Battery box

Abstract

The present invention relates to a battery box. According to one aspect of the present invention, the battery box may comprise: a battery cell including an electrode assembly extending in one direction, an exterior film for accommodating the electrode assembly, and a cap coupled to the exterior film and shielding one side of the electrode assembly in a longitudinal direction; and a frame supporting the battery cell and having an opening, wherein the exterior film includes: an accommodation unit surrounding the electrode assembly; and a venting unit provided on one side of the accommodation unit, and the venting unit is disposed to face the opening.

Description

battery box

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0086931, filed July 2, 2024, and Korean Patent Application No. 10-2024-0171993, filed November 27, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a battery box, and more specifically, to a battery box capable of charging and discharging electric energy.

[0005] The recent rapid proliferation of battery-powered electronic devices, such as mobile phones, laptops, and electric vehicles, has led to a rapid increase in demand for compact, lightweight, and relatively high-capacity secondary batteries. Lithium secondary batteries, in particular, are attracting attention as power sources for portable devices due to their lightweight nature and high energy density.

[0006] Secondary batteries can be manufactured in cell form, and multiple battery cells can be packaged in a specific case or housing to form a battery box. Meanwhile, internal gas may be released from battery cells for a variety of reasons. For example, unexpected external physical and / or thermal shocks can partially destroy a battery cell, releasing internal gas.

[0007] Because these gases can adversely affect other battery cells or battery boxes in the vicinity, it is desirable to control their release to a specific location and direction. Accordingly, there has been a pressing need to develop a battery box capable of effectively controlling the location and direction of gases emitted from battery cells.

[0008] The present invention has been devised to solve the above problems, and the object of the present invention is to provide a battery box in which the location and direction in which gas from a battery cell is discharged can be effectively controlled.

[0009] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0010] According to one aspect of the present invention, a battery box is provided, comprising: a battery cell including an electrode assembly extending in one direction; an outer film accommodating the electrode assembly; and a cap coupled to the outer film and shielding one longitudinal side of the electrode assembly; and a frame supporting the battery cell and having an opening, wherein the outer film includes a receiving portion surrounding the electrode assembly; and a venting portion provided on one side of the receiving portion, wherein the venting portion is arranged to face the opening.

[0011] At this time, the cover frame includes a pair of support members arranged in parallel with the opening therebetween, and the battery cell can be supported by the pair of support members.

[0012] At this time, the battery cells are configured in multiple pieces and arranged along one direction, and the pair of support members can extend parallel to the one direction.

[0013] At this time, the caps are configured as a pair and are provided on each side of the electrode assembly, and the pair of supporting parts can each support the pair of caps.

[0014] At this time, the caps are configured as a pair and are provided on each side of the electrode assembly, and the battery cell includes a pair of terminals that are respectively electrically connected to the negative and positive electrodes of the electrode assembly, and the pair of terminals can be respectively coupled to the pair of caps.

[0015] At this time, the cover frame may have a plate shape on which the battery cell can be placed.

[0016] At this time, the opening may include a plurality of venting holes formed in the cover frame.

[0017] At this time, the venting portion may extend in one direction, and the venting hole may extend in the longitudinal direction of the venting portion.

[0018] At this time, the battery cell is composed of a plurality of cells, and the plurality of venting holes can correspond to the plurality of battery cells, respectively.

[0019] At this time, the plurality of battery cells may be arranged in one direction, and the plurality of venting holes may also be arranged along the one direction.

[0020] At this time, the venting portion can be closely attached to the cover frame so as to be adjacent to the opening.

[0021] At this time, a pressing frame that presses the battery cell toward the cover frame may be further included.

[0022] At this time, the pressurized frame may be positioned on the opposite side of the cover frame with the battery cell therebetween.

[0023] At this time, the pressurized frame may have a plate shape in which one side is in contact with the battery cell.

[0024] At this time, the venting portion may be configured to rupture and discharge gas when the pressure in the receiving space increases.

[0025] At this time, the venting portion may include a sealing portion sealed in the longitudinal direction of the electrode assembly.

[0026] At this time, the venting portion may be arranged to be broken before the receiving portion due to an increase in pressure in the receiving space.

[0027] At this time, the venting portion may include a first connecting portion connected to one edge portion of the receiving portion; and a second connecting portion connected to another edge portion of the receiving portion and connected to the first connecting portion.

