reduced in an upward direction, the degree of freedom of installation may be improved.

Further, in the rechargeable battery pack 400 of the fourth exemplary embodiment, a connection terminal (not shown) electrically connected to the bus bar may be mounted in each of the rechargeable battery packs stacked in multiple stages.

Accordingly, the rechargeable battery packs 400 stacked in multiple stages may be electrically connected through the connection terminals.

While the invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

< description of symbols >

10 battery case 11 accommodating space

20-unit module 21-unit battery cell

30 holder unit 31 lower holder

311 first plate 313 first holder

313a first insertion portion 315 first spacer

33 upper holder 331 second plate

333 second holder 333a second insertion portion

33a through hole 335 second spacer

41 first bus bar 411 first body portion

413 first lead portion 50 wire member

61 second bus bar 611 second body portion

613 composite lead portion 613a and a second lead portion

613b third lead part 70 guide projection

80 stop protrusion 315b is inserted into the groove

335b insertion projection

Claims

1. A rechargeable battery pack, comprising:

a battery case configured to have an accommodation space formed therein;

a plurality of unit modules inserted into the receiving space and each formed by connecting a plurality of unit battery cells;

a holder unit configured to support the unit modules inside the battery case; and

a bus bar disposed at an upper portion of the holder unit and connected to electrode terminals of the unit battery cells,

wherein the holder unit includes:

a lower holder configured to support the unit modules in the battery case and including a plurality of first spacers disposed between the unit modules; and

an upper holder configured to support upper portions of the unit modules, detachably connected to the first spacer, and including a plurality of second spacers disposed between the unit modules.

2. The rechargeable battery pack according to claim 1, wherein

A plurality of through-holes are formed at an upper side of the second plate to expose the electrode terminals of the unit cells, an

The plurality of through holes form a plurality of columns and a plurality of rows at an upper side of the second plate.

3. The rechargeable battery pack according to claim 1, wherein

The lower holder includes:

a first plate configured to mount the unit modules thereon;

a first holder configured to have a first insertion portion into which the unit modules are inserted; and

a first spacer configured to connect the first plate and the first holder and disposed between the unit modules.

4. The rechargeable battery pack according to claim 3, wherein

The upper holder includes:

a second plate disposed at an upper portion of the unit module to have a through-hole through which a portion of the unit module is exposed;

a second holder drawn out from a lower portion of the second plate to have a second insertion portion into which the unit module is inserted; and

a second spacer configured to protrude from the lower portion of the second plate, disposed between the unit modules, and connected to the first spacer.

5. The rechargeable battery pack according to claim 4, wherein

The first spacer and the second spacer are detachably connected.

6. The rechargeable battery pack according to claim 5, wherein

A first connecting protrusion protruding from an end of the first spacer, a second connecting protrusion protruding from an end of the second spacer, an

The first coupling protrusion and the second coupling protrusion are in surface contact in a state where the first spacer and the second spacer are coupled.

7. The rechargeable battery pack according to claim 5, wherein

An insertion groove is formed at an end of the first spacer, an insertion protrusion protrudes from an end of the second spacer, an

The insertion protrusion is inserted into the insertion groove when the first spacer and the second spacer are connected.

8. The rechargeable battery pack according to claim 5, wherein

A guide protrusion for guiding a mounted state of the bus bar protrudes from the second plate.

9. The rechargeable battery pack according to claim 8, wherein

The guide protrusion protrudes to have a rounded shape along the through-hole to guide an arrangement state of the bus bar.

10. The rechargeable battery pack according to claim 9, wherein

The bus bar includes:

a plurality of first bus bars disposed at an edge of an upper side of the second plate and connected to the electrode terminals; and

a plurality of second bus bars disposed on side surfaces of the first bus bars at an upper side of the holder unit to be connected to the electrode terminals.

11. The rechargeable battery pack according to claim 10, wherein

The first bus bar includes:

a first body portion provided on a side surface of the through-hole to have a long length in a first direction at the edge of the upper side of the second plate; and

a plurality of first lead portions configured to obliquely protrude from a side surface of the first body portion in a second direction crossing the first direction.

12. The rechargeable battery pack according to claim 11, wherein

The first lead portion is disposed between the through holes.

13. The rechargeable battery pack according to claim 12, wherein

The first lead portion obliquely protrudes from the side surface of the first body portion at an angle in a range of 45 degrees to 60 degrees.

14. The rechargeable battery pack according to claim 13, wherein

The first bus bar and the unit module are electrically connected to each other by a wire member on an upper side of the holder unit.

15. The rechargeable battery pack according to claim 14, wherein

A stopper protrusion limiting movement of the bus bar protrudes from a surface of the second plate.