Secondary Battery Module

Abstract

To provide a secondary battery module in which the adhesion force between a tab and a bus bar is kept and the tab and the bus bar are fixed stably.SOLUTION: A secondary battery module includes a holder that accommodates a plurality of battery cells apart from each other in a first direction and a second direction that intersect with each other, a plurality of tabs electrically connecting the battery cells, and bus bars that couple the tabs to a battery management system (BMS). At least one of the tabs includes an inner planar part, and an inner side surface part that is bent to the inner planar part and is fixed to a side surface of the holder. At least one of the bus bars includes an outer side surface part that is coupled to the inner side surface part of the tab, and an outer planar part that is bent to the outer side surface part and is disposed apart from the inner planar part. The holder includes a rib that fixes at least one of the inner side surface part of the tab and the outer side surface part of the bus bar.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a secondary battery module, and more particularly to a secondary battery module in which tabs that electrically connect a plurality of battery cells housed in a holder are connected to a battery management system by bus bars. [Background technology]

[0002] Unlike primary batteries, rechargeable batteries are batteries that can be repeatedly charged and discharged. Small-capacity secondary batteries are used in small, portable electronic devices such as mobile phones, laptops, and camcorders. Large-capacity and high-density secondary batteries are used as power sources for driving motors in hybrid and electric vehicles and for energy storage.

[0003] The secondary battery may be used as a secondary battery module including a plurality of battery cells connected in series and / or parallel to drive a motor of a hybrid vehicle, which requires a relatively high energy density. For example, to realize a relatively high-power secondary battery module (e.g., an electric vehicle), a secondary battery module is formed by connecting electrode terminals of a plurality of battery cells provided in a number corresponding to a desired amount of power to each other.

[0004] For example, a secondary battery module includes a plurality of core packs, each of which includes a plurality of battery cells connected in series and / or parallel, and is formed by housing the core packs in a case.

[0005] Because secondary battery modules require high voltages and currents under consumer usage conditions, they include tabs that connect battery cells together and bus bars that connect the tabs to the battery management system. It is important to secure the bus bars in the desired position. To set the positions of the tabs and bus bars, maintain adhesion, and secure the bus bars, the holders are equipped with guide bosses and guide ribs, and screws or bolts are used.

[0006] When a secondary battery module has a large capacity and is formed by arranging multiple core packs adjacent to each other in the horizontal direction, the space between the core packs is narrow, making it difficult to form guide bosses and guide ribs on the holder, and in some cases, screws or bolts cannot be used. Summary of the Invention [Problem to be solved by the invention]

[0007] An object of one embodiment of the present invention is to provide a secondary battery module that maintains the adhesive force between a tab and a bus bar and stably fixes the tab and the bus bar. An object of one embodiment of the present invention is to provide a secondary battery module that maintains adhesion between tabs and bus bars and stably fixes the tabs and bus bars even when the space between adjacent core packs is narrow. [Means for solving the problem]

[0008] A secondary battery module according to one embodiment of the present invention includes a holder that accommodates a plurality of battery cells spaced apart in a first direction and a second direction that intersect with each other, a plurality of tabs that electrically connect the battery cells to each other, and a bus bar that connects the tabs to a battery management system (BMS), wherein at least one of the tabs includes an inner flat portion and an inner surface portion that is bent relative to the inner flat portion and fixed to a side of the holder, and at least one of the bus bars includes an outer surface portion that is connected to the inner surface portion of the tab and an outer flat portion that is bent relative to the outer surface portion and disposed at a distance from the inner flat portion, and the holder includes a rib that fixes at least one of the inner surface portion of the tab and the outer surface portion of the bus bar.

[0009] The rib may include an inner rib member that forms an open structure toward the inner side surface of the tab and is coupled to the inner side surface, and an outer rib member that forms an open structure toward the outer side surface of the bus bar and is coupled to the outer side surface.

[0010] The inner rib member and the outer rib member may be integrally formed on a side surface of the holder and independently spaced apart from each other in the first direction.

[0011] The inner rib member may form a first gap on the inside of a side surface of the holder, and the outer rib member may form a second gap on the outside of the side surface of the holder that includes the first gap and is larger than the first gap.

