Battery module and battery pack and vehicle which includes the same

Abstract

A battery module comprising: a battery cell stack in which the battery cells are stacked; a module housing that accommodates the battery cell stack; and an end plate arranged on the outside of the module housing, wherein the module housing has a curved end section that is bent from a side surface of the module housing, and the end plate has a mounting section to which the curved end section is mounted.

Description

Battery module and battery pack including same

[0001] The present invention relates to a battery module and a battery pack including the same, and more particularly, to a battery module having a module case capable of blocking the inflow of slag and having a wider welding area, and a battery pack including the same.

[0002]

[0003] Secondary batteries, unlike primary batteries that cannot be recharged, 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) that are driven by electrical power sources.

[0004] 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 these unit secondary battery cells, i.e., unit battery cells, is approximately 2.5 V to 4.6 V. Therefore, when a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. Furthermore, depending on the charge / discharge capacity required for the battery pack, multiple battery cells are connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can be set in various ways depending on the required output voltage or charge / discharge capacity.

[0005]

[0006] When configuring a battery pack by connecting multiple battery cells in series or parallel, it is common to first configure a battery module comprising at least one battery cell, preferably multiple battery cells, and then use at least one such battery module and add other components to configure the battery pack. Here, a battery module refers to a component in which multiple battery cells are connected in series or parallel, and a battery pack refers to a component in which multiple battery modules are connected in series or parallel to increase capacity and output, etc.

[0007]

[0008] Some components of a battery module can be joined together by welding. However, when joining the open end of the battery module case to other components, the welding area is not sufficiently large, resulting in a weak bond. Furthermore, slag and other debris produced during the welding process can flow into the interior of the battery module case.

[0009]

[0010] Accordingly, the present invention has been devised to solve the problems of the prior art, and aims to provide a battery module having a wider welding area and capable of blocking the inflow of slag, and a battery pack including the same.

[0011]

[0012] A battery module according to one embodiment of the present invention comprises: a battery cell stack in which a plurality of battery cells are stacked; a module case for accommodating the battery cell stack; and an end plate disposed on the outside of the module case; wherein the module case has a bent end portion bent from a side of the module case, and the end plate has a mounting portion on which the bent end portion is mounted.

[0013]

[0014] Additionally, the above-described bending end portion has a first bend portion bent in a direction perpendicular to the side surface of the module case.

[0015]

[0016] Additionally, the above-described bend end portion has a second bend portion bent from the end of the first bend portion.

[0017]

[0018] Additionally, the second bend portion is bent in a direction perpendicular to the first bend portion.

[0019]

[0020] Additionally, the end plate has a stepped portion recessed in the direction of extension of the side surface of the module case from the mounting portion, the first bent portion faces the mounting portion, and the second bent portion faces the connecting surface between the mounting portion and the stepped portion.

[0021]

[0022] In addition, when the bending end portion is secured to the fixing portion, the contact surface between the fixing portion and the bending end portion is located on the inner side of the outer side of the module case and the outer side of the end plate.

[0023] Additionally, the above-described bending end portion is bent with a slope that continuously changes from the side of the module case.

[0024]

[0025] In addition, the module case has a U-shaped frame having a bottom and both side surfaces that are integrally formed or mutually joined, and an upper plate covering the top of the U-shaped frame, and the U-shaped frame has the bent end portion.

[0026]

[0027] In addition, the end plate further includes an insulating cover disposed inside the end plate, and the insulating cover includes a cover tail facing at least a portion of the bent end portion.

[0028]

[0029] The above cover tail includes a first tail portion facing the second bend portion, and a second tail portion bent from the first tail portion and facing the first bend portion.

[0030]

[0031] In addition, it further includes a bus bar frame arranged on one side of the battery cell stack.

[0032]

[0033] The battery module and pack according to the present invention have the effect of having a wider welding area and blocking the inflow of slag.

[0034]

[0035] Figure 1 is a perspective view of a battery module according to the present invention.

