Battery pack having improved cooling performance

Abstract

A battery pack according to an embodiment of the present invention includes: one or more battery modules: a housing which accommodates the battery modules and includes a lid on the upper part thereof; and a top heat sink disposed in an upper part of the housing and above the battery module, wherein the top heat sink is characterized by being integrated with the lid. The battery pack according to an embodiment of the present invention has the effect of delaying the rate of heat transfer when the battery module in the battery pack experiences an excessive rise in temperature or ignites, controlling the temperature of the pack lid, and preventing a structural collapse of the upper part of the pack.

Description

Battery pack with improved cooling performance

[0001] The present invention relates to a battery pack having improved cooling performance, and more particularly, to a battery pack in which cooling is performed not only at the bottom but also at the top of the battery pack.

[0002] 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.

[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 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.

[0004] 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.

[0005] Typically, a battery pack (10) has a structure in which a plurality of battery modules (1) are accommodated within a pack housing (11) as illustrated in FIG. 1, and in order to maintain structural stability, a plurality of battery modules (1) or battery module assemblies can generally be arranged on the same plane.

[0006] However, in the case of overcharging, etc. in such a battery pack (10), the temperature of the battery module (1) may rise excessively, and an explosion or fire may occur due to swelling. In addition, such an explosion or fire may cause a greater risk of loss of life.

[0007] Therefore, as shown in Fig. 2, it is necessary to delay thermal runaway in case of excessive temperature rise or ignition of some battery modules (1) within the battery pack (10) and to control the maximum temperature of the case (particularly the lid) of the pack (10).

[0008] The present invention aims to provide a battery pack capable of delaying the heat transfer rate when a battery module in a battery pack experiences excessive temperature rise or ignition, controlling the temperature of a pack lead, and preventing structural collapse of the upper portion of the pack.

[0009] A battery pack according to one embodiment of the present invention comprises: one or more battery modules; a housing that accommodates the battery modules and includes a lid at an upper portion; and an upper heat sink disposed above the battery modules at an upper portion of the housing, wherein the upper heat sink is characterized in that it is formed integrally with the lid.

[0010] Additionally, the upper heat sink includes a cooling passage through which coolant flows.

[0011] Additionally, the battery pack further includes a flame cover sheet disposed on the lower side of the upper heat sink above the battery module.

[0012] Additionally, the flame cover sheet includes mica.

[0013] Additionally, the upper heat sink is positioned on the lower side of the lead.

[0014] Additionally, the upper heat sink is bonded to the lead.

[0015] Additionally, the upper heat sink is brazed to the lead.

[0016] Additionally, the battery pack further includes a flame cover sheet disposed above the battery module, and the flame cover sheet is disposed below the upper heat sink.

[0017] Additionally, the flame cover sheet is bonded to the lower surface of the upper heat sink.

[0018] Additionally, the flame cover sheet is attached to the upper heat sink by an adhesive.

[0019] Additionally, the battery pack further includes a lower heat sink disposed at the lower portion of the housing.

[0020] Additionally, the lower heat sink includes a cooling passage through which coolant flows.

[0021] A battery pack having improved cooling performance according to one embodiment of the present invention has the effect of delaying the heat transfer rate when the battery module in the battery pack experiences excessive temperature rise or ignition, controlling the temperature of the pack lead, and preventing structural collapse of the upper part of the pack.

[0022] Figure 1 is a drawing illustrating a conventional battery pack,

[0023] Figure 2 is a drawing showing the ignition of some battery modules in Figure 1.

[0024] FIG. 3 is a drawing illustrating a battery pack according to one embodiment of the present invention.

[0025] Figure 4 is a perspective view of a battery module in one embodiment of the present invention.

[0026] Figure 5 is an exploded perspective view of a battery module in one embodiment of the present invention.

[0027] Figure 6 is a perspective view of a battery cell in one embodiment of the present invention.