[0028] According to one aspect of the present invention, a predetermined opening is formed in a frame for supporting a battery cell, and a venting portion of the battery cell configured to discharge gas is configured to face the opening. Accordingly, the position and direction of gas discharged from the battery cell can be effectively controlled through the venting portion and the opening.

[0029] The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0030] Figure 1 is a perspective view of a battery box according to one embodiment of the present invention.

[0031] Figure 2 is an exploded perspective view of a battery box according to one embodiment of the present invention.

[0032] Figure 3 is a perspective view of the battery cell illustrated in Figure 1.

[0033] Figure 4 is a cross-sectional view according to II of Figure 3.

[0034] Figure 5 is a cross-sectional view according to II-II of Figure 3.

[0035] Figures 6 and 7 are drawings for explaining the process of gas being discharged through an opening in the battery cell of Figure 1.

[0036] Figure 8 is an exploded perspective view of a battery box according to another embodiment of the present invention.

[0037] Preferred embodiments of the present invention are described in detail so that those skilled in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited or restricted by the following examples.

[0038] In order to clearly explain the present invention, a detailed description of a part that is irrelevant to the description or a related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and when adding reference signs to components of each drawing in this specification, the same or similar reference signs are attached to the same or similar components throughout the specification.

[0039] In addition, terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0040] Fig. 1 is a perspective view of a battery box according to one embodiment of the present invention. Fig. 2 is an exploded perspective view of a battery box according to one embodiment of the present invention. Fig. 3 is a perspective view of the battery cell illustrated in Fig. 1. Fig. 4 is a cross-sectional view taken along line II of Fig. 3. Fig. 5 is a cross-sectional view taken along line II-II of Fig. 3. Figs. 6 and 7 are drawings for explaining a process in which gas is discharged through an opening in the battery cell of Fig. 1. In this case, components that are visible through the packaging in Fig. 1 are indicated by solid lines.

[0041] Figures 1 through 7 illustrate a battery box according to one embodiment of the present invention. Referring to Figures 1 through 4, a battery box (1) according to one embodiment of the present invention may be an assembly capable of charging or discharging electrical energy. To this end, the battery box (1) according to the present embodiment may include at least one battery cell (20).

[0042] At this time, the battery box (1) according to one embodiment of the present invention can be configured so that the position and direction of gas discharged from the battery cell (20) can be controlled very effectively. Through this, the battery box (1) according to the present embodiment can have very high stability and durability.

[0043] Referring to FIG. 1, a battery box (1) according to one embodiment of the present invention may include packaging (10). The packaging (10) may be configured to accommodate or protect other components of the battery box (1), or to provide a base on which other components are installed. For this purpose, the packaging (10) may be made of a material having a predetermined rigidity, such as metal or plastic.

[0044] In this embodiment, the packaging (10) may have a body shape with a predetermined space provided inside. The packaging (10) may be formed by joining a plurality of plates together. The packaging (10) may be provided with configurations for the operation or stability of the battery box (1). For example, the packaging (10) may be provided with a battery cell (20) described below, a terminal for external current conduction, a plug for venting the inside of the packaging (10), etc., but is not limited thereto.

[0045] Meanwhile, in this embodiment, the packaging (10) has been described as a box-shaped structure. However, the shape of the packaging (10) may be appropriately modified as needed. For example, the packaging (10) may have a stepped or curved shape in one portion.

[0046] Referring to FIGS. 1 and 2, a battery box (1) according to one embodiment of the present invention may include a cover frame (12). The cover frame (12) may be a frame for covering one side of a battery cell (20) described below. In the illustrated embodiment, the cover frame (12) covers the lower side (negative direction of the Z-axis) of the battery cell (20).

[0047] In this embodiment, the cover frame (12) may be a plate provided on the inner surface of the packaging (10). For example, the cover frame (12) may be provided on the bottom surface of the packaging (10). Of course, the cover frame (12) may be formed as a part of the packaging (10) or may be provided on another surface of the packaging (10).

[0048] At this time, referring to FIGS. 2, 6, and 7, an opening (B) may be formed in the cover frame (12). In the present embodiment, the opening (B) may be defined as a predetermined space penetrating the cover frame (12) in the thickness direction. The opening (B) may be configured to allow gas emitted from a battery cell (20), which will be described later, to pass through. Through the position or direction of the opening (B), the position and direction of the gas emitted from the battery cell (20) may be controlled.

