Battery pack

Abstract

The present invention relates to a battery pack for accommodating cell assemblies that include a pair of external terminals, the battery pack comprising a pack case on which the cell assemblies are seated, wherein the pack case includes: a base plate supporting the bottom of the plurality of cell assemblies; and a protective cap coupled to the central portion of the base plate, the protective cap covering an external terminal of each accommodated cell assembly.

Description

battery pack

[0001] The present invention relates to a battery pack accommodating a plurality of cell assemblies including a pair of external terminals.

[0002] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2024-0039923, filed March 22, 2024, the entire contents of which are incorporated herein by reference.

[0003]

[0004] Battery packs used in electric vehicles and other applications typically have a structure in which multiple cell assemblies, each containing a plurality of secondary batteries, are connected in series or parallel to achieve high output. Furthermore, these secondary batteries enable repeated charging and discharging through electrochemical reactions between components, including electrodes, separators, and electrolytes.

[0005] Fig. 1 is a perspective view of a conventional battery pack, wherein the battery pack is composed of a plurality of cell assemblies (10) and a pack case (20) capable of accommodating the cell assemblies (10).

[0006] The above cell assembly (10) includes a pair of external terminals, and each cell assembly (10) is electrically connected through a separate bus bar connecting the external terminals.

[0007] Meanwhile, if a short circuit occurs within one of the cell assemblies (10) housed in the pack case (20), a spark accompanied by high heat may occur. At this time, if the spark discharge or the like is scattered and contacts the bus bar, a short circuit may occur in a large number of cell assemblies (10) in an instant, which may lead to a large explosion or fire.

[0008] In particular, since the cell assemblies (10) accommodated in most battery packs are arranged with their external terminals facing the center of the pack case (20), there is a high possibility that the bus bars will come into contact with the flying spark particles. In other words, since conventional battery packs have a structure in which the bus bars are gathered at the center, they are vulnerable to a large fire if sparks or flames occur due to a short circuit.

[0009]

[0010] (Prior art document) Korean Patent Publication No. 10-2022-0001228

[0011]

[0012] Accordingly, the present invention has been created to solve the above problems, and aims to provide a battery pack having a configuration that can prevent flying sparks from coming into contact with bus bars and wires.

[0013] Other objects and advantages of the present invention can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0014] According to the present invention, a battery pack is provided that accommodates a cell assembly including a pair of external terminals.

[0015] The battery pack includes a pack case in which a cell assembly is mounted; the pack case includes a base plate supporting a lower portion of the cell assembly; and a protective cap coupled to a central portion of the base plate; wherein the protective cap is characterized in that it covers an external terminal of each cell assembly accommodated therein.

[0016] The above protective cap may be formed to extend across the center of the base plate and along the length of the pack case.

[0017] The plurality of cell assemblies may be arranged symmetrically with respect to the width direction of the pack case and along the length direction of the pack case, and the protective cap may be provided to cover the space between the pair of spaced cell assemblies.

[0018] The cell assemblies forming the pair are positioned spaced apart from each other so that the sides where the external terminals are located face each other, and the protective cap may be provided to cover the upper portion of the external terminal of the cell assemblies.

[0019] The above protective cap may include a material having at least one of heat resistance and fire resistance.

[0020] The above pack case further includes a connecting bus bar for electrically connecting a pair of adjacently arranged cell assemblies, both ends of the connecting bus bar being connected to external terminals included in each cell assembly, and the protective cap can cover the upper portion of the connecting bus bar.

[0021] The above pack case further includes a busbar cap formed to correspond to the shape of the connecting busbar and covering the upper portion of the connecting busbar, and the protective cap can cover the upper portion of the busbar cap.

[0022] The above pack case further includes a covering member positioned between the connecting bus bar and the bus bar cap to cover the upper portion of the connecting bus bar, and the covering member may include a material having insulating properties.

[0023] The above base plate includes protrusions spaced apart at predetermined intervals along the center of the pack case, and the protective cap can be fixed by being combined with the protrusions.

[0024] The upper height of the above protrusion may be at least higher than the height of the external terminal of the above cell assembly.

[0025] The protective cap includes an insertion opening corresponding to the position of the protrusion, and the protective cap can be coupled to the base plate such that the protrusion is inserted into the insertion opening.

[0026] The above protrusion includes a coupling groove at the top, and the protective cap further includes a lower protrusion that protrudes downward corresponding to the position of the protrusion and has a diameter that can be inserted into the coupling groove, and the protective cap can be coupled to the base plate by having the lower protrusion inserted into the coupling groove.