[0028] Figure 7 is a cross-sectional view of a battery pack according to an embodiment of the present invention.

[0029] FIG. 8 is a drawing showing the flow path of a heat sink in one embodiment of the present invention.

[0030] FIG. 9 is a drawing briefly showing the temperature rise and temperature suppression when a battery module ignites in one embodiment of the present invention.

[0031] FIG. 10 is a drawing showing an upper heat sink being bonded to a pack lid in one embodiment of the present invention.

[0032] 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.

[0033] In order to clearly represent multiple layers and regions in the drawings, the thickness may be enlarged. Similar parts are designated by the same drawing reference numerals throughout the specification. When an element such as a layer, film, region, or plate is said to be "over" another element, this includes not only the case where it is "directly over" that element but also the case where there are other elements in between. Conversely, when an element is said to be "directly over" another element, this means that there are no other elements in between. Furthermore, when an element such as a layer, film, region, or plate is said to be "under" another element, this includes not only the case where it is "directly under" that element but also the case where there are other elements in between. Conversely, when an element is said to be "directly under" another element, this means that there are no other elements in between.

[0034] A battery pack (2000) having improved cooling performance according to the present invention is described in detail with reference to the drawings.

[0035] FIG. 3 is a drawing showing a battery pack according to an embodiment of the present invention, FIG. 4 is a perspective view of a battery module according to an embodiment of the present invention, FIG. 5 is an exploded perspective view of a battery module according to an embodiment of the present invention, FIG. 6 is a perspective view of a battery cell according to an embodiment of the present invention, FIG. 7 is a longitudinal cross-sectional view of a battery pack according to an embodiment of the present invention, FIG. 8 is a drawing showing a flow path of a heat sink according to an embodiment of the present invention, FIG. 9 is a drawing briefly showing temperature rise and temperature suppression upon ignition of a battery module according to an embodiment of the present invention, and FIG. 10 is a drawing showing an upper heat sink being connected to a pack lid according to an embodiment of the present invention.

[0036] A battery pack (2000) having improved cooling performance according to one embodiment of the present invention may include one or more battery modules (1000) and a housing (2100) that accommodates the battery modules (1000).

[0037] The housing (2100) can accommodate a plurality of battery modules (1000) and can include a bottom portion (2110), a side portion (2120), and a lid (2130) as shown in FIGS. 3 and 7.

[0038] The bottom portion (2110) of the housing (2100) can form the bottom of the housing (2100) in the form of a plate extending horizontally.

[0039] The side portion (2120) of the housing (2100) forms the side of the housing (2100), and may include a left side portion (2121) forming the left side of the housing (2100), a right side portion (2122) forming the right side of the housing (2100), a front portion (2123) forming the front of the housing (2100), and a rear portion (2124) forming the rear of the housing (2100).

[0040] Accordingly, the left side portion (2121) and the right side portion (2122) of the side portion (2120) can be positioned at the left and right edges of the bottom portion (2110), respectively, and the front portion (2123) and the rear portion (2124) can be positioned at the front and rear edges of the bottom portion (2110), respectively.

[0041] In this embodiment, the housing (2100) is depicted as having a square box shape as shown, but is not limited thereto and may be configured in various shapes, including polygons.

[0042] The lid (2130) may be formed in the form of a plate that is placed on the upper portion of the housing (2100) and extends horizontally, and may cover the internal space of the housing (2100) formed by the bottom portion (2110) and the side portion (2120). The lid (2130) may be connected to the upper portion of the side portion (2120), and specifically, the edge of the lid (2130) may be joined to the upper portions of the left side portion (2121), the right side portion (2122), the front portion (2123), and the rear portion (2124) that form the side portion (2120) by means of bolts, welding, or the like.

[0043] And, although not shown, a bulkhead (not shown) may be placed between each battery module (1000) on the bottom (2110).