[0036] Figure 2 is an exploded perspective view of a battery module according to the present invention.

[0037] Figure 3 is a perspective view of a battery cell in the present invention.

[0038] Figure 4 is a perspective view of a terminal bus bar in the present invention,

[0039] Figure 5 is a perspective view of the insulating cover and end plate in the present invention.

[0040] Figure 6 is a plan view showing the module case and end plate of the present invention.

[0041] Figure 7 is a perspective view illustrating a U-shaped frame of the present invention.

[0042]

[0043] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Accordingly, in some embodiments, well-known process steps, well-known device structures, and well-known techniques are not specifically described to avoid ambiguity in the interpretation of the present invention. Like reference numerals refer to like elements throughout the specification.

[0044]

[0045]

[0046] *The thickness may be enlarged to clearly represent multiple layers and regions in the drawings. Similar parts are designated by the same drawing reference numerals throughout the specification. When a layer, membrane, region, plate, etc. is said to be "over" another part, this includes not only the case where it is "directly over" that part, but also the case where there are other parts in between. Conversely, when a part is said to be "directly over" another part, it means that there are no other parts in between. Furthermore, when a layer, membrane, region, plate, etc. is said to be "under" another part, this includes not only the case where it is "directly under" that part, but also the case where there are other parts in between. Conversely, when a part is said to be "directly under" another part, it means that there are no other parts in between.

[0047]

[0048] A battery module (1000) according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0049] 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 in the present invention, FIG. 4 is a perspective view of a terminal bus bar in the present invention, FIG. 5 is a perspective view of an insulating cover and an end plate in the present invention, FIG. 6 is a plan view illustrating a module case and an end plate in the present invention, and FIG. 7 is a perspective view illustrating a U-shaped frame in the present invention.

[0050]

[0051] 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 accommodates the battery cell stack (100), a bus bar frame (300) positioned on one side and / or the other side of the battery cell stack (100), an insulating cover (500) positioned on the outside of the bus bar frame (300), and an end plate (400) positioned on the outside of the insulating cover (500).

[0052]

[0053] The above battery cell stack (100) may be formed by stacking a plurality of battery cells (110) along one direction, and the plurality of battery cells (110) may be electrically connected. The direction in which the plurality of battery cells (110) are stacked may be the X-axis direction (or -X-axis direction) in FIG. 2.

[0054] The direction from the front to the rear of the battery cell stack (100), or the opposite direction, may be defined as the longitudinal direction of the battery cell stack (100), and may be the Y-axis direction in the drawing. In addition, the direction from the upper surface to the lower surface of the battery cell stack (100), or the opposite direction, may be defined as the width direction of the battery cell stack (100), and may be the Z-axis direction in the drawing.

[0055]

[0056] The longitudinal direction of the battery cell stack (100) may be substantially the same as the longitudinal direction of the battery cell (110). The electrode leads (111, 112) of the battery cell (110) may be positioned on the front and rear sides of the battery cell stack (100), and the bus bars (310, 320) of the battery module (1000) may be positioned close to the front and rear sides of the battery cell stack (100) to easily form an electrical connection with the electrode leads (111, 112).

[0057]

[0058] The battery cell (110) may be provided as a pouch-shaped battery cell, and the number of pouch-shaped battery cells stacked per unit area may be maximized. However, the battery cell (110) does not necessarily have to be provided as a pouch-shaped battery cell, and may be provided in a square, cylindrical, or other various shapes.

[0059]

[0060] A battery cell (110) provided in a pouch form may include an electrode assembly and a cell case (115) that accommodates the electrode assembly (see FIG. 3).

[0061]

[0062] The cell case (115) of the battery cell (110) may be a pouch-type cell case (115) for accommodating the electrode assembly. The cell case (115) includes a lower case and an upper case covering the lower case, and the upper and lower cases may be formed integrally. In addition, as illustrated in FIG. 3, the connecting portions of the upper and lower cases may be formed in a structure in which they are bent and folded. In addition, as illustrated, the upper case may completely cover the lower case, and a sealing portion (114) may be formed at the periphery.