[0049] In the present embodiment, the opening (B) may include a plurality of venting holes (13). The number of venting holes (13) may correspond to the number of battery cells (20) described below. At this time, the plurality of venting holes (13) may be arranged along the left-right direction (Y-axis direction). The direction in which the plurality of venting holes (13) are arranged may be parallel to the direction in which the plurality of battery cells (20) are arranged.

[0050] Accordingly, a plurality of venting holes (13) can be positioned correspondingly to a plurality of battery cells (20). Here, the fact that the venting holes (13) and the battery cells (20) are positioned correspondingly may mean that the battery cells (20) and the venting holes (13) are positioned adjacent to each other so that gas or flames discharged from the venting portion (64) of the battery cells (20) described later can pass through the venting holes (13).

[0051] Meanwhile, in the present embodiment, the vent hole (13) may extend in one direction. For example, the vent hole (13) may have an elliptical shape extending in one direction. However, the shape of the vent hole (13) is not particularly limited as long as it can have a long length in a specific direction. For example, the vent hole (13) may have a rectangular shape having a long length in one direction.

[0052] At this time, in the present embodiment, the direction in which the venting hole (13) extends may be the front-back direction (X-axis direction). The direction in which the venting hole (13) extends may be parallel to the longitudinal direction of the venting portion (64) of the battery cell (20) described later. As will be described more specifically later, at least a portion of the venting portion (64) is arranged adjacent to or in close contact with the venting hole (13). Therefore, as the length of the venting hole (13) increases, the portion of the venting portion (64) adjacent to or in close contact with the venting hole (13) may increase.

[0053] This configuration can increase the probability that gas will flow into the vent hole (13) when gas is emitted from any part of the venting portion (64). This allows the location and direction of gas discharge to be more effectively controlled. Preferably, the extension length of the venting portion (13) may be greater than or equal to the length of the venting portion (64). In this case, most of the gas or flame emitted from the venting portion (64) will be able to pass through the venting portion (13).

[0054] Meanwhile, in the present embodiment, the cover frame (12) has been described as covering the lower side (negative direction of the Z-axis) of the battery cell (20). However, the cover frame (12) may also be configured to cover other parts of the battery cell (20). For example, the cover frame (12) may be configured to cover the left or right side of the battery cell (20). In such a case, the position at which the venting portion (64) is formed in the battery cell (20) should also be changed accordingly.

[0055] Referring again to FIG. 2, a battery box (1) according to one embodiment of the present invention may include a pressure frame (14). The pressure frame (14) may be a frame for pressing the battery cell (20) toward or positioning it adjacent to the cover frame (12).

[0056] In this embodiment, the pressurizing frame (14) may be positioned on the opposite side of the cover frame (12) with the battery cell (20) in between. As illustrated, the cover frame (12) may be positioned on the lower side (negative direction of the Z-axis) of the battery cell (20), and the pressurizing frame (14) may be positioned on the upper side (positive direction of the Z-axis).

[0057] In this embodiment, the pressurizing frame (14) may be a plate having a predetermined thickness. A pressurizing surface (15) may be provided on the lower surface of the pressurizing frame (14) to contact and pressurize the battery cell (20). The pressurizing frame (14) may be provided on the ceiling portion inside the packaging (10). However, if necessary, the pressurizing frame (14) may also be configured as a part of the packaging (10).

[0058] Meanwhile, as described above, the pressurizing frame (14) can pressurize the battery cell (20) toward the cover frame (12). To this end, a predetermined operating force can be applied to the pressurizing frame (14) and the cover frame (12) when manufacturing the battery box (1). For example, the pressurizing frame (14) and the cover frame (12) can be joined using a tension screw (not shown), but are not limited thereto. At this time, the battery cell (20) can be interposed between the pressurizing frame (14) and the cover frame (12) because a portion of the battery cell (20) includes a cap (40) having a predetermined rigidity.

[0059] Meanwhile, in the present disclosure, the battery box (1) may be understood to collectively refer to a battery module or a battery pack. Here, a battery module may be an assembly comprising a plurality of battery cells and packaging housing them, and a battery pack may be an assembly comprising at least one battery module and another packaging housing it. Of course, a battery pack may also be comprised of a plurality of battery cells and packaging housing them. A battery pack with this structure may be collectively referred to as a cell-to-pack structure.

