Battery module with improved cooling performance and battery pack containing the 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, and a first thermally conductive resin layer disposed inside the module case on an upper side of the battery cell stack.

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 with improved cooling performance and a battery pack including the same.

Background Art

[0002] A secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is applied not only to portable devices but also to electric vehicles (EVs, Electric Vehicles), hybrid electric vehicles (HEVs, Hybrid Electric Vehicles), etc. driven by an electric drive source.

[0003] Currently widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, etc. The operating voltage of such a unit secondary battery cell, that is, a unit battery cell, is about 2. V to 4.6 V. Therefore, when a higher output voltage is required, a large number of battery cells are connected in series to form a battery pack. Also, depending on the charge and discharge capacity required for the battery pack, a large number of battery cells may be connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can be set variously depending on the required output voltage or charge and discharge capacity.

[0004] When configuring a battery pack by connecting a large number of battery cells in series / parallel, it is common to first configure at least one battery cell, preferably a battery module composed of a large number of battery cells, use at least one such battery module, and add other components to configure the battery pack. Here, a battery module means a component in which a large number of battery cells are connected in series or parallel, and a battery pack means a component in which a large number of battery modules are connected in series or parallel to increase the capacity and output, etc.

[0005] The battery modules that make up such secondary batteries generate heat during charging or discharging, and therefore require cooling. [Overview of the project] [Problems that the invention aims to solve]

[0006] The present invention aims to provide a battery module with improved cooling performance and a battery pack containing the same. [Means for solving the problem]

[0007] A battery module according to one embodiment of the present invention is characterized by comprising a battery cell stack in which a plurality of battery cells are stacked, a module case for housing the battery cell stack, and a first thermally conductive resin layer disposed on the upper side of the battery cell stack inside the module case.

[0008] Furthermore, the module case includes a lower plate and an upper plate positioned above and separated from the lower plate.

[0009] Furthermore, a battery module according to one embodiment of the present invention further includes two block pads positioned below the upper plate and spaced apart from each other.

[0010] Furthermore, the first thermally conductive resin is located between the two block pads.

[0011] Furthermore, the upper plate includes one or more injection holes for injecting a thermally conductive resin.

[0012] Furthermore, the block pad is compressible.

[0013] Furthermore, the aforementioned block pad is a foam pad.

[0014] Furthermore, both ends of the block pad are positioned on both side edges of the upper plate.

[0015] The system further includes a film disposed between the upper plate and the block pad.

[0016] Furthermore, one or more welded sections and one or more non-welded sections are arranged along the length of the edge of the upper plate.

[0017] Furthermore, the ends of the block pads are positioned in the non-welded sections of the upper plate.

[0018] Furthermore, the non-welded sections are located between the welded sections.

[0019] Furthermore, one or more welded sections and one or more non-welded sections are arranged along the length of each side edge of the upper plate, and both ends of the block pad are positioned in the non-welded sections of the upper plate.

[0020] Furthermore, the module case includes an upper plate assembly, the upper plate assembly including an upper plate positioned above the battery cell stack and two block pads positioned below the upper plate and spaced apart from each other.

[0021] The module case further includes a second thermally conductive resin layer positioned below the battery cell stack inside the module case.

[0022] Furthermore, the module case includes a lower plate and an upper plate positioned above and separated from the lower plate, and the second thermally conductive resin layer is positioned on the lower plate.

[0023] The system further includes a busbar frame disposed on one side of the battery cell stack and an insulating cover disposed on the outside of the busbar frame. [Effects of the Invention]

[0024] According to the present invention, there are provided a battery module with improved cooling performance and a battery pack including the same.

