Secondary battery with enhanced safety

Abstract

The present invention relates to a secondary battery comprising: one or more battery cells; a housing unit that is provided with a first inner space to accommodate the battery cells and has a through-hole formed in a side surface thereof; a venting device that is mounted in the through-hole and discharges gas generated inside the housing unit to the outside; and a particle-blocking member detachably coupled to the outer side of a side surface of the housing unit so as to cover the venting device. The particle-blocking member includes: a blocking unit that includes a first surface facing a side surface of the housing unit, a second surface extending from the upper end of the first surface toward the side surface of the housing unit, and a pair of third surfaces extending from side ends of the first surface toward the side surface of the housing unit, and forms a second inner space; and an accommodation unit located below the blocking unit.

Description

Secondary batteries with improved safety

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0039437, filed March 22, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a secondary battery with improved safety, and more specifically, to a secondary battery with improved safety having a structure capable of suppressing fire by quickly discharging gas generated during thermal runaway of the secondary battery to a long distance while limiting the movement distance of particles.

[0003]

[0004] As technological development and demand for mobile devices increase, rechargeable secondary batteries are increasingly being used as energy sources for a variety of mobile devices. Secondary batteries are also attracting attention as an energy source for electric and hybrid electric vehicles, offering an alternative to conventional gasoline and diesel vehicles that rely on fossil fuels.

[0005] Secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0006] Meanwhile, secondary batteries possess excellent electrical properties, but under abnormal operating conditions such as overcharge, overdischarge, high-temperature exposure, and electrical short-circuiting, the components of the battery, such as active materials and electrolytes, decompose, generating heat and gas, causing the secondary battery to expand, a phenomenon known as swelling. This swelling accelerates these decomposition reactions, potentially leading to thermal runaway, which can lead to explosions and fires in the secondary battery.

[0007] Fig. 1 is a perspective view of a secondary battery according to the prior art. As illustrated in Fig. 1, the secondary battery comprises one or more battery cells (10), a housing (20) that accommodates the battery cells (10), and a safety valve (30) that discharges gas generated within the housing (20) to the outside.

[0008] Therefore, it can be expected that explosion of the secondary battery can be prevented because the high-pressure venting gas is released to the outside through the safety valve (30) when the battery cell experiences thermal runaway.

[0009] However, when a battery cell experiences thermal runaway, it generates flares, which are flames that shoot out like flashes from weak seals, spark particles, which are high-temperature particles released by the detachment of internal electrodes and the melting of aluminum current collectors, and high-temperature vent gas. These particles do not remain in their original location, but can travel to nearby battery cells, surrounding modules, or even objects equipped with secondary batteries, increasing the likelihood of a major accident.

[0010] In addition, during the discharge process, spark particles may block the passage of the safety valve (30), preventing the discharge of venting gas, etc., or accumulate in the passage, preventing the safety valve (30) from operating properly.

[0011]

[0012] (Prior art literature)

[0013] (Patent Document 1) Korean Patent Publication No. 10-2023-0098080

[0014]

[0015] In order to solve the above problems, the present invention aims to provide a secondary battery with improved safety that can prevent explosion or suppress fire by quickly discharging venting gas and particles generated inside the secondary battery to the outside.

[0016] In addition, the present invention aims to provide a secondary battery with improved safety, which can suppress fire occurrence by discharging venting gas generated inside the secondary battery to a long distance while limiting the movement distance of particles.

[0017]

[0018] As a technical means for achieving the above purpose, a secondary battery according to one embodiment of the present invention comprises: one or more battery cells (100); a housing part (200) provided with a first internal space (S1) for accommodating the battery cells (100) and having a through hole (211) formed on a side thereof; a venting device (300) mounted in the through hole (211) for discharging gas generated within the housing part (200) to the outside; And a particle blocking member (400) detachably coupled to the outer side of the housing part (200) in a shape that covers the venting device (300); wherein the particle blocking member (400) includes a first side (411) facing the side of the housing part (200), a second side (412) extending from the upper end of the first side (411) toward the side of the housing part (200), and a pair of third sides (413) extending from both ends of the first side (411) toward the side of the housing part (200), thereby forming a second internal space (S2), and a storage part (420) located at the lower end of the blocking member (410).

[0019] In addition, in the secondary battery according to one embodiment of the present invention, at least one of the first surface (411), the second surface (412), and the third surface (413) is characterized in that it is provided with a mesh plate having mesh holes formed therein.

[0020] In addition, in the secondary battery according to one embodiment of the present invention, the mesh hole is characterized in that it has a particle size smaller than the particle size discharged through the venting device (300).

[0021] In addition, in the secondary battery according to one embodiment of the present invention, the mesh hole is characterized in that its inner diameter becomes narrower as it moves toward the side of the housing portion (200).

[0022] In addition, in the secondary battery according to one embodiment of the present invention, the receiving portion (420) is characterized by including a fifth surface (422) extending from the lower end of the first surface (411) to face the side surface of the housing portion (200); a pair of sixth surfaces (423) extending from both ends of the fifth surface (422) to face the side surface of the housing portion (200); a seventh surface (424) extending from one end of the pair of sixth surfaces (423) to be parallel to the fifth surface (422); and a fourth surface (421) connecting the lower end of the fifth surface (422), the lower end of the pair of sixth surfaces (423), and the lower end of the seventh surface (424).

[0023] In addition, in the secondary battery according to one embodiment of the present invention, the storage unit (420) further includes a partition wall (426) formed between the second internal space (S2) of the blocking unit (410) and the third internal space (S3) of the storage unit (420), and a communication hole (426a) is formed in the partition wall (426) so that the second internal space (S2) and the third internal space (S3) communicate with each other.