[0063]

[0064] Both the upper and lower cases can be formed of a laminate structure including an inner covering layer, a metal layer, and an outer covering layer. The inner covering layer is located on the inside of the cell case (115) based on the metal layer and is in direct contact with the electrode assembly, so it must have insulation and electrolytic resistance. In addition, in order to seal it from the outside, the sealing portion where the inner layers are thermally bonded must have excellent thermal bonding strength. The metal layer is located between the inner covering layer and the outer covering layer and serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside. A preferable material for the metal layer in contact with the inner covering layer is an aluminum (Al) thin film that is lightweight and has excellent formability. The outer covering layer is located on the outside of the cell case (115) based on the metal layer, and this outer covering layer can use a heat-resistant polymer with excellent tensile strength, moisture permeability, and air permeability to protect the electrode assembly while ensuring heat resistance and chemical resistance. For example, nylon or polyethylene terephthalate can be used.

[0065]

[0066] A receiving groove (116) can be formed in each of the upper and lower cases, and an electrode assembly can be accommodated in the receiving groove (116) of the upper and lower cases.

[0067]

[0068] The electrode assembly housed in the cell case (115) may be one of a group consisting of a jelly-roll type electrode assembly having a structure in which a separator is interposed between long sheet-shaped positive and negative electrodes and then rolled up, a stack type electrode assembly having unit cells having a structure in which rectangular positive and negative electrodes are stacked with a separator interposed between them, a stack-folding type electrode assembly in which the unit cells are rolled up by a long separator film, and a lamination-stack type electrode assembly in which the unit cells are stacked with a separator interposed between them and attached to each other.

[0069]

[0070] Additionally, the electrode assembly may include two electrode tabs and two electrode leads (111, 112) each connected to the electrode tabs by a weld.

[0071] One of the two electrode leads (111, 112) may be a positive lead connected to the positive tab, and the other electrode lead (111, 112) may be a negative lead connected to the negative tab.

[0072]

[0073] A lead film (113) may be attached to each of the electrode leads (111, 112). The lead film (113) coupled to the electrode leads (111, 112) is positioned between the electrode leads (111, 112) and the cell case (115), thereby preventing a short circuit from occurring between the electrode leads (111, 112) and the cell case (115) and improving the sealing force, thereby preventing leakage of the electrolyte, etc.

[0074]

[0075] The two electrode leads (111, 112) are shown as being arranged on each side of the electrode assembly, but may be arranged on only one side of the electrode assembly depending on the arrangement of the electrode tabs.

[0076] The above module case (200) may be for protecting the battery cell stack (100) and electrical components connected thereto from external physical impact, and the module case (200) may accommodate the battery cell stack (100) and electrical components connected thereto in the internal space of the module case (200).

[0077]

[0078] The structure of the module case (200) may vary. In one embodiment of the present invention, the module case (200) may have a U-shaped frame (210) having a bottom and both sides that are integrally formed or mutually coupled, and an upper plate (220) covering the upper part of the U-shaped frame (210). The U-shaped frame (210) and the upper plate (220) may be metal plates, and each may be manufactured by press forming.

[0079] However, the structure of the module case (200) is not particularly limited. For example, the structure of the module case (200) may be a monoframe structure. Here, the monoframe may be in the form of a metal plate in which the upper surface, lower surface, and both sides are integrated. The monoframe may be manufactured by extrusion molding. As another example, the structure of the module case (200) may be provided as an L-shaped frame structure in addition to a monoframe or a U-shaped frame, and may also be provided as various structures not described in the above-described examples.