Brief Description of the Drawings

[0025] [Figure 1] It is a perspective view of a battery module according to an embodiment of the present invention. [Figure 2] It is an exploded perspective view of a battery module according to an embodiment of the present invention. [Figure 3] It is a perspective view of a battery cell of an embodiment of the present invention. [Figure 4] It is a perspective view of a terminal bus bar of an embodiment of the present invention. [Figure 5] It is a perspective view of an insulating cover and an end plate of an embodiment of the present invention. [Figure 6] It is a view showing a U-shaped frame and a battery cell laminate of an embodiment of the present invention. [Figure 7] It is a view showing a state in which the upper plate is separated from a battery module according to an embodiment of the present invention. [Figure 8] [[ID=​​​​​​​​​​​​​​​​​​​​​​​​​The advantages and features of the present invention, as well as methods for achieving them, will become apparent with reference to the embodiments described in detail below, based on the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but is embodied in a variety of different forms. These embodiments are provided only to complete the disclosure of the present invention and to fully inform those ordinary skill in the art to which the invention pertains of the invention, and the present invention is defined solely by the claims. Accordingly, in some embodiments, well-known process steps, well-known element structures and well-known techniques are not specifically described in order to avoid ambiguity of the present invention. Throughout the specification, the same reference numerals indicate the same components.

[0027] In drawings, thickness may be enlarged to clearly represent many layers and regions. The same drawing reference numerals are used for similar parts throughout the specification. When a layer, film, region, plate, etc. is said to be "on top" of another part, this includes not only when it is "directly above" the other part, but also when there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in between. Similarly, when a layer, film, region, plate, etc. is said to be "below" another part, this includes not only when it is "directly below" the other part, but also when there is another part in between. Conversely, when a part is said to be "directly below" another part, it means that there is no other part in between.

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

[0029] Figure 1 is a perspective view of the battery module according to the present invention, Figure 2 is an exploded perspective view of the battery module according to the present invention, Figure 3 is a perspective view of the battery cell according to the present invention, Figure 4 is a perspective view of the terminal busbar according to the present invention, Figure 5 is a perspective view of the insulating cover and end plate according to the present invention, Figure 6 is a diagram showing a U-shaped frame and battery cell stack according to one embodiment of the present invention, Figure 7 is a diagram showing the state in which the top plate has been separated from the battery module according to one embodiment of the present invention, Figure 8 is a bottom view of the top plate assembly according to one embodiment of the present invention, Figure 9 is a detailed view of the top plate assembly shown in Figure 8, Figure 10 is a diagram showing the injection of thermally conductive resin into the battery module according to one embodiment of the present invention, Figure 11 is a longitudinal cross-sectional view of the battery module according to one embodiment of the present invention, Figure 12 is a side view of the battery module according to one embodiment of the present invention, Figure 13 is a diagram showing a battery pack according to one embodiment of the present invention, and Figure 14 is a perspective view of an automobile equipped with a battery pack 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, a busbar frame 300 located on one and / or the other surface of the battery cell stack 100, an insulating cover 500 disposed on the outside of the busbar frame 300, and an end plate 400 disposed on the outside of the insulating cover 500.

[0031] The battery cell stack 100 is 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 Figure 2.

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

[0033] The longitudinal direction of the battery cell stack 100 may be substantially the same as the longitudinal direction of the battery cells 110. The electrode leads 111 and 112 of the battery cells 110 may be located on the front and rear surfaces of the battery cell stack 100, and the busbars 310 and 320 of the battery module 1000 may be positioned close to the front and rear surfaces of the battery cell stack 100 to facilitate electrical connections with the electrode leads 111 and 112.

[0034] The battery cell 110 may be provided as a pouch-type battery cell, which maximizes the number of layers per unit area. However, the battery cell 110 does not necessarily have to be provided as a pouch type, and can also be provided in prismatic, cylindrical, or other various forms.

