Battery module and battery pack including same

Abstract

A battery module according to one embodiment of the present invention includes: a battery cell stack in which a plurality of battery cells are stacked; a module case for accommodating the battery cell stack; a bus bar frame disposed on one side of the battery cell stack; and two insulating covers disposed on both sides of the battery cell stack; one of the two insulating covers includes a pressure pad, and the other insulating cover is disposed on the outside of the bus bar frame, and the pressure pad of one insulating cover presses the battery cell stack in the direction of the other insulating cover disposed on the outside of the bus bar frame.

Description

[Technical Field]

[0001] The present invention relates to a battery module and a battery pack including the same, and more particularly to a battery module in which the hole position accuracy of a terminal bus bar is improved, and a battery pack including the same. [Background technology]

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries that can be charged and discharged. They are used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs), which are powered by electrical sources.

[0003] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is approximately 2.5V to 4.6V. Therefore, if a higher output voltage is required, a battery pack is constructed by connecting multiple battery cells in series. Alternatively, a battery pack may be constructed by connecting multiple battery cells in parallel depending on the required charge / discharge capacity of the battery pack. Therefore, the number of battery cells included in the battery pack can be variously set depending on the required output voltage or charge / discharge capacity.

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

[0005] In a battery module, there is a possibility that a cell block consisting of a plurality of battery cells may move within a space between the module frame and the cell block. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a battery module and a battery pack including the same that can restrict the position of a cell block and improve the positional accuracy of a terminal hole. [Means for solving the problem]

[0007] A battery module according to one embodiment of the present invention includes: a battery cell stack in which a plurality of battery cells are stacked; a module case for accommodating the battery cell stack; a bus bar frame disposed on one side of the battery cell stack; and two insulating covers disposed on both sides of the battery cell stack; one of the two insulating covers includes a pressure pad, and the other insulating cover is disposed on the outside of the bus bar frame, and the pressure pad of one insulating cover presses the battery cell stack in the direction of the other insulating cover disposed on the outside of the bus bar frame.

[0008] The pressure pad is disposed on an inner surface of the one insulating cover facing the battery cell stack.

[0009] The pressure pad may also be compressed.

[0010] The pressure pad is made of a foam pad.

[0011] Furthermore, a plurality of the pressure pads are arranged inside the single insulating cover.

[0012] The bus bar frame may also include a protrusion, which may abut against the remaining one insulating cover.

[0013] The bus bar frame is disposed on both sides of the battery cell stack, and the two insulating covers are disposed on the outside of the bus bar frame on both sides of the battery cell stack.

[0014] The electric power train further includes a plurality of bus bars disposed on the bus bar frame.

[0015] The end of the pressure pad is disposed between the bus bars.

[0016] The bus bar frame further includes ribs disposed between the bus bars.

[0017] The pressure pad also applies pressure to the rib.

[0018] The pressure pad extends vertically inside the one insulating cover.

[0019] In addition, the battery module according to an embodiment of the present invention further includes: a terminal bus bar disposed on the bus bar frame; and a fixing member having a fixing hole for fixing one end of the terminal bus bar, the fixing member being disposed below the one remaining insulating cover and one end of the terminal bus bar.

[0020] Furthermore, the battery module according to an embodiment of the present invention further includes an end plate disposed outside the remaining insulating cover and having a terminal opening through which one end of the terminal bus bar is exposed.

[0021] The terminal bus bar also includes a coupling hole disposed at one end thereof.

[0022] The device further includes two end plates disposed on the outsides of the two insulating covers, respectively.

