Battery pack

Abstract

The present invention relates to a battery pack. Specifically, the battery pack of the present invention includes a pack case having an external terminal formed on one side and a module area in which a plurality of battery modules are accommodated, a protective frame extending across the pack case and partitioning the module area, a bus bar electrically connecting a battery module to an external terminal of the pack case, and a battery management unit provided on the other side opposite to the one side of the pack case on which the external terminals are formed, the protective frame includes a slot extending along a longitudinal direction of the protective frame, the module area is partitioned by the protective frame, and includes a first battery part formed on one side of the protective frame and a second battery part formed on the other side of the protective frame, the bus bar is inserted into and fixed in the slot of the protective frame, and a side surface of the bus bar is enclosed by the protective frame.

Description

[Technical field]

[0001] The present invention relates to a battery pack, more specifically, to a battery pack including a structure capable of protecting bus bars, conductors, and the like installed inside the battery pack from high-temperature and high-pressure gas when thermal runaway occurs in any one of a plurality of battery modules arranged inside the battery pack and the high-temperature and high-pressure gas is generated.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0068260 dated June 3, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference. [Background technology]

[0003] A secondary battery is a battery that can be charged and discharged, unlike a primary battery that cannot be charged. It is used not only in portable devices but also in electric vehicles and hybrid vehicles that are driven by an electrical driving source. Currently, the types of secondary batteries that are widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, and nickel zinc batteries. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5V to 4.6V. Therefore, when a higher output voltage is required, a battery pack is formed by connecting a number of battery cells in series. Also, a battery pack may be formed by connecting a number of battery cells in parallel according to a charge / discharge capacity required for the battery pack. Therefore, the number of battery cells included in the battery pack may be variously set according to a required output voltage or charge / discharge capacity.

[0004] When a battery pack is constructed by connecting a number of battery cells in series / parallel, a battery module consisting of at least one battery cell, preferably a number of battery cells, is generally constructed first, and then other components are added to at least one such battery module to construct the battery pack. Here, the battery module refers to a component in which a number of battery cells are connected in series or parallel, and the battery pack refers to a component in which a number of battery modules are connected in series or parallel to increase capacity, output, etc.

[0005] Meanwhile, the battery pack may further include a battery management unit equipped with a battery management system (BMS) that measures current, voltage, temperature, etc. of a battery cell or a battery module to estimate a charge / discharge state, power state, and performance state of the battery and controls the battery to improve energy efficiency.

[0006] Each battery module is not directly connected to an external terminal of the battery pack, but is connected to the external terminal via the battery management unit, and the battery management unit checks the flow of current moving between the external terminal of the battery pack and the battery module. In general, the battery management unit is installed at a position opposite to the external terminal inside the battery pack. In this case, a long bus bar may be used to connect the battery management unit to the external terminal or the battery management unit to the battery module. Also, a separate measurement wire may be used from the battery management unit to measure the state of each battery module.

[0007] The bus bars and measurement leads are typically arranged to traverse the battery pack through the spaces between the battery modules.

[0008] However, if an abnormality occurs in a battery cell accommodated in a battery module and thermal runaway progresses, high-temperature and high-pressure gas may be generated and released from the battery module, which may cause problems such as the released gas damaging the busbar or damaging the insulating coating of the measuring conductor. In addition, the damaged conductor and busbar may interfere with the internal structure of the battery pack or may short-circuit, causing a major explosion of the battery pack.

[0009] Therefore, there is a demand for a battery pack having a structure capable of protecting the bus bars, conductors, etc. from high-temperature gas that may be generated from time to time. Summary of the Invention [Problem to be solved by the invention]

[0010] An object of the present invention is to provide a battery pack capable of preventing damage or short-circuiting of bus bars, measurement leads, etc. installed inside the battery pack when high-temperature and high-pressure gas is released from a battery module.

[0011] Other objects and advantages of the present invention can be understood from the following description and will be more clearly understood from the embodiments of the present invention. Also, it will be easily understood that the objects and advantages of the present invention can be realized by the means and combinations thereof as claimed in the claims. [Means for solving the problem]

[0012] According to the present invention, there is provided a battery pack including: a pack case having external terminals formed on one side thereof and including a module area in which a plurality of battery modules are housed; a protective frame extending across the pack case and defining the module area; bus bars electrically connecting battery modules to external terminals of the pack case; and a battery management unit provided on another side opposite to the one side of the pack case on which the external terminals are formed, the protective frame including slots extending along a longitudinal direction of the protective frame, the module area being defined by the protective frame, the module area including a first battery part formed on one side of the protective frame and a second battery part formed on the other side of the protective frame, the bus bars being inserted into and fixed in the slots of the protective frame, and a side surface being enclosed by the protective frame.

