Battery module and battery pack including same

Abstract

A battery module according to an embodiment of the present invention includes a battery cell stack in which a plurality of battery cells, each including an electrode lead, are stacked, a busbar frame located on one side of the battery cell stack in a direction in which the electrode leads protrude, a busbar attached to the busbar frame, and a sensing assembly attached to the busbar frame and including a joining member. A first side of the busbar is joined to the electrode lead, and a second side of the busbar is joined to the joining member. The first side and the second side are opposite to each other.

Description

[Technical field]

[0001] Cross-reference to related applications This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0040650 dated March 29, 2021, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery module and a battery pack including the same, and more particularly to a battery module including a battery cell having wide electrode leads and a battery pack including the same. [Background technology]

[0003] In modern society, as the use of portable devices such as mobile phones, notebook computers, camcorders, and digital cameras has become commonplace, there has been active development of technology related to such mobile devices. In addition, rechargeable secondary batteries are a solution to address air pollution caused by existing gasoline-powered vehicles that use fossil fuels, and are used as the power source for electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), etc., so there is an increasing need for the development of secondary batteries.

[0004] Currently, commercial secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Of these, lithium secondary batteries are in the spotlight for their advantages over nickel-based secondary batteries, such as almost no memory effect, freedom in charging and discharging, a very low self-discharge rate, and high energy density.

[0005] Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive and negative active materials, respectively, and include an electrode assembly in which positive and negative plates coated with the positive and negative active materials are arranged with a separator between them, and a battery case that hermetically houses the electrode assembly together with an electrolyte.

[0006] Generally, lithium secondary batteries can be classified into can-type secondary batteries in which an electrode assembly is housed in a metal can and pouch-type secondary batteries in which an electrode assembly is housed in a pouch made of an aluminum laminate sheet, depending on the shape of the exterior material.

[0007] In the case of a secondary battery used in a small device, two or three battery cells are arranged, whereas in the case of a secondary battery used in a medium to large device such as an automobile, a battery module in which a plurality of battery cells are electrically connected is used. In such a battery module, a plurality of battery cells are connected to each other in series or parallel to form a battery cell stack, thereby improving capacity and output. In addition, one or more battery modules may be mounted with various control and protection systems such as a BMS (Battery Management System) and a cooling system to form a battery pack.

[0008] Fig. 1 is a partial perspective view showing the inside of a conventional battery module. Fig. 2 is a plan view of the battery module of Fig. 1 as seen from the front. Fig. 3 is an exploded perspective view showing battery cells and bus bar frames included in the battery module of Fig. 1. In particular, in Fig. 3, the module frame 50 of Fig. 1 is omitted.

[0009] 1 to 3, a conventional battery module 10 includes a plurality of battery cells 11 and a bus bar 30 for electrically connecting the battery cells 11. Specifically, the bus bar 30 can be attached to a bus bar frame 20, and an electrode lead 11L of the battery cell 11 can be passed through a slit formed in the bus bar frame 20 and then bent to be joined to the bus bar 30.

[0010] Meanwhile, a sensing assembly 40 including a module connector 41 can be attached to the bus bar frame 20. In particular, the sensing assembly 40 including the module connector 41 can be attached to the upper end of the bus bar frame 20. Voltage information of the battery cells 11 can be transmitted to an external BMS (Battery Management System) through the module connector 41. To this end, a joining member 43 connected to the module connector 41 is joined to the bus bar 30 to which the electrode lead 11L is joined.

[0011] At this time, the electrode lead 11L and the joining member 43 can be joined to the outer surface of the bus bar 30. There are no particular limitations on the joining method, and welding can be used as an example. The electrode lead 11L and the joining member 43 can be positioned on the same side of the bus bar 30 and joined. As a result, a region in which the joining member 43 can be joined must be provided, and therefore the width of the electrode lead 11L cannot be greatly increased. This will be described in detail with reference to FIG. 4.