[0023] A battery module according to an embodiment of the present invention includes: a battery cell stack in which a plurality of battery cells are stacked; a module case for accommodating the battery cell stack; a bus bar frame disposed on one side of the battery cell stack; and an insulating cover disposed on the outside of the bus bar frame; and the bus bar frame includes protrusions that abut the insulating cover. [Effects of the Invention]

[0024] The battery module and pack according to an embodiment of the present invention has the effect of constraining the position of the cell block and improving the hole position accuracy of the terminal bus bar. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view of a battery module according to an embodiment of the present invention; [Figure 2] 1 is an exploded perspective view of a battery module according to an embodiment of the present invention; [Figure 3] FIG. 1 is a perspective view of a battery cell according to an embodiment of the present invention. [Figure 4] FIG. 2 is a perspective view of a terminal bus bar according to an embodiment of the present invention. [Figure 5] FIG. 2 is a perspective view of an insulating cover and an end plate according to an embodiment of the present invention. [Figure 6]FIG. 2 is a perspective view of an insulating cover according to an embodiment of the present invention. [Figure 7] 10 is a diagram showing an insulating cover and end plates coupled to both sides of a battery cell stack in accordance with an embodiment of the present invention. FIG. [Figure 8] 10 is a diagram showing a state in which an insulating cover is coupled to a bus bar frame in one embodiment of the present invention. FIG. [Figure 9] FIG. 2 is a partial plan view of a bus bar frame and an insulating cover according to an embodiment of the present invention. [Figure 10] FIG. 2 is a partial perspective view of a bus bar frame and an insulating cover according to an embodiment of the present invention. [Figure 11] 10 is a diagram showing a state in which the holes of the terminal bus bar are accurately positioned in one embodiment of the present invention. FIG. [Figure 12] 1 illustrates a battery pack according to one embodiment of the present invention. [Figure 13] 1 is a perspective view of a vehicle equipped with a battery pack according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] The advantages and features of the present invention, as well as methods for achieving them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various different forms. However, the present embodiments are provided to complete the disclosure of the present invention and fully convey the scope of the invention to those skilled in the art. The present invention is defined only by the scope of the claims. Therefore, in some embodiments, known process steps, known device structures, and known techniques are not specifically described to avoid ambiguous interpretation of the present invention. The same reference numerals refer to the same elements throughout the specification.

[0027] In the drawings, thickness may be exaggerated to clearly show multiple layers or regions. Similar parts are given the same drawing symbols throughout the specification. When a layer, film, region, plate, or other part is said to be "on" another part, this includes not only when it is "directly on" the other part, but also when there are other parts between them. Conversely, when a part is said to be "directly above" another part, it means that there are no other parts between them. Furthermore, when a layer, film, region, plate, or other part is said to be "under" another part, this includes not only when it is "directly below" the other part, but also when there are other parts between them. Conversely, when a part is said to be "directly below" another part, it means that there are no other parts between them.

[0028] A battery module 1000 according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0029] FIG. 1 is a perspective view of a battery module according to the present invention, FIG. 2 is an exploded perspective view of a battery module according to the present invention, FIG. 3 is a perspective view of a battery cell according to the present invention, FIG. 4 is a perspective view of a terminal bus bar according to the present invention, FIG. 5 is a perspective view of an insulating cover and an end plate according to the present invention, FIG. 6 is a perspective view of an insulating cover according to the present invention, FIG. 7 is a diagram showing that insulating covers and end plates are attached to both sides of a battery cell stack according to the present invention, FIG. 8 is a diagram showing that an insulating cover is attached to a bus bar frame according to the present invention, FIG. 9 is a partial plan view of a bus bar frame and an insulating cover according to one embodiment of the present invention, FIG. 10 is a partial perspective view of a bus bar frame and an insulating cover according to one embodiment of the present invention, and FIG. 11 is a diagram showing that terminal bus bar holes are accurately positioned according to one embodiment of the present invention.

[0030] A battery module 1000 according to one embodiment of the present invention may include a battery cell stack 100 in which a plurality of battery cells 110 are stacked, a module case 200 that houses the battery cell stack 100, bus bar frames 300, 301 located on one and / or the other side of the battery cell stack 100, insulating covers 500, 501 arranged on the outside of the bus bar frames 300, 301, and end plates 400, 401 arranged on the outside of the insulating covers 500, 501.

[0031] The battery cell stack 100 may be formed by stacking a plurality of battery cells 110 in one direction, and the plurality of battery cells 110 may be electrically connected to each other. The direction in which the plurality of battery cells 110 are stacked may be the X-axis direction (or the −X-axis direction) in FIG. 2.

