Battery cell

Abstract

The present disclosure provides a battery cell comprising: an electrode assembly; a housing in which the electrode assembly is accommodated and which has a vent hole formed at the top thereof; and a venting unit which is coupled to the vent hole, wherein: the venting unit includes a cap which is coupled to the housing to open / close the top of the vent hole, and a vent plate which is coupled to the housing to seal the bottom of the vent hole; the cap opens the top of the vent hole when in a first state and seals the top of the vent hole when in a second state; and the vent plate opens the bottom of the vent hole when in the first state.

Description

battery cell

[0001] The present disclosure relates to a battery cell. In particular, the present disclosure relates to a battery cell having an openable vent hole.

[0002] If gas is generated or a fire occurs within a battery cell, the pressure inside the battery cell may increase. This increased pressure may cause the vent plate to rupture, releasing the gas within the cell. This prevents a battery cell explosion.

[0003] However, since the vent plate is usually made of metal, it may be difficult for the vent plate to return to its original shape if it breaks. In other words, if the vent plate breaks, the battery cell may remain open.

[0004] If the battery cell remains open, outside air may enter the battery cell or the electrolyte in the battery cell may evaporate.

[0005] According to one aspect of the present disclosure, the vent hole can be resealed after it has been opened.

[0006] According to one aspect of the present disclosure, a fire extinguishing agent can be provided inside the case when the vent hole is resealed.

[0007] According to one aspect of the present disclosure, the vent plate can be broken into a pointed shape.

[0008] A battery cell according to the present disclosure includes an electrode assembly, a case that accommodates the electrode assembly and forms a vent hole at an upper portion thereof, and a venting portion coupled to the vent hole, wherein the venting portion includes a cap coupled to the case that opens and closes an upper portion of the vent hole, and a vent plate coupled to the case that seals a lower portion of the vent hole, wherein when the case is in a first state, the vent plate opens a lower portion of the vent hole, and the cap opens an upper portion of the vent hole, and when the case is in a second state, the cap can seal an upper portion of the vent hole.

[0009] According to one embodiment of the present disclosure, a cap may be provided that re-seals the vent hole after the vent hole has been opened.

[0010] According to one embodiment of the present disclosure, a fire extinguishing agent may be provided inside the case when the vent hole is resealed.

[0011] According to one embodiment of the present disclosure, the vent plate is broken into a sharp shape, which can rupture the fire extinguishing unit that receives the fire extinguishing agent.

[0012] FIG. 1 is a drawing showing a battery cell (10) according to one embodiment of the present disclosure.

[0013] Figure 2 is a drawing showing a battery cell (10) of Figure 1 viewed from above.

[0014] Figure 3 is a drawing showing the battery cell (10) of Figure 2 cut along A1-A2.

[0015] Figures 4 to 17 are enlarged views of part B of Figure 3.

[0016] FIGS. 4 to 6 are drawings illustrating a cap (210) and a vent plate (220) according to one embodiment of the present disclosure.

[0017] FIGS. 7 to 9 are drawings illustrating a cap (1210) and a vent plate (220) according to one embodiment of the present disclosure.

[0018] FIG. 10 and FIG. 11 are drawings illustrating a cap (2210) and a vent plate (220) according to one embodiment of the present disclosure.

[0019] FIG. 12 and FIG. 13 are drawings illustrating a cap (3210) and a vent plate (220) according to one embodiment of the present disclosure.

[0020] FIG. 14 is a drawing illustrating a cap (4210) and a vent plate (220) according to one embodiment of the present disclosure.

[0021] FIGS. 15 to 17 are drawings illustrating a cap (5210) and a vent plate (220) according to one embodiment of the present disclosure.

[0022] FIG. 18 and FIG. 19 are drawings illustrating a vent plate (1220) according to one embodiment of the present disclosure.

[0023] FIG. 20 is a drawing illustrating a vent plate (2220) according to one embodiment of the present disclosure.

[0024] FIG. 21 is a drawing illustrating a vent plate (3220) according to one embodiment of the present disclosure.

[0025] Hereinafter, the present disclosure will be described in detail with reference to FIGS. 1 to 21. However, these are merely exemplary and the present disclosure is not limited to the specific embodiments described as examples.

[0026] FIG. 1 is a drawing showing a battery cell (10) according to one embodiment of the present disclosure.

[0027] A battery cell (10) may include a case (100). The case (100) may include a receiving portion (110) and a cap plate (120) coupled to the receiving portion (110).

[0028] The receiving portion (110) can form an internal space. One side of the receiving portion (110) can be open. For example, the upper side of the receiving portion (110) can be open. That is, an opening can be formed at the top of the receiving portion (110). For example, the internal space formed in the receiving portion (110) can be opened upward. The receiving portion (110) can accommodate an electrode assembly (not shown).

[0029] The cap plate (120) can be coupled to the upper end of the receiving portion (110). The cap plate (120) can cover the upper side of the receiving portion (110). That is, the cap plate (120) can block an opening formed in the receiving portion (110).

[0030] The battery cell (10) may include a venting portion (200). The venting portion (200) may be coupled to or formed in the cap plate (120). When the pressure inside the receiving portion (110) becomes higher than a preset first pressure, the venting portion (200) may be opened.

[0031] The battery cell (10) may include an electrode (300). The electrode (300) may be coupled to a cap plate (120). The electrode (300) may include a first electrode (310) and a second electrode (320).

[0032] The polarity of the first electrode (310) and the polarity of the second electrode (320) may be opposite to each other. For example, the first electrode (310) may be a positive electrode, and the second electrode (320) may be a negative electrode. The electrode (300) may be coupled or connected to an electrode assembly (not shown) accommodated in the case (100).

[0033] Figure 2 is a drawing showing a battery cell (10) of Figure 1 viewed from above.