[0012] FIG. 4 is an enlarged partial view of part "A" in FIG.

[0013] 1 to 4, since an area to which the joining member 43 can be joined other than the electrode lead 11L must be provided on the outer surface of the bus bar 30, the width W1 of the electrode lead 11L cannot be increased significantly. Here, the width W1 of the electrode lead 11L refers to the length in the z-axis direction relative to the electrode lead 11L. That is, a so-called sensing area SA must be provided on the upper part of the electrode lead 11L, and the width W1 of the electrode lead 11L is limited by this sensing area SA. The sensing area SA collectively refers to an area where the sensing assembly 40 including the module connector 41 is located and an area where the joining member 43 connected to the module connector 41 is attached to the bus bar 30.

[0014] Recently, there has been growing interest in battery modules and battery packs with excellent quick charging performance. However, as quick charging performance has improved, the battery cells included in the battery module have become more vulnerable to heat generation than before. In particular, the electrode lead parts of the battery cells generate a lot of heat when repeatedly charging and discharging.

[0015] One method to solve the heat generation problem of the battery cells is to expand the electrode leads of the battery cells more than before to reduce the resistance of the battery cells and reduce the amount of heat generated. However, as described above, the conventional battery module 10 has a problem that the width W1 of the electrode leads 11L is limited by the sensing area SA, making it difficult to greatly expand the width W1 of the electrode leads 11L.

[0016] Therefore, there is a need to develop a battery module having a new connection structure that can increase the width of the electrode leads. Summary of the Invention [Problem to be solved by the invention]

[0017] An object of the present invention is to provide a battery module having a novel connection structure capable of increasing the width of an electrode lead in order to reduce heat generation, and a battery pack including the same.

[0018] However, the problems to be solved by the embodiments of the present invention are not limited to the above problems, and can be variously expanded within the scope of the technical ideas included in the present invention. [Means for solving the problem]

[0019] A battery module according to an embodiment of the present invention includes a battery cell stack in which a plurality of battery cells, each including an electrode lead, are stacked, a busbar frame located on one side of the battery cell stack in a direction in which the electrode leads protrude, a busbar attached to the busbar frame, and a sensing assembly including a joining member attached to the busbar frame. A first side of the busbar is joined to the electrode lead, and a second side of the busbar is joined to the joining member. The first side and the second side are opposite to each other.

[0020] The busbar frame may be disposed between the busbar and the battery cell stack, and a slit may be formed in the busbar frame. The electrode lead may pass through the slit and be joined to the first surface of the busbar.

[0021] The second surface of the bus bar may be a surface that comes into contact with the bus bar frame.

[0022] The bus bar frame may be disposed between the sensing assembly and the battery cell stack, and the joining members of the sensing assembly may be disposed between the bus bar and the bus bar frame.

[0023] A through hole may be formed in a portion of the bus bar frame corresponding to a portion where the joining member and the second surface are joined.

[0024] The bus bar frame may include a mounting portion in which the bus bar is located. The mounting portion may have a recessed shape with respect to a surface in which the bus bar is located, or may have a protruding shape with respect to a surface in which the battery cell stack is located.

[0025] The bus bar and the mounting portion may be formed in a plurality of pieces, and a slit through which the electrode lead passes may be formed between the mounting portions.

[0026] In a surface of the bus bar frame in a direction in which the battery cell stack is located, a distance between adjacent mounting portions may become gradually wider in a direction in which the battery cell stack is located.

[0027] The sensing assembly may further include a module connector and a connecting cable connecting the module connector and the joining member.

[0028] The module connector and the connecting cable may be disposed on an upper end of the bus bar frame. Effect of the Invention

[0029] According to an embodiment of the present invention, the back surface of the bus bar is connected to the sensing assembly, thereby increasing the area where the electrode lead and the bus bar are joined.

[0030] This allows the width of the electrode leads to be significantly increased, thereby reducing the resistance and heat generation of the battery cell.