[0024] In addition, in the secondary battery according to one embodiment of the present invention, the partition wall (426) is further characterized by having a communication passage (426b) formed in the form of a passage by extending a portion of the communication hole (426a).

[0025] In addition, in the secondary battery according to one embodiment of the present invention, the width of the fifth surface (422) is provided to exceed the width of the first surface (411), and the receiving portion (420) is characterized in that it further includes an eighth surface (425) extending from the lower end of the third surface (413) along the upper end of the fifth surface (422).

[0026] In addition, in the secondary battery according to one embodiment of the present invention, the storage unit (420) is characterized in that it is slidably coupled with the blocking unit (410).

[0027] In addition, in the secondary battery according to one embodiment of the present invention, it is characterized in that at least one of the first surface (411), the second surface (412), the third surface (413), and the fourth surface (421) further includes a connecting member (430) that extends from one end and is provided so that the particle blocking member (400) can be coupled to the side surface of the housing portion (200).

[0028] In addition, in a secondary battery according to one embodiment of the present invention, a first fastening hole (212) is formed on the side of the housing portion (200), and a second fastening hole (431) communicating with the first fastening hole (212) is formed in the connecting member (430).

[0029] In addition, in a secondary battery according to one embodiment of the present invention, it is characterized in that a fastening member (500) is further included so as to be fastened by penetrating both the first fastening hole (212) and the second fastening hole (431) while the first fastening hole (212) and the second fastening hole (431) are overlapped.

[0030] In addition, in the secondary battery according to one embodiment of the present invention, the receiving portion (420) is a fourth surface (421) connecting the lower portion of the first surface (411) and the lower portion of the pair of third surfaces (413), and the fourth surface (421) is characterized by having a plate shape in which no mesh hole is formed.

[0031] In addition, in the secondary battery according to one embodiment of the present invention, the venting device (300) is characterized as a safety valve that opens when the pressure of the first internal space (S1) rises above a preset pressure and closes when the pressure of the first internal space (S1) falls below a preset pressure.

[0032] In addition, in the secondary battery according to one embodiment of the present invention, the housing part (200) is characterized in that it is a module housing part or a pack housing part.

[0033]

[0034] As described above, according to the secondary battery with improved safety according to the present invention, a particle blocking member equipped with a mesh hole is externally attached to the housing portion in a shape that covers the venting device, thereby quickly discharging venting gas and particles generated inside the housing portion to the outside, thereby preventing explosion or suppressing fire.

[0035] In addition, according to the secondary battery with improved safety according to the present invention, mesh holes having a particle diameter smaller than that of the particle particles are formed in the particle blocking member, so that the venting gas generated inside the secondary battery is discharged to a long distance, but the movement distance of the particles is limited, thereby suppressing the occurrence of a fire.

[0036] In addition, according to the secondary battery with improved safety according to the present invention, the particle blocking member is slidably coupled to a storage portion located at the lower side of the blocking portion, thereby storing the blocked particles through the blocking portion and easily recovering the stored particles.

[0037]

[0038] Figure 1 is a perspective view of a secondary battery according to conventional technology.

[0039] Figure 2 is an exploded perspective view of a secondary battery according to the first embodiment of the present invention.

[0040] FIG. 3 is a perspective view showing a venting device mounted on a housing portion of a secondary battery according to the first embodiment of the present invention.

[0041] FIG. 4 is a side view showing the appearance of a venting device mounted on a secondary battery according to the first embodiment of the present invention before and after opening.

[0042] Figure 5 is an enlarged perspective view of area A shown in Figure 2.

[0043] FIG. 6 is a drawing showing a particle blocking member according to the first embodiment of the present invention coupled to a housing portion as a fastening member.

[0044] Figure 7 is a perspective view of a particle blocking member mounted on a secondary battery according to the first embodiment of the present invention, viewed from the inside.

[0045] Fig. 8 is a cross-sectional view taken vertically along area B of the particle blocking member illustrated in Fig. 7.

[0046] FIG. 9 is a perspective view of a particle blocking member according to a second embodiment of the present invention viewed from the inside.

[0047] Fig. 10 is a perspective view of a particle blocking member according to a third embodiment of the present invention viewed from the inside.

[0048] Fig. 11 is a perspective view of a particle blocking member according to a fourth embodiment of the present invention viewed from the inside.

[0049] Fig. 12 is a drawing of a particle blocking member according to a fourth embodiment of the present invention, viewed from the inside.

[0050] Fig. 13 is a drawing of a particle blocking member according to a fifth embodiment of the present invention, viewed from the inside.

[0051] Fig. 14 is a drawing of a particle blocking member according to a sixth embodiment of the present invention, viewed from the inside.

[0052] Fig. 15 is a perspective view of a particle blocking member according to a seventh embodiment of the present invention viewed from the inside.

[0053] Fig. 16 is a drawing of a particle blocking member according to the seventh embodiment of the present invention, viewed from the inside.

[0054] Fig. 17 is a drawing of a particle blocking member according to the eighth embodiment of the present invention, viewed from the inside.

[0055] Fig. 18 is a drawing of a particle blocking member according to the ninth embodiment of the present invention, viewed from the inside.

[0056] Fig. 19 is a perspective view showing the particle blocking member according to the 10th embodiment of the present invention before being coupled to the housing.

[0057] Fig. 20 is a perspective view showing a particle blocking member according to the tenth embodiment of the present invention coupled to a housing portion.

[0058] FIG. 21 is a drawing showing a particle blocking member according to the 10th embodiment of the present invention coupled to a housing portion.