[0034] The cap plate (120) may include a first side (1201). The first side (1201) may be formed to extend in the front-back direction. The first side (1201) may form one side of the cap plate (120). For example, the first side (1201) may form the left side of the cap plate (120). The first side (1201) may be adjacent to the first electrode (310).

[0035] The cap plate (120) may include a second side (1202). The second side (1202) may be formed to extend in the front-back direction. The second side (1202) may form the other side of the cap plate (120). For example, the second side (1202) may form the right side of the cap plate (120). The second side (1202) may be adjacent to the second electrode (320).

[0036] The first side (1201), the first electrode (310), the venting portion (200), the second electrode (320), and the second side (1202) may be arranged sequentially. The first electrode (310) may be positioned between the first side (1201) and the venting portion (200). The second electrode (320) may be positioned between the second side (1202) and the venting portion (200).

[0037] The cap plate (120) may include a third side (1203). The third side (1203) may be formed to extend in the left-right direction. The third side (1203) may be formed to extend from the front end of the first side (1201) to the front end of the second side (1202). The third side (1203) may form a front side of the cap plate (120).

[0038] The third side (1203) may be positioned in front of the electrode (300). The third side (1203) may be positioned in front of the venting portion (200). That is, the venting portion (200) and the electrode (300) may be positioned behind the third side (1203).

[0039] The cap plate (120) may include a fourth side (1204). The fourth side (1204) may be formed to extend in the left-right direction. The fourth side (1204) may be formed to extend from the rear end of the first side (1201) to the rear end of the second side (1202). The fourth side (1204) may form the rear side of the cap plate (120).

[0040] The fourth side (1204) may be located behind the electrode (300). The fourth side (1204) may be located behind the venting portion (200). That is, the venting portion (200) and the electrode (300) may be located in front of the fourth side (1204).

[0041] The venting portion (200) and the electrode (300) may be positioned between the first side (1201) and the second side (1202). The venting portion (200) and the electrode (300) may be positioned between the third side (1203) and the fourth side (1204). The venting portion (200) may be positioned between the first electrode (310) and the second electrode (320).

[0042] Figure 3 is a drawing showing the battery cell (10) of Figure 2 cut along A1-A2.

[0043] An internal space (130) may be formed inside the receiving portion (110). An electrode assembly (not shown) may be received in the receiving portion (110). That is, the electrode assembly (not shown) may be located in the internal space (130).

[0044] The cap plate (120) can be coupled or connected to the receiving portion (110). The cap plate (120) can seal the internal space (130). The internal space (130) can be surrounded by the receiving portion (110) and the cap plate (120).

[0045] The venting portion (200) can be opened when the pressure in the internal space (130) increases. When the venting portion (200) is opened, the internal space (130) can be connected to the exterior of the battery cell (10). This can reduce the pressure in the internal space (130).

[0046] Figures 4 to 6 are drawings showing part B of Figure 3. Figures 4 to 6 are drawings showing a cap (210) and a vent plate (220) according to one embodiment of the present disclosure.

[0047] The cap plate (120) may include a cap plate body (123). The cap plate body (123) may have a plate shape. The cap plate body (123) may be formed to extend in the left and right directions. The inner side of the cap plate (120) may be the side facing the inner space (130). The outer side of the cap plate (120) may be the opposite side of the inner space (130).

[0048] The cap plate (120) may include a vent hole (124). The vent hole (124) may be formed by penetrating the cap plate body (123) in the vertical direction. The venting portion (200) may be coupled to the vent hole (124).

[0049] The cap plate body (123) may include a first cap plate body (121) coupled with one side (left side) of the venting portion (200). The cap plate body (123) may include a second cap plate body (122) coupled with the other side (right side) of the venting portion (200). The cap plate body (123) may be formed integrally. The first cap plate body (121) and the second cap plate body (122) may be names that arbitrarily distinguish each part of the cap plate body (123).

[0050] The venting portion (200) may include a cap (210). The cap (210) may be coupled to the upper portion of the cap plate body (123). The cap (210) may cover the upper portion of the vent hole (124). The cap (210) may seal the upper portion of the vent hole (124).

[0051] The venting portion (200) may include a vent plate (220). The vent plate (220) may be coupled to the lower portion of the cap plate body (123). The vent plate (220) may block the lower portion of the vent hole (124). The vent plate (220) may seal the lower portion of the vent hole (124).

[0052] The vent plate (220) may be positioned spaced apart from the cap (210). For example, the vent plate (220) may be positioned spaced downward from the cap (210).

[0053] The vent plate (220) may include a metal material. For example, the vent plate (220) may include an aluminum material. The vent plate (220) may be broken when the pressure in the internal space (130) becomes higher than a preset first pressure. When the vent plate (220) is broken, the vent hole (124) may be in communication with the internal space (130). When the pressure in the vent hole (124) increases, at least a portion of the cap (210) may be separated from the cap plate (120). This may allow the vent hole (124) to be in communication with the outside of the cap plate (120).

[0054] The cap (210) may include a first cap body (211). The first cap body (211) may be coupled to a first cap plate body (121). For example, the first cap plate body (121) may include a groove into which the first cap body (211) is coupled. The first cap body (211) may be fixed to the first cap plate body (121).

[0055] The cap (210) may include a second cap body (212). The second cap body (212) may be formed to extend from the first cap body (211) toward the second cap plate body (122). For example, the second cap body (212) may be formed to extend to the right from the first cap body (211).

[0056] The right end of the second cap body (212) can be in contact with the second cap plate body (122). The right end of the second cap body (212) can be coupled to the second cap plate body (122). For example, the cap plate (120) may be formed by being recessed in the upper surface (outer surface) of the second cap plate body (122) and may include a groove through which the right end of the second cap body (212) hangs. For example, the cap (210) may include a protrusion formed by extending from the right end of the second cap body (212), and the cap plate (120) may include a groove formed in the second cap plate body (122) and coupled to the protrusion of the cap (210). For example, the cap plate (120) may include a protrusion formed by extending from the left end of the second cap plate body (122) and in contact with the lower surface of the second cap plate body (122). As a result, when the second cap body (212) rotates toward the inside of the cap plate (120), the rotation of the second cap body (212) can be prevented.