[0031] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief description of the drawings]

[0032] [Figure 1] FIG. 11 is a partial perspective view showing the inside of a conventional battery module. [Diagram 2] FIG. 2 is a plan view of the battery module of FIG. 1 as seen from the front. [Diagram 3] 2 is an exploded perspective view showing a battery cell and a bus bar frame included in the battery module of FIG. 1. [Figure 4] FIG. 4 is an enlarged partial view of part “A” in FIG. 3. [Diagram 5] 1 is an exploded perspective view showing a battery module according to an embodiment of the present invention; [Figure 6] 6 is a perspective view showing a battery cell included in the battery module of FIG. 5. [Figure 7] 6 is a perspective view showing a bus bar frame, a bus bar, and a sensing assembly included in the battery module of FIG. 5. [Figure 8] FIG. 8 is an enlarged partial perspective view of the bus bar and sensing assembly of FIG. 7. [Figure 9] 11 is a perspective view illustrating a process in which an electrode lead of a battery cell is joined to a bus bar. FIG. [Figure 10] FIG. 2 is a perspective view showing a joint member according to an embodiment of the present invention. [Figure 11] FIG. 6 is an enlarged partial view of part “B” in FIG. 5. [Figure 12] 6 is a partial cross-sectional view showing a cross section taken along the line CC' in FIG. 5. [Figure 13] FIG. 8 is a perspective view showing the bus bar frame of FIG. 7 turned over. [Figure 14] FIG. 14 is an enlarged partial view of part “D” in FIG. 13. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention may, however, be embodied in various different forms and should not be construed as being limited to the embodiments set forth herein.

[0034] In order to clearly explain the present invention, parts that are not necessary for the explanation will be omitted, and the same reference numerals will be used throughout the specification to refer to the same or similar components.

[0035] In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and the present invention is not necessarily limited to those shown in the drawings. In the drawings, the thicknesses of various layers and regions are exaggerated to clearly express the layers and regions. In the drawings, the thicknesses of some layers and regions are exaggerated to facilitate explanation.

[0036] In addition, when a part such as a layer, film, region, or plate is said to be "on" or "above" another part, this includes not only the case where it is "directly on" another part, but also the case where there is another part in between. Conversely, when a part is said to be "directly on" another part, it means that there is no other part in between. In addition, being "on" or "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "on" or "above" the direction against gravity.

[0037] Additionally, throughout the specification, when a part is said to "comprise" a certain element, this means that it may further include other elements, but not excluding other elements, unless specifically stated to the contrary.

[0038] Also, throughout the specification, the term "in a plane" means when the subject part is viewed from above, and the term "in cross section" means when the subject part is cut vertically and viewed from the side.

[0039] Fig. 5 is an exploded perspective view of a battery module according to an embodiment of the present invention, and Fig. 6 is a perspective view of a battery cell included in the battery module of Fig. 5.

[0040] 5 and 6, a battery module 100 according to an embodiment of the present invention includes a battery cell stack 120 in which a plurality of battery cells 110 including electrode leads 111, 112 are stacked, and a bus bar frame 200 located on one side of the battery cell stack 120 in a direction in which the electrode leads 111, 112 protrude. Although not specifically shown, the battery cell stack 120 and the bus bar frame 200 can be housed inside a module frame (not shown). Such a module frame can include a metal material having a predetermined strength so as to protect the battery cell stack 120, the bus bar frame 200, and other electrical components from the outside.

[0041] The battery cell 110 is preferably a pouch-type battery cell and may be formed in a rectangular sheet-type structure. For example, the battery cell 110 according to this embodiment has a structure in which two electrode leads 111 and 112 face each other and protrude from one end 114a and the other end 114b of a cell body 113, respectively. That is, the battery cell 110 includes electrode leads 111 and 112 protruding in directions opposite to each other. More specifically, the electrode leads 111 and 112 are connected to an electrode assembly (not shown) and protrude from the electrode assembly (not shown) to the outside of the battery cell 110.

