Battery pack

Abstract

The present invention relates to a battery pack housing a cell assembly including a pair of external terminals, and includes a pack case on which the cell assemblies are secured, the pack case including a base plate that supports the lower part of the plurality of cell assemblies, and a protective cap coupled to the center of the base plate, wherein the protective cap covers the external terminals of each housed cell assembly.

Description

Technical Field

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

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0039923 filed on March 22, 2024, and all the contents disclosed in the document of the Korean patent application are included as part of this specification.

Background Art

[0003] A battery pack applied to an electric vehicle or the like has a structure in which a number of cell assemblies including a plurality of secondary batteries are connected in series or in parallel in order to obtain high output. And, the secondary battery includes an electrode, a separator, an electrolyte, etc., and can be repeatedly charged and discharged by an electrochemical reaction between components.

[0004] FIG. 1 is a perspective view of a conventional battery pack, and the battery pack is composed of a plurality of cell assemblies 10 and a pack case 20 that can accommodate the cell assemblies 10.

[0005] The cell assembly 10 includes a pair of external terminals, and each cell assembly 10 is electrically connected via a separate bus bar that connects the external terminals.

[0006] On the other hand, when a short circuit occurs inside any one of the cell assemblies 10 housed in the pack case 20, a spark accompanied by high heat may be generated. At this time, if the ejecta of the spark or the like scatters and contacts the bus bar, a short circuit can be instantaneously generated in a large number of cell assemblies 10, which may lead to a large explosion or fire.

[0007] In particular, the cell assembly 10, which is usually housed in a battery pack, is positioned so that its external terminals face the center of the pack case 20, making it highly likely that the busbars will come into contact with the scattered spark particles. In other words, conventional battery packs have a structure in which the busbars are concentrated in the center, making them vulnerable to large fires if sparks or flames occur due to a short circuit. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Korean Published Patent Publication No. 10-2022-0001228 [Overview of the project] [Problems that the invention aims to solve]

[0009] Therefore, the present invention was created to solve the above-mentioned problems and aims to provide a battery pack with a configuration that can eliminate situations in which scattered spark discharge comes into contact with busbars and conductors.

[0010] Other objects and advantages of the present invention can be understood from the following description and will be more clearly seen from 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 as set forth in the claims. [Means for solving the problem]

[0011] The present invention provides a battery pack that houses a cell assembly including a pair of external terminals.

[0012] The battery pack includes a pack case into which the cell assemblies are secured, the pack case includes a base plate that supports the lower part of the cell assemblies, and a protective cap that is coupled to the center of the base plate, the protective cap covering the external terminals of each housed cell assembly.

[0013] The protective cap described above can be formed to extend across the center of the base plate and along the longitudinal direction of the pack case.

[0014] Multiple cell assemblies are symmetrical with respect to the width direction of the pack case and are arranged along the longitudinal direction of the pack case, and the protective caps can be provided to cover the space between a pair of spaced-apart cell assemblies.

[0015] The pair of cell assemblies described above are positioned spaced apart from each other such that one side on which the external terminals are located faces the other, and the protective cap can be provided to cover the upper part of the external terminals of the cell assemblies.

[0016] The protective cap described above may include a material having at least one of the properties of heat resistance and fire resistance.

[0017] The pack case further includes a connecting busbar that electrically connects any pair of adjacent cell assemblies, the ends of which are connected to the external terminals included in each cell assembly, and the protective cap can cover the top of the connecting busbar.

[0018] The pack case described above is formed to correspond to the shape of the connecting busbar and further includes a busbar cap that covers the top of the connecting busbar, the protective cap being able to cover the top of the busbar cap.

[0019] The pack case further includes a covering member located between the connecting busbar and the busbar cap, which covers the upper part of the connecting busbar, and the covering member may include an insulating material.

[0020] The base plate includes protruding portions that protrude at a predetermined interval along the central portion of the pack case, and the protective cap can be coupled and fixed to the protruding portions.

[0021] The upper end height of the protruding portion may be at least higher than the height of the external terminals of the cell assembly.

[0022] The protective cap includes an insertion opening that opens corresponding to the position of the protruding portion, and the protective cap can be coupled to the base plate such that the protruding portion is inserted into the insertion opening.

[0023] The protruding portion includes a coupling groove at the upper end, and the protective cap further includes a lower protruding portion that protrudes downward corresponding to the position of the protruding portion and has a diameter that can be inserted into the coupling groove. The protective cap can be coupled to the base plate such that the lower protruding portion is inserted into the coupling groove.