[0060] Referring to FIGS. 1 to 5, a battery box (1) according to one embodiment of the present invention may include a battery cell (20). The battery cell (20) may be configured to perform a charging and discharging function of the battery box (1).

[0061] The battery cells (20) may be configured in multiple units and may be stacked or arranged along one direction. As illustrated, the plurality of battery cells (20) may be arranged in the left-right direction (Y-axis direction). The arrangement of the battery cells (20) may be appropriately changed. For example, the battery cells (20) may be arranged along multiple rows, or may be arranged to have multiple layers in the vertical direction (Y-axis direction).

[0062] Hereinafter, a battery cell (20) of a battery box (1) according to an embodiment of the present invention will be described in more detail. Referring to FIGS. 3 to 5, a battery cell (20) according to an embodiment of the present invention may include an electrode assembly (30). The electrode assembly (30) may be formed by sequentially stacking a negative electrode, a separator, and a positive electrode. The type of the electrode assembly (30) may be configured as a cylindrical type, a stacked type, a folding type, etc. depending on its shape, but the type or shape of the electrode assembly (30) is not limited to those described above.

[0063] Meanwhile, the electrode assembly (30) may be formed as an all-solid-state battery. More specifically, the electrode assembly (30) may be an assembly in which a plurality of positive electrodes, all-solid-state electrodes, and negative electrodes are laminated. Alternatively, the electrode assembly (30) may be a bipolar all-solid-state battery in which two or more unit cells including a positive electrode (or negative electrode), a solid electrolyte, and a porous current collector are connected in series.

[0064] In the present embodiment, an electrode tab (32) may be provided on one side of the electrode assembly (30). The electrode tab (32) may be configured to conduct current between the aforementioned negative electrode or positive electrode and the outside of the battery cell (20). The electrode tab (32) may be formed of a conductive film, but is not limited thereto.

[0065] The electrode tabs (32) may be configured in multiple numbers. The number of electrode tabs (32) may correspond to the number of cathodes and anodes of the electrode assembly (30). At this time, the electrode tabs (32) connected to the cathode and the electrode tabs (32) connected to the anode may extend in different directions from the electrode assembly (30). For example, the electrode tabs (32) connected to the cathode and the electrode tabs (32) connected to the anode may extend in opposite directions in the front and rear directions (X-axis direction).

[0066] In the present embodiment, the battery cell (20) may include a cap (40). The cap (40) may have a stronger rigidity than the outer film (60) described below. The caps (40) may be configured as a pair to cover both sides of the electrode assembly (30). For example, a pair of caps (40) may cover the front (positive direction of the X-axis) and the rear (negative direction of the X-axis) of the electrode assembly (30), respectively.

[0067] In this embodiment, the cap (40) may include a connecting portion (42). The connecting portion (42) may be configured to connect and bond the cap (40) and the outer film (60) to each other. To this end, the connecting portion (42) may be made of a material having good bonding properties with the outer film (60). For example, the connecting portion (42) may be made of a resin formed by sealing, or may be made of an adhesive. However, the material of the connecting portion (42) is not limited to that described above.

[0068] In this embodiment, the connecting portion (42) may include a cover portion covering one side of the electrode assembly (30) and a connecting portion provided along the periphery of the cover portion. The connecting portion may extend from the cover portion.

[0069] At this time, the connecting portion may extend from the cover portion toward the opposing cap (40). In other words, the connecting portion may extend toward the electrode assembly (30). An outer film (60) may be applied to and bonded to the outer surface of the connecting portion. At this time, the outer surface of the connecting portion may be a surface facing the outside of the electrode assembly (30).

[0070] In this embodiment, the cap (40) may include a cover portion (44). The cover portion (44) may be configured to enhance the structural stability of the cap (40). To this end, the cover portion (44) may be made of a material having stronger rigidity than the connecting portion (42). For example, the cover portion (44) may be made of metal or reinforced plastic, but the material of the cover portion (44) is not limited to that described above.

[0071] In the present embodiment, the cover portion (44) may include an exposed portion covering the outer surface of the cover portion of the connection portion (42) and a buried portion provided around the periphery of the exposed portion. At this time, the outer surface of the cover portion covered by the exposed portion may be a surface facing the outside of the electrode assembly (30). Through this, the cap (40) may have strong stability against external physical / chemical impacts or external forces.