[0059]

[0060] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0061] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0062]

[0063] Hereinafter, a secondary battery with improved safety according to the present invention will be described.

[0064] FIG. 2 is an exploded perspective view of a secondary battery according to a first embodiment of the present invention, FIG. 3 is a perspective view showing a venting device mounted on a housing portion of a secondary battery according to a first embodiment of the present invention, and FIG. 4 is a side view showing a venting device mounted on a secondary battery according to a first embodiment of the present invention before and after opening.

[0065] Referring to FIGS. 2 to 4, a secondary battery according to the present invention includes a battery cell (100), a housing portion (200), a venting device (300), and a particle blocking member (400).

[0066] First, one or more battery cells (100) may be provided. The battery cell (100) may be a pouch-type secondary battery including an electrode assembly, an electrode lead, and a battery case.

[0067] The electrode assembly may be formed of, but is not limited to, a jelly-roll type electrode assembly having a structure in which a separator is interposed between long sheet-shaped cathodes and anodes and then rolled up, a stack type electrode assembly having unit cells in which rectangular cathodes and anodes 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, or a lamination-stack type electrode assembly in which the unit cells are stacked with a separator interposed between them and attached to each other.

[0068] The positive electrode is composed of a positive electrode current collector and a positive electrode active material applied to the upper and lower surfaces of the positive electrode current collector. A conductive material and a binder may be mixed with the positive electrode active material, and a filler may be further added as needed.

[0069] The negative electrode is composed of a negative electrode current collector and a negative electrode active material applied to the lower and upper surfaces of the negative electrode current collector. A conductive material and a binder may be additionally mixed into the negative electrode active material and coated on the negative electrode current collector.

[0070] The separator prevents shorting between the aforementioned negative electrode and positive electrode and only allows the movement of lithium ions. The material of the separator is preferably one selected from among polyethylene, polypropylene, polyethylene / polypropylene double layer, polyethylene / polypropylene / polyethylene triple layer, polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0071] The battery case that houses the electrode assembly forms a housing using a laminate sheet composed of an outer covering layer, a metal layer, and an inner covering layer.

[0072] Since the inner covering layer is in direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and in order to seal it from the outside, the sealing area where the inner layers are thermally bonded must have excellent thermal bonding strength.

[0073] Materials for such inner covering layers may be selected from, but are not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and good sealing properties, polyurethane resins, and polyimide resins, and polypropylene, which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and excellent chemical resistance, is most preferable.

[0074] The metal layer in contact with the inner covering layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a preferred material for this metal layer is an aluminum film that is lightweight and has excellent formability.

[0075] And the other side of the metal layer is provided with an outer covering 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, and examples thereof include, but are not limited to, nylon or polyethylene terephthalate.

[0076] Meanwhile, the housing part (200) may be provided with a first internal space (S1) to accommodate the battery cell (100). The housing part (200) may include a housing body (210) having an open upper portion and a first internal space (S1), and a housing cover (220) positioned on the open upper portion of the housing body (210).

[0077] Here, the housing portion (200) may be provided as a module housing portion or a pack housing portion. For example, when the housing portion (200) is a module housing portion, the secondary battery according to the present invention may be a battery module. In addition, as another example, when the housing portion (200) is a pack housing portion, the secondary battery according to the present invention may be a battery pack.

[0078] The housing body (210) and the housing cover (220) may be made of a lightweight plastic material with a certain rigidity, and may be made of a material that protects the components stored inside from external impact and foreign substances.

[0079] In addition, one or more through holes (211) may be formed on the side of the housing body (210), and the through holes (211) may be holes provided so that the first internal space (S1) of the housing body (210) and the external space communicate with each other.

[0080] The venting device (300) is mounted in the through hole (211) and can discharge gas generated inside the housing part (200) to the outside.

[0081] For example, a fastening hole (not shown) may be formed near an area forming a through hole (211) on the side of the housing body (210), and a venting device (300) may be coupled to the housing body (210) through the fastening hole (not shown). Of course, as long as the venting device (300) can be detachably fastened to the through hole (211), the coupling means is not particularly limited.

[0082] The venting device (300) may be provided with a safety valve that opens when the pressure of the first internal space (S1) rises above a preset pressure and closes when the pressure of the first internal space (S1) falls below a preset pressure.

[0083] In detail, the venting device (300) may include a base member (310) in which a passageway (311) is formed, an opening / closing member (320) that is selectively attached to the base member (310) to open / close the passageway (311), and an elastic member (330) that optionally provides elasticity to the opening / closing member (320).

[0084] In this venting device (300), when the pressure of the first internal space (S1) rises above the elastic force of the elastic member (330), the opening / closing part (320) can be separated from the base member (310) and the passageway (311) can be opened. In addition, in the venting device (300), when the pressure of the first internal space (S1) falls below the elastic force of the elastic member (330), the opening / closing part (320) can be brought into close contact with the base member (310) and the passageway (311) can be sealed.

[0085] That is, whether the venting device (300) is opened or closed is determined by the pressure of the first internal space (S1), and when the pressure of the first internal space (S1) rises above a preset pressure, the passage (311) of the venting device (300) is opened so that the venting gas generated in the first internal space (S1) can be discharged to the outside.

[0086] This venting device (300) may be equipped with a safety valve that is obvious to ordinary technicians, but is not limited thereto and may be equipped with various devices that can discharge gas generated inside the housing portion (200) to the outside, so a more detailed description will be omitted.