[0044] The above battery module (1000) may include a battery cell stack (100) in which a plurality of battery cells (110) are stacked along one direction, as illustrated in FIGS. 4 to 6, a module case (200) that accommodates the battery cell stack (100), a bus bar frame (300) positioned on the front and / or rear surface of the battery cell stack (100), an end plate (400) covering the front and / or rear surface of the battery cell stack (100), and a bus bar (310, 320) mounted on the bus bar frame (300).

[0045] 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. 5.

[0046] 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.

[0047] 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).

[0048] 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.

[0049] A battery cell (110) provided in a pouch type may include an electrode assembly and a cell case (115) that accommodates the electrode assembly (see FIG. 6).

[0050] 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 as a single piece. In addition, as illustrated in FIG. 4, 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Additionally, the electrode assembly may include two electrode tabs and two electrode leads (111, 112) each connected to the electrode tabs by a weld.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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).

[0059] The structure of the module case (200) may vary, and for example, the structure of the module case (200) may be a mono-frame structure. Here, the mono-frame may be in the form of a metal plate having an upper surface, a lower surface, and both side surfaces that are integrated. The mono-frame may 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 and an upper plate (upper surface (201)) are combined. In the case of a structure in which a U-shaped frame and an upper plate are combined, the structure of the module case (200) may be formed by combining an upper plate on the upper side of a U-shaped frame, which is a metal plate having a lower surface and both side surfaces that are combined or integrated, and each frame or plate may be manufactured by press molding. In addition, the structure of the module case (200) may be provided as an L-shaped frame structure in addition to a mono-frame or a U-shaped frame, and may be provided as various structures not described in the above-described examples.

[0060] 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.

[0061] 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).

[0062] 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 y-axis direction in the drawing.

[0063] 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 side of the inner surface 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).

[0064] 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. At least one of a busbar (310, 320) and a module connector can be mounted on the busbar frame (300). As illustrated in FIG. 5, one side of the busbar frame (300) is connected to the front or rear side of the battery cell stack (100), and the other side of the busbar frame (300) can be connected to the busbar (310, 320).

[0065] 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.

[0066] The busbar frame (300) may be positioned on the front and rear sides of the battery cell stack (100), respectively.

[0067] The busbar (310, 320) is mounted 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. The busbar (310, 320) is positioned between the battery cell stack (100) or busbar frame (300) and the end plate (400), thereby being protected from external impacts, etc., and minimizing the deterioration of durability due to external moisture, etc.

[0068] The bus bar (310, 320) can be electrically connected to the battery cell stack (100) through the electrode lead (111, 112) of the battery cell (110).

[0069] Specifically, the electrode leads (111, 112) of the battery cells (110) can be bent and connected to the bus bars (310, 320) after passing through the slits formed in the bus bar frame (300). The battery cells (110) constituting the battery cell stack (100) can be connected in series or in parallel by the bus bars (310, 320).

[0070] The busbars (310, 320) may include terminal busbars (320) for electrically connecting one battery module (1000) to another battery module (1000). 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.

[0071] The terminal bus bar (320) may further include a protrusion protruding upward, unlike other bus bars (310), and the protrusion may be exposed to the outside of the battery module (1000) through the terminal opening (410). The terminal bus bar (320) may be connected to another battery module (1000) or a BDU (Battery Disconnect Unit) by the protrusion exposed through the terminal opening (410), and may form an HV (High voltage) connection with them.

[0072] The end plate (400) may be used to protect the battery cell stack (100) and electrical components connected thereto from external physical impact by covering the open surface of the module case (200). 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.

[0073] 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 a method such as welding.

[0074] Additionally, an insulating cover (500) for electrical insulation may be positioned between the end plate (400) and the busbar frame (300). The insulating cover (500) may include an electrically insulating material and may block the busbars (310, 320) from contacting the end plate (400). 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. The end plate (400) may be positioned on one surface and the other surface of the module case (200) so as to cover both surfaces of the battery cell stack (100).