[0013] The slot may include a first slot and a second slot formed in parallel to each other at a predetermined interval on an upper portion of the protection frame.

[0014] A through groove may be formed on a side of the protection frame so that the slot is opened to the outside.

[0015] The bus bar may include a first bus bar connecting the first battery unit and an external terminal, and a second bus bar connecting the second battery unit and an external terminal.

[0016] The first busbar may include a first input busbar electrically connecting a battery management unit to the battery module and a first output busbar electrically connecting the battery management unit to an external terminal, and the second busbar may include a second input busbar electrically connecting the battery management unit to the battery module and a second output busbar electrically connecting the battery management unit to an external terminal.

[0017] The battery pack may further include a pair of measurement wires connected to the battery management unit and extending along the protective frame, and the protective frame may include an insertion hole into which the measurement wires can be inserted.

[0018] The insertion holes may be formed in parallel at a predetermined interval in a lower portion of the protection frame, and may include a first insertion hole and a second insertion hole into which the measurement wires are inserted, respectively.

[0019] The protective frame may further include an auxiliary frame formed at a lower portion of the protective frame, extending along the protective frame, and coupled to the protective frame.

[0020] The auxiliary frame includes an upper protrusion protruding along a longitudinal direction, and the protective frame includes a lower insertion portion recessed along a longitudinal direction into which the upper protrusion of the auxiliary frame can be inserted, and the auxiliary frame can be coupled to the protective frame with the upper protrusion inserted into the lower insertion portion of the protective frame.

[0021] The auxiliary frame may include an auxiliary slot formed in an upper portion thereof and extending along a longitudinal direction of the auxiliary frame.

[0022] The protection frame may have both lower ends coupled to the upper portion of the auxiliary frame to cover the auxiliary slot of the auxiliary frame.

[0023] A pair of auxiliary insertion holes may be defined and formed by an upper protrusion of the auxiliary frame between the protection frame and the auxiliary frame.

[0024] The battery modules may be arranged side by side in a module area along the longitudinal direction of the protective frame. Effect of the Invention

[0025] According to the present invention, it is possible to effectively prevent a phenomenon in which bus bars and measuring leads inside a battery pack are damaged or short-circuited due to high-temperature and high-pressure gas generated when a battery cell accommodated in a battery module is overheated or overcharged, and further, it is possible to effectively prevent an explosion of the battery pack due to the short circuit. [Brief description of the drawings]

[0026] [Figure 1] 1 is a perspective view of a battery pack according to a first embodiment of the present invention; [Diagram 2] 1 shows a cross section of a protective frame according to a first embodiment of the present invention. [Diagram 3] 1 is a partially enlarged view of a battery pack according to a first embodiment of the present invention. [Figure 4] 3 shows a cross section of a protective frame of the battery pack according to the first embodiment with a bus bar inserted therein. [Diagram 5] FIG. 1 is a plan view of a battery pack according to a first embodiment of the present invention. [Figure 6] FIG. 6 is a perspective view of the battery pack of FIG. 5. [Figure 7] 11 shows cross sections of a protective frame and an auxiliary frame of a battery pack according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a perspective view of a battery pack according to a second embodiment of the present invention. [Figure 9] 11A to 11C are diagrams illustrating a sequence of combining a protective frame and an auxiliary frame of a battery pack according to a second embodiment of the present invention. [Figure 10] FIG. 11 is a perspective view of a pack case according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the attached drawings. Before that, the terms and words used in the specification and claims should not be interpreted limitedly to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term to best describe his own invention.

[0028] Therefore, it should be understood that the embodiment described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiment of the present invention and do not represent the entire technical idea of ​​the present invention, and that there may be various equivalents and modifications that can replace them at the time of this application.