[0072] At this time, the embedded portion may extend from the exposed portion toward the opposing cap (40). In other words, the embedded portion may extend toward the electrode assembly (30). At this time, the embedded portion may be embedded in the connecting portion (42). As a result, the bonding strength between the connecting portion (42) and the cover portion (44) may be increased. The bonding therebetween may be achieved by heat sealing or adhesive, but is not limited thereto. Meanwhile, if necessary, the connecting portion (42) may be provided only between the cover portion (44) and the outer film (60), and other parts of the cover portion (44) may be exposed to the outside without being embedded in the connecting portion (42).

[0073] Referring again to FIGS. 1 to 5, as previously described, the battery cell (20) according to the present embodiment includes a cap (40) having a predetermined rigidity. The cap (40) can stably support most of the external force applied to the battery cell (20). In this case, the external force may be a force that the aforementioned pressing frame (14) presses the battery cell (20) toward the cover frame (12).

[0074] In this embodiment, the cap (40) can support most of the external force in place of the outer film (60) described below. Therefore, the cap (40) can minimize the external force directly applied to the electrode assembly (30). Through this, the location and direction of gas discharge can be controlled in the battery box (1), while also improving structural stability.

[0075] Meanwhile, in the present embodiment, the battery cell (20) may include a terminal (50). The terminal (50) is configured to conduct current through the electrode assembly (30) to the outside. In the present embodiment, the terminals (50) are configured as a pair and can be respectively coupled to a pair of caps (40). At this time, the pair of terminals (50) can be respectively conducted to the negative and positive electrodes of the electrode assembly (30).

[0076] In this embodiment, the terminal (50) may be penetratedly connected to the cap (40). The terminal (50) may have a rivet structure so as not to be detached from the cap (40), but the structure or shape of the terminal (50) is not limited thereto. One side of the terminal (50) may be positioned on the inside of the cap (40), and the other side may be positioned on the outside of the cap (40). At this time, the inside of the cap (40) may be a portion facing the electrode assembly (30), and the outside of the cap (40) may be a portion facing the outside of the electrode assembly (30).

[0077] An electrode tab (32) may be joined to one side of the terminal (50). For example, the electrode tab (32) may be welded to one side of the terminal (50), but the joining method is not limited to a welding process. Through this, the electrode assembly (30) and the terminal (50) may be electrically connected. Meanwhile, although not shown, a gasket may be provided between the terminal (50) and the cap (40). The gasket may seal the space between the terminal (50) and the cap (40), thereby preventing leakage of the electrolyte.

[0078] Referring to FIGS. 2 to 5, a battery cell (20) according to one embodiment of the present invention may include an outer film (60). The outer film (60) may be configured to cover a portion of the electrode assembly (30). In this case, the portion may be the remaining portion of the electrode assembly (30) that is not covered by a pair of caps (40).

[0079] In the present embodiment, the outer film (60) may be formed of a material capable of changing its shape. For example, the outer film (60) may be bendable. Additionally, the outer film (60) may be formed of a non-elastic material. Conventionally, a pouch film was formed to form a space for accommodating the electrode assembly. However, since the outer film (60) does not need to change its shape through molding, it may be formed of a non-elastic material. That is, the outer film (60) may not be elastic.

[0080] The outer film (60) may be composed of a plurality of layers including a sealant layer, a barrier layer, and an insulating layer. The sealant layer, the barrier layer, and the insulating layer may be arranged in order from the inside closer to the electrode assembly (30).

[0081] The sealant layer may include a material having heat-sealing properties so that one end and the other end of the outer film (60) can be bonded. For example, the sealant layer of the outer film (60) may include one or more materials selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymers, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fiber. Mainly, a polyolefin resin such as polypropylene (PP) or polyethylene (PE) may be used, but is not limited thereto. In particular, polypropylene (PP) may have excellent mechanical properties such as tensile strength, rigidity, surface hardness, wear resistance, and heat resistance, and chemical properties such as corrosion resistance.

[0082] The barrier layer may include a metal. For example, the metal of the barrier layer may be one or more materials selected from the group consisting of iron (Fe), carbon (C), chromium (Cr), manganese (Mn), nickel (Ni), and aluminum (Al). As an example, the barrier layer may include stainless steel (STS). Additionally, the barrier layer may be formed of an alloy such as an aluminum alloy, but is not limited thereto.