[0032] The direction from the front surface to the rear surface of the battery cell stack 100, or the reverse direction, may be defined as the length direction of the battery cell stack 100, which may be the Y-axis direction in the drawing. Also, the direction from the top surface to the bottom surface of the battery cell stack 100, or the reverse direction, may be defined as the width direction of the battery cell stack 100, which may be the Z-axis direction in the drawing.

[0033] The length direction of the battery cell stack 100 may be substantially the same as the length direction of the battery cells 110. The electrode leads 111, 112 of the battery cells 110 may be located on the front and rear surfaces of the battery cell stack 100, and the bus bars 310, 320 of the battery module 1000 may be disposed near the front and rear surfaces of the battery cell stack 100 so as to easily form electrical connections with the electrode leads 111, 112.

[0034] The battery cells 110 may be provided as pouch-type battery cells, which allows the number of battery cells stacked per unit area to be maximized. However, the battery cells 110 do not necessarily have to be provided in a pouch-type, and may be provided in various other shapes such as a rectangular shape, a cylindrical shape, or the like.

[0035] The battery cell 110 provided in a pouch form may include an electrode assembly and a cell case 115 that houses the electrode assembly (see FIG. 3).

[0036] The cell case 115 of the battery cell 110 is for housing the electrode assembly and may be a pouch-type cell case 115. The cell case 115 includes a lower case and an upper case covering the lower case, and the upper case may be integrally formed. Alternatively, as shown in FIG. 3, the upper case may have a folding structure in which the connecting portion is bent. As shown, the upper case may completely cover the lower case, and a sealing portion 114 may be formed around the periphery.

[0037] Both the upper and lower cases may have a laminate structure including an inner coating layer, a metal layer, and an outer coating layer. The inner coating layer is located inside the cell case 115 relative to the metal layer and directly contacts the electrode assembly, so it must be insulating and electrolytic-resistant. Furthermore, the sealing properties, i.e., the sealing portion where the inner layers are thermally bonded together, must have excellent thermal adhesive strength to seal the battery from the outside. The metal layer is located between the inner and outer coating layers and serves as a barrier layer to prevent moisture and various gases from penetrating into the battery from the outside. A preferred material for the metal layer in contact with the inner coating layer is an aluminum (Al) thin film, which is lightweight and easy to form. The outer coating layer is located outside the cell case 115 relative to the metal layer. This outer coating layer can be made of a heat-resistant polymer with excellent tensile strength, moisture-proof properties, and air-proof properties to protect the electrode assembly while ensuring heat resistance and chemical resistance. For example, nylon or polyethylene terephthalate may be used.

[0038] The upper and lower cases may each have a receiving groove 116 formed therein, and the electrode assembly may be received in the receiving groove 116 of the upper and lower cases.

[0039] The electrode assembly housed in the cell case 115 may be any one of a group consisting of a jelly-roll type electrode assembly having a structure in which a separator is sandwiched between long sheet-like positive and negative electrodes and then wound up; a stack type electrode assembly consisting of unit cells having a structure in which rectangular positive and negative electrodes are stacked with a separator sandwiched between them; a stack-folding type electrode assembly in which unit cells are wound up with a long separator film; and a lamination-stack type electrode assembly in which unit cells are stacked with a separator sandwiched between them and then attached to each other.

[0040] The electrode assembly may also include two electrode tabs and two electrode leads 111, 112 connected to the electrode tabs by welds, respectively.

[0041] One of the two electrode leads 111, 112 may be a positive electrode lead connected to a positive electrode tab, and the other electrode lead 111, 112 may be a negative electrode lead connected to a negative electrode tab.

[0042] A lead film 113 may be attached to each of the electrode leads 111 and 112. The lead film 113 connected to the electrode leads 111 and 112 is located between the electrode leads 111 and 112 and the cell casing 115, and prevents short circuits from occurring between the electrode leads 111 and 112 and the cell casing 115, and improves sealing strength to prevent electrolyte leakage, etc.

[0043] Although the two electrode leads 111 and 112 are shown as being disposed on both sides of the electrode assembly, they may be disposed on only one side of the electrode assembly depending on the arrangement of the electrode tabs.