[0035] The battery cell 110, provided in a pouch, may include an electrode assembly and a cell case 115 that houses the electrode assembly (see Figure 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 that covers the lower case, and the upper case and lower case may be integrated. Also, as shown in Figure 3, the connecting portion of the upper case and lower case may be folded and foldable. Furthermore, as shown in the figure, 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 be laminate structures including an internal coating layer, a metal layer, and an external coating layer. The internal coating layer is located inside the cell case 115 relative to the metal layer and is in direct contact with the electrode assembly, so it must have insulating and electrolytic resistance properties. Furthermore, for sealing to the outside, it is required to have sealing properties, that is, the sealing portions where the internal layers are heat-bonded together must have excellent thermal bonding strength. The metal layer is located between the internal coating layer and the external coating layer and acts as a barrier layer to prevent moisture and various gases from penetrating into the inside of the battery from the outside. A preferred material for the metal layer in contact with the internal coating layer is a thin film of aluminum (Al) which is lightweight but has excellent moldability. The external coating layer is located outside the cell case 115 relative to the metal layer, and such an external coating layer can be made of a heat-resistant polymer with excellent tensile strength, moisture permeability prevention, and air permeability prevention properties so as to ensure heat resistance and chemical resistance while protecting the electrode assembly. For example, nylon or polyethylene terephthalate can be used.

[0038] The upper case and the lower case may each have a housing groove 116, and the electrode assembly may be housed in the housing groove 116 of the upper case and the lower case.

[0039] The electrode assembly housed in the cell case 115 may be one selected from the group consisting of a jelly roll type electrode assembly in which a separation membrane is interposed between a long sheet-like positive electrode and a negative electrode before it is wound up; a stack type electrode assembly consisting of unit cells in which rectangular positive and negative electrodes are stacked with a separation membrane in between; a stack folding type electrode assembly in which the unit cells are wound up by a long separation film; and a lamination stack type electrode assembly in which the unit cells are stacked with a separation membrane in between and adhere to each other.

[0040] The electrode assembly may also include two electrode tabs and two electrode leads 111 and 112 connected to these electrode tabs via welded joints.

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

[0042] A lead film 113 may be attached to each of the electrode leads 111 and 112. The lead film 113 attached to the electrode leads 111 and 112 is located between the electrode leads 111 and 112 and the cell case 115, preventing short circuits from occurring between the electrode leads 111 and 112 and the cell case 115, improving sealing and preventing leakage of the electrolyte.

[0043] Although the two electrode leads 111 and 112 are shown positioned on both sides of the electrode assembly, they may be positioned 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 components connected thereto from external physical shocks, and the module case 200 can house the battery cell stack 100 and the electrical components connected thereto in its internal space.

[0045] The structure of the module case 200 is diverse, and as an example, the module case 200 may have a monoframe structure. Here, the monoframe may be in the form of a metal plate material in which the top surface, bottom surface and both sides are integrated. The monoframe can be manufactured by extrusion molding. As another example, the structure of the module case 200 may be a structure in which a U-shaped frame 210 and a top plate 201 are joined. In the case of a structure in which a U-shaped frame 210 and a top plate 210 are joined, the structure of the module case 200 can be formed by joining a bottom plate 202 and both sides 203, or by joining the top plate 201 to the upper side of a U-shaped frame 210 (see Figure 6) made of an integrated metal plate material, and each frame or plate can be manufactured by press molding. Furthermore, in addition to the monoframe or U-shaped frame 210, the structure of the module case 200 can also be provided as an L-shaped frame structure, and can be provided as a variety of structures not described in the examples above.

[0046] The structure of the module case 200 can be provided in an open form along the length of the battery cell stack 100. The front and rear surfaces of the battery cell stack 100 do not need to be shielded by the module case 200. The electrode leads 111 and 112 of the battery cells 110 do not need to be shielded by the module case 200. The front and rear surfaces of the battery cell stack 100 can be shielded by a busbar frame 300, end plate 400, or busbars 310, 320, etc., which will be described later, thereby protecting the front and rear surfaces of the battery cell stack 100 from external physical impacts, etc.

[0047] A compression pad 150 may be placed 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 positioned 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 as shown in the drawing.