[0042] Meanwhile, the battery cell 110 can be manufactured by bonding both ends 114a, 114b of the cell case 114 and one side 114c connecting them in a state where an electrode assembly (not shown) is housed in the cell case 114. In other words, the battery cell 110 according to this embodiment has a total of three sealing parts, which are structured to be sealed by a method such as heat fusion, and the other side can be a connecting part 115. The cell case 114 can be made of a laminate sheet including a resin layer and a metal layer.

[0043] Such a battery cell 110 may be configured in a plurality of units, and the plurality of battery cells 110 may be stacked so as to be electrically connected to each other to form a battery cell stack 120. In particular, as shown in FIG. 5, the plurality of battery cells 110 may be stacked along the y-axis direction. As a result, the electrode leads 111, 112 each protrude in the vertical direction (x-axis direction and -x-axis direction). Although not specifically shown, an adhesive member may be disposed between the battery cells 110. As a result, the battery cells 110 may be bonded to each other to form the battery cell stack 120.

[0044] A bus bar frame 200 may be disposed on one side of the battery cell stack 120 in a direction in which the electrode leads 111, 112 protrude. In addition, a bus bar frame 200 may be disposed on the other side of the battery cell stack 120 in a direction in which the electrode leads 111, 112 protrude. That is, a bus bar frame 200 may be disposed on each of the front and rear surfaces of the battery cell stack 120.

[0045] The bus bar and the bus bar frame according to this embodiment will be described in detail below with reference to Figs.

[0046] Fig. 7 is a perspective view showing a bus bar frame, a bus bar, and a sensing assembly included in the battery module of Fig. 5. Fig. 8 is a partial perspective view showing an enlarged view of the bus bar and the sensing assembly of Fig. 7. Fig. 9 is a perspective view for explaining a process in which electrode leads of a battery cell are joined to a bus bar. In particular, for convenience of explanation, Fig. 9 shows only two electrode leads, and other parts of the battery cell except for the electrode leads are not shown.

[0047] 5 and 7 to 9, a battery module 100 according to the present embodiment includes a bus bar 300 mounted on a bus bar frame 200, and a sensing assembly 400. A first surface 310 of the bus bar 300 is joined to electrode leads 111, 112, and a second surface 320 of the bus bar 300 is joined to a joining member 430 of the sensing assembly 400. The first surface 310 and the second surface 320 of the bus bar 300 are surfaces facing each other. That is, the first surface 310 may be a front surface of the bus bar 300, and the second surface 320 may be a back surface of the bus bar 300.

[0048] The busbar frame 200 may be disposed between the busbar 300 and the battery cell stack 120. In other words, the busbar 300 may be attached to a surface of the busbar frame 200 opposite to a surface facing the battery cell stack 120. A slit 200S may be formed in the busbar frame 200. As shown in FIG. 9 , the electrode leads 111 of the battery cells may pass through the slit 200S and then be joined to a first surface 310 of the busbar 300. The electrode lead 111 of any one battery cell and the electrode lead 111 of the other battery cell each pass through the slit 200S and are then bent toward any one busbar 300. At least two battery cells may be electrically connected via the busbar 300.

[0049] First surface 310 of bus bar 300 may be the surface to which electrode leads 111, 112 are joined, and second surface 320 of bus bar 300 may be the surface that comes into contact with bus bar frame 200.

[0050] Meanwhile, the sensing assembly 400 according to the present embodiment is for a low voltage (LV) connection, where the LV connection means a sensing connection for sensing and controlling the voltage of a battery cell. Through the sensing assembly 400, voltage information and temperature information of the battery cell 110 can be measured and transmitted to an external BMS (Battery Management System).

[0051] Such a sensing assembly 400 may include a module connector 410 , an interconnecting cable 420 , and a mating member 430 .