[0044] The module case 200 is intended to protect the battery cell stack 100 and the electrical equipment connected thereto from external physical impacts, and the module case 200 can accommodate the battery cell stack 100 and the electrical equipment connected thereto in the internal space of the module case 200.

[0045] The module case 200 may have a variety of structures. For example, the module case 200 may have a mono-frame structure. Here, the mono-frame may be a metal plate having an integrated top, bottom, and both side surfaces. The mono-frame may be manufactured by extrusion molding. As another example, the module case 200 may have a structure in which a U-shaped frame and an upper plate (upper surface 201) are coupled together. In the case of a structure in which a U-shaped frame and an upper plate are coupled together, the module case 200 may be formed by coupling the upper plate to the top of a U-shaped frame, which is a metal plate having an integrated or coupled bottom and both side surfaces, and each frame or plate may be manufactured by press molding. Furthermore, the module case 200 may have an L-shaped frame structure in addition to the mono-frame or U-shaped frame structure, and may also have various structures not described in the above examples.

[0046] The module case 200 may be provided with an open structure along the length of the battery cell stack 100. The front and rear faces of the battery cell stack 100 do not have to be blocked by the module case 200. The electrode leads 111, 112 of the battery cells 110 do not have to be blocked by the module case 200. The front and rear faces of the battery cell stack 100 may be blocked by bus bar frames 300, 301, end plates 400, or bus bars 310, 320 (described below), etc., which can protect the front and rear faces of the battery cell stack 100 from external physical impacts, etc.

[0047] A compression pad 150 may be positioned between the battery cell stack 100 and one side of the inner surface of the module case 200 .

[0048] The compression pad 150 may be disposed in the battery cell stack 100 so as to face the outermost battery cell 110 of the battery cell stack 100 in the X-axis direction on the drawing.

[0049] Furthermore, although not shown, a thermally conductive resin may be injected between the battery cell stack 100 and the inner surface of the module case 200, and the injected thermally conductive resin may form a thermally conductive resin layer (not shown) between the battery cell stack 100 and one of the inner surfaces of the module case 200. In this case, the thermally conductive resin layer may be located on the Z-axis of the battery cell stack 100, and the thermally conductive resin layer may be formed between the battery cell stack 100 and a bottom surface of the module case 200 located on the -Z-axis.

[0050] The bus bar frames 300, 301 are positioned on one side of the battery cell stack 100 to cover that side and facilitate connection between the battery cell stack 100 and an external device. Specifically, the bus bar frames 300, 301 may be positioned on the front or rear side of the battery cell stack 100 as shown, or may be positioned on the top, bottom, or side of the battery cell stack 100. At least one of bus bars 310, 320 and module connectors may be attached to the bus bar frames 300, 301. As shown in FIG. 2 , one side of the bus bar frames 300, 301 may be connected to one or the other side of the battery cell stack 100, and the other side of the bus bar frames 300, 301 may be connected to the bus bars 310, 320.

[0051] The bus bar frames 300 and 301 may include one or more bus bar seating bases 340 and one or more ribs 330 to which the bus bars 310 and 320 are coupled and seated (see FIG. 8).

[0052] In the bus bar frames 300 and 301, the bus bars 310 and 320 may be mounted on the front surface of the bus bar mounting bases 340, and a plurality of the bus bar mounting bases 340 may be arranged at intervals in the width direction of the battery module 1000.

[0053] The rib 330 may be configured to connect two adjacent bus bar seats 340 between them. The rib 330 disposed between two adjacent bus bar seats 340 can improve the rigidity of the bus bar frames 300 and 301.

[0054] The bus bar frames 300, 301 may be made of or include an electrically insulating material, and the bus bar frames 300, 301 can limit contact between the bus bars 310, 320 and other parts of the battery cells 110 other than the parts joined to the electrode leads 111, 112, thereby preventing electrical short circuits.

[0055] The bus bar frames 300 and 301 may be located on one side and the other side of the battery cell stack 100, respectively.