[0080]

[0081] The structure of the module case (200) may be provided in an open form along the longitudinal direction of the battery cell stack (100). The front and rear sides of the battery cell stack (100) may not be covered by the module case (200). The electrode leads (111, 112) of the battery cells (110) may not be covered by the module case (200). The front and rear sides of the battery cell stack (100) may be covered by a bus bar frame (300), an end plate (400), or bus bars (310, 320) to be described later, and through this, the front and rear sides of the battery cell stack (100) may be protected from external physical impacts, etc.

[0082]

[0083] A compression pad (150) may be positioned between one side of the inner surface of the battery cell stack (100) and the module case (200).

[0084] The compression pad (150) can be arranged to face the battery cell (110) at the outermost end of the battery cell stack (100) in the X-axis direction in the drawing.

[0085] Also, although not shown, a thermally conductive resin may be injected between the inner surface of the battery cell stack (100) and the module case (200), and a thermally conductive resin layer (not shown) may be formed between one of the inner surfaces of the battery cell stack (100) and the module case (200) by the injected thermally conductive resin. At this time, the thermally conductive resin layer may be positioned 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 the bottom surface positioned on the -Z-axis of the module case (200).

[0086]

[0087] The above busbar frame (300) is positioned on one side of the battery cell stack (100), and can cover one side of the battery cell stack (100) and simultaneously guide the connection between the battery cell stack (100) and an external device. Specifically, the busbar frame (300) can be positioned on the front or rear side of the battery cell stack (100) as illustrated, and can also be positioned on the upper side, lower side, or side. At least one of a busbar (310, 320) and a module connector can be mounted on the busbar frame (300). As illustrated in FIG. 2, one side of the busbar frame (300) can be connected to one side or the other side of the battery cell stack (100), and the other side of the busbar frame (300) can be connected to the busbar (310, 320).

[0088]

[0089] The busbar frame (300) may include one or more busbar mounting brackets and one or more ribs on which busbars (310, 320) are combined and mounted.

[0090] A busbar (310, 320) can be mounted on the front of the busbar mounting bracket of the busbar frame (300), and a plurality of busbar mounting brackets can be arranged spaced apart in the width direction of the battery module (1000).

[0091]

[0092] The ribs may be configured to connect two busbar mounting brackets between adjacent busbar mounting brackets. The ribs may be arranged between two adjacent busbar mounting brackets to improve the rigidity of the busbar frame (300).

[0093]

[0094] The busbar frame (300) may include an electrically insulating material. The busbar frame (300) may limit contact between the busbars (310, 320) and other parts of the battery cells (110) other than the parts where the busbars are connected to the electrode leads (111, 112), thereby preventing electrical short circuits from occurring.

[0095] The busbar frame (300) may be positioned on one side and the other side of the battery cell stack (100).

[0096]

[0097] The busbar (310, 320) may be mounted on a busbar mounting plate on one side of the busbar frame (300) and may be used to electrically connect the battery cell stack (100) or battery cells (110) and an external device circuit. A plurality of busbars (310, 320) may be arranged, and may be positioned between the battery cell stack (100) or busbar frame (300) and the end plate (400), thereby protecting the battery from external impacts, etc., and minimizing the deterioration of durability due to external moisture, etc.

[0098] The busbar (310, 320) can be electrically connected to the battery cell stack (100) through the electrode leads (111, 112) of the battery cell (110).

[0099]

[0100] Specifically, the electrode leads (111, 112) of the battery cell (110) can be bent after passing through the lead slit formed in the bus bar frame (300) and connected to the bus bar (310, 320). The electrode leads (111, 112) of the battery cell (110) can be connected to both sides of the bus bar (310, 320), and the electrode lead (111) connected to one side of the bus bar (310, 320) can be a positive electrode lead, and the electrode lead (112) connected to the other side of the bus bar (310, 320) can be a negative electrode lead.

[0101] Battery cells (110) constituting the battery cell stack (100) can be connected in series or parallel by bus bars (310, 320).

[0102]

[0103] The busbars (310, 320) may include terminal busbars (320) for electrically connecting one battery module (100) to another battery module (100). At least a portion of the terminal busbars (320) may be exposed to the outside of the end plate (400) to be connected to another battery module (100), and the end plate (400) may be provided with terminal openings (410) for this purpose.