[0052] The module connector 410 can be configured to send and receive signals to and from an external control device for controlling the multiple battery cells 110 .

[0053] The connecting cable 420 is a member that connects the module connector 410 and the joint member 430, and may be a flexible printed circuit board (FPCB) or a flexible flat cable (FFC). The module connector 410 and the connecting cable 420 may be disposed on the upper end of the bus bar frame 200.

[0054] The joining member 430 includes a metal material having battery conductivity, and is joined to the second surface 320 of the bus bar 300 .

[0055] FIG. 10 is a perspective view showing a joint member according to an embodiment of the present invention.

[0056] 10, one side 430P of the connecting member 430 according to an embodiment of the present invention is connected to the second surface 320 of the bus bar 300, and the other side 430C is connected to the connecting cable 420. In particular, the one side 430P of the connecting member 430 is formed in a plate shape and can be joined to the second surface 320 of the bus bar 300 by a method such as welding after being brought into close contact with the second surface 320 of the bus bar 300. Meanwhile, the other side 430C of the connecting member 430 can be coupled to the connecting cable 420 by passing through the connecting cable 420 and then being bent.

[0057] Voltage information for the plurality of battery cells 110 can be transmitted to an external BMS (Battery Management System) through the joining member 430, the connection cable 420, and the module connector 410 in sequence. That is, the sensing assembly 400 can detect and control phenomena such as overvoltage, overcurrent, and overheating of each battery cell 110.

[0058] 5 and 7 to 9 again, the bus bar frame 200 may be disposed between the sensing assembly 400 and the battery cell stack 120. In other words, the sensing assembly 400 may be attached to the surface of the bus bar frame 200 opposite to the surface facing the battery cell stack 120. In addition, the joining member 430 of the sensing assembly 400 may be disposed between the bus bar 300 and the bus bar frame 200. As described above, the joining member 430 may be joined to the second surface 320 of the bus bar 300.

[0059] In summary, the electrode leads 111, 112 and the joint member 430 are respectively joined to opposing surfaces of the bus bar 300, i.e., the first surface 310 and the second surface 320. Hereinafter, advantages of the joint relationship according to this embodiment will be described in comparison with the conventional battery module 10 with reference to Fig. 11 etc. Fig. 11 is a partial view showing an enlarged view of part "B" in Fig. 5.

[0060] First, as shown in FIG. 4, in the conventional battery module 10, the width W1 of the electrode lead 11L is difficult to increase due to the sensing area SA. On the other hand, as shown in FIGS. 7 and 9, in the battery module 100 according to the present embodiment, the joining member 430 and the electrode lead 111 are joined to the bus bar 300 while being positioned on opposite sides of each other. Therefore, it is not necessary to reduce the width W2 of the electrode lead 111 in order to provide an area where the joining member 430 and the bus bar 300 can be joined. The width W2 of the electrode lead 111 can be greatly increased compared to the conventional embodiment. Here, the width W2 of the electrode lead 111 refers to the length of the electrode lead 111 in the z-axis direction. The battery module 100 according to the present embodiment has an advantage that the resistance and heat generation of the battery cell 110 can be reduced because the width W2 of the electrode lead 111 can be greatly increased.

[0061] The mounting portion according to this embodiment will be described in detail below with reference to FIG.

[0062] FIG. 12 is a partial cross-sectional view showing a cross section taken along the line CC' in FIG.

[0063] 5, 7, 9, and 12, the bus bar frame 200 according to the present embodiment includes a mounting portion 200M in which the bus bar 300 is located. A plurality of bus bars 300 can be mounted to the bus bar frame 200, and thus a plurality of mounting portions 200M can be formed. The mounting portion 200M according to the present embodiment is recessed with respect to a surface in the direction d1 in which the bus bar 300 is located, and may be protruded with respect to a surface in the direction d2 in which the battery cell stack 120 is located. That is, the mounting portion 200M may be in the form of a basket that is open in the direction d1 in which the bus bar 300 is located.