[0057] The cap (210) may include a joint (213). The joint (213) may be a portion where the first cap body (211) and the second cap body (212) are connected. The joint (213) may be foldable. The joint (213) may include an elastic material.

[0058] For example, the joint (213) may include a groove formed by being opened upward. The second cap body (212) may rotate around the joint (213). The second cap body (212) may be lifted upward while being connected to the joint (213). At this time, the joint (213) may be tensioned. When the external force applied to the second cap body (212) decreases, the second cap body (212) may rotate while being connected to the joint (213) and return to its initial state.

[0059] As illustrated in Fig. 4, in the initial state, the vent plate (220) can seal the lower part of the vent hole (124), and the cap (210) can seal the upper part of the vent hole (124). The vent plate (220) can separate the internal space (130) and the vent hole (124).

[0060] When gas is generated in the internal space (130), the pressure of the internal space (130) may increase. A state in which the pressure of the internal space (130) is higher than a preset first pressure may be referred to as a first state. The first pressure may be higher than the pressure of the initial state.

[0061] As illustrated in FIG. 5, in the first state, the vent plate (220) may be broken. When the vent plate (220) is broken, the pressure inside the vent hole (124) increases, and force may be applied to the second cap body (212). The second cap body (212) may rotate around the joint (213). The second cap body (212) may rotate toward the outside of the cap plate (120). At least a portion of the second cap body (212) may be separated from the second cap plate body (122). The internal space (130) may be communicated with the outside of the battery cell (10, see FIG. 3) through the vent hole (124). At this time, the joint (213) may be tensioned between the first cap body (211) and the second cap body (212).

[0062] When the vent hole (124) is opened, the gas in the internal space (130) is discharged, so that the pressure in the internal space (130) may decrease. A state in which the pressure in the internal space (130) becomes lower than a preset second pressure after the first state may be referred to as a second state. The second pressure may be lower than the first pressure. The initial state, the first state, and the second state may occur sequentially.

[0063] As illustrated in FIG. 6, in the second state, the external force applied to the second cap body (212) can be reduced. In the second state, the second cap body (212) can rotate around the joint (213). The second cap body (212) can rotate toward the inside of the cap plate (120). The second cap body (212) can rotate by the elastic restoring force of the joint (213). The second cap body (212) can rotate by gravity. The second cap body (212) can contact the second cap plate body (122) to seal the upper portion of the vent hole (124). As a result, the internal space (130) can be sealed.

[0064] For example, when the vent plate (220) in FIG. 4 is broken into the first vent plate (221) and the second vent plate (222), the broken first vent plate (221) or second vent plate (222) can lift the second cap body (212). When the pressure in the internal space (130) decreases, the second cap body (212) can be rotated by the elastic restoring force of the joint (213) and gravity. The second cap body (212) can push the broken first cap body (211) or second cap body (212) toward the inside of the cap plate (120). The second cap body (212) can seal the upper portion of the vent hole (124).

[0065] Figures 7 to 9 are drawings showing part B of Figure 3. Figures 7 to 9 are drawings showing a cap (1210) and a vent plate (220) according to one embodiment of the present disclosure.

[0066] The venting portion (200) may include a cap (1210). The cap (1210) may be coupled to the upper portion of the cap plate (120). The cap (1210) may cover the upper portion of the vent hole (124). The cap (5210) may seal the upper portion of the vent hole (124).

[0067] The cap (1210) may include a cap body (1211). The cap body (1211) may be formed to extend in one direction (left and right). One side (left side) of the cap body (1211) may be coupled to a first cap plate body (121). The other side (right side) of the cap body (1211) may be coupled to a second cap plate body (122).

[0068] The cap (1210) may include a rotational axis (1212). The cap body (1211) may be coupled to the first cap plate body (121) by the rotational axis (1212). For example, the rotational axis (1212) may be in the form of a pin. For example, the cap plate (120) may be formed by being recessed in the upper surface (outer surface) of the first cap plate body (121) and may include a groove that one side (left side) of the cap body (1211) is spanned by. The rotational axis (1212) may be arranged across the groove formed in the first cap plate body (121). For example, the rotational axis (1212) may be formed by extending in the front-back direction. The cap body (1211) may rotate around the rotational axis (1212).

[0069] As shown in Fig. 7, in the initial state, the vent plate (220) can seal the lower part of the vent hole (124), and the cap (1210) can seal the upper part of the vent hole (124).

[0070] As illustrated in FIG. 8, in the first state, the vent plate (220) may be broken. When the vent plate (220) is broken, the pressure inside the vent hole (124) increases, and force may be applied to the cap body (1211). The cap body (1211) may rotate around the rotational axis (1212). The cap body (1211) may rotate toward the outside of the cap plate (120). At least a portion of the cap body (1211) may be separated from the second cap plate body (122).

[0071] As illustrated in FIG. 9, in the second state, the cap body (1211) can rotate around the rotation axis (1212). The cap body (1211) can rotate toward the inside of the cap plate (120). The cap body (1211) can contact the second cap plate body (122) to seal the upper portion of the vent hole (124). As a result, the internal space (130) can be sealed.

[0072] Figures 10 and 11 are drawings showing part B of Figure 3. Figures 10 and 11 are drawings showing a cap (2210) and a vent plate (220) according to one embodiment of the present disclosure.

[0073] The venting portion (200) may include a cap (2210). The cap (2210) may be coupled to the upper portion of the cap plate (120). The cap (2210) may cover the upper portion of the vent hole (124). The cap (2210) may seal the upper portion of the vent hole (124).