[0049] Furthermore, a thermally conductive resin may be injected between the battery cell stack 100 and the inner surface of the module case 200, and thermally conductive resin layers 610 and 620 may be formed between the battery cell stack 100 and one of the inner surfaces of the module case 200 by the injected thermally conductive resin. Here, the thermally conductive resin layers 610 and 620 can be located on the Z-axis of the battery cell stack 100, or they may be formed between the battery cell stack 100 and a lower plate 202 located on the -Z-axis of the module case 200. The thermally conductive resin layers 610 and 620 will be described later.

[0050] The busbar frame 300 is positioned on one surface of the battery cell stack 100, covering one surface of the battery cell stack 100 and guiding the connection between the battery cell stack 100 and external equipment. Specifically, as shown in the figure, the busbar frame 300 may be positioned on the front or rear surface of the battery cell stack 100, or on the top, bottom, or side surface. At least one of the busbars 310, 320, and module connectors may be mounted on the busbar frame 300. As shown in Figure 3, one surface of the busbar frame 300 may be connected to one or the other surface of the battery cell stack 100, and the other surface of the busbar frame 300 may be connected to the busbars 310, 320.

[0051] The busbar frame 300 may include an electrically insulating material. The busbar frame 300 can restrict the busbars 310 and 320 from contacting other parts of the battery cell 110 other than the parts joined to the electrode leads 111 and 112, thereby preventing electrical short circuits.

[0052] The busbar frame 300 may be located on one side and the other side of the battery cell stack 100, respectively.

[0053] Busbars 310 and 320 are mounted on one surface of the busbar frame 300 and may be used to electrically connect the battery cell stack 100 or the battery cells 110 to external equipment circuits. Multiple busbars 310 and 320 may be arranged and positioned between the battery cell stack 100 or the busbar frame 300 and the end plate 400 to protect them from external impacts and minimize deterioration of durability due to external moisture.

[0054] The busbars 310 and 320 may be electrically connected to the battery cell stack 100 via the electrode leads 111 and 112 of the battery cell 110.

[0055] Specifically, the electrode leads 111 and 112 of the battery cell 110 may pass through lead slits formed in the busbar frame 300, then bend and connect to the busbars 310 and 320. The busbars 310 and 320 allow the battery cells 110 constituting the battery cell stack 100 to be connected in series or in parallel.

[0056] The busbars 310 and 320 may include a terminal busbar 320 for electrically connecting one battery module 100 to another battery module 100. To connect to another battery module 100, at least a portion of the terminal busbar 320 is exposed to the outside of the end plate 400, which may have a terminal opening 410 for this purpose.

[0057] The terminal busbar 320 may have one end (second portion 322) exposed through the opening 510 of the insulating cover 500 and the terminal opening 410 of the end plate 400.

[0058] As shown in Figure 4, the terminal busbar 320 may include a first portion 321 connected to the electrode leads 111 and 112 of the battery cell 110, and a second portion 322 exposed to the outside through the terminal opening 410. The terminal busbar 320 may further include a bending portion 323 formed between the first portion 321 and the second portion 322.

[0059] In the terminal bus bar 320, the first portion 321 is connected to the second portion 322 via a bending portion 323, and one surface of the first portion 321 and one surface of the second portion 322 may be perpendicular to each other. That is, by forming a bent bending portion 323 in the terminal bus bar 320, the second portion 322 may protrude and seat on the seating portion 530 of the insulating cover 500, and the second portion 322 may be electrically connected to an interbus bar (not shown). A coupling hole 322a is formed in the second portion 322 that constitutes one end of the terminal bus bar 320, and the second portion 322 of the terminal bus bar 320 is fixed by a fixing pin (not shown) inserted into this coupling hole 322a.

[0060] The end plate 400 may also be intended to protect the battery cell stack 100 and the electrical components connected thereto from external physical shocks by sealing the open surface of the module case 200. For this purpose, the end plate 400 can 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.

[0061] Terminal openings 410 may be formed in the end plate 400. The terminal openings 410 are located 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.

[0062] Furthermore, a connector opening may be located between the terminal openings 410 on both sides of the end plate 400, and the module connector may be exposed to the outside through the connector opening.