[0064] The bus bar frame 200 preferably includes an electrically insulating material, and as an example, a plastic material can be used. When the electrode lead 111 and the bus bar 300 are joined, welding, particularly laser welding, can be used. Considering the material of the bus bar frame 200, the welding may cause damage to the bus bar frame 200. Therefore, in the present embodiment, the mounting part 200M is configured to have a recessed shape based on the plane of the direction d1 on which the bus bar 300 is located. Since the mounting part 200M is separated from the area where welding is performed, direct damage can be prevented. In addition, the bus bar frame 200 may be an injection product manufactured by injection molding. At this time, if the internal space is completely filled, a shrinkage phenomenon may occur, so in the present embodiment, the mounting part 200M is configured to have a recessed shape to form an empty space.

[0065] Meanwhile, as one example, bus bar 300 is inserted into the empty space, but if it is fully inserted, a problem may occur during the welding process with electrode lead 111. Therefore, it is preferable that bus bar 300 is not fully inserted, but rather protrudes slightly in the d1 direction as shown in FIG.

[0066] Meanwhile, as described above, bus bar 300 and mounting portion 200M can be configured in a plurality of pieces. Slit 200S through which electrode lead 111 can pass can be formed between such mounting portions 200M.

[0067] At this time, the mounting parts 200M may be in a protruding shape based on the surface in the direction d2 in which the battery cell stack 120 is located, as described above. Also, on the surface in the direction d2 in which the battery cell stack 120 is located in the bus bar frame 200, the interval between adjacent mounting parts 200M may gradually increase in the direction d2 in which the battery cell stack 120 is located. Because the mounting parts 200M have the above-described shape, when the bus bar frame 200 is disposed on one side of the battery cell stack 120, the electrode leads 111 are easily inserted into the slits 200S by passing between the mounting parts 200M. That is, the protruding mounting parts 200M may function as a kind of guide so that the electrode leads 111 can easily pass through the slits 200S.

[0068] Meanwhile, when the bus bar frame 200 is disposed on one side of the battery cell stack 120, the protruding portion of the mounting portion 200M can fill the space between the electrode leads 111 of the adjacent battery cells 110.

[0069] Gas may be generated inside the battery cell 110 due to the decomposition reaction of materials and various side reactions. In the case of a pouch-type secondary battery battery cell 110, the gas generated inside may cause the cell case 114 (see FIG. 6) of the laminate sheet to stretch and swell, resulting in a swelling phenomenon.

[0070] However, when the battery cells 110 constitute the battery cell stack 120, swelling is unlikely to occur in the cell body 113 of the battery cells 110 because the battery cells 110 are pressed against each other. Instead, gas may concentrate in the area of ​​one end 114a and the other end 114b in the direction in which the electrode leads 111 and 112 protrude. Eventually, the initial seal of the area of ​​the one end 114a and the other end 114b may be released, and high-temperature heat, gas, and flames generated from the multiple battery cells 110 may be discharged in the direction in which the electrode leads 111 and 112 protrude.

[0071] The mounting portion 200M of the bus bar frame 200 according to this embodiment is disposed to fill the space between the electrode leads 111 of the adjacent battery cells 110, thereby preventing gas from concentrating in the areas of one end 114a and the other end 114b of the battery cell 110. In addition, the mounting portion 200M can restrict high temperature heat and gas generated inside (from?) the battery cell 110 from being discharged in the direction in which the bus bar frame 200 is located.

[0072] Hereinafter, the through-holes 200H formed in the bus bar frame 200 according to the present embodiment will be described in detail with reference to FIGS.

[0073] Fig. 13 is a perspective view showing the bus bar frame of Fig. 7 turned upside down. Fig. 14 is a partial view showing an enlarged view of part "D" of Fig. 13.