[0074] The cap (2210) may include a cap body (2211). The cap body (2211) may be formed to extend in one direction (left and right). One side (left side) of the cap body (2211) may be coupled to a first cap plate body (121). The other side (right side) of the cap body (2211) may be coupled to a second cap plate body (122).

[0075] The cap (2210) may include a connecting portion (2212). The connecting portion (2212) may connect the first cap plate body (121) and the cap body (2211).

[0076] The connecting portion (2212) may include a first connecting member (2213). The first connecting member (2213) may be coupled to the first cap plate body (121). For example, the first connecting member (2213) may be coupled to the upper surface of the first cap plate body (121).

[0077] The connecting portion (2212) may include a second connecting member (2214). The second connecting member (2214) may be coupled to the cap body (2211). For example, the second connecting member (2214) may be coupled to the upper surface of the cap body (2211).

[0078] The connecting member (2212) may include a rotational axis (2215). The rotational axis (2215) may connect a first connecting member (2213) and a second connecting member (2214). The first connecting member (2213) may rotate around the rotational axis (2215). The second connecting member (2214) may rotate around the rotational axis (2215). In other words, the first connecting member (2213) and the second connecting member (2214) may rotate around one rotational axis (2215). The rotational axis (2215) may be formed to extend in the front-rear direction. For example, the connecting member (2212) may be formed in a hinge shape.

[0079] As shown in Fig. 10, in the initial state, the vent plate (220) can seal the lower part of the vent hole (124), and the cap (2210) can seal the upper part of the vent hole (124).

[0080] As illustrated in FIG. 11, in the first state, the vent plate (220) may be broken. When the vent plate (220) is broken, the pressure inside the vent hole (124) increases, and force may be applied to the cap body (2211). The cap body (2211) and the second connecting member (2214) may rotate around the rotational axis (2215). The cap body (2211) and the second connecting member (2214) may rotate toward the outside of the cap plate (120). At least a portion of the cap body (2211) may be separated from the second cap plate body (122).

[0081] In the second state, the cap body (2211) can rotate toward the inside of the cap plate (120) about the rotation axis (2215). The cap body (2211) can contact the second cap plate body (122) to seal the upper portion of the vent hole (124). This can seal the internal space (130).

[0082] Figures 12 and 13 are drawings showing part B of Figure 3. Figures 12 and 13 are drawings showing a cap (3210) and a vent plate (220) according to one embodiment of the present disclosure.

[0083] The venting portion (200) may include a cap (3210). The cap (3210) may be coupled to the upper portion of the cap plate (120). The cap (3210) may cover the upper portion of the vent hole (124). The cap (3210) may seal the upper portion of the vent hole (124).

[0084] The cap (3210) may be formed to extend in one direction (left and right). The first end (3211) of the cap (3210) may be coupled and fixed to the first cap plate body (121). The second end (3212) of the cap (3210) may be coupled to and in contact with the second cap plate body (122).

[0085] For example, the cap (3210) may include a shape memory alloy material. For example, the cap (3210) may include a bimetal. When the temperature of the vent hole (124) exceeds a preset first temperature, the cap (3210) may be bent. For example, the second end (3212) may be bent so as to move toward the outside of the cap plate (120).

[0086] As shown in Fig. 12, in the initial state, the vent plate (220) can seal the lower part of the vent hole (124), and the cap (3210) can seal the upper part of the vent hole (124).

[0087] When the temperature of the internal space (130) increases, the pressure of the internal space (130) may increase. A state in which the temperature of the internal space (130) is higher than a preset first temperature may be referred to as a first state. The first temperature may be higher than the temperature of the initial state. In the first state, the pressure of the internal space (130) may be higher than the pressure of the initial state.

[0088] As illustrated in FIG. 13, in the first state, the vent plate (220) may be broken. In the first state, the cap (3210) may be deformed so that the second end (3212) may move toward the outside of the cap plate (120). At least a portion of the second end (3212) may be separated from the second cap plate body (122).

[0089] When the vent hole (124) is opened, the temperature of the internal space (130) may decrease. A state in which the temperature of the internal space (130) becomes lower than a preset second temperature after the first state may be referred to as a second state. The second temperature may be lower than the first temperature. The initial state, the first state, and the second state may occur sequentially.

[0090] In the second state, the cap (3210) can be restored to its initial form. In the second state, the cap (3210) can seal the upper side of the vent hole (124).

[0091] Fig. 14 is a drawing showing part B of Fig. 3. Fig. 14 is a drawing showing a cap (4210) and a vent plate (220) according to one embodiment of the present disclosure.

[0092] The cap (4210) may include a first cap (4211). The first cap (4211) may be coupled to the first cap plate body (121) and may extend toward the second cap plate body (122).

[0093] The cap (4210) may include a second cap (4212). The second cap (4212) may be coupled to the second cap plate body (122) and may extend toward the first cap plate body (121). The second cap (4212) may be coupled to the first cap (4211) by contacting the first cap (4211). The first cap (4211) and the second cap (4212) may seal the upper portion of the vent hole (124).

[0094] For example, the first cap (4211) and the second cap (4212) may include a shape memory alloy material. For example, the first cap (4211) and the second cap (4212) may include a bimetal. In the first state, the first cap (4211) and the second cap (4212) may be bent. For example, in the first state, the first cap (4211) and the second cap (4212) may be bent such that the free ends move toward the outside of the cap plate (120). In the second state, the first cap (4211) and the second cap (4212) may be restored to their initial shapes.

[0095] For example, the first cap (4211) and the second cap (4212) may include an elastic material. In the first state, the first cap (4211) and the second cap (4212) may be bent so that the free ends move toward the outside of the cap plate (120). In the second state, the first cap (4211) and the second cap (4212) may be elastically recovered and returned to their initial shapes.