[0075] In addition, the battery pack (2000) according to the present invention may further include a coolant inlet (2200), a coolant outlet (2300), a lower heat sink (2400), an upper heat sink (2500), and a flame cover sheet (3000).

[0076] The above coolant inlet (2200) is intended to allow coolant to flow into the battery pack (2000) from the outside, and the coolant flows into the battery pack (2000) through the coolant inlet (2200) from the outside. The coolant flowing in through the coolant inlet (2200) can flow into the upper heat sink (2500) and the lower heat sink (2400). As illustrated in FIG. 3, the coolant inlet (2200) can be positioned on one side of the side portion (2120) of the housing (2100), but its location may be changed. The coolant may be, for example, coolant.

[0077] The above coolant outlet (2300) is intended to allow coolant to flow out of the battery pack (2000), and the coolant flows out of the battery pack (2000) through the coolant outlet (2300). The coolant discharged from the upper heat sink (2500) and the lower heat sink (2400) can move to the coolant outlet (2300).

[0078] The lower heat sink (2400) may be disposed at the bottom of the battery pack (2000) as shown in FIG. 7 to cool the lower portion of the battery pack (2000). Specifically, the lower heat sink (2400) may be disposed at the lower portion (2110) of the battery pack (2000) and may be coupled to the bottom portion (2110). The lower heat sink (2400) includes a cooling path (2410) through which coolant introduced through an inlet (2411) moves, and as the coolant moves through the cooling path (2410), the lower portion of the battery pack (2000) is cooled, and the coolant may be discharged through an outlet (2412) formed at one end of the cooling path (2410).

[0079] The upper heat sink (2500) may be arranged on the upper portion of the battery pack (2000) to cool the upper portion of the battery pack (2000). Specifically, the upper heat sink (2500) may be arranged on the upper or lower portion of the lid (2130) of the battery pack (2000) and may be integrally coupled to the lid (2130). In the drawing of the present embodiment, an example in which the upper heat sink (2500) is arranged on the lower portion of the lid (2130) is illustrated, and may be integrally formed with the lid (2130). The upper heat sink (2500) may be joined to the lid (2130) by brazing, welding, or the like. Therefore, the lid (2130) of the present embodiment may be joined to the upper heat sink (2500) to form an integral cooling lid.

[0080] The upper heat sink (2500) includes a cooling path (2510) through which a coolant moves, and the coolant is introduced through an inlet (2511) at one end of the cooling path (2510), and as the coolant moves through the cooling path (2510), it cools the upper portion (or lid (2130)) of the battery pack (2000), and the coolant can be discharged through an outlet (2512) at the other end of the cooling path (2510). Therefore, the upper heat sink (2500) can control the temperature of the lid (2130).

[0081] FIG. 8 is a drawing showing an example of a cooling path (2510, 2410) of an upper heat sink (2500) (or a lower heat sink (2400)).

[0082] The cooling path (2510, 2410) of the upper heat sink (2500) (or the lower heat sink (2400)) may be formed in a zigzag shape as shown, and an inlet (2511, 2411) through which a refrigerant flows may be arranged at one end of the cooling path (2510, 2410), and an outlet (2512, 2412) through which a refrigerant flows out may be arranged at the other end of the cooling path (2510, 2410).

[0083] The above flame cover sheet (3000) can protect the lead (2130) and the upper heat sink (2500) from flames caused by ignition of the battery module (1000) on the upper portion of the housing (2100). Specifically, in the present embodiment, the flame cover sheet (3000) can be coupled to the lower portion of the upper heat sink (2500) and can be coupled in contact with the lower surface of the upper heat sink (2500). For example, the flame cover sheet (3000) can be attached to the lower surface of the upper heat sink (2500) by an adhesive (e.g., a structural adhesive). An adhesive can be applied to one surface of the flame cover sheet (3000), and an adhesive layer can be formed on one surface of the flame cover sheet (3000).