[0056] The bus bars 310, 320 may be attached to the bus bar seats 340 on one side of the bus bar frames 300, 301 to electrically connect the battery cell stack 100 or the battery cells 110 to an external device circuit. A plurality of bus bars 310, 320 may be arranged, and by being positioned between the battery cell stack 100 or the bus bar frames 300, 301 and the end plate 400, they can be protected from external impacts and the like, and a decrease in durability due to external moisture and the like can be minimized.

[0057] The bus bars 310 and 320 may be electrically connected to the battery cell stack 100 via the electrode leads 111 and 112 of the battery cells 110 .

[0058] Specifically, the electrode leads 111, 112 of the battery cells 110 may pass through lead slits formed in the bus bar frames 300, 301 and then bent to be connected to the bus bars 310, 320. As shown in Fig. 8, the electrode leads 111, 112 of the battery cells 110 may be connected to both sides of the bus bars 310, 320, and the electrode lead 111 connected to one side of the bus bars 310, 320 may be a positive lead, and the electrode lead 112 connected to the other side of the bus bars 310, 320 may be a negative lead.

[0059] The bus bars 310 and 320 allow the battery cells 110 constituting the battery cell stack 100 to be connected in series or in parallel.

[0060] The bus bars 310, 320 may include a terminal bus bar 320 for electrically connecting one battery module 1000 to another battery module 1000. At least a portion of the terminal bus bar 320 may be exposed to the outside of the end plate 400 for connection to another battery module 1000, and the end plate 400 may include a terminal opening 410 for this purpose. One end (second portion 322 ) of terminal bus bar 320 may be exposed through opening 510 in insulating cover 500 and terminal opening 410 in end plate 400 .

[0061] 4, the terminal bus bar 320 may include a first portion 321 connected to the electrode leads 111, 112 of the battery cell 110 and a second portion 322 exposed to the outside through the terminal opening 410. The terminal bus bar 320 may further include a bending portion 323 formed between the first portion 321 and the second portion 322.

[0062] In the terminal bus bar 320, the first portion 321 may be connected to the second portion 322 via the bending portion 323, and one side of the first portion 321 and one side of the second portion 322 may be perpendicular to each other. That is, the bending portion 323 may be formed in the terminal bus bar 320, and the second portion 322 may protrude and be seated on the seating portion 530 of the insulating cover 500, so that the second portion 322 may be electrically connected to an inter-bus bar (not shown). The second portion 322 constituting one end of the terminal bus bar 320 has a coupling hole 322a formed therein, and the second portion 322 of the terminal bus bar 320 may be fixed by a fixing pin (not shown) inserted into the coupling hole 322a.

[0063] 9 and 10 , in this embodiment, the busbar frame 300 on which the terminal busbar 320 is disposed may have the protrusion 350. The protrusion 350 may protrude from the busbar frame 300 toward the insulating cover 500, and an end of the protrusion 350 may abut against the inner surface of the insulating cover 500. The protrusion 350 may extend outward from the busbar seat 340 or the rib 330, or may extend vertically from the busbar frame 300 along the length of the busbars 310 and 320.

[0064] The end plates 400, 401 may be disposed outside two insulating covers 500, 501 disposed on both sides of the battery cell stack 100. The end plates 400, 401 may serve to protect the battery cell stack 100 and the electrical components connected thereto from external physical impacts by sealing the open side of the module case 200. To this end, the end plates 400, 401 may be manufactured from a material having a predetermined strength, and for example, the end plates 400, 401 may include a metal such as aluminum or a plastic material.

[0065] The end plates 400, 401 may include terminal openings 410. In this embodiment, the terminal openings 410 may be disposed in the end plate 400 disposed outside the insulating cover 500 on which one end of the terminal bus bar 320 is seated. The terminal openings 410 may be disposed on both sides of the end plate 400, and a portion of the insulating cover 500 and one end (second portion 322) of the terminal bus bar 320 may be exposed through the terminal openings 410.

[0066] A connector opening may be located between the terminal openings 410 located on both sides of the end plate 400, and the module connector may be exposed to the outside through the connector opening.