[0063] The end plate 400 may be coupled to the module case 200 while covering the busbar frame 300 or busbars 310, 320 located on one surface of the battery cell stack 100. Each corner of the end plate 400 can be coupled to the corresponding corner of the module case 200 by methods such as welding, bolting, or hooking.

[0064] The end plates 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 this embodiment, an example is shown in which the end plates 400 are positioned on the front and rear sides of the module case 200.

[0065] Furthermore, 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, insulating cover 500, and end plate 400 may be positioned sequentially outward from the battery cell stack 100. Similar to the end plate 400, the busbar frame 300 and insulating cover 500 may each be composed of multiple units.

[0066] The insulating cover 500 may include an electrically insulating material and can prevent the busbars 310 and 320 from coming into contact with the end plate 400.

[0067] The insulating cover 500 may include openings 510 and seating portions 530. The openings 510 are located on both sides of the upper part of the insulating cover 500, and one end (second portion 322) of the terminal bus bar 320 may be exposed through the openings 510.

[0068] Furthermore, a connector opening may be located between the openings 510 on both sides of the insulating cover 500, through which the module connector may be exposed to the outside.

[0069] The insulating cover 500 is located on the inner surface of the end plate 400 and can be in close contact with the inner surface of the end plate 400, but is not necessarily limited to this.

[0070] As described above, one end (second portion 322) of the terminal bus bar 320 may be exposed through the opening 510, and this exposed end (second portion 322) of the terminal bus bar 320 may be seated on the seating portion 530. Therefore, the seating portion 530 may be positioned adjacent to the opening 510 and on the upper outer surface.

[0071] The seating portion 530 can accommodate the second portion 322 of the terminal bus bar 320 on its upper surface, thereby forming a seating surface on the upper surface of the seating portion 530. Furthermore, as shown in Figure 5, the seating portion 530 may include a fixing portion 531 for securing the terminal bus bar 320.

[0072] The fixing member 531 can fix the second portion 322 of the terminal bus bar 320 and may include a fixing hole 531a.

[0073] A fixing pin (not shown) may be inserted into the fixing hole 531a. The second portion 322 of the terminal bus bar 320 can be fixed to the insulating cover 500 by being fixed by a fixing pin (not shown) inserted into a coupling hole 322a formed in the second portion 322 of the terminal bus bar 320 and coupled to the fixing hole 531a.

[0074] Therefore, the second portion 322 of the terminal bus bar 320 sits on the seating portion 530 of the insulating cover 500, and the second portion 322 sits on and contacts the fixing member 531 positioned on the seating portion 530.

[0075] Furthermore, a terminal cover portion (not shown) that covers one end (second portion 322) of the exposed terminal busbar 320 may be placed on the insulating cover 500.

[0076] On the other hand, as shown in Figures 6 to 10, in this embodiment, the battery module 1000 may include thermal resin layers 610 and 620.

[0077] As shown in Figure 6, in this embodiment, the second thermal conductive resin layer 610 may be placed on the lower plate 202 of the module case 200. Therefore, the second thermal conductive resin layer 610 may be placed on the underside of the battery cell stack 100 within the module case 200.

[0078] In this embodiment, the second thermal conductive resin layer 610 may be formed by applying or pouring a thermal conductive resin onto the upper surface of the lower plate 202 of the module case 200 (the upper surface of the lower plate 202 facing the interior of the module 1000). The second thermal conductive resin layer 610, positioned between the battery cell stack 100 and the lower plate 202 of the module case 200, can transfer heat from the battery cell stack 100 to the lower plate 202 of the module case 200 to cool the battery cell stack 100.

[0079] The module case 200 shown in Figure 6 has an example structure that includes a U-shaped frame 210, but it can also consist of a single frame.

[0080] Furthermore, although the second thermally conductive resin layer 610 is located on the lower plate 202 of the module case 200 in Figure 6, it may also be located on both the lower plate 202 and the side surface 203 of the module case 200.