[0087]

[0088] Fig. 5 is an enlarged perspective view of area A shown in Fig. 2, and Fig. 6 is a drawing showing a particle blocking member according to the first embodiment of the present invention coupled to a housing portion using a fastening member. Also, Fig. 7 is a perspective view of a particle blocking member mounted on a secondary battery according to the first embodiment of the present invention as viewed from the inside, and Fig. 8 is a cross-sectional view taken vertically along area B of the particle blocking member illustrated in Fig. 7.

[0089] When the passageway (311) of the venting device (300) is opened, not only the venting gas but also a large number of fire-causing particles are discharged together. The particle blocking member is configured to block particles discharged to the outside via the passageway (311) from traveling beyond a certain distance.

[0090] The particle blocking member (400) performing the aforementioned function may be configured as a blocking member (410) and a receiving member (420) made of a metal material or a fire-resistant material, and may cover the outside of the venting device (300).

[0091] First, the blocking portion (410) may form a second internal space (S2) including a first surface (411), a second surface (412), and a third surface (413). More specifically, the first surface (411) may be a front surface (11 o'clock direction in FIG. 7) facing the side surface of the housing body (210), the second surface (412) may be an upper surface (12 o'clock direction in FIG. 7) extending from the upper end of the first surface (411) toward the side surface of the housing body (210), and a pair of third surfaces (413) may be a pair of side surfaces (2 o'clock-8 o'clock direction in FIG. 7) extending from the side end of the first surface (411) toward the side surface of the housing body (210).

[0092] Here, the first surface (411) may be provided as a mesh plate in which a first mesh hole (411a) is formed.

[0093] The first mesh hole (411a) may be provided to have a particle size smaller than the particle size discharged through the venting device (300). For example, assuming that the particle size is 0.45 mm or less, the first mesh hole (411a) may be formed to have a particle size less than 0.45 mm so that the venting gas is discharged through the first mesh hole (411a), but the particles are not discharged.

[0094] Additionally, the first mesh hole (411a) may be formed so that its inner diameter becomes narrower as it approaches the side of the housing portion (200).

[0095] Even though the size of the first mesh hole (411a) is smaller than the particle size, the particle is quickly released to the outside together with the venting gas, so the particle collides with the first surface (411), and in this process, it can pass through the first mesh hole (411a) or block the first mesh hole (411a).

[0096] However, when the inner diameter of the first mesh hole (411a) is formed to become narrower toward the side of the housing portion (200), the blocking effect of the particles and the occlusion of the first mesh hole (411a) can be reduced.

[0097] The blocking portion (410) is provided with a mesh plate having a first mesh hole (411a) formed on the first side (411), while the second side (412) and the third side (413) are provided with plates without mesh holes formed, and the lower part (6 o'clock direction in Fig. 7) may be provided in an open shape.

[0098] Meanwhile, the storage section (420) may be a fourth surface (421) located at the bottom of the blocking section (410). The fourth surface (421) may be a lower surface (6 o'clock direction in Fig. 7) connecting the lower portion of the first surface (411) of the blocking section (410) and the lower portion of a pair of third surfaces (413).

[0099] At this time, the fourth side (421) may be provided in a plate shape in which no mesh hole is formed.

[0100] As a result, particles (e.g., spark particles) discharged together with the venting gas can be blocked by the first surface (411), the second surface (412), and the third surface (413) constituting the particle blocking member (400), and then stored in the storage portion (420) provided on the lower side of the blocking portion (410).

[0101] When a battery cell experiences thermal runaway, spark particles, which are particles with high temperatures and sparks originating from the electrode detachment and the melting of the aluminum current collector, along with high-temperature vent gas, are ejected through weak seals.

[0102] However, as in the present invention, when a particle blocking member (400) is provided, particles are prevented from moving far by the blocking member (410) and are stored in the storage member (420), so that fire can be prevented from occurring in the surrounding secondary battery or an object equipped with a secondary battery.

[0103] Meanwhile, the particle blocking member (400) may include a connecting member (430) that extends from one end of at least one of the first side (411), the second side (412), the third side (413), and the fourth side (421) so that the particle blocking member (400) can be attached and detached to the side of the housing portion (200).

[0104] For example, the connecting member (430) may extend from one end of one or more of the first surface (411), the second surface (412), the third surface (413), and the fourth surface (421) to face the side surface of the housing portion (200). That is, the connecting member (430) may be provided parallel to the side surface of the housing portion (200).

[0105] For example, the connecting member (430) may be provided on both sides (3 o'clock to 9 o'clock direction based on FIG. 6) of the particle blocking member (400) by extending outward from one end of the third surface (413) to face the side of the housing portion (200). In addition, as another example, the connecting member (430) may be provided on the upper side (12 o'clock direction based on FIG. 6) and both sides (3 o'clock to 9 o'clock direction based on FIG. 6) of the particle blocking member (400) by extending outward from one end of the second surface (412) and the third surface (413) to face the side of the housing portion (200).

[0106] In addition, as another example, the connecting member (430) may be provided on the upper (12 o'clock direction based on FIG. 6), both sides (3-9 o'clock direction based on FIG. 6), and lower (6 o'clock direction based on FIG. 6) of the particle blocking member (400) by extending outwardly from one end of the second side (412), the third side (413), and the fourth side (421) to face the side of the housing portion (200).

[0107] In addition, a first fastening hole (212) may be formed on the side of the housing body (210), and a second fastening hole (431) communicating with the first fastening hole (212) may be formed on the connecting member (430) (see FIG. 5).

[0108] The first fastening hole (212) may be formed in a peripheral area of ​​the through hole (211) in which the venting device (300) is mounted, and more specifically, the second fastening hole (431) may be formed in a position corresponding to the position of the first fastening hole (212) so as to be in communication with the first fastening hole (212).