[0104]

[0105] The terminal bus bar (320) can have one end (second part (322)) exposed through the opening (510) of the insulating cover (500) and the terminal opening (410) of the end plate (400).

[0106] As illustrated in FIG. 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 a terminal opening (410). In addition, the terminal bus bar (320) may further include a bending portion (323) formed between the first portion (321) and the second portion (322).

[0107]

[0108] In the terminal bus bar (320), the first part (321) can be connected to the second part (322) through the bending part (323), and one side of the first part (321) and one side of the second part (322) can be perpendicular to each other. That is, by forming a bent bending part (323) in the terminal bus bar (320), the second part (322) can protrude and be seated in the seating part (530) of the insulating cover (500), and the second part (322) can be electrically connected to the inter bus bar (not shown). A joining hole (322a) is formed in the second part (322) constituting one end of the terminal bus bar (320), and the second part (322) of the terminal bus bar (320) can be fixed by a fixing pin (not shown) inserted into the joining hole (322a).

[0109]

[0110] The end plate (400) may be used to seal the open surface of the module case (200) to protect the battery cell stack (100) and electrical components connected thereto from external physical impact. To this end, the end plate (400) may be manufactured from a material having a predetermined strength, and for example, the end plate (400) may include a metal such as aluminum or a plastic material.

[0111]

[0112] A terminal opening (410) may be formed in the end plate (400). The terminal openings (410) may be positioned on each side 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).

[0113]

[0114] In addition, a connector opening may be located between terminal openings (410) located on both sides of the end plate (400), and a module connector may be exposed to the outside through the connector opening.

[0115] The end plate (400) can be combined with the module case (200) while covering the busbar frame (300) or busbar (310, 320) located on one side of the battery cell stack (100). Each corner of the end plate (400) can be combined with a corresponding corner of the module case (200) by welding, bolting, hooking, or the like.

[0116]

[0117] The end plate (400) may be positioned on the outside of the module case (200). Specifically, the end plate (400) may be positioned on one side and the other side of the module case (200) so as to cover both sides of the battery cell stack (100). In the present embodiment, an example is shown in which the bus bar frame (300) is positioned on one side of the battery cell stack (100), and the end plate (400) is positioned on the front and rear sides of the module case (200).

[0118]

[0119] The insulating cover (500) may be positioned on the inside of the end plate (400) and on the outside of the busbar frame (300). In addition, an insulating cover (500) for electrical insulation may be positioned between the end plate (400) and the busbar frame (300). That is, the busbar frame (300), the insulating cover (500), and the end plate (400) may be sequentially positioned from the battery cell stack (100) to the outside. Like the end plate (400), the busbar frame (300) and the insulating cover (500) may each be configured in multiples.

[0120]

[0121] The insulating cover (500) may include an electrically insulating material and may block the busbar (310, 320) from contacting the end plate (400).

[0122] The insulating cover (500) may include an opening (510) and a mounting portion (530). The openings (510) may be positioned on each of the upper sides of the insulating cover (500), and one end (second portion (322)) of the terminal bus bar (320) may be exposed through the openings (510).

[0123]

[0124] In addition, 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.

[0125]

[0126] The insulating cover (500) may be positioned on the inner surface of the end plate (400) and may be in close contact with the inner surface of the end plate (400), but this is not necessarily the case.

[0127] As described above, one end (the second part (322)) of the terminal bus bar (320) can be exposed through the opening (510), and the exposed one end (the second part (322)) of the terminal bus bar (320) can be seated on the mounting portion (530). Accordingly, the mounting portion (530) can be positioned adjacent to the opening (510) and can be positioned on the upper outer surface.