[0081] In this embodiment, the thermally conductive resin can have adhesive and thermoplastic properties, and a variety of thermally conductive adhesives can be used as the thermally conductive resin. For example, a variety of organic and / or inorganic thermally conductive adhesives such as thermally conductive epoxy adhesive, thermally conductive silicone adhesive, and thermally conductive urethane adhesive can be used in the battery module 1000 according to one embodiment of the present invention.

[0082] Furthermore, as shown in Figures 6, 7, 11, and 12, in this embodiment, the first thermally conductive resin layer 620 may be placed on the upper side of the battery cell laminate 100.

[0083] The first thermally conductive resin layer 620 may be formed by injecting or coating a thermally conductive resin onto the upper surface or upper side of the battery cell stack 100. The first thermally conductive resin layer 620, positioned between the battery cell stack 100 and the upper plate 201, can transfer heat from the battery cell stack 100 to the upper plate 201 of the module case 200, thereby cooling the battery cell stack 100.

[0084] Specifically, in this embodiment, the thermally conductive resin for forming the first thermally conductive resin layer 620 may be injected through the upper plate assembly 200 bonded to the upper side of the U-shaped frame 210. Therefore, in this embodiment, the module case 200 may include the U-shaped frame 210 and the upper plate assembly 220 shown in Figure 6.

[0085] As shown in Figures 8, 11, and 12, in this embodiment, the upper plate assembly 220 may include an upper plate 201 joined to the upper side of the U-shaped frame 210, a film 221 placed on the upper plate 201, and a block pad 230 placed on the film 221.

[0086] The top plate 201 is joined to the upper side of the U-shaped frame 210, and the top plate 201 may be joined to the U-shaped frame 210 by welding. Specifically, both side edges of the top plate 201 may be joined to the upper ends of both side surfaces 203 of the U-shaped frame 210 by welding. As an example, the top plate 201 may be joined to the U-shaped frame 210 by laser welding.

[0087] The side edges of the upper plate 201 may each include welded sections 201b that are welded along their length, and unwelded sections 201c between the welded sections 201b that are not welded.

[0088] Figures 8, 11, and 12 show examples in which four welded sections 201b and three non-welded sections 201c are formed on the upper plate 201, but the number of welded sections 201b and non-welded sections 201c can be changed.

[0089] Furthermore, one or more injection holes 201a may be formed in the upper plate 201. The injection holes 201a are for injecting thermally conductive resin, and the thermally conductive resin may be injected from outside the battery module 1000 through these injection holes 201a. Figure 8 shows an example in this embodiment in which four injection holes 201a are formed, and the number of injection holes 201a can be changed.

[0090] In the upper plate assembly 220, the film 221 may be attached to the upper plate 201, and may, for example, be a polycarbonate film. The film 221 is placed between the upper plate 201 and the battery cell laminate 100, and can serve as electrical insulation between the upper plate 201 and the battery cell laminate 100.

[0091] As shown in Figure 8, the film 221 may have through holes 221a formed therein. The through holes 221a are positioned to correspond to the injection holes 201a of the upper plate 201 and can communicate with the injection holes 201a, so that the thermally conductive resin can be injected from the outside to the upper side of the battery cell laminate 100 through the injection holes 201a and the through holes 221a.

[0092] In the upper plate assembly 220, the block pad 230 may be bonded to the film 221, which can restrict the flow of the thermally conductive resin poured onto the battery cell laminate 100.

[0093] In this embodiment, as shown in Figure 8, two block pads 230 may be arranged parallel to each other on the film 221, spaced apart in the longitudinal direction of the top plate 201 (or the longitudinal direction of the battery module 100, in the Y-axis direction).

[0094] Therefore, the thermally conductive resin injected through the injection holes 201a and through holes 221a cannot flow beyond the block pads 230 on the battery cell laminate 100 and remains filled between the two block pads 230.