[0024] The pack case includes a center beam that extends across the central portion and is coupled to the base plate. The plurality of cell assemblies are symmetric with respect to each other based on the center beam and are arranged along the longitudinal direction of the pack case. The protective cap can be coupled to the upper end of the center beam.

[0025] The cell assembly includes a cell stack in which a plurality of cells with electrode leads led out are stacked, and end plates coupled to the front and rear surfaces of the cell stack. The external terminals are formed on the end plates coupled at positions corresponding to the electrode leads and can be electrically connected to the electrode leads.

[0026] The cell assembly can further include a module frame that surrounds the periphery of the cell stack and is coupled to the end plates.

[0027] The above module frame includes a lower frame that supports the lower part of the cell stack, an upper frame that supports the upper part of the cell stack, and a pair of side frames that support both sides of the cell stack. The upper frame can include a plurality of opening holes.

Advantages of the Invention

[0028] According to the present invention, by using a protective cap configuration that covers the bus bar and the conducting wire, etc., it is possible to prevent the phenomenon that the bus bar directly contacts the spark ejecta.

Brief Description of the Drawings

[0029] [Figure 1] It is a perspective view of a conventional battery pack. [Figure 2] It is a perspective view of a battery pack according to the first embodiment of the present invention. [Figure 3] It is a perspective view of separating the protective cap from the battery pack of FIG. 2. [Figure 4] It is a plan view of the battery packs of FIGS. 2 and 3. [Figure 5] It is a perspective view of a cell assembly. [Figure 6] It is a perspective view of a connecting bus bar and a protective cap. [Figure 7] It is a perspective view of a battery pack according to the second embodiment of the present invention. [Figure 8] It is a perspective view of a connecting bus bar, a bus bar cap, and a protective cap. [Figure 9] It is a perspective view of a battery pack according to the third embodiment of the present invention. [Figure 10] It is a plan view of the battery pack of FIG. 9. [Figure 11] It is a perspective view of a battery pack according to the fourth embodiment of the present invention. [Figure 12] It is a perspective view of separating the protective cap from the battery pack of FIG. 11. [Figure 13] It is a perspective view of a battery pack according to the fifth embodiment of the present invention. [Modes for carrying out the invention]

[0030] Preferred embodiments of the present invention will now be described in detail with reference to the attached drawings. As a premise, terms and words used herein and in the claims should not be interpreted in a manner limited to their general or dictionary meanings, but rather in a manner consistent with the technical spirit of the present invention, based on the principle that inventors may appropriately define the concepts of terms in order to best describe their own invention.

[0031] Therefore, the embodiments described herein and the configurations shown in the drawings represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention; there may be a variety of equivalents and modifications that can substitute for them at the time of filing.

[0032] Furthermore, in describing the present invention, if it is determined that a specific description of a related known configuration or function may obscure the gist of the present invention, such detailed description will be omitted.

[0033] Since embodiments of the present invention are provided to give a more complete explanation to an ordinary person, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or shown schematically for the sake of clarity. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes and proportions.

[0034] The present invention relates to a battery pack that houses a plurality of cell assemblies, each including a pair of external terminals.

[0035] Figures 2 to 6 relate to a battery pack according to the first embodiment of the present invention, Figures 7 to 8 relate to a battery pack according to the second embodiment of the present invention, Figures 9 to 10 relate to a battery pack according to the third embodiment of the present invention, Figures 11 to 12 relate to a battery pack according to the fourth embodiment of the present invention, and Figure 13 relates to a battery pack according to the fifth embodiment of the present invention.

[0036] Specific embodiments of the battery pack of the present invention will be described in detail below with reference to the attached drawings. For reference, the forward / backward and up / down / left / right directions used in the following description to specify relative positions are for the purpose of aiding the understanding of the invention, and unless otherwise defined, the directions shown in the drawings shall be used as the reference.

[0037] Here, the width direction of the cell assembly refers to the direction in which the cells are stacked, and the longitudinal direction of the cell assembly is defined as the direction perpendicular to the width direction of the cell assembly, that is, the direction connecting the two sides to which the end plates are joined.

[0038] Furthermore, the width direction D2 of the pack case refers to the longitudinal direction of the cell assembly housed in the pack case, and the longitudinal direction D1 of the pack case refers to the width direction of the cell assembly housed in the pack case.