[0128]

[0129] The mounting portion (530) may have a second portion (322) of the terminal bus bar (320) mounted on its upper surface, and thus the upper surface of the mounting portion (530) may form a mounting surface. In addition, as illustrated in FIG. 5, the mounting portion (530) may include a fixing member (531) for fixing the terminal bus bar (320).

[0130]

[0131] The fixing member (531) can fix the second part (322) of the terminal bus bar (320) and may include a fixing hole (531a).

[0132] A fixing pin (not shown) can be inserted into the fixing hole (531a) above. A fixing pin (not shown) inserted into a joining hole (322a) formed in a second part (322) of the terminal bus bar (320) is fixed by being coupled to the fixing hole (531a), thereby fixing the second part (322) of the terminal bus bar (320) to the insulating cover (500).

[0133] Accordingly, the second part (322) of the terminal bus bar (320) is seated on the mounting portion (530) of the insulating cover (500), and the second part (322) is seated on the fixing member (531) arranged on the mounting portion (530) and comes into contact with it.

[0134]

[0135] In addition, a terminal cover portion (not shown) covering one end (second portion (322)) of the exposed terminal bus bar (320) can be placed on the insulating cover (500).

[0136]

[0137] Referring to FIGS. 6 and 7, the module case (200) has a bent end portion (211) bent from the side surface (S1) of the module case (200), and the end plate (400) has a mounting portion (401) on which the bent end portion (211) is mounted. The side surface (S1) of the conventional module case (200) has a shape that extends straight along the longitudinal direction to the end, and thus does not provide a sufficient welding area for welding the end portion of the side surface (S1) of the module case (200) and the end plate (400) to each other. However, the present invention has an enlarged welding area by having the bent end portion (211) of the module case (200) and the mounting portion (41) of the end plate (400). The U-shaped frame (210) of the module case (200) may have a bent end portion (211).

[0138]

[0139] The bending end portion (211) may have a first bend portion (211a) that is bent in a direction perpendicular to the side surface of the module case (200). The first bend portion (211a) may be bent vertically toward the inside of the module case (200). The first bend portion (211a) not only provides an enlarged welding area, but also absorbs external force applied to the end plate (400) toward the module case (200).

[0140]

[0141] In addition, the bending end portion (211) may have a second bending portion (211b) bent from the end of the first bending portion (211a). The second bending portion (211b) may be bent in a direction perpendicular to the first bending portion (211a). The second bending portion (211b) may prevent the end plate (400) from moving in the width direction (X-axis direction) of the battery module (1000). In addition, the second bending portion (211b) may prevent welding sludge from flowing into the inside of the module case (200) through the mounting portion (401) when welding the end plate (400) to the module case (200).

[0142]

[0143] The end plate (400) has a stepped portion (402) that extends from the mounting portion (401) in the direction of extension (the longitudinal direction) of the side surface of the module case (200), and the first bent portion (211a) can be brought into contact with the mounting portion (401), and the second bent portion (211b) can be brought into contact with the connecting surface (403) between the mounting portion (401) and the stepped portion (402). Since the connecting surface (403) and the second bent portion (211b) are brought into contact with each other, the inflow of welding sludge between the end portion of the module case (200) and the end plate (400) can be more closely blocked.

[0144]

[0145] The insertion distance of the step portion (402) may be longer than the length of the second bend portion (211b). This is to prevent a gap from occurring between the module case (200) and the end plate (400) when the second bend portion (211b) contacts the step portion (402).

[0146]

[0147] In a state where the bending end portion (211) is secured to the fixing portion (401), the contact surface between the fixing portion (401) and the bending end portion (211) may be located on the inner side of the outer side of the module case (200) and the outer side of the end plate (400). Here, the inner side refers to the direction from both sides of the module case (200) and the end plate (400) toward the center plane (the +-x-axis direction). That is, an empty space (W) may be provided between the 'contact surface between the fixing portion (401) and the bending end portion (211)' and the 'outer side of the module case (200) and the outer side of the end plate (400).' A welding connection between the module case (200) and the end plate (400) can be made by welding the contact surface between the mounting portion (401) and the bending end portion (211), and at this time, as the welding metal fills the empty space (W), the bonding strength of the welding connection becomes higher.