[0012] The tab includes a first tab member having an inner flat surface portion that is disposed on the plane of the holder and connected to the battery cell, and an inner side surface portion that is bent relative to the inner flat surface portion and disposed on the side surface of the holder, and a second tab member that is disposed on the upper and lower surfaces of the holder and connects the battery cells to each other, and the inner side surface portion of the first tab member may be joined and fixed to the inner rib member.

[0013] The inner rib member may be formed on a side surface of the holder with a first length shorter than the length of the inner side surface portion, and may couple and fix a portion of the entire length of the inner side surface portion.

[0014] The bus bar may include a first bus bar member and a second bus bar member, the second bus bar member including an outer flat portion facing the inner flat portion of the first tab member, and an outer surface portion bent relative to the outer flat portion and connected to face the inner surface portion of the first tab member, and the outer surface portion of the second bus bar member may be coupled and fixed to the outer rib member.

[0015] The outer surface portion may be bonded to the outer rib member and may be bonded and pressed against the inner surface portion at the surface.

[0016] The outer rib member may be formed with a second length corresponding to the length of the outer surface portion on a side surface of the holder and being longer than the first length.

[0017] A portion of the inner surface portion corresponding to the outer rib member may be fixedly coupled to the outer surface portion and the outer rib member.

[0018] The outer rib member may be formed in one or more portions corresponding to the length of the outer surface portion on the side of the holder.

[0019] The holder may include a first holder that accommodates one side of a plurality of battery cells spaced apart in the first direction and the second direction that intersect with each other, and a second holder that accommodates the other side of the battery cells, and the first holder and the second holder may be connected to each other using a snap-fit ​​structure.

[0020] The rib may be formed on a side surface of either the first holder or the second holder.

[0021] The battery pack may further include a case that accommodates the lower side of the holder and a cover that covers the upper side of the holder, and the cover may have ribs on its inner surface that correspond to the battery cells.

[0022] The ribs may be formed in the shape of regular hexagons and may be repeatedly arranged in the first direction and the second direction. [Effects of the Invention]

[0023] In one embodiment of the secondary battery module, the holder is provided with ribs for fixing the inner surface of the tab or the outer surface of the bus bar, thereby maintaining the adhesion between the tab and the bus bar and stably fixing the tab and the bus bar.

[0024] In one embodiment of the secondary battery module, the inner surface of the tab and the outer surface of the bus bar are fixed together by the ribs of the holder. Therefore, even when the side space of the secondary battery module is narrow or the space between adjacent core packs is narrow, the adhesion between the tab and the bus bar can be maintained and the tab and the bus bar can be stably fixed together. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view of a secondary battery module according to a first embodiment of the present invention; [Figure 2] 1 is an exploded perspective view of a secondary battery module according to a first embodiment of the present invention. [Figure 3] 3 is a partial cross-sectional perspective view taken along line III-III in FIG. 1, illustrating the relationship in which a first holder and a second holder are fastened together by a fastening member. [Figure 4] FIG. 4 is a cross-sectional perspective view taken along line IV-IV in FIG. [Figure 5] FIG. 2 is a cross-sectional perspective view taken along line VV in FIG. [Figure 6] 1. FIG. 4 is a plan view showing the connection and arrangement of battery cells and tabs on the upper surface of a second holder of the secondary battery module of FIG. [Figure 7]1. FIG. 4 is a plan view showing the connection and arrangement of battery cells and tabs on the bottom surface of a first holder of the secondary battery module of FIG. [Figure 8] FIG. 10 is a perspective view of a secondary battery module according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view of a secondary battery module (in a state where the secondary battery module is combined into a case as a core pack) according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view of a secondary battery module (in a state where the secondary battery module is combined with a cover as a core pack) according to a third embodiment of the present invention. [Figure 11] FIG. 11 is a longitudinal cross-sectional view taken along line IX-IX in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts unnecessary for the explanation are omitted in order to clearly explain the present invention, and the same reference numerals are used throughout the specification to refer to the same or similar components.

[0027] Fig. 1 is a perspective view of a secondary battery module according to a first embodiment of the present invention, and Fig. 2 is an exploded perspective view of the secondary battery module according to the first embodiment of the present invention. Referring to Fig. 1 and Fig. 2, the secondary battery module 1 of the first embodiment includes a holder 100 (10, 20), a plurality of tabs 30 (31, 32), and a plurality of bus bars 40 (41, 42).