[0109] At this time, the secondary battery according to the present invention may further include a fastening member (500), and this fastening member (500) may be provided so as to be fastened by penetrating both the first fastening hole (212) and the second fastening hole (431) in a state where the first fastening hole (212) and the second fastening hole (431) overlap each other.

[0110] For example, female threads may be formed on the inner surface of the first fastening hole (212) and the second fastening hole (431), and male threads may be formed on the outer surface of the fastening member (500), but the present invention is not limited thereto.

[0111]

[0112] FIG. 9 is a perspective view of a particle blocking member according to a second embodiment of the present invention viewed from the inside.

[0113] The particle blocking member (400) according to the second embodiment is the same as the first embodiment in terms of the remaining configuration, with only the formation locations of the mesh holes being different. The particle blocking member according to the second embodiment may be provided as a mesh plate in which a first mesh hole (411a), a second mesh hole (412a), and a third mesh hole (413a) are formed on the first surface (411), the second surface (412), and the third surface (413), respectively.

[0114] In this case, when the particles are discharged to the outside from the first internal space (S1) due to the pressure of the first internal space (S1), they may be blocked by the first surface (411), the second surface (412), and the third surface (413) and may be moved to the storage unit (420) without being discharged to the outside.

[0115] In addition, a first mesh hole (411a) is formed on the first surface (411), a second mesh hole (412a) is formed on the second surface (412), and a third mesh hole (413a) is formed on the third surface (413), so that the venting gas discharged from the first internal space (S1) can be discharged to the outside more easily through the first mesh hole (411a), the second mesh hole (412a), and the third mesh hole (413a), and the venting gas can be discharged while being dispersed in various directions.

[0116]

[0117] Fig. 10 is a perspective view of a particle blocking member according to a third embodiment of the present invention viewed from the inside.

[0118] The particle blocking member (400) according to the third embodiment is the same as the first embodiment in terms of the remaining configuration, with only the formation location of the mesh holes being different. The particle blocking member according to the third embodiment may be provided with a first surface (411) as a plate without mesh holes, and a second surface (412) and a third surface (413) as mesh plates in which a second mesh hole (412a) and a third mesh hole (413a) are formed, respectively.

[0119] In this case, when the particles are discharged to the outside from the first internal space (S1) due to the pressure of the first internal space (S1), they may be blocked by the first surface (411), the second surface (412), and the third surface (413) and may be moved to the storage unit (420) without being discharged to the outside.

[0120] In addition, a second mesh hole (412a) is formed on the second surface (412), and a third mesh hole (413a) is formed on the third surface (413), so that the venting gas discharged from the first internal space (S1) can be easily discharged to the outside through the second mesh hole (412a) and the third mesh hole (413a).

[0121]

[0122] FIG. 11 is a perspective view of a particle blocking member according to a fourth embodiment of the present invention as viewed from the inside, and FIG. 12 is a view of a particle blocking member according to a fourth embodiment of the present invention as viewed from the inside.

[0123] The particle blocking member (400) according to the fourth embodiment is different only in the receiving portion (420), and the remaining configuration is identical to that of the first embodiment. The receiving portion (420) of the particle blocking member according to the fourth embodiment may be provided to include a fourth surface (421), a fifth surface (422), a sixth surface (423), and a seventh surface (424).

[0124] To explain in more detail, first, the fifth side (422) may be a front surface (11 o'clock direction based on FIG. 11) that extends from the lower end of the first side (411) of the blocking portion (410) to face the side surface of the housing body (210), and the sixth side (423) may be a pair of side surfaces (2 o'clock-8 o'clock direction based on FIG. 11) that extend from both ends of the fifth side (422) to face the side surface of the housing body (210). In addition, the seventh surface (424) may be a rear surface (5 o'clock direction based on FIG. 11) extending parallel to the fifth surface (422) from one end (5 o'clock direction based on FIG. 11) of a pair of sixth surfaces (423), and the fourth surface (421) may be a lower surface (6 o'clock direction based on FIG. 11) connecting the lower end of the fifth surface (422), the lower end of the pair of sixth surfaces (423), and the lower end of the seventh surface (424).

[0125] This storage unit (420) can form a third internal space (S3) through the fourth side (421), the fifth side (422), the sixth side (423), and the seventh side (424), and the third internal space (S3) can be provided to communicate with the second internal space (S2) of the blocking unit (410).

[0126] The storage unit (420) may be provided in a plate shape without a mesh hole formed therein, and may be provided at the bottom of the blocking unit (410) to store particles (e.g., spark particles) blocked by the blocking unit (410) in the third internal space (S3).

[0127] In other words, when the particles are discharged to the outside from the first internal space (S2) due to the pressure of the first internal space (S1), they are blocked by the blocking part (410) and cannot be discharged to the outside, but can move to the third internal space (S3) of the receiving part (420).

[0128] In addition, the storage unit (420) may be slidably coupled with the blocking unit (410). For example, a protrusion (413b) may be formed on the lower end of a pair of third faces (413) of the blocking unit (410) so as to protrude downward (6 o'clock direction as shown in FIG. 12), and a first recessed portion (423a) may be formed on the upper end of a pair of sixth faces (423) of the storage unit (420) so as to be recessed downward (6 o'clock direction as shown in FIG. 12).

[0129] For example, in more detail, the protrusion (413b) may be provided in a form in which the width becomes wider as it goes downwards, with the lower end having the widest width, and the first recessed portion (423a) may be provided in a form in which the inlet end has the narrowest width corresponding to the shape of the protrusion (413b). At this time, the first recessed portion (423a) may be formed in a groove shape larger than the protrusion (413b) so that the protrusion (413b) can be slidably inserted.