[0029] In addition, in the description of the present invention, if it is determined that a specific description of related publicly known configurations or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0030] Since the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or illustrated roughly for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0031] The present invention relates to a battery pack 1000. More specifically, the present invention relates to a battery pack 1000 to which a structure is applied that can protect a bus bar 300 and conductors installed inside the battery pack 1000 from the released gas when a thermal runaway occurs in any one of a plurality of battery modules 10 arranged inside the battery pack 1000 and high-temperature and high-pressure gas is released.

[0032] 1 to 6 relate to a battery pack 1000 according to a first embodiment of the present invention, and Fig. 7 to Fig. 10 relate to a battery pack 1000 according to a second embodiment of the present invention. Each embodiment will be described below with reference to the above drawings.

[0033] (First embodiment) FIG. 1 is a perspective view of a battery pack 1000 according to a first embodiment of the present invention.

[0034] 1, a battery pack 1000 according to a first embodiment of the present invention includes a pack case 100 in which a battery module 10 is housed, an upper case (not shown) covering an upper portion of the pack case 100, a protective frame 200, a bus bar 300, and a battery management unit 400. (The upper case corresponds to a known technology, and therefore will not be described in detail in the present invention.)

[0035] The battery module 10 accommodated in the battery pack 1000 of the present invention includes a cell stack (not shown) in which a plurality of battery cells (not shown) are stacked, and includes a module frame 11 and end plates 12 that surround and protect the cell stack. The battery module 10 also includes module terminals 12a that are electrically connected to electrode leads of the battery cells and led out of the end plates 12. At this time, the module terminals 12a are composed of a positive module terminal 12a and a negative module terminal 12a, and the positive module terminal 12a and the negative module terminal 12a may be formed on one side or both sides of the end plates 12, respectively.

[0036] The module terminals 12a of each battery module 10 housed in the battery pack 1000 are electrically connected to each other so that the battery pack 1000 has one output.

[0037] The pack case 100 has an external terminal 130 formed on one side thereof, and includes a module area in which a plurality of battery modules 10 are housed.

[0038] The battery pack 1000 may charge or discharge the plurality of battery modules 10 accommodated therein through the external terminal 130. That is, the external terminal 130 is configured to be electrically connected to an external charging device or discharging device, and is divided into a positive terminal and a negative terminal.

[0039] The pack case 100 has side walls 110 formed along its edges to protect the housed battery modules 10, and may include partitions 120 to separate each housed battery cell from adjacent battery cells.

[0040] The battery pack 1000 includes a module area defined by the side wall 110, and each battery module 10 is disposed in the module area and housed in the battery pack 1000.

[0041] The upper case (not shown) is coupled to the pack case 100 at the top of the pack case 100 to cover each battery module 10 in order to protect the upper portions of the battery modules 10 housed inside the pack case 100.

[0042] The battery management unit 400 includes a battery management system (BMS) that measures and controls the current, voltage, temperature, etc. of each battery module 10 housed in the battery pack 1000, and may be provided on the other side opposite to one side of the pack case 100 on which the external terminal 130 is formed.

[0043] The protective frame 200 is formed to extend across the pack case 100 and is disposed at the center of the pack case 100 .

[0044] The protective frame 200 may be fixed to the pack case 100 by being screwed to the bottom of the pack case 100 using a separate bolt member, may be joined to the pack case 100 using an adhesive, or may be fixed to the pack case 100 by a method such as welding or heat fusion.

[0045] The module area may be defined by the protective frame 200, and the module area defined by the protective frame 200 specifically includes a first battery section 140a formed on one side of the protective frame 200 and a second battery section 140b formed on the other side of the protective frame 200, and a plurality of modules are arranged in a row along the longitudinal direction of the protective frame 200 in each of the first battery section 140a and the second battery section 140b.

[0046] 2 is a cross-sectional view of a protection frame 200 according to a first embodiment of the present invention. Referring to FIG. 2, the protection frame 200 includes a pair of slots 210 at an upper portion. However, FIG. 2 is an example, and three or more slots 210 may be formed.

[0047] The plurality of slots 210 are preferably spaced apart at predetermined intervals.

[0048] 2, the slot 210 is formed to extend along the longitudinal direction of the protection frame 200. More specifically, the slot 210 includes a first slot 210a formed to extend along the longitudinal direction of the protection frame 200 at one side of the upper portion of the protection frame 200, and a second slot 210b spaced apart from the first slot 210a by a predetermined distance and formed to extend along the longitudinal direction of the protection frame 200.