[0028] For example, the holder 100 includes a first holder 10 and a second holder 20. The first holder 10 forms a bottom holder of the secondary battery module 1, the second holder 20 forms a top holder, and the tab 30 may be formed of a nickel tab containing a nickel material.

[0029] The first holder 10 and the second holder 20 form a honeycomb structure inside to accommodate a plurality of battery cells 50 spaced apart in a first direction (x-axis direction) and a second direction (y-axis direction) intersecting the first direction, and are connected to each other in a third direction (z-axis direction) intersecting the second direction via connecting members 60.

[0030] 1 and 2, the first holder 10 accommodates the lower side of the battery cell 50, and the second holder 20 accommodates the upper side of the battery cell 50. In this state, the first and second holders 10, 20 are fastened together by a connecting member 60.

[0031] Figure 3 is a partial cross-sectional perspective view showing the fastening relationship between the first holder and the second holder by a fastening member taken along line III-III in Figure 1. Referring to Figures 1 to 3, the first holder 10 and the second holder 20 can be connected by a snap-fit ​​structure between a protrusion 11 provided on the outside of the first holder 10 and a coupling portion 12 provided on the outside of the second holder 20 corresponding to the protrusion 11.

[0032] For example, the connecting member 60 is formed as a pillar structure longer than the height of the second holder 10, and includes a threaded portion 601 and a head portion 62 at both ends of the pillar. The threaded portion 601 is formed as a screw at one end of the pillar so as to penetrate the second holder 20 and be screwed to the first holder 10. The head portion 62 is formed on the other side of the pillar with a diameter (D1) larger than the diameter (D2) of the pillar, and is located on the upper surface of the second holder 20. The head portion 62 has a driver groove.

[0033] The multiple tabs 30 electrically connect the battery cells 50 in parallel and in series, and include, for example, a first tab member 31 and a second tab member 32. The bus bar 40 connects the tabs 30 to a battery management system (BMS), and includes, for example, a first bus bar member 41 and a second bus bar member 42.

[0034] A first tab member 31, which is one of the tabs 30, includes an inner flat surface portion 311 and an inner surface portion 312 that is bent relative to the inner flat surface portion 311 and fixed to a side surface of the holder 100. The inner flat surface portion 311 is disposed on the plane of the holder 100 and is connected to the battery cells 50, and the inner surface portion 312 is bent relative to the inner flat surface portion 311 and is disposed on the side surface of the holder 100. The second tab members 32 are disposed on the upper and lower surfaces of the holder 100 and connect the battery cells 50 to each other.

[0035] The second bus bar member 42, which is one of the bus bars 40, includes an outer surface portion 422 connected to the inner surface portion 312 of the first tab member 31, and an outer flat surface portion 421 bent relative to the outer surface portion 422 and spaced apart from the inner flat surface portion 311. The outer flat surface portion 421 faces the inner flat surface portion 311 of the first tab member 31, and the outer surface portion 422 faces and is connected to the inner surface portion 312 of the first tab member 31.

[0036] 1, 2, 4 and 5, the holder 100 includes a rib 80 that fixes at least one of the inner surface portion 312 of the first tab member 31 and the outer surface portion 422 of the second bus bar member 42.

[0037] For example, the rib 80 includes an inner rib member 81 and an outer rib member 82. The inner rib member 81 forms an open structure toward the inner side surface portion 312 of the first tab member 31 and is coupled to the inner side surface portion 312. At this time, the inner rib member 81 tightly contacts the inner side surface portion 312 with the holder 100. To this end, the inner rib member 81 forms a first gap (G1) on the inner side of the holder 100.

[0038] The inner rib member 81 is formed on the side of the holder 100 with a first length (L1) shorter than the length of the inner side surface portion 312, and connects and fixes a part of the entire length of the inner side surface portion 312.

[0039] The outer rib member 82 forms an open structure toward the outer surface portion 422 of the second bus bar member 42 and is coupled to the outer surface portion 422. The outer rib member 82 tightly contacts the outer surface portion 422 with the holder 100. At the same time, the outer rib member 82 further tightly contacts the inner surface portion 312 and the outer surface portion 422 because the inner surface portion 312 is located between the outer surface portion 422 and the holder 100. In other words, the outer surface portion 422 is coupled to the outer rib member 82 and is bonded to the inner surface portion 312 at its surface, thereby applying pressure.