[0039] (First Embodiment) Figure 2 is a perspective view of a battery pack 1 according to a first embodiment of the present invention, Figure 3 is a perspective view of the battery pack 1 of Figure 2 with the protective cap 400 separated, Figure 4 is a plan view of the battery pack 1 of Figures 2 and 3, and Figure 5 is a perspective view of the cell assembly 100.

[0040] The battery pack 1 of the present invention includes a pack case 1000 into which a cell assembly 100 is secured.

[0041] Furthermore, the battery pack 1 of the present invention may further include an upper case (not shown) that connects to the pack case 1000 so as to cover the upper part of the cell assembly 100 housed in the pack case 1000. However, since the upper case deviates from the features of the present invention, a detailed description will be omitted.

[0042] The cell assembly 100 described above includes a cell stack in which a plurality of cells (not shown) from which electrode leads are led out are stacked in one direction.

[0043] Each of the above cells includes an electrode assembly in which electrodes and a separation membrane are alternately stacked, electrode leads connected to the electrodes, a case enclosing the electrode assembly such that the electrode leads are led out to the outside, and an electrolyte filled together with the electrode assembly within the case.

[0044] The above electrode may be a positive electrode in which a slurry of positive electrode active material, binder resin, conductive material, and other additives is applied to at least one surface of the current collector, or a negative electrode in which a slurry of negative electrode active material, binder resin, conductive material, and other additives is applied to at least one surface of the current collector. Therefore, the above electrode assembly is constructed by alternately stacking positive electrodes, separator films, and negative electrodes.

[0045] 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 compounds or mixtures thereof, in which lithium ions can be intercalated and released.

[0046] The above-mentioned separation membrane can be made from a conventional porous polymer film used in lithium-ion batteries.

[0047] In the above case, the sheet material is processed into a predetermined shape. In this case, the sheet material is composed of a multilayer structure in which an outermost resin layer made of an insulating material such as polyethylene terephthalate (PET) or nylon is laminated, a metal layer made of aluminum that maintains mechanical strength and prevents the penetration of moisture and oxygen is laminated, and an inner resin layer made of a polyolefin-based material that has heat adhesion and acts as a sealant is laminated.

[0048] In the sheet material forming the above case, a predetermined adhesive resin layer may be interposed between the internal resin layer and the metal layer, and between the external resin layer and the metal layer, as needed. The adhesive resin layer is for smooth adhesion between dissimilar materials and is formed in single or multilayer form. The material used is usually a polyolefin resin, or a polyurethane resin may be used for smooth processing, and mixtures thereof can also be used.

[0049] The above-mentioned cells can be classified into rectangular, pouch-type, and cylindrical types depending on the form of the electrode assembly and case. However, in the detailed description and drawings of the present invention, a pouch-type cell will be used as an example for ease of understanding.

[0050] End plates 110, configured to protect and support the cell stack, can be attached to the front and rear surfaces of the cell stack.

[0051] The cell assembly 100 further includes external terminals 111 that are electrically connected to electrode leads led out to the cell stack.

[0052] The external terminal 111 is formed on the end plate 110, but one end of it is formed to be exposed to the outside of the end plate 110.

[0053] Specifically, the external terminal 111 is formed on one of a pair of end plates 110 located on the front and rear surfaces of the cell assembly 100, and is connected to the end plate 110 at a position corresponding to the electrode leads of the cell stack.

[0054] Referring to Figures 3 to 5, an external terminal 111 is formed on the end plate 110 located on the front of the cell assembly 100.

[0055] The cell assembly 100 further includes a module frame that surrounds the cell stack and connects to the end plate 110, as shown in Figure 5.

[0056] The module frame includes a lower frame (not shown) that supports the lower part of the cell stack, an upper frame 120 that supports the upper part of the cell stack, and a pair of side frames 130 that support both sides of the cell stack.

[0057] As shown in Figure 5, the upper frame 120 of the present invention includes an opening hole 121 that allows for the rapid discharge of gas, flames, and spark particles in the event of a thermal runaway phenomenon occurring inside the cell assembly 100 due to a short circuit or other cause. Therefore, if the cell stack surrounded by the module frame experiences a thermal runaway, gas and spark particles can be discharged upward through the opening hole 121.

[0058] Multiple cell assemblies 100 are arranged symmetrically with respect to the width direction D2 of the pack case 1000 and along the longitudinal direction D1 of the pack case 1000. Specifically, each cell assembly 100 is arranged such that its external terminals 111 face the center of the pack case 1000, as shown in Figures 3 and 4. At this time, a pair of symmetrical cell assemblies 100 are arranged at a predetermined distance apart, so that an empty space is formed in the center of the pack case 1000, as shown in Figures 3 and 4.