[0083] The insulating layer may include an insulating material. That is, the electrode assembly (30) may be insulated from the outside by the insulating layer. Therefore, the insulating layer may prevent short circuits of the outer film (60), etc. For example, the insulating layer may include one or more materials selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymers, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fiber. Mainly, a polymer such as nylon resin or polyethylene terephthalate (PET) having wear resistance and heat resistance may be used, but is not limited thereto.

[0084] Referring to FIGS. 3 to 5, in the present embodiment, the outer film (60) may include a receiving portion (62). The receiving portion (62) may be a portion that covers the remaining portion of the electrode assembly (30) that is not covered by a pair of caps (40).

[0085] To this end, the receiving portion (62) can surround the electrode assembly (30) in the circumferential direction. At this time, the circumferential direction may be a direction surrounding an axis (X-axis) that is parallel to the longitudinal direction of the electrode assembly (30). In other words, the circumferential direction may be a direction surrounding an axis (X-axis) that is parallel to the direction in which a pair of caps (40) are spaced apart. Accordingly, a receiving space (A) in which the electrode assembly (30) is accommodated may be formed inside the receiving portion (62).

[0086] Referring to FIGS. 3 to 5, both sides of the receiving portion (62) can be respectively connected to the connecting portion (42) of a pair of caps (40). At this time, the both sides of the receiving portion (62) can be a portion of the front (positive direction of the X-axis) and rear (negative direction of the X-axis) sides.

[0087] And both sides of the receiving portion (62) can be joined to the connecting portion of the connecting portion (42). Both sides of the receiving portion (62) can surround the connecting portion of the connecting portion (42) in the circumferential direction. At this time, the receiving portion (62) and the connecting portion (42) can be joined by a sealing process using heat fusion, but the joining method thereof is not limited thereto.

[0088] In this way, in the present embodiment, the peripheral portion of the electrode assembly (30) is covered by an outer film (60) having a predetermined degree of flexibility. Therefore, even if an external force is applied to the battery cell (20) by the aforementioned pressurizing frame (14), the outer film (60) can be appropriately deformed and alleviate the external force. In addition, most of the external force can be applied to the cap (40) as described above. Therefore, the external force directly applied to the electrode assembly (30) can be minimized.

[0089] In particular, in the present embodiment, damage to the electrode assembly (30) or deterioration in the performance of the battery cell (20) due to charging and discharging can be minimized. More specifically, the electrode assembly (30) may expand or contract during the charging and discharging process, and in the present embodiment, the flexible outer film (60) can be deformed to correspond to the expansion or contraction of the electrode assembly (30). Through this, excessive force applied to a local portion of the electrode assembly (30) can be minimized, and thus damage to the electrode assembly (30) or deterioration in its performance can be prevented.

[0090] Meanwhile, the outer film (60) of the battery cell (20) according to one embodiment of the present invention may include a venting portion (64). The venting portion (64) may be a portion provided to allow gas to be discharged from the outer film (60). To this end, the venting portion (64) may be provided to be easily broken by an increase in pressure in the receiving space (A). The venting portion (64) may be provided on one side of the receiving portion (62).

[0091] In this embodiment, the venting portion (64) may include a first connecting portion (64a) connected to one edge portion (62a) of the receiving portion (62) and a second connecting portion (64b) connected to the other edge portion (62b) of the receiving portion (62).

[0092] At this time, the edge portions (62a, 62b) of the receiving portion (62) may be edges extending along the longitudinal direction of the battery cell (20) in the front-back direction (X-axis direction). The ends of one edge portion (62a) and the ends of the other edge portion (62b) may be arranged to face each other. This may be because the receiving portion (62) surrounds the electrode assembly (30) in the circumferential direction.

[0093] Meanwhile, in the present embodiment, the positions of one edge portion (62a) and the other edge portion (62b) facing each other are illustrated as being placed on the side of the battery cell (20). However, if necessary, the portions (62a, 62b) may be positioned elsewhere in the battery cell (20). For example, the portions (62a, 62b) may be positioned at the corner portion of the battery cell (20).

[0094] In this embodiment, the first coupling portion (64a) and the second coupling portion (64b) may be arranged to overlap each other. The first coupling portion (64a) and the second coupling portion (64b) may be coupled to each other. For example, the first and second coupling portions (64a, 64b) may be sealed using heat fusion, but their coupling method is not limited thereto. In this embodiment, the first and second coupling portions (64a, 64b) may extend in the front-back direction (X-axis direction) along the edge portions (62a, 62b) of the receiving portion (62).