[0095] Each end of the block pad 230 may extend to the edge of the top plate 201. Specifically, in Figure 8, the upper end of the block pad 230 may extend to the upper edge of the top plate 201, and the lower end of the block pad 230 may extend to the lower edge of the top plate 201.

[0096] Furthermore, the end of the block pad 230 may be located in the non-welded section 201c at the edge of the upper plate 201. That is, in Figure 8, the upper end of the block pad 230 may be located in the non-welded section 201c at the upper edge of the upper plate 201, and the lower end of the block pad 230 may be located in the non-welded section 201c at the lower edge of the upper plate 201.

[0097] As described above, the edge of the upper plate 201 has a welded section 201b and a non-welded section 201c arranged along its length, and by positioning the end of the block pad 230 in the non-welded section 201c where it is not welded, it is possible to prevent the block pad 230 from deforming or changing in quality during the welding process of the upper plate 201, and to prevent a decrease in the function of the block pad 230.

[0098] A compressible material can be used for the block pad 230. Within the module case 200, the block pad 230 is compressed in contact with the upper surface of the battery cell stack 100, and thus the block pad 230 adheres tightly to the upper surface of the battery cell stack 100, thereby firmly preventing the flow of the injected thermally conductive resin.

[0099] The block pad 230 may be a foam pad. For example, the block pad 230 can be made of urethane foam, shock-absorbing memory foam, or a rubber pad.

[0100] On the other hand, although it has been described that in the upper plate assembly 220, the film 221 is placed on the upper plate 201 and the block pad 230 is placed on the film 221, in the battery module 1000, the film 221 may be placed below the upper plate 201 and the block pad 230 may be placed below the film 221.

[0101] In this way, the film 221 is attached to the top plate 201, and the block pad 230 is bonded to the film 221. After the top plate assembly 220 is assembled, it can be bonded to the U-shaped frame 210 to form the module case 200.

[0102] On the other hand, Figure 10 shows that in this embodiment, thermally conductive resin is injected through the upper plate 201 of the module case 200 of the battery module 1000. As shown in the figure, in the battery module 1000 according to this embodiment, after the upper plate 201 or upper plate assembly 220 is completely welded to the U-shaped frame 210, thermally conductive resin can be injected through the four injection holes 201a.

[0103] When the thermal conductive resin is injected through the injection hole 201a, the injected thermal conductive resin moves to the upper surface of the battery cell stack 100 through the through-hole 221a of the film 221 attached to the lower surface of the upper plate 201. The thermal conductive resin that has moved to the upper surface of the battery cell stack 100 moves to the two block pads 230 facing each other in the longitudinal direction (Y-axis direction or -Y-axis direction) of the battery module 1000, and moves to both sides 203 of the module case 200 in the width direction (X-axis direction or -X-axis direction) of the battery module 1000.

[0104] Therefore, the thermally conductive resin injected through the injection hole 201a of the upper plate 201 fills the space defined by the upper surface of the battery cell laminate 100, the two opposing block pads 230, the side surface 203 of the module case 200, and the upper plate 201, forming the first thermally conductive resin layer 620 on the upper side of the battery cell laminate 100.

[0105] As described above, in the battery module 1000 according to a preferred embodiment of the present invention, a first thermally conductive resin layer 620 is formed on the upper side of the battery cell stack 100, and a second thermally conductive resin layer 610 is formed on the lower side of the battery cell stack 100.

[0106] Thus, in this embodiment, since the first and second thermally conductive resin layers 620 and 610 are formed on the upper and lower sides of the battery module 1000, heat can be transferred to the upper and lower sides of the battery cell laminate 100, thereby improving cooling performance. Furthermore, during high-speed charging, a higher current flows in, requiring increased cooling performance. In the battery module 1000 according to a preferred embodiment of the present invention, cooling performance is improved, and high-speed charging capability can be enhanced.

[0107] As described above, one or more battery modules 1000 according to the present invention can form a battery pack 2000. As shown in Figure 13, a battery pack 2000 according to one embodiment of the present invention can house at least one or more battery modules 1000 inside a pack case 2100 and can include various control and protection systems such as a BMS (Battery Management System) and a cooling system.