[0027] The pack case includes a center beam extending across the center and coupled to the base plate, the plurality of cell assemblies are arranged symmetrically with respect to the center beam and along the length of the pack case, and the protective cap can be coupled to an upper end of the center beam.

[0028] The above cell assembly includes a cell stack in which a plurality of cells from which electrode leads are derived are stacked; and an end plate coupled to the front and rear surfaces of the cell stack; wherein the external terminal is formed on the end plate coupled at a position corresponding to the electrode leads and can be electrically connected to the electrode leads.

[0029] The above cell assembly may further include a module frame surrounding the perimeter of the cell stack and coupled to the end plate.

[0030] The module frame includes a lower frame supporting the lower portion of the cell stack; an upper frame supporting the upper portion of the cell stack; and a pair of side frames supporting both sides of the cell stack; and the upper frame may include a plurality of opening holes.

[0031]

[0032] According to the present invention, the phenomenon of the bus bar directly contacting a spark discharge can be prevented by using a protective cap configuration that covers the bus bar and the conductor, etc.

[0033] Figure 1 is a perspective view of a conventional battery pack.

[0034] Figure 2 is a perspective view of a battery pack according to the first embodiment of the present invention.

[0035] Figure 3 is a perspective view of the battery pack of Figure 2 with the protective cap removed.

[0036] Figure 4 is a plan view of the battery pack of Figures 2 and 3.

[0037] Figure 5 is a perspective view of a cell assembly.

[0038] Figure 6 is a perspective view of the connecting bus bar and protective cap.

[0039] Figure 7 is a perspective view of a battery pack according to a second embodiment of the present invention.

[0040] Figure 8 is a perspective view of a connecting busbar, a busbar cap, and a protective cap.

[0041] Figure 9 is a perspective view of a battery pack according to a third embodiment of the present invention.

[0042] Fig. 10 is a plan view of the battery pack of Fig. 9.

[0043] Fig. 11 is a perspective view of a battery pack according to a fourth embodiment of the present invention.

[0044] Figure 12 is a perspective view of the battery pack of Figure 11 with the protective cap removed.

[0045] Fig. 13 is a perspective view of a battery pack according to a fifth embodiment of the present invention.

[0046] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concept of a term to best explain his or her invention, they should be construed as meanings and concepts consistent with the technical spirit of the present invention.

[0047] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0048] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0049] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0050]

[0051] The present invention relates to a battery pack accommodating a plurality of cell assemblies including a pair of external terminals.

[0052] FIGS. 2 to 6 relate to a battery pack according to a first embodiment of the present invention, FIGS. 7 to 8 relate to a battery pack according to a second embodiment of the present invention, FIGS. 9 to 10 relate to a battery pack according to a third embodiment of the present invention, FIGS. 11 to 12 relate to a battery pack according to a fourth embodiment of the present invention, and FIG. 13 relates to a battery pack according to a fifth embodiment of the present invention.

[0053] Hereinafter, specific embodiments of the battery pack of the present invention will be described in detail with reference to the attached drawings. Note that the directions used in the following description to designate relative positions, such as front-back, up-down, left-right, etc., are intended to aid understanding of the invention, and unless otherwise specified, the directions depicted in the drawings will be used as a reference.

[0054]

[0055] Here, the width direction of the cell assembly refers to the direction in which the cells are stacked, and the length direction of the cell assembly refers to the direction orthogonal to the width direction of the cell assembly, i.e., the direction connecting the two sides where the end plates are joined.

[0056] In addition, the width direction (D2) of the pack case refers to the length direction of the cell assembly accommodated in the pack case, and the length direction (D1) of the pack case refers to the width direction of the cell assembly accommodated in the pack case.

[0057]

[0058] (First embodiment)

[0059] FIG. 2 is a perspective view of a battery pack (1) according to a first embodiment of the present invention, FIG. 3 is a perspective view of the battery pack (1) of FIG. 2 with the protective cap (400) separated, FIG. 4 is a plan view of the battery pack (1) of FIGS. 2 and 3, and FIG. 5 is a perspective view of a cell assembly (100).

[0060]

[0061] The battery pack (1) of the present invention includes a pack case (1000) in which a cell assembly (100) is mounted.

[0062] In addition, the battery pack (1) of the present invention may further include an upper case (not shown) that is coupled with the pack case (1000) to cover the upper portion of the cell assembly (100) accommodated in the pack case (1000). However, since the upper case deviates from the characteristics of the present invention, a detailed description thereof will be omitted.