[0067] The end plates 400, 401 may be coupled to the module case 200 while covering the bus bar frames 300, 301 or the bus bars 310, 320 located on one side of the battery cell stack 100. Each corner of the end plate 400 may be coupled to a corresponding corner of the module case 200 by welding, bolting, hook fastening, or other methods.

[0068] The end plates 400, 401 can be located on one side and the other side of the module case 200, respectively, so as to cover both sides of the battery cell stack 100. In this embodiment, an example has been shown in which the end plates 400, 401 are located on the front and rear sides of the module case 200.

[0069] Furthermore, insulating covers 500, 501 for electrical insulation may be arranged between the end plates 400, 401 and the bus bar frames 300, 301. In this embodiment, insulating covers 500, 501 may be arranged on both sides of the battery cell stack 100, and one insulating cover 501 may be arranged between the end plate 401 and the bus bar frame 301, and the other insulating cover 500 may be arranged between the end plate 400 and the bus bar frame 300.

[0070] That is, the bus bar frames 300, 301, the insulating covers 500, 501, and the end plates 400, 401 can be positioned in this order from the outside of the battery cell stack 100. As with the end plates 400, 401, the bus bar frames 300, 301 and the insulating covers 500, 501 may each be made up of multiple bus bar frames 300, 301 and multiple insulating covers 500, 501.

[0071] The insulating covers 500, 501 may be made of or include an electrically insulating material and can block contact between the bus bars 310, 320 and the end plates 400, 401.

[0072] The insulating cover 500, which is disposed on the outside of the bus bar frame 300 on which the terminal bus bar 320 is disposed, may include an opening 510 and a seating portion 530. The openings 510 may be disposed on both sides of the upper portion of the insulating cover 500, and one end (second portion 322) of the terminal bus bar 320 may be exposed through the openings 510.

[0073] A connector opening may be located between the openings 510 located on both sides of the insulating cover 500, and the module connector may be exposed to the outside through the connector opening.

[0074] The insulating covers 500, 501 may be located on the inner surfaces of the end plates 400, 401 and may be in close contact with the inner surfaces of the end plates 400, 401, but are not limited to this.

[0075] As described above, one end (second portion 322) of the terminal bus bar 320 may be exposed through the opening 510, and the exposed one end (second portion 322) of the terminal bus bar 320 may be seated in the seating portion 530. Therefore, the seating portion 530 may be disposed adjacent to the opening 510 or on the outer surface of the upper portion.

[0076] The second portion 322 of the terminal bus bar 320 can be seated on the upper surface of the seating portion 530, and therefore the upper surface of the seating portion 530 can form a seating surface. Also, as shown in FIG. 5, the seating portion 530 may include a fixing member 531 for fixing the terminal bus bar 320.

[0077] The fixing member 531 can fix the second portion 322 of the terminal bus bar 320 and may include a fixing hole 531a.

[0078] A fixing pin (not shown) may be inserted into the fixing hole 531 a. The fixing pin (not shown) is inserted into a coupling hole 322 a formed in the second portion 322 of the terminal bus bar 320 and coupled to the fixing hole 531 a, thereby fixing the second portion 322 of the terminal bus bar 320 to the insulating cover 500.

[0079] Therefore, the second portion 322 of the terminal bus bar 320 is seated on the seating portion 530 of the insulating cover 500, and the second portion 322 is seated and comes into contact with the fixing member 531 disposed on the seating portion 530.

[0080] A terminal cover portion (not shown) that covers one end (second portion 322) of exposed terminal bus bar 320 may be disposed on insulating cover 500.

[0081] Meanwhile, as shown in FIGS. 6 to 8, an insulating cover 501 on the opposite side of the insulating cover 500 on which one end of the terminal bus bar 320 is seated may include a pressure pad 540.

[0082] The pressure pad 540 may be disposed on the inner surface of the insulating cover 501 facing the bus bar frame 301, and can press the bus bar frame 301 toward the battery cell stack 100. The pressure pad 540 can press the battery cell stack 100 via the bus bar frame 301 toward the insulating cover 500 on the opposite side. The pressure pad 540 can compress the bus bar frame 301 while applying pressure.