[0040] To this end, outer rib member 82 forms second gap (G1) on the outer side of holder 100. Second gap (G2) includes first gap (G1) and is formed larger than first gap (G1) so that inner surface portion 312 and outer surface portion 422 can be accommodated in an overlapping manner. Therefore, the adhesive force between tab 30 and bus bar 40 can be maintained, and tab 30 and bus bar 40 can be stably fixed.

[0041] The inner rib member 81 and the outer rib member 82 are independently spaced apart from each other in the first direction (x-axis direction) and are integrally formed on the side surface of the holder 100. The outer surface of the inner rib member 81 forms a plane with the outer surface of the side surface of the holder 100, and the outer rib member 82 protrudes beyond the outer surface of the side surface of the holder 100.

[0042] Therefore, even when the side space of the secondary battery module 1 is narrow or when one or more secondary battery modules 1 are installed consecutively in the xy plane and the space between the side surfaces of the secondary battery modules 1 is narrow, the inner rib member 81 and the outer rib member 82 maintain the adhesion force between the tab 30 and the bus bar 40, and stably fix the tab 30 and the bus bar 40.

[0043] The outer rib member 82 corresponds to the length of the outer surface portion 422 on the side of the holder 100 and is formed with a second length (L2) longer than the first length (L1). The outer rib member 82 stably fixes the inner surface portion 312 of the first tab member 31 and the outer surface portion 422 of the second bus bar member 42, thereby strengthening the electrical connection. Therefore, the inner surface portion 312 is partially connected and fixed by the inner rib member 81, and the portion corresponding to the outer rib member 82 is connected and fixed by the outer surface portion 422 and the outer rib member 82.

[0044] The electrical connection between the tab 30 and the battery cell 50 will be described in more detail below with reference to FIGS.

[0045] Fig. 6 is a plan view showing the connection and arrangement relationship between battery cells and tabs on the top surface of the second holder of the secondary battery module of Fig. 1, and Fig. 7 is a plan view showing the connection and arrangement relationship between battery cells and tabs on the bottom surface of the first holder of the secondary battery module of Fig. 1. Referring to Figs. 1, 2, 6 and 7, the multiple tabs 30 in the secondary battery module 1 enable multiple series connections and multiple parallel connections of battery cells 50.

[0046] The first tab members 31 are bent and placed on the upper and side surfaces of the second holder 20, and are bent and placed on the lower and side surfaces of the first holder 10, connecting the plurality of battery cells 50 in parallel.

[0047] The first tab member 31, which is a bent tab member, includes an inner flat surface portion 311 that is connected to the battery cell 50, and an inner side surface portion 312 that is bent relative to the inner flat surface portion 311 and disposed on the side surface of the first and second holders 10, 20.

[0048] The second tab members 32 (321, 322) are disposed on the upper surface of the second holder 20 and the lower surface of the first holder 10, and connect the plurality of battery cells 50 in a plurality of parallel and a plurality of series connections. In other words, the first tab member 31 and the second tab member 32 (321, 322) are arranged apart in the second direction (y-axis direction) with the battery cells 50 electrically connected in parallel and in series along the first direction (x-axis direction).

[0049] The first tab member 31 and the second tab member 32 (321, 322) are arranged sequentially along the second direction on the upper surface of the second holder 20, and are arranged sequentially along the opposite direction to the second direction in a symmetrical structure on the lower surface of the first holder 10, thereby electrically connecting the battery cells 50 in parallel and in series.

[0050] For convenience, the structure of the tabs 30 on the upper surface of the second holder 20 and the structure of the tabs 30 on the lower surface of the first holder 10 will both be described. The first tab member 31 electrically connects some of the plurality of battery cells 50 in parallel along the first direction. The second tab members 32 (321, 322) electrically connect some of the plurality of battery cells 50 in parallel along the first direction. The first and second tab members 31, 32 are arranged symmetrically on the upper surface of the second holder 20 and the lower surface of the first holder 10, thereby connecting the parallel connections in series.