[0063]

[0064] The above cell assembly (100) includes a cell stack in which a plurality of cells (not shown) from which electrode leads are derived are stacked in one direction.

[0065] Each of the above cells includes an electrode assembly in which electrodes and separators are alternately laminated, an electrode lead connected to the electrode, a case enclosing the electrode assembly so that the electrode lead extends to the outside, and an electrolyte filled together with the electrode assembly within the case.

[0066] The above electrode may be a positive electrode having a slurry of a positive electrode active material, a binder resin, a conductive agent, and other additives applied to at least one surface of a current collector, or a negative electrode having a slurry of a negative electrode active material, a binder resin, a conductive agent, and other additives applied to at least one surface of a current collector. Accordingly, the electrode assembly is configured by alternately stacking a positive electrode, a separator, and a negative electrode.

[0067] The positive electrode active material may include a lithium-containing transition metal oxide, and the negative electrode active material may include lithium metal, carbon material, and metal compound or a mixture thereof capable of absorbing and releasing lithium ions.

[0068] The above separator can be a conventional porous polymer film used in lithium secondary batteries.

[0069] The above case is a sheet material processed into a predetermined shape. At this time, the sheet material is composed of a multilayer structure in which an outermost outer resin layer made of an insulating material such as polyethylene terephthalate (PET) or nylon, a metal layer made of aluminum that maintains mechanical strength and prevents the penetration of moisture and oxygen, and an inner resin layer made of a polyolefin-based material that has thermal adhesive properties and acts as a sealant are laminated.

[0070] The sheet material forming the case may have a predetermined adhesive resin layer interposed between the inner resin layer and the metal layer, and between the outer resin layer and the metal layer, as needed. The adhesive resin layer is formed as a single layer or multiple layers for smooth adhesion between different materials, and the material is typically a polyolefin resin, or a polyurethane resin may be used for smooth processing, and a mixture of these may also be employed.

[0071] The above cell can be classified into square, pouch-shaped, and cylindrical shapes depending on the shape of the electrode assembly and case. However, in the detailed description and drawings of the present invention, a pouch-shaped cell is used as an example for convenience of understanding.

[0072] End plates (110) configured to protect and support the cell stack may be coupled to the front and rear of the cell stack.

[0073] The above cell assembly (100) further includes an external terminal (111) electrically connected to the electrode lead derived from the cell stack.

[0074] The above external terminal (111) is formed on the end plate (110), and is formed so that one end is exposed to the outside of the end plate (110).

[0075] Specifically, the external terminal (111) is formed on an end plate (110) that is joined at a position corresponding to the electrode lead of the cell stack among a pair of end plates (110) located on the front and rear sides of the cell assembly (100).

[0076] Referring to FIGS. 3 to 5, an external terminal (111) is formed on an end plate (110) located on the front of the cell assembly (100).

[0077] The above cell assembly (100) further includes a module frame that surrounds the perimeter of the cell stack and is coupled to the end plate (110), as shown in FIG. 5.

[0078] The above module frame includes a lower frame (not shown) that supports the lower portion of the cell stack, an upper frame (120) that supports the upper portion of the cell stack, and a pair of side frames (130) that support both sides of the cell stack.

[0079] As illustrated in FIG. 5, the upper frame (120) of the present invention includes an opening hole (121) that is opened so that gas, flames, spark particles, etc. can be quickly discharged when a thermal runaway phenomenon occurs inside the cell assembly (100) due to a short circuit or the like. Accordingly, when the cell stack wrapped by the module frame undergoes a thermal runaway, gas, spark particles, etc. can be discharged upward through the opening hole (121).

[0080] A plurality of cell assemblies (100) are arranged symmetrically with respect to the width direction (D2) of the pack case (1000) and along the length direction (D1) of the pack case (1000). Specifically, each cell assembly (100) is arranged such that the external terminal (111) faces the center of the pack case (1000), as illustrated in FIGS. 3 and 4. At this time, a pair of cell assemblies (100) that are symmetrical with respect to each other are arranged at a predetermined interval, so that an empty space is formed in the center of the pack case (1000), as illustrated in FIGS. 3 and 4.

[0081] The above empty space may also contain wires, etc.

[0082]

[0083] The above pack case (1000) further includes a connecting bus bar (200) that electrically connects a pair of adjacently arranged cell assemblies (100).