[0096] FIG. 14 is a drawing showing a state in which the vent plate (220) is broken in the first state, and as a result, the free end of the first cap (4211) and the free end of the second cap (4212) move toward the outside of the cap plate (120) and are bent.

[0097] Figures 15 to 17 are drawings showing part B of Figure 3. Figures 15 to 17 are drawings showing a cap (5210) and a vent plate (220) according to one embodiment of the present disclosure.

[0098] The cap (5210) may include a cap body (5211). The cap body (5211) may be formed to extend in one direction (left and right). One side (left side) of the cap body (5211) may be coupled to a first cap plate body (121). The other side (right side) of the cap body (5211) may be coupled to a second cap plate body (122).

[0099] The cap (5210) may include a rotational axis (5212). The cap body (5211) may be coupled to the first cap plate body (521) by the rotational axis (5212). For example, the rotational axis (5212) may be in the form of a pin. For example, the cap plate (120) may be formed by being recessed in the upper surface (outer surface) of the first cap plate body (121) and may include a groove that one side (left side) of the cap body (5211) is hung on. The rotational axis (5212) may be arranged across the groove formed in the first cap plate body (121). For example, the rotational axis (5212) may be formed by extending in the front-back direction. The cap body (5211) may rotate around the rotational axis (5212).

[0100] The cap (5210) may include a fire extinguishing unit (5213). The fire extinguishing unit (5213) may accommodate a fire extinguishing agent (5214). The fire extinguishing unit (5213) may be coupled to the lower surface of the cap body (5211). The fire extinguishing unit (5213) may be coupled to the lower surface of the cap body (5211) and formed to protrude downward.

[0101] As shown in Fig. 15, in the initial state, the vent plate (220) can seal the lower part of the vent hole (124), and the cap (5210) can seal the upper part of the vent hole (124).

[0102] As illustrated in FIG. 16, in the first state, the vent plate (220) may be broken. When the vent plate (220) is broken, the pressure inside the vent hole (124) increases, and force may be applied to the cap body (5211). The cap body (5211) may rotate around the rotational axis (5212). The cap body (5211) may rotate toward the outside of the cap plate (120). At least a portion of the cap body (5211) may be separated from the second cap plate body (122). The digestion unit (5213) may be coupled to the cap body (5211) and may move toward the outside of the cap plate (120).

[0103] As illustrated in FIG. 17, in the second state, the cap body (5211) can rotate around the rotation axis (5212). The cap body (5211) can rotate toward the inside of the cap plate (120). The cap body (5211) can contact the second cap plate body (122) to seal the upper portion of the vent hole (124). As a result, the internal space (130) can be sealed.

[0104] At this time, the fire extinguishing unit (5213) may be placed between the cap body (5211) and the broken vent plate (220). The fire extinguishing unit (5213) may be ruptured by the force of the cap body (5211) coming down upon contact with the broken vent plate (220). When the fire extinguishing unit (5213) is ruptured, the fire extinguishing agent (5214) within the fire extinguishing unit (5213) may be discharged into the vent hole (124). The fire extinguishing agent (5214) may be discharged into the internal space (130) through the vent hole (124). As a result, when a fire occurs within the internal space (130), the fire may be extinguished by the fire extinguishing agent (5214).

[0105] FIG. 18 and FIG. 19 are drawings illustrating a vent plate (1220) according to one embodiment of the present disclosure.

[0106] The vent plate (1220) may include a vent plate body (1230). The vent plate body (1230) may be formed in a plate shape. The vent plate body (1230) may be formed to extend in the left-right direction and the front-back direction.

[0107] The vent plate body (1230) may include a first coupling portion (1221). The first coupling portion (1221) may be formed to extend in the front-back direction. The first coupling portion (1221) may face the first side (1201, see FIG. 2) of the cap plate (120, see FIG. 2). The first coupling portion (1221) forms the left side of the vent plate body (1230) and may be coupled to the cap plate (120, see FIG. 2).

[0108] The vent plate body (1230) may include a second coupling portion (1222). The second coupling portion (1222) may be formed to extend in the front-rear direction. The second coupling portion (1222) may face the second side (1202, see FIG. 2) of the cap plate (120, see FIG. 2). The second coupling portion (1222) forms the right side of the vent plate body (1230) and may be coupled to the cap plate (120, see FIG. 2).

[0109] The vent plate body (1230) may include a third connecting portion (1223). The third connecting portion (1223) may be formed to extend from the front end of the first connecting portion (1221) to the front end of the second connecting portion (1222). The third connecting portion (1223) may face the third side (1203, see FIG. 2) of the cap plate (120, see FIG. 2). The third connecting portion (1223) forms the front side of the vent plate body (1230) and may be connected to the cap plate (120, see FIG. 2).

[0110] The vent plate body (1230) may include a fourth connecting portion (1224). The fourth connecting portion (1224) may be formed to extend from the rear end of the first connecting portion (1221) to the rear end of the second connecting portion (1222). The fourth connecting portion (1224) may face the fourth side (1204, see FIG. 2) of the cap plate (120, see FIG. 2). The fourth connecting portion (1224) forms the rear side of the vent plate body (1230) and may be connected to the cap plate (120, see FIG. 2).

[0111] The connecting portion (1221, 1222, 1223, 1224) may refer to any one of the first connecting portion (1221), the second connecting portion (1222), the third connecting portion (1223), and the fourth connecting portion (1224). The connecting portion (1221, 1222, 1223, 1224) may form the perimeter of the vent plate body (1230).

[0112] The vent plate (1220) may include a fracture line (1225). The fracture line (1225) may be formed on the vent plate body (1230). For example, the fracture line (1225) may be formed concavely on the upper or lower surface of the vent plate body (1230). For example, the fracture line (1225) may be a pressing line. For example, the fracture line (1225) may be a portion of the vent plate body (1230) that is weaker in strength than other portions. In the first state, the vent plate body (1230) may fracture along the fracture line (1225).