[0051] For example, if a single first tab member 31 is provided on the upper surface of the second holder 20 or the lower surface of the first holder 10 and carries a positive or negative electrode, two second tab members 32 (321, 322) are provided and carry different polarities from the first tab member 31 and the adjacent second tab member 321, and the second tab members 321, 322 of the second tab member 32 also carry different polarities from each other.

[0052] That is, when the first tab member 31 is a positive electrode, the second tab member 321 adjacent to the first tab member 31 is a negative electrode, and the other second tab member 322 is a positive electrode. Conversely, when the first tab member 31 is a negative electrode, the second tab member 321 adjacent to the first tab member 31 is a positive electrode, and the other second tab member 322 is a negative electrode.

[0053] 1 to 3, at least one of the first holder 10 and the second holder 20 has a rib 61 protruding in the third direction. In the first embodiment, the rib 61 is provided on the second holder 20 located at the top in the state of the secondary battery module 1.

[0054] The ribs 61 are provided between the first tab member 31 and the second tab member 32, which have opposite polarities, and between the two second tab members 321, 322. One of the ribs 61 is disposed between the first tab member 31 and the second tab member 32, which have opposite polarities. The other rib 61 is disposed between the second tab member 321 and the second tab member 322, which have opposite polarities.

[0055] The rib 61 includes curved portions 611 and straight portions 612. The curved portions 611 are formed in a curve that follows the shape of the receiving holes of the second holder 20 that receive the cylindrical battery cells 50. The straight portions 612 connect adjacent curved portions 611 to each other in a straight line at the closest distance.

[0056] The rib 61 has a height (H, see Figure 3) protruding in the third direction, and the height (H) is formed to be greater than half the size (D1-D2) obtained by subtracting the diameter (D2) of the pillar from the diameter (D1, see Figure 2) of the head 62 (H>(D1-D2) / 2).

[0057] 4 or when the threaded portion 601 comes into contact with the first tab member 31 on one side, the head 62 does not come into contact with the adjacent second tab member 32. This prevents the first and second tab members 31, 32 from being short-circuited by the connecting member 60.

[0058] In addition, even if the connecting member 60 falls onto the rib 61, or even if the threaded portion 601 comes into contact with one second tab member 321, the head 62 does not come into contact with the other adjacent second tab member 322. This prevents the connecting member 60 from short-circuiting the second tab members 32 (321, 322).

[0059] The connecting member 60 is formed to be longer than the shortest distance (L) between the first tab member 31 and the second tab member 32 adjacent in the second direction (y-axis direction) and the shortest distance (L) between the second tab members 32 (321, 322).

[0060] Even if the connecting member 60 is formed longer than the minimum distance L, one side of the connecting member 60 is lifted and separated from the tab 30 by the rib 61, so that the connecting member 60 can prevent the tab 30 from short-circuiting.

[0061] Various embodiments of the present invention will be described below. Descriptions of the same components as those of the first embodiment and the previously described embodiments will be omitted, and only differences will be described.

[0062] 8 is a perspective view of a secondary battery module according to a second embodiment of the present invention. Referring to FIG. 8, in the secondary battery module 2 of the second embodiment, a plurality of outer rib members 282 are formed on the side of the holder 200 corresponding to the length of the outer side surface portion 422 of the second bus bar member 42 (see FIG. 8).

[0063] 1 and 2, in the secondary battery module 1 of the first embodiment, the outer rib member 82 is formed as a single member on the side of the holder 100 corresponding to the length of the outer side surface portion 422 of the second bus bar member 42.

[0064] In the secondary battery module 1 of the first embodiment, the inner and outer rib members 81 and 82 are formed on the second holder 20, which is the top holder. As an example, the inner and outer rib members 81 and 82 may be formed on the second holder 20 by injection molding.

[0065] In the secondary battery module 2 of the second embodiment, the inner and outer rib members 281 and 282 are formed on the first holder 210, which is the bottom holder. For example, the inner and outer rib members 281 and 282 may be formed on the first holder 210 by injection molding.

[0066] In the case of the secondary battery module 2 of the second embodiment, the inner and outer rib members 281, 282 may be formed to avoid the protrusion 11 of the first holder 210 and the coupling portion 12 of the second holder 20. In the first embodiment, the inner and outer rib members 81, 82 are formed on the second holder 20 depending on the usage situation of the secondary battery module 1. In the second embodiment, the inner and outer rib members 281, 282 are formed on the first holder 210 depending on the usage situation of the secondary battery module 2.