[0084] Referring to FIGS. 3 and 4, both ends of one connecting bus bar (200) located between a pair of cell assemblies (100) are connected to one external terminal (111) included in each cell assembly (100).

[0085] Each of the above cell assemblies (100) is arranged so that all external terminals (111) face the center of the pack case (1000). Accordingly, the connecting bus bar (200) is also located in the center area of ​​the pack case (1000).

[0086] In some embodiments, the pack case (1000) may further include a covering member covering the upper portion of the bus bar.

[0087] The above covering member includes a material having insulating properties and serves to insulate a portion of the connecting bus bar (200) from short circuits and short circuits.

[0088] Since the above covering member must cover and insulate the entire upper portion of the connecting bus bar (200), it is formed to correspond to the shape of the connecting bus bar (200).

[0089]

[0090] The pack case (1000) of the present invention includes a plate-shaped base plate that supports the lower portion of the cell assembly (100) and a side beam (700) that is coupled to the base plate along an edge of the base plate to support the side portion of the cell assembly (100) mounted on the base plate.

[0091] In some embodiments, the battery pack (1) may further include a cross beam (800) interposed between a pair of cell assemblies (100) arranged adjacently with respect to the longitudinal direction (D1) of the pack case (1000) as illustrated in FIGS. 2 to 4 to separate each cell assembly (100).

[0092] The above cross beam (800) may serve to separate the sides of each cell assembly (100) from each other, or may serve to support the sides of each cell assembly (100).

[0093]

[0094] The pack case (1000) of the present invention further includes a protective cap (400) coupled to the center of the base plate.

[0095] The above protective cap (400) serves to cover and protect a portion of the internal space of the pack case (1000).

[0096] The above protective cap (400) covers the space between the pair of spaced cell assemblies (100) at the center of the base plate as shown in FIGS. 2 to 4.

[0097] Figure 6 is a perspective view of a connecting bus bar (200) and a protective cap (400).

[0098] The above protective cap (400) covers the space between the cell assemblies (100) as shown in FIGS. 2, 3, 4 and 6, and at the same time covers and protects the external terminal (111) of each cell assembly (100).

[0099]

[0100] The above protective cap (400) is provided to cover both the external terminal (111) of the cell assembly (100) and the connecting bus bar (200) connecting the external terminal (111), as shown in FIG. 4.

[0101] The above protective cap (400) is formed to extend across the center of the base plate and along the longitudinal direction (D1) of the pack case (1000), as shown in FIGS. 2 and 3.

[0102] For example, the protective cap (400) protects the external terminal (111) of each cell assembly (100) located below the protective cap (400) from flying spark particles, flames, high-temperature gases, etc.

[0103] The above protective cap (400) includes a material having at least one of heat resistance and fire resistance. For example, the above protective cap (400) may include mica.

[0104] In addition, the protective cap (400) may further include an insulating material. For example, the protective cap (400) may further include glass fiber.

[0105]

[0106] *

[0107] The battery pack (1) of the present invention can minimize the impact on other cell assemblies (100) even if one cell assembly (100) explodes or generates sparks due to an internal short circuit or the like, or if flying products such as spark particles are generated, through the configuration of a protective cap (400) that covers the upper portion of the connecting bus bar (200).

[0108] In addition, the battery pack (1) of the present invention can simultaneously protect the external terminal (111) and connection bus bar (200) of each cell assembly (100) through the protective cap (400), as well as the wires that can be installed in the center of the pack case (1000).

[0109]

[0110] (Second embodiment)

[0111] Fig. 7 is a perspective view of a battery pack (1) according to a second embodiment of the present invention, and Fig. 8 is a perspective view of a connecting bus bar (200), a bus bar cap (300), and a protective cap (400).

[0112] The pack case (1000) included in the battery pack (1) according to the second embodiment of the present invention further includes a busbar cap (300).

[0113] The above busbar cap (300) is formed to correspond to the shape of the connecting busbar (200) and covers the upper portion of the connecting busbar (200) as shown in FIGS. 7 and 8.

[0114] The above busbar cap (300) covers the connecting busbar (200) to protect the connecting busbar (200) from spark particles, flames, and high-temperature gases approaching from the outside. Therefore, the busbar cap (300) includes a material having at least one of heat resistance and fire resistance. For example, the busbar cap (300) may include mica.

[0115] The above protective cap (400) covers and protects the upper portion of the external terminal (111), the connecting bus bar (200) connecting the external terminal (111), and the bus bar cap (300) protecting the connecting bus bar (200), as shown in FIGS. 7 and 8.