[0113] The break line (1225) may include a first break line (12251). The first break line (12251) may be positioned at the center of the vent plate body (1230). The first break line (12251) may be formed to extend in the left-right direction, but may be spaced apart from the first coupling portion (1221) and the second coupling portion (1222). The first break line (12251) may include a left end adjacent to the first coupling portion (1221) and a right end adjacent to the second coupling portion (1222).

[0114] The fracture line (1225) may include a second fracture line (12252). The second fracture line (12252) may be formed by extending from the front end of the first joint (1221) to the left end of the first fracture line (12251).

[0115] The fracture line (1225) may include a third fracture line (12253). The third fracture line (12253) may be formed by extending from the rear end of the first connecting portion (1221) to the left end of the first fracture line (12251).

[0116] The vent plate body (1230) may include a first part (1231). The first part (1231) may be formed by being surrounded by a first connecting portion (1221), a second breaking line (12252), and a third breaking line (12253). For example, the first part (1231) may have a triangular shape with the first connecting portion (1221) as a base. The first part (1231) may include a first part end portion (12311). The first part end portion (12311) may be a vertex where the second breaking line (12252) and the third breaking line (12253) meet among the vertices of the first part (1231).

[0117] When the vent plate body (1230) is broken along the fracture line (1225), the first part (1231) can be rotated about the first connecting portion (1221) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (1230) in the first state, the first part (1231) can be rotated so that the first part end (12311) faces upward.

[0118] The fracture line (1225) may include a fourth fracture line (12254). The fourth fracture line (12254) may be formed by extending from the front end of the second joint (1222) to the right end of the first fracture line (12251).

[0119] The fracture line (1225) may include a fifth fracture line (12255). The fifth fracture line (12255) may be formed by extending from the rear end of the second connecting portion (1222) to the right end of the first fracture line (12251).

[0120] The vent plate body (1230) may include a second part (1232). The second part (1232) may be formed by being surrounded by a second connecting portion (1222), a fourth breaking line (12254), and a fifth breaking line (12255). For example, the second part (1232) may have a triangular shape with the second connecting portion (1222) as a base. The second part (1232) may include a second part end portion (12321). The second part end portion (12321) may be a vertex where the fourth breaking line (12254) and the fifth breaking line (12255) among the vertices of the second part (1232) meet.

[0121] When the vent plate body (1230) is broken along the fracture line (1225), the second part (1232) can be rotated about the second connecting portion (1222) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (1230) in the first state, the second part (1232) can be rotated so that the second part end (12321) faces upward.

[0122] The vent plate body (1230) may include a third part (1233). The third part (1233) may be formed by being surrounded by a third connecting portion (1223), a first break line (12251), a second break line (12252), and a fourth break line (12254). For example, the third part (1233) may have a trapezoidal shape with the third connecting portion (1223) as a bottom edge and the first break line (12251) as an top edge. When the vent plate body (1230) is broken along the break line (1225), the third part (1233) may rotate about the third connecting portion (1223) as a rotational axis.

[0123] The vent plate body (1230) may include a fourth part (1234). The fourth part (1234) may be formed by being surrounded by a fourth connecting portion (1224), a first break line (12251), a third break line (12253), and a fifth break line (12255). For example, the fourth part (1234) may have a trapezoidal shape with the fourth connecting portion (1224) as a bottom edge and the first break line (12251) as an top edge. When the vent plate body (1230) is broken along the break line (1225), the fourth part (1234) may rotate about the fourth connecting portion (1224) as a rotational axis.

[0124] As illustrated in FIG. 18, when the pressure applied to the vent plate (1220) is less than or equal to a preset second pressure, the vent plate body (1230) can maintain the shape of the plate.

[0125] As illustrated in FIG. 19, in the first state, the vent plate body (1230) can be broken along a fracture line (1225, see FIG. 18). The vent plate body (1230) can be divided into a first part (1231), a second part (1232), a third part (1233), and a fourth part (1234). The first part end (12311) of the first part (1231) or the second part end (12321) of the second part (1232) can face upward. The vent plate body (1230) can form an opening (1226) that penetrates in the vertical direction.

[0126] As illustrated in FIGS. 16 and 17, when the cap body (5211) rotates toward the outside of the cap plate (120) and then rotates toward the inside of the cap plate (120), the extinguishing member (5213) may rupture by contacting the first part end (12311) or the second part end (12321). The extinguishing agent (5214) may be discharged from the extinguishing member (5213) and introduced into the internal space (130) through the opening (1226, see FIG. 19).

[0127] FIG. 20 is a drawing illustrating a vent plate (2220) according to one embodiment of the present disclosure.

[0128] The vent plate (2220) may include a vent plate body (2230). The vent plate body (2230) may be formed in a plate shape. The vent plate body (2230) may be formed to extend in the left-right direction and the front-back direction.

[0129] The vent plate body (2230) may include a first coupling portion (2221). The first coupling portion (2221) may be formed to extend in the front-back direction. The first coupling portion (2221) may face the first side (1201, see FIG. 2) of the cap plate (120, see FIG. 2). The first coupling portion (2221) forms the left side of the vent plate body (2230) and may be coupled to the cap plate (120, see FIG. 2).

[0130] The vent plate body (2230) may include a second coupling portion (2222). The second coupling portion (2222) may be formed to extend in the front-back direction. The second coupling portion (2222) may face the second side (1202, see FIG. 2) of the cap plate (120, see FIG. 2). The second coupling portion (2222) forms the right side of the vent plate body (2230) and may be coupled to the cap plate (120, see FIG. 2).