[0130] Of course, it is also possible for a first depression to be formed on the lower portion of a pair of third faces (413) and a protrusion to be formed on the upper portion of a pair of sixth faces (423).

[0131] As a result, particles discharged together with the venting gas can be stored in a storage unit (420) provided on the lower side of the storage unit (410) after being blocked by the blocking unit (410), and the storage unit (420) can be easily removed by releasing the coupling from the blocking unit (410) in a sliding manner to the third internal space (S3) of the storage unit (420).

[0132]

[0133] Fig. 13 is a drawing of a particle blocking member according to a fifth embodiment of the present invention, viewed from the inside.

[0134] The particle blocking member (400) according to the fifth embodiment is the same as the fourth embodiment in terms of the remaining configuration, except that it further includes a partition wall. The particle blocking member according to the fifth embodiment may be provided such that the receiving portion (420) includes a fourth surface (421), a fifth surface (422), a sixth surface (423), a seventh surface (424), and a partition wall (426).

[0135] A partition wall (426) may be formed between the second internal space (S2) of the blocking portion (410) and the third internal space (S3) of the receiving portion (420). This partition wall (426) may be provided to connect the vicinity of the upper end of the fifth surface (422) of the receiving portion (420), the vicinity of the upper end of a pair of sixth surfaces (423), and the vicinity of the upper end of the seventh surface (424).

[0136] In addition, a communication hole (426a) may be formed in the bulkhead (426) so that the second internal space (S2) and the third internal space (S3) communicate with each other. For example, the communication hole (426a) may be formed in the center of the bulkhead (426).

[0137] Accordingly, particles blocked by the blocking portion (410) are moved to the third internal space (S3) of the storage portion (420) through the communication hole (426a), and even if vent gas is released from the first internal space (S1), particles stored in the third internal space (S1) can be minimized from being moved back to the second internal space (S2) by the partition wall (426).

[0138] In addition, the bulkhead (426) may be provided such that when extending from the vicinity of the upper end of the fifth side (422), the vicinity of the upper end of a pair of sixth sides (423), and the vicinity of the upper end of the seventh side (424) toward the central portion (inner side), the central portion may be positioned lower than the vicinity of each of the upper ends. In other words, the bulkhead (426) may be provided as an inclined surface that slopes downward from each outer end toward the central portion.

[0139] In this case, particles that are not discharged to the outside by the blocking section (410) can more easily move along the slope of the partition wall (426) and through the communication hole (426a) to the third internal space (S3) of the receiving section (420), and even if vent gas is discharged from the first internal space (S1), the particles can be prevented from moving to the second internal space (S2).

[0140]

[0141] Fig. 14 is a drawing of a particle blocking member according to a sixth embodiment of the present invention, viewed from the inside.

[0142] The particle blocking member (400) according to the sixth embodiment is the same as the fifth embodiment in terms of the remaining configuration, with only the shape of the partition wall being different. The particle blocking member according to the sixth embodiment may be provided such that the receiving portion (420) includes a fourth surface (421), a fifth surface (422), a sixth surface (423), a seventh surface (424), and a partition wall (426).

[0143] A communication passage (426b) may be provided in the bulkhead (426) to allow the second internal space (S2) and the third internal space (S3) to communicate with each other. The communication passage (426b) may be formed in the form of a passage by partially extending the communication hole (426a) downward.

[0144] The communication path (426b) can be formed in the center of the bulkhead (426), and particles that are not discharged to the outside by the blocking part (410) can move along the slope of the bulkhead (426) and through the communication path (426b) to the third internal space (S3) of the storage part (420).

[0145] In addition, the communication path (426b) is a communication hole (426a) formed in the form of a passage by extending downward from the center of the bulkhead (426), so that even if vent gas is emitted from the first internal space (S1), particles can be more reliably blocked from moving to the second internal space (S2).

[0146]

[0147] FIG. 15 is a perspective view of a particle blocking member according to a seventh embodiment of the present invention as viewed from the inside, and FIG. 16 is a view of a particle blocking member according to a seventh embodiment of the present invention as viewed from the inside.

[0148] The particle blocking member (400) according to the seventh embodiment is the same as the fourth embodiment in terms of the remaining configuration, with only the shape of the receiving portion (420) being different. The particle blocking member (400) according to the seventh embodiment may be provided such that the receiving portion (420) includes a fourth surface (421), a fifth surface (422), a sixth surface (423), a seventh surface (424), and an eighth surface (425).

[0149] The particle blocking member (400) according to the seventh embodiment may be provided such that the width of the fifth side (422) and the seventh side (424) of the receiving portion (420) (3 o'clock to 9 o'clock direction based on FIG. 16) exceeds the width of the first side (411) (3 o'clock to 9 o'clock direction based on FIG. 16). In other words, the width of the receiving portion (420) may be provided to be longer than the width of the blocking portion (410).

[0150] Accordingly, the storage unit (420) may include an eighth surface (425) extending from the lower portion of the third surface (413) along the upper portion of the fifth surface (422), the upper portion of the sixth surface (423), and the upper portion of the seventh surface (424), and the eighth surface (425) may be the upper surface (12 o'clock direction in FIG. 15) of the storage unit (420).

[0151] At this time, the storage section (420) may be provided with a second recessed section (425a) formed by being partially recessed downward at the upper end of the eighth surface (425) so as to be slidably coupled with the blocking section (410).