[0116] In some embodiments, the pack case (1000) may further include a covering member positioned between the connecting bus bar (200) and the bus bar cap (300) to cover the upper portion of the connecting bus bar (200).

[0117]

[0118] (Embodiment 3)

[0119] Fig. 9 is a perspective view of a battery pack (1) according to a third embodiment of the present invention, and Fig. 10 is a plan view of the battery pack (1) of Fig. 9.

[0120] The pack case (1000) included in the battery pack (1) according to the third embodiment of the present invention further includes a center beam (500).

[0121] The above center beam (500) is interposed in the empty space between the cell assemblies (100) spaced apart at a predetermined interval in the width direction (D2) of the pack case (1000) and serves to separate each cell assembly (100).

[0122] The center beam (500) extends across the center of the pack case (1000) as illustrated in FIGS. 9 and 10 and is coupled to the base plate. Accordingly, a plurality of cell assemblies (100) are symmetrical with respect to the center beam (500) in the width direction (D2) of the pack case (1000) and are arranged along the length direction (D1) of the pack case (1000).

[0123] In some embodiments, the center beam (500) may be manufactured in a hollow shape to serve as a passage for gas to move inside.

[0124] According to some other embodiments, the center beam (500) may be manufactured in a hollow shape and may include wires or the like inside.

[0125] The above protective cap (400) can be coupled to the upper end of the center beam (500) to protect the external terminal (111), the connecting bus bar (200), and the center beam (500).

[0126] Additionally, the above protective cap (400) can protect the busbar cap (300) located on the upper portion of the connecting busbar (200) as shown in FIGS. 9 and 10.

[0127]

[0128] (Embodiment 4)

[0129] Fig. 11 is a perspective view of a battery pack (1) according to a fourth embodiment of the present invention, and Fig. 12 is a perspective view of the battery pack (1) of Fig. 11 with the protective cap (400) separated.

[0130] The pack case (1000) included in the battery pack (1) according to the third embodiment of the present invention further includes a protrusion (600).

[0131] The above protrusions (600) are spaced apart at predetermined intervals along the center of the pack case (1000) as shown in FIGS. 11 and 12.

[0132] The protective cap (400) of the present invention can be fixed by being combined with the protrusion (600) protruding upward from the base plate.

[0133] The above protective cap (400) includes an insertion hole (410) opened corresponding to the position of the protrusion (600), and the protective cap (400) is coupled with the base plate so that the protrusion (600) is inserted into the insertion hole (410) as shown in FIG. 11.

[0134] It is preferable that the above protrusion (600) has a height that can be inserted into the insertion hole (410) of the protective cap (400) that covers the external terminal (111) and the connecting bus bar (200) of the cell assembly (100). Therefore, the upper height of the protrusion (600) is at least higher than the height of the external terminal (111) of the cell assembly (100) accommodated in the pack case (1000).

[0135] Additionally, in some embodiments, when the battery pack (1) has a busbar cap (300) applied, the upper height of the protrusion (600) is at least higher than the height of the busbar cap (300).

[0136] The above protrusion (600) is inserted into the insertion hole (410) of the above protective cap (400), thereby restricting horizontal movement of the above protective cap (400). Accordingly, the above protective cap (400) can be stably fixed to the central position of the pack case (1000) without horizontal shaking.

[0137]

[0138] (Embodiment 5)

[0139] Fig. 13 is a perspective view of a battery pack (1) according to a fifth embodiment of the present invention.

[0140] The pack case (1000) included in the battery pack (1) according to the fifth embodiment of the present invention further includes a protrusion (600). In addition, the protective cap (400) further includes a lower protrusion (420) formed at a position corresponding to the protrusion (600).

[0141] The above protrusion (600) includes a joining groove (610) at the top as shown in FIG. 13, and the lower protrusion (420) protrudes downward corresponding to the position of the protrusion (600).

[0142] The above protective cap (400) is coupled with the base plate by inserting the lower protrusion (420) into the coupling groove (610) of the protrusion (600).

[0143] The shape of the above lower protrusion (420) corresponds to the shape of the above joining groove (610).

[0144] In addition, it is preferable that the diameter of the lower protrusion (420) has a size that can be inserted into the joining groove (610).

[0145] The lower protrusion (420) can be regulated from moving in the horizontal direction by being inserted into the joining groove (610) of the protrusion (600). That is, the protective cap (400) can be stably fixed to the central position of the pack case (1000) without shaking in the horizontal direction.