[0059] The above-mentioned empty space may be used for pedestrian walkways or other purposes.

[0060] The pack case 1000 further includes a connecting busbar 200 that electrically connects any pair of adjacent cell assemblies 100.

[0061] Referring to Figures 3 and 4, both ends of one of the connecting busbars 200 located between a pair of cell assemblies 100 are connected to one external terminal 111 included in each cell assembly 100.

[0062] Each of the above cell assemblies 100 is positioned such that its external terminals 111 all face towards the center of the pack case 1000. Therefore, the connecting busbar 200 is also located in the central area of ​​the pack case 1000.

[0063] According to some embodiments, the pack case 1000 may further include a covering member that covers the upper part of the busbar.

[0064] The above covering member includes an insulating material and serves to insulate a portion of the connecting busbar 200 to prevent short circuits and static electricity from occurring.

[0065] Since the covering member needs to cover and insulate the entire upper part of the connecting busbar 200, it is formed to correspond to the shape of the connecting busbar 200.

[0066] The pack case 1000 of the present invention includes a plate-shaped base plate that supports the lower part of the cell assembly 100, and side beams 700 that are coupled to the base plate along the edge of the base plate so as to support the sides of the cell assembly 100 which is fixed onto the base plate.

[0067] In some embodiments, the battery pack 1 may further include a crossbeam 800 interposed between any pair of cell assemblies 100 that are arranged adjacent to each other with respect to the longitudinal direction D1 of the pack case 1000, as shown in Figures 2 to 4, thereby separating each cell assembly 100.

[0068] The crossbeam 800 may serve to separate the sides of each cell assembly 100 so that they do not come into contact, or it may serve to support the sides of each cell assembly 100.

[0069] The pack case 1000 of the present invention further includes a protective cap 400 which is coupled to the center of the base plate.

[0070] The protective cap 400 serves to cover and protect a portion of the internal space of the pack case 1000.

[0071] As shown in Figures 2 to 4, the protective cap 400 covers the space between the separated pair of cell assemblies 100 at the center of the base plate.

[0072] Figure 6 is a perspective view of the connecting busbar 200 and protective cap 400.

[0073] As shown in Figures 2, 3, 4, and 6, the protective cap 400 covers the space between the cell assemblies 100 and also covers and protects the external terminals 111 of each cell assembly 100.

[0074] The protective cap 400 is provided to cover both the external terminal 111 of the cell assembly 100 and the connecting bus bar 200 that connects the external terminal 111, as shown in Figure 4.

[0075] As shown in Figures 2 and 3, the 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.

[0076] For example, the protective cap 400 protects the external terminals 111 of each cell assembly 100 located below the protective cap 400 from flying spark particles, flames, and high-temperature gases.

[0077] The protective cap 400 may include a material having at least one of the properties of heat resistance and fire resistance. For example, the protective cap 400 may include mica.

[0078] Furthermore, the protective cap 400 may further include an insulating material. For example, the protective cap 400 may further include glass fibers.

[0079] The battery pack 1 of the present invention, with its protective cap 400 covering the upper part of the connecting bus bar 200, minimizes the impact on other cell assemblies 100 even if an explosion or flame occurs in one of the cell assemblies 100 due to an internal short circuit or other cause, generating flying materials such as spark particles.

[0080] Furthermore, the battery pack 1 of the present invention can simultaneously protect the external terminals 111 and connecting busbars 200 of each cell assembly 100, along with conductors and other components that may be installed in the center of the pack case 1000, via the protective cap 400.

[0081] (Second Embodiment) Figure 7 is a perspective view of a battery pack 1 according to a second embodiment of the present invention, and Figure 8 is a perspective view of a connecting busbar 200, a busbar cap 300, and a protective cap 400.

[0082] 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.

[0083] The busbar cap 300 is formed to correspond to the shape of the connecting busbar 200 and covers the upper part of the connecting busbar 200, as shown in Figures 7 and 8.

[0084] The busbar cap 300 covers the connecting busbar 200 and protects it from approaching spark particles, flames, and high-temperature gases from the outside. Therefore, the busbar cap 300 includes a material having at least one of the properties of heat resistance and fire resistance. For example, the busbar cap 300 may include mica.