[0152] The second recessed portion (425a) can be formed at a position corresponding to the position of the protrusion (413b) formed at the lower end of the third surface (413) so as to enable sliding engagement with the protrusion (413b).

[0153] For example, the protrusion (413b) may be provided in a form in which the width becomes wider as it goes downwards and the lower end has the widest width, and the second recessed portion (425a) may be provided in a form in which the inlet end has the narrowest width corresponding to the shape of the protrusion (413b). At this time, the second recessed portion (425a) may be formed in a groove shape larger than the protrusion (413b) so that the protrusion (413b) can be slidably inserted.

[0154] Of course, it is also possible for a first depression to be formed on the lower portion of a pair of third faces (413) and a protrusion to be formed on the upper portion of a pair of fifth faces (422).

[0155] In addition, the storage unit (420) is provided with a width greater than the width of the blocking unit (410), so that a larger amount of particles can be stored.

[0156] As a result, particles discharged together with the venting gas can be stored in a storage unit (420) provided on the lower side of the storage unit (410) after being blocked by the blocking unit (410), and the storage unit (420) can be detached from the blocking unit (410) in a sliding manner to remove particles stored in the third internal space (S3) of the storage unit (420).

[0157]

[0158] Fig. 17 is a drawing of a particle blocking member according to the eighth embodiment of the present invention, viewed from the inside.

[0159] The particle blocking member (400) according to the eighth embodiment is identical to the seventh embodiment in terms of the remaining configuration, except that it further includes a partition wall. The receiving portion (420) of the particle blocking member according to the seventh embodiment may be provided to include a fourth surface (421), a fifth surface (422), a sixth surface (423), a seventh surface (424), an eighth surface (425), and a partition wall (426).

[0160] As described above, the bulkhead (426) can be formed between the second internal space (S2) of the blocking portion (410) and the third internal space (S3) of the storage portion (420), and a communication hole (426a) can be formed so that the second internal space (S2) and the third internal space (S3) communicate with each other.

[0161] Additionally, the bulkhead (426) may be provided with a slope that slopes downward from each outer end toward the center.

[0162] In this case, particles that are not discharged to the outside by the blocking section (410) can move along the slope of the partition wall (426) and through the communication hole (426a) to the third internal space (S3) of the receiving section (420), and when the particles are scattered by the vent gas discharged from the first internal space (S1), the particles can be prevented from moving to the second internal space (S2).

[0163]

[0164] Fig. 18 is a drawing of a particle blocking member according to the ninth embodiment of the present invention, viewed from the inside.

[0165] The particle blocking member (400) according to the ninth embodiment is the same as the eighth embodiment in terms of the remaining configuration, with only the shape of the partition wall being different. The particle blocking member according to the eighth embodiment may be provided such that the receiving portion (420) includes a fourth surface (421), a fifth surface (422), a sixth surface (423), a seventh surface (424), an eighth surface (425), and a partition wall (426).

[0166] The bulkhead (426) may be provided with a communication passage (426b) to allow the second internal space (S2) and the third internal space (S3) to communicate with each other, and this communication passage (426b) may be formed in the form of a passage by extending a portion of the communication hole (426a) downward.

[0167] The communication path (426b) can be formed in the center of the bulkhead (426), and particles that are not discharged to the outside by the blocking part (410) can move along the slope of the bulkhead (426) and through the communication path (426b) to the third internal space (S3) of the storage part (420).

[0168] In addition, the communication path (426b) is a communication hole (426a) formed in the form of a passage by extending downward from the center of the bulkhead (426), and can more reliably prevent particles from moving to the second internal space (S2) when particles are scattered by the vent gas discharged from the first internal space (S1).

[0169]

[0170] FIG. 19 is a perspective view showing a particle blocking member according to the 10th embodiment of the present invention before being coupled to a housing part, FIG. 20 is a perspective view showing a particle blocking member according to the 10th embodiment of the present invention being coupled to a housing part, and FIG. 21 is a drawing showing a particle blocking member according to the 10th embodiment of the present invention being coupled to a housing part.

[0171] The particle blocking member (400) according to the 10th embodiment is the same as the first embodiment in terms of the remaining configuration, except that the detachable structure with respect to the housing body (210) is different.

[0172] A pair of guide parts (213) spaced apart at a certain interval may be provided on the side of the housing body (210) so that a connecting member (430) can be slidably inserted. When the guide parts (213) are provided on the side of the housing body (210), the particle blocking member (400) can be slidably inserted into the guide parts (213) and connected to the housing body (210).

[0173] This guide part (213) can be provided in the peripheral area of ​​the through hole (211) in which the venting device (300) is mounted.

[0174] For example, the guide portion (213) may be provided on both sides of the through hole (211) so that an extension member (430) extending from one end of the third surface (413) can be slidably inserted.

[0175] In addition, for example, the guide portion (213) may be provided in a state in which the upper side (12 o'clock direction based on FIG. 19) is open so that the extension member (430) can be slidably inserted from the upper side to the lower side, but the lower side (6 o'clock direction based on FIG. 19) is closed so that the extension member (430) can be secured. As another example, the guide portion (213) may be provided in a state in which the upper and lower sides are open, but formed so that the extension member (430) can be slidably inserted by forced pressing.

[0176] In addition, as described above, a first fastening hole (212) may be formed in the guide portion (213), and a second fastening hole (431) may also be formed in the connecting member (430). In this case, the particle blocking member (400) may be first coupled by sliding the connecting member (430) into the guide portion (213), and second coupled by fastening the connecting member (500) by penetrating both the first fastening hole (212) and the second fastening hole (431).