[0095] In this way, in the outer film (60) according to the present embodiment, the receiving portion (62) is connected by a single outer film, but the venting portion (64) is formed by sealing different parts of the outer film, so that when the pressure or temperature of the receiving space (A) rises, the venting portion (64) may be broken before the receiving portion (62). As a result, the gas in the receiving space (A) may be discharged through the venting portion (64).

[0096] At this time, referring again to FIG. 2, in the present embodiment, the venting portion (64) of the battery cell (20) may be arranged to face the opening (B) of the cover frame (12). At this time, the venting portion (64) may be adjacent to the opening (B) or may be in close contact with the opening (B). This may be because the pressing frame (14) presses the battery cell (20) toward the cover frame (12).

[0097] Through this, most of the gas discharged from the venting section (64) can flow into the opening (B). Therefore, the location and direction of gas discharge can be appropriately controlled. This will be described in detail with reference to FIGS. 6 and 7.

[0098] Meanwhile, in this embodiment, the venting portion (64) is described as a portion where the edges of the outer film (60) are in contact with each other and sealed. However, the structure or shape of the venting portion (64) is not particularly limited as long as it can discharge gas before other portions of the outer film (60). For example, the venting portion (64) may be defined as a region in which a notch is formed in the outer film (60), or may be configured as a valve or plug coupled to one side of the receiving portion (62).

[0099] Hereinafter, a process for controlling the direction and position of gas discharge in a battery box according to one embodiment of the present invention is specifically described.

[0100] As illustrated in Fig. 6, when the battery cell (20) is operating normally, the receiving space (A) can be isolated from the outside of the battery cell (20). However, the pressure in the receiving space (A) of the battery cell (20) may increase due to gas generation. For example, the gas may be excessively generated from the electrode assembly (30) due to an external physical, chemical, or thermal shock. Hereinafter, such a state is referred to as an abnormal state.

[0101] In an abnormal state, the gas generated in the battery cell (20) needs to be discharged to the outside. This can be achieved by the venting portion (64) described above. More specifically, as illustrated in FIG. 7, in an abnormal state, the venting portion (64) of the battery cell (20) may be broken and the gas may be discharged.

[0102] At this time, in the present embodiment, since the venting portion (64) of the battery cell (20) is positioned to face the opening (B) of the cover frame (12), most of the gas discharged from the venting portion (64) can flow into the opening (B). The opening (B) can be connected to a part of the battery box (1). Through this, the direction and position in which gas or flame is discharged from the battery box (1) can be appropriately controlled.

[0103] At this time, since the venting part (64) is in close contact with the opening (B) in this embodiment, almost all of the gas discharged from the venting part (64) can flow into the opening (B). Therefore, in the battery box (1) according to this embodiment, the direction and position of gas or flame discharge can be controlled very effectively.

[0104] Hereinafter, a battery box according to another embodiment of the present invention will be described with reference to different drawings. Fig. 8 is an exploded perspective view of a battery box according to another embodiment of the present invention. Here, the differences between the battery box according to another embodiment of the present invention and the battery box according to the previously described embodiment will be primarily described. Meanwhile, components indicated by the same drawing numbers as those indicated in the previously described drawings can be understood as identical components performing the same function.

[0105] FIG. 8 discloses a battery box according to another embodiment of the present invention. Referring to FIG. 8, a cover frame (112) of a battery box according to another embodiment of the present invention may be positioned below a plurality of battery cells (20) stacked in the left-right direction. The cover frame (112) may support the lower portion of the battery cells (20).

[0106] At this time, the cover frame (112) of the battery box according to another embodiment of the present invention may include a first support portion (112a) and a second support portion (112b). The first support portion (112a) and the second support portion (112b) may be arranged at a predetermined distance in the front-back direction with the opening (B) therebetween.

[0107] In other words, in the present embodiment, the opening (B) may be defined as a predetermined space provided between the first support portion (112a) and the second support portion (112b). The first and second support portions (112a, 112b) may extend in the left-right direction so as to be parallel to each other. The left-right direction may be the direction in which a plurality of battery cells (20) are stacked.