[0085] As shown in Figures 7 and 8, the protective cap 400 covers and protects the upper part of the external terminal 111, the connecting bus bar 200 that connects the external terminal 111, and the bus bar cap 300 that protects the external terminal 111 and the connecting bus bar 200.

[0086] According to some embodiments, the pack case 1000 may further include a covering member located between the connecting bus bar 200 and the bus bar cap 300, and covering the upper part of the connecting bus bar 200.

[0087] (Third embodiment) Figure 9 is a perspective view of a battery pack 1 according to a third embodiment of the present invention, and Figure 10 is a plan view of the battery pack 1 of Figure 9.

[0088] 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.

[0089] The center beam 500 is interposed in the empty space between the cell assemblies 100, which are spaced apart at predetermined intervals in the width direction D2 of the pack case 1000, and serves to separate each cell assembly 100.

[0090] As shown in Figures 9 and 10, the center beam 500 extends across the center of the pack case 1000 and is connected to the base plate. Therefore, with respect to the width direction D2 of the pack case 1000, the multiple cell assemblies 100 are symmetrical with respect to the center beam 500 and are arranged along the longitudinal direction D1 of the pack case 1000.

[0091] According to some embodiments, the center beam 500 may be manufactured in a hollow form and may serve as a passage through which gas moves.

[0092] According to some other embodiments, the center beam 500 may be manufactured in a hollow form and may contain wires or the like inside.

[0093] The protective cap 400 is connected to the upper end of the center beam 500 and can protect the external terminal 111, the connecting bus bar 200, and the center beam 500.

[0094] Furthermore, the protective cap 400 can protect the busbar cap 300 located on the upper part of the connecting busbar 200, as shown in Figures 9 and 10.

[0095] (Fourth Embodiment) Figure 11 is a perspective view of a battery pack 1 according to a fourth embodiment of the present invention, and Figure 12 is a perspective view of the battery pack 1 of Figure 11 with the protective cap 400 separated.

[0096] The pack case 1000 included in the battery pack 1 according to the fourth embodiment of the present invention further includes a protruding portion 600.

[0097] As shown in Figures 11 and 12, the protruding portion 600 protrudes along the center of the pack case 1000 at predetermined intervals.

[0098] The protective cap 400 of the present invention can be connected to and fixed to the protruding portion 600 that protrudes upward from the base plate.

[0099] The protective cap 400 includes an insertion opening 410 that is open to the position of the protrusion 600, and the protective cap 400 is coupled to the base plate such that the protrusion 600 is inserted into the insertion opening 410, as shown in Figure 11.

[0100] Preferably, the protruding portion 600 has a height that allows it to be inserted into the insertion opening 410 of the protective cap 400 that covers the external terminals 111 and connecting busbars 200 of the cell assembly 100. Therefore, the height of the upper end of the protruding portion 600 is at least higher than the height of the external terminals 111 of the cell assembly 100 housed in the pack case 1000.

[0101] Furthermore, in some embodiments, if the battery pack 1 is fitted with a busbar cap 300, the height of the upper end of the protrusion 600 is at least higher than the height of the busbar cap 300.

[0102] The protruding portion 600 is inserted into the insertion opening 410 of the protective cap 400, thereby restricting the horizontal movement of the protective cap 400. Therefore, the protective cap 400 can be stably fixed in the central position of the pack case 1000 without swaying horizontally.

[0103] (Fifth embodiment) Figure 13 is a perspective view of a battery pack 1 according to a fifth embodiment of the present invention.

[0104] The pack case 1000 included in the battery pack 1 according to the fifth embodiment of the present invention further includes a protrusion 600. The protective cap 400 further includes a lower protrusion 420 formed at a position corresponding to the protrusion 600.

[0105] As shown in Figure 13, the above-mentioned protrusion 600 includes a coupling groove 610 at its upper end, and the above-mentioned lower protrusion 420 protrudes downward in a position corresponding to the above-mentioned protrusion 600.

[0106] The protective cap 400 is connected to the base plate by the lower protrusion 420 being inserted into the coupling groove 610 of the protrusion 600.

[0107] The shape of the lower protrusion 420 corresponds to the shape of the coupling groove 610.

[0108] Furthermore, it is preferable that the diameter of the lower protrusion 420 is large enough to be inserted into the coupling groove 610.

[0109] The lower protrusion 420 can be inserted into the coupling groove 610 of the protrusion 600, thereby restricting its horizontal movement. In other words, the protective cap 400 can be stably fixed in the central position of the pack case 1000 without shaking horizontally.