[0148]

[0149] Referring to Fig. 7, the bending end portion (211) can be bent with a slope that continuously changes from the side of the module case (200). That is, the bending end portion (211) can be bent in a smooth curved shape without having a sharp corner. Since the bending end portion (211) has a curved shape, the aforementioned empty space (W) is naturally provided between the end plate (400) and the bending end portion, and the difficulty of forming the bending end portion is reduced.

[0150]

[0151] Referring again to FIG. 6, the insulating cover (500) may include a cover tail (550) facing at least a portion of the bent end portion (211). The cover tail (550) serves to more closely prevent welding sludge from flowing into the inside of the insulating cover (500) and to prevent relative movement between the module case (200) and the end plate (400). The cover tail (550) may include a first tail portion (551) facing the second bent portion (211b), and a second tail portion (552) bent from the first tail portion (551) and facing the first bent portion (211a).

[0152]

[0153] One or more battery modules (1000) according to the present invention as described above can form a battery pack. The battery pack according to the present invention can accommodate at least one battery module (1000) inside a pack case and can include various control and protection systems such as a BMS (Battery Management System) and a cooling system.

[0154] The battery module (1000) and battery pack according to the present invention, configured as described above, can be applied to various devices. Specifically, they can be applied to transportation vehicles such as electric bicycles, electric vehicles, and hybrid vehicles, or ESS (Energy Storage Systems), but are not limited thereto and can be applied to various devices capable of using secondary batteries.

[0155] Although the present invention has been described with reference to preferred embodiments as described above, it is not limited to the above embodiments, and various changes and modifications may be made by a person having ordinary skill in the art to which the invention pertains within a scope that does not depart from the spirit of the present invention.

[0156]

[0157] The present invention relates to a battery module and a battery pack including the same, and can be used to provide a module case having a wider welding area and capable of blocking the inflow of slag.

Claims

1. A battery cell stack in which multiple battery cells are stacked; A module case for accommodating the above battery cell stack; and An end plate disposed on the outside of the above module case; Including, The above module case has a bent end portion bent from the side of the above module case, A battery module, wherein the end plate has a mounting portion on which the bent end portion is mounted.

2. In paragraph 1, A battery module, wherein the above-mentioned folded end portion has a first folded portion bent in a direction perpendicular to a side surface of the module case.

3. In paragraph 2, A battery module, wherein the above-mentioned bent end has a second bent end bent from an end of the first bent end.

4. In paragraph 3, A battery module, wherein the second bend portion is bent in a direction perpendicular to the first bend portion.

5. In paragraph 4, The above end plate has a stepped portion extended from the mounting portion to the side of the module case, The above first bending part is interviewed at the above fixing part, A battery module, wherein the second bending portion is placed on a connecting surface between the mounting portion and the step portion.

6. In paragraph 1, A battery module, wherein the contact surface between the mounting portion and the bending end portion is located on the outer side of the module case and the inner side of the outer side of the end plate while the bending end portion is mounted on the mounting portion.

7. In paragraph 6, A battery module, wherein the above-mentioned bending end portion is bent at a slope that continuously changes from a side of the module case.

8. In paragraph 1, The above module case comprises a U-shaped frame having a bottom and two side surfaces formed integrally or joined together, and an upper plate covering the upper portion of the U-shaped frame. A battery module, wherein the U-shaped frame has the bent end.

9. In paragraph 4, Further comprising an insulating cover disposed inside the end plate; A battery module, wherein the insulating cover includes a cover tail facing at least a portion of the folded end portion.

10. In paragraph 9, The above cover tail A first tail portion facing the second bend portion, and A battery module including a second tail portion bent from the first tail portion and facing the first bent portion.

11. In paragraph 1, A battery module further comprising a busbar frame arranged on one side of the battery cell stack.

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