[0177] Although the 10th embodiment of FIGS. 19 to 21 has described the particle blocking member according to the first embodiment, that is, the particle blocking member having the first mesh hole on the first surface and the receiving portion as the fourth surface, as an example, it is obvious that the particle blocking member according to the 2nd to 9th embodiments can also be combined with the housing body in the same manner as the 10th embodiment.

[0178] In addition, the particle blocking member according to the fourth to ninth embodiments can be combined with the housing body in a state where the storage portion is combined with the blocking portion, but as another example, the blocking portion can be first combined with the housing body, and then the storage portion can be slidably combined with the blocking portion combined with the housing body.

[0179] Also, although the storage section according to the fourth to ninth embodiments has been described as an example of a blocking section according to the first embodiment, that is, a section having a first mesh hole on the first surface, it is obvious that the same can be applied to blocking sections according to the second and third embodiments.

[0180]

[0181] As described above, specific parts of the present invention have been described in detail. To those skilled in the art, such specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present invention, and it is natural that such changes and modifications fall within the scope of the appended patent claims.

[0182]

[0183] (Explanation of symbols)

[0184] 100: Battery cell

[0185] 200: Housing Department

[0186] 210: Housing body

[0187] 211: Through hole 212: First fastening hole

[0188] 213: Guide Department

[0189] 220: Housing cover

[0190] 300: Venting Device

[0191] 310: Base member 311: Passageway

[0192] 320: Opening and closing part

[0193] 330: Elastic member

[0194] 400: No particle blocking

[0195] 410: Blocking section

[0196] 411: First side 411a: First mesh hole

[0197] 412: Second side 412a: Second mesh hole

[0198] 413: Page 3

[0199] 413a: Third mesh hole 413b: Protrusion

[0200] 420: Storage compartment

[0201] 421: Page 4

[0202] 422: Page 5

[0203] 423: 6th side 423a: 1st depression

[0204] 424: Page 7

[0205] 425: 8th side 425a: 2nd depression

[0206] 426: Bulkhead

[0207] 426a: Chimney hole 426b: Chimney passage

[0208] 430: connecting member 431: second fastening hole

[0209] 500: Fastening member

[0210] S1: First internal space

[0211] S2: Second inner space

[0212] S3: Third inner space

Claims

1. One or more battery cells; A housing part having a first internal space provided to accommodate the above-mentioned battery cell and a through hole formed on the side; A venting device mounted in the through hole to discharge gas generated inside the housing to the outside; and A particle blocking member detachably coupled to the outer side of the housing portion in a shape that covers the venting device; The above particle blocking member is, A blocking portion forming a second internal space, including a first surface facing the side surface of the housing portion, a second surface extending from the upper end of the first surface toward the side surface of the housing portion, and a pair of third surfaces extending from both ends of the first surface toward the side surface of the housing portion, and A secondary battery characterized by including a storage portion located at the bottom of the above-mentioned blocking portion.

2. In paragraph 1, A secondary battery characterized in that at least one of the first side, the second side, and the third side is provided with a mesh plate having mesh holes formed therein.

3. In paragraph 2, A secondary battery characterized in that the mesh hole is provided to have a particle size smaller than the particle size discharged through the venting device.

4. In paragraph 3, A secondary battery characterized in that the mesh hole is formed such that the inner diameter becomes narrower as it moves toward the side of the housing portion.

5. In paragraph 2, A secondary battery characterized in that the storage portion includes a fifth surface extending from the lower end of the first surface to face the side surface of the housing portion; a pair of sixth surfaces extending from both ends of the fifth surface to face the side surface of the housing portion; a seventh surface extending from one end of the pair of sixth surfaces to be parallel to the fifth surface; and a fourth surface connecting the lower end of the fifth surface, the lower end of the pair of sixth surfaces, and the lower end of the seventh surface.

6. In paragraph 5, The storage unit further includes a partition formed between the second internal space of the blocking unit and the third internal space of the storage unit, A secondary battery characterized in that a communication hole is formed in the above bulkhead so that the second internal space and the third internal space communicate with each other.

7. In paragraph 6, A secondary battery characterized in that the above bulkhead further has a communication passage formed in the form of a passage by extending a portion of the communication hole.

8. In paragraph 6, The width of the fifth side is provided to exceed the width of the first side, A battery pack characterized in that the storage portion further includes an eighth surface extending from the lower portion of the third surface along the upper portion of the fifth surface.

9. In paragraph 6, A battery pack characterized in that the storage portion is slidably connected to the blocking portion.

10. In paragraph 2, A secondary battery characterized in that it further includes a connecting member extending from one end of at least one of the first side, the second side, the third side, and the fourth side so that the particle blocking member can be coupled to the side surface of the housing portion.

11. In paragraph 10, A first fastening hole is formed on the side of the above housing portion, A secondary battery characterized in that a second fastening hole communicating with the first fastening hole is formed in the above connecting member.

12. In paragraph 11, A secondary battery characterized in that it further includes a fastening member that penetrates both the first fastening hole and the second fastening hole to fasten them while the first fastening hole and the second fastening hole are overlapped.

13. In paragraph 2, A secondary battery characterized in that the storage portion is a fourth surface connecting the lower portion of the first surface and the lower portion of the pair of third surfaces, and the fourth surface is a plate shape in which no mesh hole is formed.

14. In paragraph 2, A secondary battery characterized in that the venting device is a safety valve that opens when the pressure of the first internal space rises above a preset pressure and closes when the pressure of the first internal space falls below a preset pressure.

15. In paragraph 2, A secondary battery characterized in that the housing portion is a module housing portion or a pack housing portion.

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