[0074] 7, 8, 13 and 14, through holes 200H may be formed in a portion of bus bar frame 200 corresponding to a portion where joining member 430 and second surface 320 of bus bar 300 are joined. Joining member 430 and second surface 320 may be joined by welding (W) through such through holes 200H. Prior to joining electrode lead 111 and bus bar 300, joining member 430 and bus bar 300 may be preferentially joined through through holes 200H. If through holes 200H are not formed, joining member 430 may be covered by bus bar 300, making it difficult to weld at an accurate position.

[0075] In this embodiment, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are merely for convenience of explanation and may change depending on the position of the target object, the position of the observer, etc.

[0076] One or more battery modules according to the above-described exemplary embodiments may be mounted together with various control and protection systems, such as a Battery Management System (BMS), a Battery Disconnect Unit (BDU), and a cooling system, to form a battery pack.

[0077] The battery module or battery pack may be applied to various devices, specifically, transportation means such as electric bicycles, electric cars, and hybrid vehicles, but is not limited thereto, and may be applied to various devices that can use secondary batteries.

[0078] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention. [Explanation of symbols]

[0079] 100: Battery module 120: Battery cell stack 200: Busbar frame 300: Busbar 400: Sensing assembly

Claims

1. a battery cell stack in which a plurality of battery cells, each including an electrode lead, are stacked; a bus bar frame located on one surface of the battery cell stack in a direction in which the electrode leads protrude; A bus bar attached to the bus bar frame; and a sensing assembly attached to the bus bar frame and including a joining member; a first surface of the bus bar and the electrode lead are joined, and a second surface of the bus bar and the joining member are joined, the first surface and the second surface are surfaces opposed to each other, the bus bar frame is located between the bus bar and the battery cell stack; A slit is formed in the bus bar frame, the electrode lead passes through the slit and is joined to the first surface of the bus bar.

2. The battery module according to claim 1 , wherein the second surface of the bus bar is a surface that contacts the bus bar frame.

3. the bus bar frame is located between the sensing assembly and the battery cell stack; The battery module according to claim 1 , wherein the joint member of the sensing assembly is located between the bus bar and the bus bar frame.

4. The battery module according to claim 1 , wherein a through hole is formed in a portion of the bus bar frame corresponding to a portion where the joining member and the second surface are joined.

5. the bus bar frame includes a mounting portion in which the bus bar is positioned, 5. The battery module according to claim 1, wherein the mounting portion has a recessed shape with respect to a surface in a direction in which the bus bar is located, and a protruding shape with respect to a surface in a direction in which the battery cell stack is located.

6. A battery cell stack in which a plurality of battery cells each including an electrode lead are stacked. a bus bar frame located on one surface of the battery cell stack in a direction in which the electrode leads protrude; A bus bar attached to the bus bar frame; and a sensing assembly attached to the bus bar frame and including a joining member; a first surface of the bus bar and the electrode lead are joined, and a second surface of the bus bar and the joining member are joined, the first surface and the second surface are surfaces opposed to each other, the bus bar frame includes a mounting portion in which the bus bar is positioned, the mounting portion has a recessed shape with respect to a surface in a direction in which the bus bar is located and a protruding shape with respect to a surface in a direction in which the battery cell stack is located, The bus bar and the mounting portion are configured in plurality, The battery module has a slit formed between the mounting portions through which the electrode leads pass.

7. a surface of the bus bar frame in a direction in which the battery cell stack is located, The battery module according to claim 5 or 6, wherein the interval between the adjacent mounting portions becomes gradually wider in a direction toward which the battery cell stack is located.

8. The battery module according to claim 1 , wherein the sensing assembly further includes a module connector and a connecting cable connecting the module connector and the joining member.

9. The battery module according to claim 8 , wherein the module connector and the connecting cable are located at an upper end of the bus bar frame.

10. A battery pack comprising a battery module according to any one of claims 1 to 9.

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