[0049] In addition, the protection frame 200 may further include an insertion hole 220 corresponding to the slot 210 .

[0050] At least one insertion hole 220 may be formed in the lower portion of the protection frame 200, and the present invention will be described by taking two insertion holes 220 as an example.

[0051] The insertion hole 220 may be recessed into the lower portion of the protection frame 200 and extended along the longitudinal direction of the protection frame 200 .

[0052] Referring to FIG. 2, the insertion hole 220 includes a first insertion hole 220 formed at a position corresponding to the first slot 210a, and a second insertion hole 220 formed at a position corresponding to the second slot 210b.

[0053] In the present invention, the protective frame 200 is used for the purpose of enduring high-temperature and high-pressure gas emitted from the battery module 10, and therefore preferably includes a flame-retardant material.

[0054] The bus bar 300 is installed inside the battery pack 1000 to electrically connect the battery module 10 and the external terminal 130 of the pack case 100 .

[0055] The bus bar 300 is used for the purpose of charging and discharging each battery module 10 housed in the pack case 100.

[0056] The bus bar 300 is disposed across the pack case 100 and is preferably inserted into and fixed to the slot 210 of the protection frame 200 .

[0057] The bus bar 300 includes a first bus bar 300a connecting the battery module 10 of the first battery unit 140a and the external terminal 130, and a second bus bar 300b connecting the battery module 10 of the second battery unit 140b and the external terminal 130.

[0058] In addition, each bus bar 300 may be divided into an input bus bar electrically connecting the battery management unit 400 and the battery module 10, and an output bus bar electrically connecting the battery management unit 400 and the external terminal 130. At this time, the input bus bar is used for the purpose of electrically connecting the battery module 10 and the battery management unit 400 so that the battery management unit 400 can adjust and control the flow of current between the battery module 10 and the external terminal 130.

[0059] Specifically, the first bus bar 300a includes a first input bus bar electrically connecting the battery management unit 400 and the battery module 10, and a first output bus bar electrically connecting the battery management unit 400 and the external terminal 130.

[0060] In addition, the second bus bar 300b includes a second input bus bar electrically connecting the battery management unit 400 and the battery module 10, and a second output bus bar electrically connecting the battery management unit 400 and the external terminal 130.

[0061] FIG. 3 is a partial enlarged view of the battery pack 1000 according to the first embodiment of the present invention.

[0062] As shown in FIG. 3 , the bus bar 300 is led out from the battery management unit 400, inserted into the slot 210 of the protection frame 200, and installed so as to cross the pack case 100 along the slot 210.

[0063] The first bus bar 300 a is inserted into a first slot 210 a of the protection frame 200 , and the second bus bar 300 b is inserted into a second slot 210 b of the protection frame 200 .

[0064] More specifically, the first bus bar 300a is inserted into the first slot 210a to electrically connect the battery management unit 400 and the battery module 10 of the first battery part 140a, and the second bus bar 300b is inserted into the second slot 210b to electrically connect the battery management unit 400 and the battery module 10 of the second battery part 140b.

[0065] FIG. 4 shows a cross section of protective frame 200 with bus bar 300 inserted therein.

[0066] 4, the bus bars 300 are inserted into the respective slots 210 with only the top surface exposed to the outside so that both sides can be supported and wrapped by the protective frame 200. At this time, both sides of the bus bars 300 can be completely protected by the protective frame 200.

[0067] The protection frame 200 may further include a through hole 230 formed on a side surface thereof so that the slot 210 can be opened to the outside.

[0068] The through grooves 230 serve as a passage through which the bus bars 300, which are inserted into the slots 210 and installed inside the protective frame 200, exit to the outside, and the bus bars 300 passing through the through grooves 230 are connected to the module terminals 12a of the battery modules 10. That is, the bus bars 300, which are inserted into the slots 210 and formed to extend from the battery management unit 400, are led out to the outside through the through grooves 230 located at the tip of the protective frame 200, and the led out bus bars 300 are connected to the module terminals 12a of the battery module 10 at positions corresponding to the through grooves 230.

[0069] Referring to FIG. 1, the through-slot 230 is located at the tip of the protection frame 200 that is formed to extend from the position of the battery management unit 400 .