[0146]

[0147] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

[0148]

[0149] (Explanation of symbols)

[0150] 10: (Prior art) Cell assembly

[0151] 20: (Prior art) Pack case

[0152] 1: Battery pack

[0153] 1000: Pack Case

[0154] 100: Cell assembly

[0155] 110: End Plate

[0156] 111: External terminal

[0157] 120: Upper frame

[0158] 121: Opening hole

[0159] 130: Side frame

[0160] 200: Connecting busbar

[0161] 300: Busbar Cap

[0162] 400: Protective cap

[0163] 410: Insertion port

[0164] 420: Lower protrusion

[0165] 500: Center beam

[0166] 600: Protrusion

[0167] 610: Combination Home

[0168] 700: Side beam

[0169] 800: Cross beam

[0170] D1: Pack case length direction

[0171] D2: Pack case width direction

Claims

1. A battery pack accommodating a cell assembly including a pair of external terminals, a pack case in which the cell assembly is mounted; The above pack case is, a base plate supporting the lower portion of the cell assembly; and A protective cap coupled to the center of the base plate; A battery pack characterized in that the above protective cap covers the external terminal of each cell assembly received.

2. In paragraph 1, A battery pack in which the above protective cap is formed to extend across the center of the base plate and along the length of the pack case.

3. In paragraph 1, The above plurality of cell assemblies are arranged symmetrically with respect to the width direction of the pack case and along the length direction of the pack case, A battery pack wherein the above protective cap is provided to cover the space between the pair of spaced cell assemblies.

4. In paragraph 1, The above pair of cell assemblies are positioned spaced apart from each other so that the sides where the external terminals are located face each other, A battery pack wherein the above protective cap is provided to cover the upper portion of the external terminal of the above cell assembly.

5. In paragraph 1, A battery pack wherein the above protective cap includes a material having at least one of heat resistance and fire resistance.

6. In paragraph 1, The above pack case is, Further comprising a connecting busbar electrically connecting a pair of adjacently arranged cell assemblies, Both ends of the above connecting bus bar are connected to external terminals included in each cell assembly, The above protective cap is a battery pack that covers the upper part of the above connecting bus bar.

7. In paragraph 6, The above pack case is, It further includes a busbar cap that is formed to correspond to the shape of the above connecting busbar and covers the upper part of the above connecting busbar, The above protective cap is a battery pack that covers the upper part of the above bus bar cap.

8. In paragraph 7, The above pack case further includes a covering member positioned between the connecting bus bar and the bus bar cap to cover the upper portion of the connecting bus bar, A battery pack in which the above covering member includes a material having insulating properties.

9. In paragraph 1, The above base plate, It includes protrusions spaced at regular intervals along the center of the pack case, A battery pack in which the above protective cap is fixed by being combined with the above protrusion.

10. In paragraph 9, A battery pack wherein the upper height of the above protrusion is at least higher than the height of the external terminal of the above cell assembly.

11. In paragraph 9, The above protective cap includes an insertion hole opened corresponding to the position of the protrusion, The above protective cap is a battery pack that is coupled to the base plate so that the protrusion is inserted into the insertion hole.

12. In paragraph 9, The above protrusion includes a joining groove at the top, The above protective cap further includes a lower protrusion that protrudes downward corresponding to the position of the protrusion and has a diameter that can be inserted into the coupling groove, A battery pack in which the protective cap is coupled to the base plate such that the lower protrusion is inserted into the coupling groove.

13. In paragraph 1, The pack case includes a center beam extending across the center and coupled to the base plate, The above plurality of cell assemblies are arranged symmetrically with respect to the center beam and along the length direction of the pack case, The above protective cap is a battery pack that is attached to the top of the center beam.

14. In paragraph 1, The above cell assembly, A cell stack comprising a plurality of cells from which electrode leads are derived; and An end plate coupled to the front and rear surfaces of the cell stack; A battery pack in which the external terminal is formed on an end plate that is joined at a position corresponding to the electrode lead and is electrically connected to the electrode lead.

15. In paragraph 14, A battery pack wherein the cell assembly further includes a module frame surrounding the perimeter of the cell stack and coupled to the end plate.

16. In paragraph 15, The above module frame is, A lower frame supporting the lower portion of the above cell stack; an upper frame supporting the upper portion of the cell stack; and A pair of side frames supporting both sides of the cell stack; The upper frame is a battery pack including a plurality of opening holes.

Images