[0083] A plurality of pressure pads 540 may be arranged spaced apart from one another, and the plurality of pressure pads 540 may be arranged spaced apart in the width direction (X-axis direction) of the insulating cover 501 or the battery module 1000.

[0084] Each pressure pad 540 may extend in the vertical direction, and the vertical length of the pressure pad 540 may be smaller than that of the insulating cover 501. Although the pressure pad 540 has a rectangular cross section in plan view, this is not limiting and the pressure pad 540 may have a cross section of other shapes.

[0085] Such a pressure pad 540 can pressurize the bus bar frame 301 between the bus bars 310 and 320 arranged on the bus bar frame 301, and more specifically, the front end of the pressure pad 540 can contact the rib (330) located between the bus bars 310 and 320 on the bus bar frame 301 to pressurize the rib 330.

[0086] The ribs 330 of the bus bar frames 300, 301 may be positioned between the bus bars 310, 320 and may be recessed toward the battery cell stack 100. The front end of the pressure pad 540 may be positioned between the two bus bars 310, 320, and the pressure pad 540 may contact the ribs 330 between the bus bars 310, 320 to press the ribs 330 toward the battery cell stack 100.

[0087] The pressure pad 540 may be a foam pad, or may be made of a synthetic resin foam, such as urethane foam.

[0088] Although FIG. 7 shows an example in which three pressure pads 540 are arranged on the insulating cover 501, the number of pressure pads may be changed.

[0089] In this way, the pressure pad 540 applies pressure to the battery cell stack 100 via the bus bar frame 301 toward the insulating cover 500 on the opposite side, and the protrusions 350 of the bus bar frame 300 on the opposite side come into contact with the inner surface of the insulating cover 500. This improves the positioning accuracy of the holes (coupling holes 322a) in the terminal bus bars 320.

[0090] As described above, the terminal bus bar 320 can be fixed to the insulating cover 500 by inserting the fixing pin (not shown) into the coupling hole 322a of the terminal bus bar 320 and coupling it to the fixing hole 531a of the insulating cover 500. However, if the coupling hole 322a of the terminal bus bar 320 and the fixing hole 531a of the insulating cover 500 are not aligned and the coupling hole 322a of the terminal bus bar 320 is misaligned from the fixing hole 531a of the insulating cover 500, it becomes difficult to fix the terminal bus bar 320 to the insulating cover 500 with the fixing pin.

[0091] Therefore, the positioning of the holes in the terminal bus bars 320 is important, and in the present invention, when the pressure pad 540 presses the battery cell stack 100 toward the opposite insulating cover 500 and the protrusions 350 of the opposite bus bar frame 300 abut against the inner surface of the insulating cover 500, the coupling holes 322a of the terminal bus bars 320 can be positioned accurately. Therefore, as shown in Fig. 11, the coupling holes 322a of the terminal bus bars 320 can be aligned with the fixing holes 531a of the insulating cover 500, improving the ease of assembly and workability of the battery module 1000.

[0092] Meanwhile, electrical connection between the battery modules 1000 may be performed via an inter-bus bar (not shown). The inter-bus bar is a member for connecting one battery module 1000 to another adjacent battery module 1000 or a BDU (Battery Disconnection Unit), and may be connected to one exposed end (second portion 322) of the terminal bus bar 320. For example, the inter-bus bar may be connected to an upper portion of one end (second portion 322) of the terminal bus bar 320 while overlapping it.

[0093] After one end of the inter-busbar is placed on the second part 322 of the terminal busbar 320, the fixing pin is inserted sequentially into the connecting hole of the inter-busbar and the connecting hole 322a of the second part 322 of the terminal busbar 320, and then the fixing pin is fixed in the fixing groove 531a of the seating part 530, thereby connecting the inter-busbar to the terminal busbar 320.

[0094] Then, the second portions 322 of the terminal bus bars 320 together with the inter-bus bars may be fixed to the insulating cover 500 by fixing pins.

[0095] As described above, one or more battery modules 1000 according to the present invention may form a battery pack 2000. As shown in Fig. 12, a battery pack 2000 according to an embodiment of the present invention may house at least one or more battery modules 1000 inside a pack case 2100, and may include various control and protection systems such as a BMS (Battery Management System) and a cooling system.