[0070] The through-holes 230 may be formed on both sides of the protection frame 200, and a plurality of through-holes 230 may be formed on one side, if necessary.

[0071] The battery pack 1000 according to the first embodiment of the present invention may further include a pair of measurement wires 500 extending along the protective frame 200.

[0072] The measurement conductor 500 is used for the purpose of measuring and monitoring in real time changes in electrical characteristics of the battery modules 10 when each battery module 10 is charged and discharged, and electrically connects the battery management unit 400 and the battery modules 10.

[0073] As shown in FIG. 4, the measurement wire 500 is installed at the bottom of the protective frame 200, inserted into the insertion hole 220 of the protective frame 200, and covered by the protective frame 200 so as to be protected from external impact and heat.

[0074] The measurement wire 500 includes a first measurement wire 500 for measuring electrical characteristics of the battery module 10 included in the first battery part 140a and a second measurement wire 500 for measuring electrical characteristics of the battery module 10 included in the second battery part 140b. At this time, the first measurement wire 500 is inserted into the first insertion hole 220 of the protection frame 200 for protection, and the second measurement wire 500 is inserted into the second insertion hole 220 of the protection frame 200 for protection.

[0075] In this manner, the battery pack 1000 of the present invention is capable of protecting the bus bar 300 and the measurement wires 500 from fire and heat generated from the outside by using the protective frame 200 including a plurality of slots 210 and insertion holes 220 into which the bus bar 300 and the measurement wires 500 installed across the center of the pack case 100 are inserted and covered.

[0076] FIG. 5 is a plan view (upper case not shown) of a battery pack 1000 according to a first embodiment of the present invention, and FIG. 6 is a perspective view of the battery pack 1000 of FIG.

[0077] 5 and 6, a plurality of battery modules 10 are arranged side by side in each of the first battery part 140a and the second battery part 140b on both sides of the protection frame 200. As shown in FIG.

[0078] 5 and 6, the battery module 10 is accommodated in the module area such that the module terminal 12a faces the protective frame 200. When thermal runaway occurs inside each of the battery modules 10 accommodated in the first battery unit 140a and the second battery unit 140b, high-temperature and high-pressure gas may be generated, and the gas may be discharged toward the end plate 12 on which the module terminal 12a is formed. That is, the high-temperature and high-pressure gas may be discharged toward the bus bar 300 and the measurement conductor 500 located at the center of the pack case 100.

[0079] The battery pack 1000 according to the first embodiment of the present invention has the advantage that even if thermal runaway occurs inside any one of the battery modules 10, generating high-temperature, high-pressure gas, the bus bar 300 and the measurement conductor 500 can be protected by the protective frame 200.

[0080] Second embodiment The battery pack 1000 according to the second embodiment of the present invention is characterized in that it includes an auxiliary frame 600 that can be combined with the protective frame 200 of the first embodiment.

[0081] FIG. 7 shows a cross-section of a protective frame 200 and an auxiliary frame 600 of a battery pack 1000 according to a second embodiment of the present invention, and FIG. 8 shows an oblique view of a battery pack 1000 (excluding the battery module 10) to which the protective frame 200 and auxiliary frame 600 of FIG. 7 are applied.

[0082] The auxiliary frame 600 is formed at the lower part of the protection frame 200 to extend along the longitudinal direction of the protection frame 200 and has a structure to be coupled to the protection frame 200 .

[0083] As shown in FIGS. 7 and 8, the auxiliary frame 600 includes an upper protrusion 600a that protrudes upward, and the upper protrusion 600a is formed to extend along the longitudinal direction of the auxiliary frame 600.

[0084] The protective frame 200 of the battery pack 1000 according to the second embodiment includes a lower insertion portion 200a recessed along the longitudinal direction into which the upper protrusion 600a of the auxiliary frame 600 can be inserted.

[0085] 7, the lower insertion portion 200a is formed in a space between the first slot 210a and the second slot 210b, and more specifically, is formed between a pair of insertion holes 220 formed in the lower portion of the protection frame 200. In this case, a step portion 240 may be formed in an area where the existing insertion holes 220 are formed due to the formation of the lower insertion portion 200a.

[0086] A pair of auxiliary insertion holes 250 may be formed between the protection frame 200 and the auxiliary frame 600 and defined by the upper protrusion 600 a of the auxiliary frame 600 .