[0067] FIG. 9 is a perspective view of a secondary battery module according to a third embodiment of the present invention (in a state where the secondary battery module is combined with a case as a core pack), and FIG. 10 is a perspective view of a secondary battery module according to the third embodiment of the present invention (in a state where the secondary battery module is combined with a cover as a core pack).

[0068] 9 and 10, the secondary battery module 3 of the third embodiment is formed by incorporating two core packs 101 and 102 into a case 71 and covering it with a cover 72. The case 71 protects the core packs 101 and 102. Each of the core packs 101 and 102 can form multiple series connections and multiple parallel connections with multiple battery cells 50, and can also be formed with the secondary battery module 1 of the first embodiment or the secondary battery module 2 of the second embodiment.

[0069] When the core packs 101, 102 form multiple series connections and multiple parallel connections to the battery cells 50, the secondary battery module 3 requires high durability against external shocks because the voltage and current are high during use.

[0070] Figure 11 is a longitudinal cross-sectional view taken along line IX-IX in Figure 10. In the secondary battery module 3, a case 71 houses the first holder 10, and a cover 72 covers the second holder 20. The cover 72 has ribs 721 on its inner surface facing the battery cells 50. The ribs 721 are formed as regular hexagons on the xy plane with a height in the third direction and are repeatedly arranged in the first and second directions.

[0071] The ribs 721 increase the strength of the cover 72, making it highly durable against external impacts. In addition, in the event of a fire, such as a runaway battery cell 50, the ribs 721 facilitate gas release through the space formed between the inner surface of the cover 72 and the second holder 20, preventing the spread of fire to other adjacent battery cells 50.

[0072] 9 and 10, the busbar 40 (41, 42) connects the tab 30 to a battery management system (BMS) of FIG. 11. As an example, the busbar 40 includes a first busbar member 41 and a second busbar member 42. The core packs 101, 102 all include the first and second busbar members 41, 42.

[0073] In the case of adjacent core packs 101, 102, the second bus bar member 42 used in one core pack 101, 102 is connected on one side to the first tab member 31, which is a bent tab member, on the upper surface of the second holder 20, and is connected on the other side to the battery management system (BMS). The first bus bar member 41 is connected on one side to the second tab member 322, which is a plate-shaped tab member, on the upper surface of the second holder 20, and is connected on the other side to the battery management system (BMS).

[0074] Although the preferred embodiment of the present invention has been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the claims, the description of the invention, and the accompanying drawings, and it is to be understood that these modifications also fall within the scope of the present invention. [Explanation of symbols]

[0075] 1, 2, 3: Secondary battery module 10: First holder 11:Protrusion 12:Joining part 20: Second Holder 30: Tab 31: First tab member 32, 321, 322: second tab members 40: Busbar 41: First bus bar member 42: Second bus bar member 50: Battery cell 60: Connecting member 61: Rib 62:Head 71: Case 72: Cover 80: Rib 81: Inner rib member 82: Outer rib member 100, 200: Holder 101, 102: Core Pack 210: First Holder 220: Second Holder 281: Inner rib member 282: Outer rib member 311: Inner plane part 312:Inner side part 421: Outer plane part 422:Outer surface part 601: Threaded part 611: Curved part 612: Straight section 721: Rib BMS: Battery Management System D1, D2: Diameter G1: First gap G2: Second Gap H: Height L: Shortest separation distance L1: First length L2: Second length

Claims

1. a holder that houses a plurality of battery cells spaced apart in a first direction and a second direction that intersect with each other; a plurality of tabs electrically connecting the battery cells to each other; a bus bar connecting the tab to a battery management system (BMS), At least one of the tabs includes an inner flat portion and an inner side surface portion that is bent relative to the inner flat portion and fixed to a side surface of the holder, At least one of the bus bars includes an outer surface portion connected to the inner surface portion of the tab, and an outer flat surface portion bent relative to the outer surface portion and spaced apart from the inner flat surface portion, The holder includes an outer rib member that tightly contacts and fixes the inner surface portion of the tab and the outer surface portion of the bus bar.