[0096] The pack case 2100 may include a lower housing 2110 and an upper housing (not shown) coupled to the upper side of the lower housing 2110, and a plurality of battery modules 1000 can be housed in the internal spaces of the lower housing 2110 and the upper housing.

[0097] Meanwhile, in the embodiment of the present invention, an example in which a plurality of battery modules 1000 are housed inside the battery pack 2000 has been described. However, a plurality of battery cells 110 may be directly disposed inside the battery pack 2000.

[0098] The battery module 1000 and battery pack 2000 according to the present invention configured as described above can be applied to various devices. Specifically, they can be applied to transportation means such as electric bicycles, electric vehicles (V), and hybrid vehicles, as well as ESS (Energy Storage Systems), but are not limited thereto, and can be applied to various devices that can use secondary batteries.

[0099] 13 is a diagram showing an electric vehicle (V) equipped with a battery pack 2000. In the electric vehicle (V), wheels are driven by a motor supplied with power from the battery pack 2000, allowing the electric vehicle to run.

[0100] The present invention has been described above by citing preferred embodiments, but is not limited to the above embodiments, and various changes and modifications can be made by those having ordinary knowledge in the technical field to which the invention pertains, without departing from the spirit of the present invention. [Industrial Applicability]

[0101] The present invention can provide a battery module and pack that constrains the position of the cell block and improves the hole position accuracy of the terminal bus bar.

Claims

1. a battery cell stack in which a plurality of battery cells are stacked; a module case for accommodating the battery cell stack; a bus bar frame disposed on one side of the battery cell stack; and two insulating covers disposed on either side of the battery cell stack; Including, one of the two insulating covers includes a pressure pad; the other of the two insulating covers is disposed on the outside of the bus bar frame, a pressure pad of the one insulating cover presses the battery cell stack toward the other insulating cover disposed outside the bus bar frame.

2. The battery module according to claim 1 , wherein the pressure pad is disposed on an inner surface of the one insulating cover facing the battery cell stack.

3. The battery module according to claim 1 , wherein the pressure pad may be compressed.

4. The battery module according to claim 1 , wherein the pressure pad is a foam pad.

5. The battery module according to claim 1 , wherein a plurality of the pressure pads are disposed inside the single insulating cover.

6. the bus bar frame includes a protrusion, The battery module according to claim 1 , wherein the protrusion abuts against the remaining one of the insulating covers.

7. the bus bar frames are disposed on both sides of the battery cell stack; The battery module according to claim 1 , wherein the two insulating covers are respectively arranged on the outside of the bus bar frame on both sides of the battery cell stack.

8. The battery module according to claim 7 , further comprising a plurality of bus bars disposed on the bus bar frame.

9. The battery module according to claim 8 , wherein an end of the pressure pad is disposed between the bus bars.

10. The battery module according to claim 8 , wherein the bus bar frame further includes ribs disposed between the bus bars.

11. The battery module according to claim 10 , wherein the pressure pad presses the rib.

12. The battery module according to claim 1 , wherein the pressure pad extends vertically inside the one insulating cover.

13. a terminal bus bar disposed on the bus bar frame; and a fixing member having a fixing hole for fixing one end of the terminal bus bar, the fixing member being disposed under the one end of the terminal bus bar from the remaining one insulating cover; The battery module of claim 1 , further comprising:

14. The battery module according to claim 13 , further comprising an end plate disposed outside the remaining one insulating cover and having a terminal opening through which one end of the terminal bus bar is exposed.

15. The battery module according to claim 13 , wherein the terminal bus bar includes a coupling hole disposed at one end thereof.

16. The battery module according to claim 1 , further comprising two end plates respectively disposed outside the two insulating covers.

17. a battery cell stack in which a plurality of battery cells are stacked; a module case for accommodating the battery cell stack; a bus bar frame disposed on one side of the battery cell stack; and an insulating cover disposed on the outside of the bus bar frame; Including, the bus bar frame includes a protrusion that abuts against the insulating cover.

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