[0087] More specifically, the auxiliary frame 600 is coupled to the protective frame 200 with the upper protrusion 600a inserted into the lower insertion portion 200a of the protective frame 200, and as a result of this coupling, the area in which the step portion 240 is located is partitioned by the upper protrusion 600a, and an auxiliary insertion hole 250 surrounded by the protective frame 200 and the auxiliary frame 600 may be formed.

[0088] The auxiliary insertion hole 250 is formed to extend along the longitudinal direction of the protection frame 200 and the auxiliary frame 600 .

[0089] As shown in FIG. 7, the auxiliary frame 600 includes an auxiliary slot 610 formed at an upper portion thereof and extending along the longitudinal direction of the auxiliary frame 600 .

[0090] The upper portion of the auxiliary frame 600 may include a plurality of auxiliary slots 610, and the auxiliary slots 610 may be formed on both sides of the upper protrusion 600a.

[0091] An additional bus bar 300 may be further inserted into the auxiliary slot 610, and preferably an output bus bar connecting the battery management unit 400 and the external terminal 130 of the pack case 100 is inserted therein. That is, an input bus bar may be inserted into and fixed in the slot 210 of the protection frame 200, and an output bus bar may be inserted into and fixed in the auxiliary slot 610 of the auxiliary frame 600.

[0092] More specifically, a first input bus bar connecting the battery module 10 of the first battery part 140a and the battery management unit 400 is inserted into the first slot 210a of the protective frame 200, a second input bus bar connecting the battery module 10 of the second battery part 140b and the battery management unit 400 is inserted into the second slot 210b, a first output bus bar electrically connected to the first input bus bar and connecting the battery management unit 400 and the external terminal 130 is inserted into the auxiliary slot 610 of the auxiliary frame 600 corresponding to the position of the first slot 210a of the protective frame 200, and a second output bus bar electrically connected to the second input bus bar and connecting the battery management unit 400 and the external terminal 130 is inserted into the auxiliary slot 610 of the auxiliary frame 600 corresponding to the position of the second slot 210b of the protective frame 200.

[0093] The bus bar 300 installed across the center of the pack case 100 in this manner can be separated onto both sides by the slots 210 of the protective frame 200 and the auxiliary slots 610 of the auxiliary frame 600, and the bus bar 300 separated onto both sides as described above can be separated and disconnected onto the top and bottom by the connection structure of the protective frame 200 and the auxiliary frame 600.

[0094] 7, it is preferable that both lower ends of the protective frame 200 are coupled to the upper part of the auxiliary frame 600 so as to cover the auxiliary slot 610 of the auxiliary frame 600. That is, by coupling the protective frame 200 and the auxiliary frame 600, the upper part of the auxiliary slot 610 is entirely covered by the protective frame 200. Therefore, the bus bar 300 inserted into the auxiliary slot 610 may have both side surfaces and a lower surface protected by the auxiliary slot 610 and an upper surface protected by the protective frame 200.

[0095] The measurement wire 500 may be seated on both sides of the upper protrusion 600a of the auxiliary frame 600 and may be covered and protected by the protection frame 200. Specifically, the measurement wire 500 may be protected by being inserted into the auxiliary insertion hole 250. In this case, the auxiliary insertion hole 250 may be formed on the upper part of the auxiliary slot 610 and may share the same space as the auxiliary slot 610.

[0096] FIG. 9 shows the process of joining the auxiliary frame 600 and the protective frame 200, and inserting and seating the bus bars 300 and the measurement leads 500.

[0097] 9, an auxiliary frame 600 is installed and fixed at the bottom of a pack case 100, an output bus bar is inserted into an auxiliary slot 610 of the auxiliary frame 600, and a measurement wire 500 is seated on an upper portion of the auxiliary slot 610 into which the output bus bar is inserted. Then, the protection frame 200 is coupled to the auxiliary frame 600 so as to cover the measurement wire 500 and the output bus bar, and an input bus bar is inserted and installed in the slot 210 of the protection frame 200.

[0098] FIG. 10 is a perspective view of a pack case 100 according to the second embodiment of the present invention.

[0099] 10, a plurality of battery modules 10 are arranged side by side on both sides of the protection frame 200 and the auxiliary frame 600, respectively.

[0100] The battery module 10 is accommodated in the module area so as to face the protection frame 200 and the auxiliary frame 600 as shown in FIG.