[0110] The present invention has been described in more detail above with reference to the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be a variety of equivalents and modifications that can be substituted for them at the time of filing. [Explanation of symbols]

[0111] 10: (Conventional Technology) Cell Assembly 20: (Conventional technology) Pack case 1: Battery pack 1000: Pack Case 100: Cell assembly 110: End plate 111: External terminals 120: Upper frame 121: Opening Hall 130: Side frame 200: Connecting busbar 300: Bus bar cap 400: Protective cap 410: Insertion port 420: Lower protrusion 500: Center beam 600:Protrusion 610: Binding groove 700: Side beam 800: Crossbeam D1: Longest direction of the pack case D2: Width direction of the pack case

Claims

1. In a battery pack that houses a cell assembly including a pair of external terminals, Includes a pack case in which the cell assembly is secured, The aforementioned pack case is A base plate that supports the lower part of the cell assembly, The base plate includes a protective cap that is coupled to the center of the base plate, The protective cap covers the external terminals of each cell assembly housed in the battery pack.

2. The battery pack according to claim 1, wherein the protective cap is formed extending across the center of the base plate and along the longitudinal direction of the pack case.

3. The multiple cell assemblies are symmetrical with respect to the width direction of the pack case and are arranged along the longitudinal direction of the pack case. The battery pack according to claim 1 or 2, wherein the protective cap is provided to cover the space between a pair of separated cell assemblies.

4. The pair of cell assemblies are positioned apart from each other such that one side on which the external terminals are located faces the other. The battery pack according to claim 1 or 2, wherein the protective cap is provided to cover the upper part of the external terminals of the cell assembly.

5. The battery pack according to claim 1 or 2, wherein the protective cap comprises a material having at least one of the properties of heat resistance and fire resistance.

6. The aforementioned pack case is It further includes a connecting busbar that electrically connects any pair of adjacent cell assemblies, Both ends of the aforementioned connecting busbar are connected to the aforementioned external terminals included in each cell assembly. The battery pack according to claim 1 or 2, wherein the protective cap covers the upper part of the connecting busbar.

7. The aforementioned pack case is The busbar cap is formed to correspond to the shape of the connecting busbar and covers the upper part of the connecting busbar, The battery pack according to claim 6, wherein the protective cap covers the upper part of the busbar cap.

8. The pack case further includes a covering member located between the connecting busbar and the busbar cap, and covering the upper part of the connecting busbar. The battery pack according to claim 7, wherein the covering member includes an insulating material.

9. The aforementioned base plate is The pack case includes protruding portions that are spaced apart at predetermined intervals along the center of the pack case, The battery pack according to claim 1 or 2, wherein the protective cap is coupled to and fixed with the protruding portion.

10. The battery pack according to claim 9, wherein the upper end height of the protruding portion is at least higher than the height of the external terminals of the cell assembly.

11. The protective cap includes an opening that corresponds to the position of the protruding portion, The battery pack according to claim 9, wherein the protective cap is coupled to the base plate such that the protruding portion is inserted into the insertion opening.

12. The aforementioned protrusion includes a coupling groove at its upper end. The protective cap further includes a lower projection that protrudes downward in accordance with the position of the projection and has a diameter that allows it to be inserted into the coupling groove, The battery pack according to claim 9, wherein the protective cap is coupled to the base plate such that the lower protrusion is inserted into the coupling groove.

13. The pack case includes a center beam that extends across the center and is coupled to the base plate, The multiple cell assemblies are symmetrical with respect to the center beam and are arranged along the longitudinal direction of the pack case. The battery pack according to claim 1 or 2, wherein the protective cap is coupled to the upper end of the center beam.

14. The aforementioned cell assembly is A cell stack in which multiple cells from which electrode leads are derived are stacked, The cell stack includes end plates that are coupled to the front and rear surfaces of the cell stack, The battery pack according to claim 1 or 2, wherein the external terminals are formed on an end plate that is coupled at a position corresponding to the electrode leads and are electrically connected to the electrode leads.

15. The battery pack according to claim 14, wherein the cell assembly further includes a module frame that surrounds the cell stack and connects to the end plate.

16. The aforementioned module frame is A lower frame supporting the lower part of the cell stack, An upper frame that supports the upper part of the cell stack, The cell stack includes a pair of side frames that support both sides of the cell stack, The battery pack according to claim 15, wherein the upper frame includes a plurality of opening holes.

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