[0131] The vent plate body (2230) may include a third coupling portion (2223). The third coupling portion (2223) may be formed to extend from the front end of the first coupling portion (2221) to the front end of the second coupling portion (2222). The third coupling portion (2223) may face the third side (1203, see FIG. 2) of the cap plate (120, see FIG. 2). The third coupling portion (2223) forms the front side of the vent plate body (2230) and may be coupled to the cap plate (120, see FIG. 2).

[0132] The vent plate body (2230) may include a fourth connecting portion (2224). The fourth connecting portion (2224) may be formed to extend from the rear end of the first connecting portion (2221) to the rear end of the second connecting portion (2222). The fourth connecting portion (2224) may face the fourth side (1204, see FIG. 2) of the cap plate (120, see FIG. 2). The fourth connecting portion (2224) forms the rear side of the vent plate body (2230) and may be connected to the cap plate (120, see FIG. 2).

[0133] The connecting portion (2221, 2222, 2223, 2224) may refer to any one of the first connecting portion (2221), the second connecting portion (2222), the third connecting portion (2223), and the fourth connecting portion (2224). The connecting portion (2221, 2222, 2223, 2224) may form the perimeter of the vent plate body (2230).

[0134] The vent plate (2220) may include a fracture line (2225). The fracture line (2225) may be formed on the vent plate body (2230). For example, the fracture line (2225) may be formed concavely on the upper or lower surface of the vent plate body (2230). For example, the fracture line (2225) may be a pressing line. For example, the fracture line (2225) may be a portion of the vent plate body (2230) that is weaker in strength than other portions. In the first state, the vent plate body (2230) may fracture along the fracture line (2225).

[0135] The break line (2225) may include a first break line (22251). The first break line (22251) may be positioned at the center of the vent plate body (2230). The first break line (22251) may be formed to extend in the left-right direction, but may be spaced apart from the first coupling portion (2221) and the second coupling portion (2222). The first break line (22251) may include a left end adjacent to the first coupling portion (2221) and a right end adjacent to the second coupling portion (2222).

[0136] The fracture line (2225) may include a second fracture line (22252). The second fracture line (22252) may be formed by extending from the front end of the first joint (2221) to the left end of the first fracture line (22251).

[0137] The fracture line (2225) may include a third fracture line (22253). The third fracture line (22253) may be formed by extending from the rear end of the first connecting portion (2221) to the left end of the first fracture line (22251).

[0138] The vent plate body (2230) may include a first part (2231). The first part (2231) may be formed by being surrounded by a first connecting portion (2221), a second breaking line (22252), and a third breaking line (22253). For example, the first part (2231) may have a triangular shape with the first connecting portion (2221) as a base. The first part (2231) may include a first part end portion (22311). The first part end portion (22311) may be a vertex where the second breaking line (22252) and the third breaking line (22253) meet among the vertices of the first part (2231).

[0139] When the vent plate body (2230) is broken along the fracture line (2225), the first part (2231) can be rotated about the first connecting portion (2221) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (1230) in the first state, the first part (2231) can be rotated so that the first part end (22311) faces upward.

[0140] The fracture line (2225) may include a fourth fracture line (22254). The fourth fracture line (22254) may be formed by extending from the right end of the first fracture line (22251) to the second connecting portion (2222). For example, the fourth fracture line (22254) may be formed by extending from the right end of the first fracture line (22251) to the center of the second connecting portion (2222). The fourth fracture line (22254) may include a left end connected to the first fracture line (22251).

[0141] The fracture line (2225) may include a fifth fracture line (22255). The fifth fracture line (22255) may be formed by extending from the front end of the second connecting portion (2222) toward the first fracture line (22251). The fifth fracture line (22255) may include a left end that is spaced apart from the first fracture line (22251) but is positioned adjacent to the first fracture line (22251). The left end of the fifth fracture line (22255) may be positioned to the left of the left end of the fourth fracture line (22254).

[0142] The fracture line (2225) may include a sixth fracture line (22256). The sixth fracture line (22256) may be formed by extending from the left end of the fourth fracture line (22254) to the left end of the fifth fracture line (22255).

[0143] The vent plate body (2230) may include a second part (2232). The second part (2232) may be formed by being surrounded by a second joining portion (2222), a fourth break line (22254), a fifth break line (22255), and a sixth break line (22256). The second part (2232) may include a second part end (22321). The second part end (22321) may be a vertex where the fifth break line (22255) and the sixth break line (22256) meet among the vertices of the second part (2232).

[0144] When the vent plate body (2230) is broken along the fracture line (2225), the second part (2232) can be rotated about the second connecting portion (2222) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (2230) in the first state, the second part (2232) can be rotated so that the second part end (22321) faces upward.

[0145] The fracture line (2225) may include a seventh fracture line (22257). The seventh fracture line (22257) may be formed by extending from the rear end of the second connecting portion (2222) toward the first fracture line (22251). The seventh fracture line (22257) may include a left end that is spaced apart from the first fracture line (22251) but is positioned adjacent to the first fracture line (22251). The left end of the seventh fracture line (22257) may be positioned to the left of the left end of the fourth fracture line (22254).

[0146] The fracture line (2225) may include an eighth fracture line (22258). The eighth fracture line (22258) may be formed by extending from the left end of the fourth fracture line (22254) to the left end of the seventh fracture line (2225).

[0147] The vent plate body (2230) may include a third part (2233). The third part (2233) may be formed by being surrounded by a second joining portion (2222), a fourth breaking line (22254), a seventh breaking line (22257), and an eighth breaking line (22258). The third part (2233) may include a third part end (22331). The third part end (22331) may be a vertex where the seventh breaking line (22257) and the eighth breaking line (22258) meet among the vertices of the third part (2233).

[0148] When the vent plate body (2230) is broken along the fracture line (2225), the third part (2233) can be rotated about the second connecting portion (2222) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (2230) in the first state, the third part (2233) can be rotated so that the third part end (22331) faces upward.