[0108] 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 can accommodate multiple battery modules 1000 in the internal space of the lower housing 2110 and the upper housing.

[0109] On the other hand, while the embodiment of the present invention shows an example in which a plurality of battery modules 1000 are housed inside the battery pack 2000, a plurality of battery cells 110 may be immediately placed inside the battery pack 2000.

[0110] The battery module 1000 and battery pack according to the present invention, configured in this manner, can be applied to a variety of devices. Specifically, they can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles, as well as to energy storage systems (ESS), but are not limited to these, and can be applied to a variety of devices that can use secondary batteries.

[0111] Figure 14 shows an electric vehicle V equipped with a battery pack 2000. In electric vehicle V, the wheels are driven by a motor that receives power from the battery pack 2000, allowing the electric vehicle to operate.

[0112] Although the present invention has been described above based on preferred embodiments, it is not limited to the embodiments described above, and various modifications and alterations are possible by persons with ordinary skill in the art to which the present invention pertains, without departing from the spirit of the invention. [Industrial applicability]

[0113] The present invention can provide a battery module with improved cooling performance and a battery pack including the same.

Claims

1. A battery cell stack in which multiple battery cells are stacked, A module case for housing the aforementioned battery cell stack, A battery module comprising a first thermally conductive resin layer disposed on the upper side of the battery cell stack inside the module case, The aforementioned module case is The bottom board and It includes an upper plate positioned above and separated from the lower plate, The aforementioned battery module is The above further includes two block pads positioned below the upper plate and spaced apart from each other, The edge of the upper plate is provided with one or more welded sections and one or more non-welded sections along its length. The end of the block pad is positioned in the non-welded section of the upper plate, which is a battery module.

2. The battery module according to claim 1, wherein the first thermally conductive resin layer is located between the two block pads.

3. The battery module according to claim 1, wherein the upper plate includes one or more injection holes for injecting a thermally conductive resin.

4. The battery module according to claim 1, wherein the block pad is compressible.

5. The battery module according to claim 1, wherein the block pad is a foam pad.

6. The battery module according to claim 1, wherein both ends of the block pad are respectively positioned on both side edges of the upper plate.

7. The battery module according to claim 1, further comprising a film disposed between the upper plate and the block pad.

8. The battery module according to claim 1, wherein the non-welded section is located between the welded sections.

9. A battery cell laminate in which a plurality of battery cells are stacked, A module case for housing the aforementioned battery cell stack, A battery module comprising a first thermally conductive resin layer disposed on the upper side of the battery cell stack inside the module case, The aforementioned module case is The bottom board and It includes an upper plate positioned above and separated from the lower plate, The aforementioned battery module is The above further includes two block pads positioned below the upper plate and spaced apart from each other, On both sides of the upper plate, one or more welded sections and one or more non-welded sections are arranged along their respective longitudinal directions. Both ends of the block pad are battery modules, each positioned in the non-welded section of the upper plate.

10. A battery cell laminate in which multiple battery cells are stacked, A module case for housing the aforementioned battery cell stack, The module case includes a first thermally conductive resin layer disposed on the upper side of the battery cell stack, The module case includes an upper plate assembly, The aforementioned upper plate assembly is An upper plate positioned above the aforementioned battery cell stack, The upper plate includes two block pads positioned below it and spaced apart from each other, The edge of the upper plate is provided with one or more welded sections and one or more non-welded sections along its length. The end of the block pad is positioned in the non-welded section of the upper plate, which is a battery module.

11. The battery module according to claim 1, further comprising a second thermally conductive resin layer disposed below the battery cell stack inside the module case.

12. The battery module according to claim 11, wherein the second thermally conductive resin layer is disposed on the lower plate.

13. A busbar frame arranged on one side of the aforementioned battery cell stack, The battery module according to claim 1, further comprising an insulating cover disposed on the outside of the busbar frame.

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