[0101] The battery pack 1000 of the second embodiment of the present invention has the advantage that even if thermal runaway occurs inside any one of the battery modules 10, generating high-temperature and high-pressure gas, the bus bar 300 and the measurement conductor 500 can be protected by the protective frame 200 and the auxiliary frame 600.

[0102] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments, etc. in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, so it should be understood that there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0103] 1000: Battery pack 10: Battery module 11: Module frame 12: End plate 12a: Module terminal (positive module terminal; negative module terminal) 100: Pack case 110: Side wall 120: Bulkhead 130: External terminal 140: Module area 140a: First battery section 140b: Second battery section 200:Protection frame 200a: Lower insert 210: Slot 210a: 1st slot 210b: Second slot 220: Insertion hole (first insertion hole; second insertion hole) 230:Through groove 240: Step 250: Auxiliary insertion hole 300: Busbar 300a: 1st busbar 300b: 2nd bus bar 400: Battery management unit 500: Measuring lead wire (1st measuring lead wire; 2nd measuring lead wire) 600: Auxiliary frame 600a: Upper protrusion 610: Auxiliary slot

Claims

1. a pack case including a module area having an external terminal formed on one side thereof and accommodating a plurality of battery modules therein; a protective frame extending across the pack case and defining the module area; a bus bar electrically connecting the battery module and an external terminal of the pack case; and a battery management unit provided on a side opposite to the side of the pack case where the external terminals are formed; A battery pack comprising: The protective frame includes a slot extending along a longitudinal direction of the protective frame, the module area is partitioned by the protective frame and includes a first battery part formed on one side of the protective frame and a second battery part formed on the other side of the protective frame, The bus bar is inserted into and fixed in a slot of the protective frame, and a side surface of the battery pack is enclosed by the protective frame.

2. The slot is The battery pack according to claim 1 , comprising a first slot and a second slot formed in parallel to each other and spaced apart from each other by a predetermined distance on an upper portion of the protective frame.

3. The battery pack according to claim 1 , wherein a through groove is formed on a side surface of the protection frame so that the slot is opened to the outside.

4. The bus bar is The battery pack of claim 1 , comprising: a first bus bar connecting the first battery unit and an external terminal; and a second bus bar connecting the second battery unit and an external terminal.

5. the first bus bar includes a first input bus bar electrically connecting the battery management unit and the battery module, and a first output bus bar electrically connecting the battery management unit and an external terminal; 5. The battery pack of claim 4, wherein the second bus bar includes a second input bus bar electrically connecting a battery management unit and the battery module, and a second output bus bar electrically connecting the battery management unit and an external terminal.

6. The battery pack includes: The battery management unit further includes a pair of measurement conductors that are connected to the battery management unit and extend along the protective frame, The battery pack according to any one of claims 1 to 5, wherein the protective frame includes an insertion hole into which the measurement lead can be inserted.

7. The insertion hole is The battery pack according to claim 6 , comprising a first insertion hole and a second insertion hole formed in parallel at a predetermined interval in a lower portion of the protective frame, into which the measurement wires are respectively inserted.

8. The battery pack of claim 7 , further comprising an auxiliary frame formed at a lower portion of the protection frame, extending along the protection frame, and coupled to the protection frame.

9. The auxiliary frame includes an upper protrusion protruding along a longitudinal direction, the protective frame includes a lower insertion portion that is recessed along a longitudinal direction so that the upper protrusion of the auxiliary frame can be inserted therein; The battery pack according to claim 8 , wherein the auxiliary frame is coupled to the protection frame in a state where an upper protrusion is inserted into a lower insertion portion of the protection frame.

10. The auxiliary frame is 10. The battery pack according to claim 9, further comprising an auxiliary slot formed in an upper portion thereof and extending along a longitudinal direction of the auxiliary frame.

11. The battery pack of claim 10 , wherein both side lower ends of the protection frame are coupled to an upper portion of the auxiliary frame to cover the auxiliary slot of the auxiliary frame.

12. The battery pack of claim 10 , further comprising a pair of auxiliary insertion holes defined by an upper protrusion of the auxiliary frame between the protection frame and the auxiliary frame.

13. The battery pack according to claim 1 , wherein the battery modules are arranged side by side in a module area along a longitudinal direction of the protective frame.

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