[0084] The flame cover sheet (3000) may be made of mica or FRB (3M), other refractory materials, or may include mica and other refractory materials.

[0085] In this embodiment, the flame cover sheet (3000) is placed under the lid (2130) or the upper heat sink (2500) in this way, so that when a flame occurs due to ignition of the battery module (1000) under the flame cover sheet (3000), the lid (2130) and the upper heat sink (2500) can be protected from the flame, and the upper structure of the battery pack (2000) can be prevented from collapsing.

[0086] In accordance with one embodiment of the present invention, a battery pack (2000) has upper and lower heat sinks (2500, 2400) that cool the upper and lower portions of the battery pack (2000), respectively. As shown in FIG. 9, when thermal propagation (unpredicted explosion, gas and flame eruption caused by abnormal behavior inside a cell) occurs due to ignition of a battery module (1000) within the pack (2000), the flame cover sheet (3000) protects the lid (2130) and the upper heat sink (2500) from the flame, and the temperature rise of the lid (2130) due to the flame and gas can be controlled through the upper heat sink (2500). In addition, the temperature of the lead (2130) is controlled through the upper heat sink (2500) in the battery pack (2000), and internal air cooling is performed to delay heat transfer and prevent collapse of the upper structure (lead (2130) and upper heat sink (2500)) of the battery pack (2000).

[0087] Figure 10 is a drawing showing an example in which the upper heat sink (2500) is joined to and integrated with the lead (2130).

[0088] Specifically, the upper heat sink (2500) may be brazed to the lead (2130) from the lower side of the lead (2130). As another example, the upper heat sink (2500) may be bonded to the upper side of the lead (2130).

[0089] Meanwhile, in a battery pack (2000) according to one embodiment of the present invention, a plurality of battery cells (110) may be directly arranged. That is, a battery cell stack (100) in which a plurality of battery cells (110) are stacked may be directly arranged in a housing (2100) without a module case (200).

[0090] The battery pack according to the present invention may additionally include various control and protection systems, such as a BMS (Battery Management System).

[0091] The battery module (1000) and battery pack (2000) according to the present invention can be applied to various devices. Specifically, they can be applied to means of transportation 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.

[0092] 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.

[0093] The present invention can provide a battery pack that can delay the heat transfer rate when a battery module in a battery pack experiences excessive temperature rise or ignition, control the temperature of a pack lead, and prevent structural collapse of the upper part of the pack.

Claims

1. One or more battery modules; A housing that accommodates the battery module and includes a lid on the upper portion; and An upper heat sink disposed above the battery module at the upper portion of the housing; A battery pack wherein the upper heat sink is integrally formed with the lead.

2. In paragraph 1, The upper heat sink is a battery pack including a cooling channel through which coolant flows.

3. In paragraph 1, A battery pack further comprising a flame cover sheet disposed on the lower side of the upper heat sink above the battery module.

4. In paragraph 3, The above flame cover sheet is a battery pack containing mica.

5. In paragraph 1, The battery pack wherein the upper heat sink is positioned on the lower side of the lead.

6. In paragraph 1, The upper heat sink is a battery pack that is bonded to the lead.

7. In paragraph 1, The battery pack wherein the upper heat sink is brazed to the lead.

8. In paragraph 1, Further comprising a flame cover sheet disposed above the battery module, A battery pack wherein the flame cover sheet is placed on the lower side of the upper heat sink.

9. In paragraph 8, The above flame cover sheet is a battery pack that is bonded to the lower surface of the upper heat sink.

10. In paragraph 9, A battery pack wherein the above flame cover sheet is attached to the upper heat sink by an adhesive.

11. In paragraph 1, A battery pack further comprising a lower heat sink disposed at the lower portion of the housing.

12. In paragraph 11, The lower heat sink is a battery pack including a cooling channel through which coolant flows.

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