2. An inner rib member forming an open structure toward the inner surface portion of the tab and connecting with the inner surface portion, The secondary battery module of claim 1 , wherein the outer rib member forms an open structure toward the outer surface portion of the bus bar and is coupled to the outer surface portion.

3. The secondary battery module of claim 2 , wherein the inner rib member and the outer rib member are integrally formed on a side surface of the holder and spaced apart from each other in the first direction.

4. the inner rib member defines a first gap inwardly at a side surface of the holder; The secondary battery module of claim 3 , wherein the outer rib member forms a second gap larger than the first gap and includes the first gap on the outer side of the holder.

5. The tab a first tab member having an inner flat surface portion disposed on an upper surface or a lower surface of the holder and connected to the battery cell, and an inner side surface portion bent relative to the inner flat surface portion and disposed on a side surface of the holder; second tab members disposed on the upper and lower surfaces of the holder to connect the battery cells; the inner surface portion of the first tab member is fixedly connected to the inner rib member; The secondary battery module according to claim 2 , wherein the second tab member connects battery cells that are not connected to the first tab member on the upper or lower surface of the holder.

6. The secondary battery module of claim 5 , wherein the inner rib member is formed on a side of the holder with a first length shorter than a length of the inner side surface portion, and fastens and fixes a portion of the entire length of the inner side surface portion.

7. the bus bar includes a first bus bar member and a second bus bar member, The second bus bar member is an outer planar surface facing the inner planar surface of the first tab member; the outer surface portion bent relative to the outer flat surface portion and connected to face the inner surface portion of the first tab member, The secondary battery module of claim 6 , wherein the outer surface portion of the second bus bar member is fixedly coupled to the outer rib member.

8. The outer surface portion is The secondary battery module according to claim 7 , wherein the outer rib member is connected to the inner side surface and adheres to the inner side surface at a surface thereof to apply pressure.

9. The secondary battery module of claim 8 , wherein the outer rib member is formed with a second length corresponding to the length of the outer side surface portion on the side surface of the holder and longer than the first length.

10. The portion of the inner surface portion corresponding to the outer rib member is The secondary battery module of claim 9 , wherein the secondary battery module is fixed by the outer side surface portion and the outer rib member.

11. The secondary battery module of claim 8 , wherein the outer rib member is formed in one or more lengths corresponding to the length of the outer side surface portion on the side surface of the holder.

12. The holder is a first holder that accommodates one side of a plurality of battery cells spaced apart in the first direction and the second direction that intersect with each other; a second holder that accommodates the other side of the battery cell; The secondary battery module of claim 1 , wherein the first holder and the second holder are coupled to each other with a snap-fit ​​structure.

13. The holder is a first holder that accommodates one side of a plurality of battery cells spaced apart in the first direction and the second direction that intersect with each other; a second holder that accommodates the other side of the battery cell and is coupled to the first holder, The outer rib member and the inner rib member are The secondary battery module of claim 2 , wherein the second holder is formed on one side of the first holder or the second holder.

14. a case that accommodates the lower side of the holder; a cover that covers the upper side of the holder, The cover is The secondary battery module according to claim 1 , further comprising corresponding ribs on an inner surface facing the battery cells.

15. The secondary battery module of claim 14 , wherein the ribs are formed in a regular hexagonal shape and are repeatedly arranged in the first direction and the second direction.

16. A holder for accommodating a plurality of battery cells spaced apart in a first direction and a second direction that intersect with each other; a plurality of tabs electrically connecting the battery cells to each other; a bus bar connecting the tab to a battery management system (BMS), At least one of the tabs includes an inner flat portion and an inner side surface portion that is bent relative to the inner flat portion and fixed to a side surface of the holder, At least one of the bus bars includes an outer surface portion connected to the inner surface portion of the tab, and an outer flat surface portion bent relative to the outer surface portion and spaced apart from the inner flat surface portion, the holder includes a rib that fixes at least one of the inner surface portion of the tab and the outer surface portion of the bus bar, The rib is an outer rib member that forms an open structure toward the outer surface portion of the bus bar and is coupled to the outer surface portion; The outer surface portion is A secondary battery module is connected to the outer rib member and adhered to the inner side surface portion at its surface to apply pressure.

Images