[0108] At this time, in the present embodiment, the distance between the first support portion (112a) and the second support portion (112b) may be smaller than or equal to the distance between a pair of caps of the battery cell (20). This configuration may be such that the first and second support portions (112a, 112b) each support a pair of caps. In addition, the portion between the pair of caps in the battery cell (20) may be arranged to be adjacent to the opening (B). At this time, the venting portion (64) of the battery cell (20) may be arranged to face the opening (B).

[0109] Due to this, even if the pressure frame (14) presses and presses the battery cell (20) toward the cover frame (112), the outer film, which has relatively weak rigidity, is deformed to protrude toward the opening (B) and may not receive excessive force. In addition, the cap of the battery cell (20), which has relatively strong rigidity, is supported by being in contact with a pair of support members (112a, 112b), thereby being able to receive an external force by the pressure frame (14).

[0110] In particular, in this embodiment, the upper part of the battery cell (20) is in close contact with the pressure frame (14), the left and right sides are in close contact with the neighboring battery cell (20), and only the lower part provided with the venting part (64) has a certain degree of freedom by the opening (B), so that gas generated inside the battery cell (20) can be smoothly discharged through the venting part (64) to the opening (B).

[0111] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various embodiments are possible within the scope equivalent to the technical idea of ​​the present invention and the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0112] [Explanation of symbols]

[0113] 1: Battery box 10: Packaging

[0114] 12, 112: Cover frame 14: Pressurized frame

[0115] 20: Battery cell 30: Electrode assembly

[0116] 40: Cap 50: Terminal

[0117] 60: Outer film 62: Receptacle

[0118] 64: Venting section A: Reception space

[0119] B: Open mouth

Claims

1. A battery cell including an electrode assembly extending in one direction, an outer film accommodating the electrode assembly, and a cap coupled to the outer film and shielding one longitudinal side of the electrode assembly; and A frame supporting the battery cell and having an opening, The above outer film, a receiving portion surrounding the electrode assembly; and Including a venting part provided on one side of the above-mentioned receiving part, The above venting portion is a battery box arranged to face the opening.

2. In paragraph 1, The above cover frame, It comprises a pair of supports arranged in parallel with the above opening in between, A battery box, wherein the battery cell is supported by the pair of supports.

3. In paragraph 2, The above battery cells are composed of a plurality of cells and arranged in one direction, The above pair of supports are a battery box extending parallel to the above one direction.

4. In paragraph 2, The above caps are provided in pairs on each side of the electrode assembly, The above pair of supports are a battery box, each supporting a pair of caps.

5. In paragraph 1, The above caps are provided in pairs on each side of the electrode assembly, The above battery cell, It includes a pair of terminals that are electrically connected to the cathode and anode of the electrode assembly, respectively, The above pair of terminals are each connected to the above pair of caps, a battery box.

6. In paragraph 1, The above cover frame, A battery box having a plate shape on which the above battery cells can be placed.

7. In paragraph 8, A battery box, wherein the above opening includes a plurality of venting holes formed in the cover frame.

8. In paragraph 7, The above venting portion extends in one direction, The above venting hole is a battery box that extends in the longitudinal direction of the venting part.

9. In paragraph 7, The above battery cells are composed of multiple units, A battery box in which the plurality of venting holes correspond to the plurality of battery cells, respectively.

10. In paragraph 9, The above plurality of battery cells are arranged in one direction, A battery box, wherein the plurality of venting holes are arranged along the one direction.

11. In paragraph 1, The above venting portion is a battery box that is in close contact with the cover frame so as to be adjacent to the opening.

12. In paragraph 11, A battery box further comprising a pressing frame that presses the battery cell toward the cover frame.

13. In paragraph 12, The above pressurized frame is a battery box located on the opposite side of the cover frame with the battery cell therebetween.

14. In paragraph 12, The above pressurized frame is a battery box having a plate shape on one side that interfaces with the battery cell.

15. In paragraph 1, A battery box, wherein the venting portion is configured to rupture and discharge gas when the pressure in the receiving space increases.

16. In paragraph 15, A battery box, wherein the venting portion includes a sealing portion that is sealed in the longitudinal direction of the electrode assembly.

17. In paragraph 15, A battery box in which the above venting portion is designed to be broken before the receiving portion due to an increase in pressure in the receiving space.

18. In paragraph 17, The above venting part, A first connecting portion connected to one edge portion of the above-mentioned receiving portion; and A battery box, comprising a second connecting portion connected to another edge portion of the receiving portion and connected to the first connecting portion.

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