[0149] The vent plate body (2230) may include a fourth part (2234). The fourth part (2234) may be formed by being surrounded by a third connecting portion (2223), a first break line (22251), a second break line (22252), a fifth break line (22255), and a sixth break line (22256). When the vent plate body (2230) is broken along the break line (2225), the fourth part (2234) may rotate about the third connecting portion (2223) as a rotational axis.

[0150] The vent plate body (2230) may include a fifth part (2235). The fifth part (2235) may be formed by surrounding the fourth connecting portion (2224), the first break line (22251), the second break line (22252), the seventh break line (22257), and the eighth break line (22258). When the vent plate body (2230) is broken along the break line (2225), the fifth part (2235) may rotate about the fourth connecting portion (2224) as a rotational axis.

[0151] As illustrated in FIGS. 16 and 17, when the cap body (5211) rotates toward the outside of the cap plate (120) and then rotates toward the inside of the cap plate (120), the extinguishing portion (5213) may be ruptured by contacting the first part end (22311), the second part end (22321), or the third part end (22331). When the extinguishing portion (5213) is positioned to be offset to the right side of the cap body (5211), it may be ruptured by contacting the second part end (22321) or the third part end (22331).

[0152] FIG. 21 is a drawing illustrating a vent plate (3220) according to one embodiment of the present disclosure.

[0153] The vent plate (3220) may include a vent plate body (3230). The vent plate body (3230) may be formed in a plate shape. The vent plate body (3230) may be formed to extend in the left-right direction and the front-back direction.

[0154] The vent plate body (3230) may include a first coupling portion (3221). The first coupling portion (3221) may be formed to extend in the front-back direction. The first coupling portion (3221) may face the first side (1201, see FIG. 2) of the cap plate (120, see FIG. 2). The first coupling portion (3221) forms the left side of the vent plate body (3230) and may be coupled to the cap plate (120, see FIG. 2).

[0155] The vent plate body (3230) may include a second coupling portion (3222). The second coupling portion (3222) may be formed in the shape of an arc. The second coupling portion (3222) may be formed in the shape of a semicircle that protrudes to the right. The second coupling portion (3222) may face the second side (1202, see FIG. 2) of the cap plate (120, see FIG. 2). The second coupling portion (3222) forms the right side of the vent plate body (3230) and may be coupled to the cap plate (120, see FIG. 2).

[0156] The vent plate body (3230) may include a third coupling portion (3223). The third coupling portion (3223) may be formed to extend from the front end of the first coupling portion (3221) to the front end of the second coupling portion (3222). The third coupling portion (3223) may face the third side (1203, see FIG. 2) of the cap plate (120, see FIG. 2). The third coupling portion (3223) forms the front side of the vent plate body (3230) and may be coupled to the cap plate (120, see FIG. 2).

[0157] The vent plate body (3230) may include a fourth connecting portion (3224). The fourth connecting portion (3224) may be formed to extend from the rear end of the first connecting portion (3221) to the rear end of the second connecting portion (3222). The fourth connecting portion (3224) may face the fourth side (1204, see FIG. 2) of the cap plate (120, see FIG. 2). The fourth connecting portion (3224) forms the rear side of the vent plate body (3230) and may be connected to the cap plate (120, see FIG. 2).

[0158] The connecting portion (3221, 3222, 3223, 3224) may refer to any one of the first connecting portion (3221), the second connecting portion (3222), the third connecting portion (3223), and the fourth connecting portion (3224). The connecting portion (3221, 3222, 3223, 3224) may form the perimeter of the vent plate body (3230).

[0159] The vent plate (3220) may include a fracture line (3225). The fracture line (3225) may be formed on the vent plate body (3230). For example, the fracture line (3225) may be formed concavely on the upper or lower surface of the vent plate body (3230). For example, the fracture line (3225) may be a pressing line. For example, the fracture line (3225) may be a portion of the vent plate body (3230) that is weaker in strength than other portions. In the first state, the vent plate body (3230) may fracture along the fracture line (3225).

[0160] The break line (3225) may include a first break line (32251). The first break line (32251) may be positioned at the center of the vent plate body (3230). The first break line (32251) may be formed to extend in the left-right direction, but may be spaced apart from the first coupling portion (3221) and the second coupling portion (3222). The first break line (32251) may include a left end adjacent to the first coupling portion (3221) and a right end adjacent to the second coupling portion (3222).

[0161] The fracture line (3225) may include a second fracture line (32252). The second fracture line (32252) may be formed by extending from the front end of the first joint (3221) to the left end of the first fracture line (32251).

[0162] The break line (3225) may include a third break line (32253). The third break line (32253) may be formed by extending from the rear end of the first connecting portion (3221) to the left end of the first break line (32251).

[0163] The vent plate body (3230) may include a first part (3231). The first part (3231) may be formed by being surrounded by a first connecting portion (3221), a second breaking line (32252), and a third breaking line (32253). For example, the first part (3231) may have a triangular shape with the first connecting portion (3221) as a base. The first part (3231) may include a first part end portion (32311). The first part end portion (32311) may be a vertex where the second breaking line (32252) and the third breaking line (32253) meet among the vertices of the first part (3231).

[0164] When the vent plate body (3230) is broken along the fracture line (3225), the first part (3231) can be rotated about the first connecting portion (3221) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (1230) in the first state, the first part (3231) can be rotated so that the first part end (32311) faces upward.

[0165] The fracture line (3225) may include a fourth fracture line (32254). It may be formed by extending from the center of the second connecting portion (3222) to the right end of the first fracture line (32251). The fourth fracture line (32254) may include a right end that is in contact with the second connecting portion (3222).

[0166] The fracture line (3225) may include a fifth fracture line (32255). The fifth fracture line (32255) may be formed by extending from the front end of the second connecting portion (3222) to the right end of the first fracture line (32251). The fifth fracture line (32255) may include a front end that is in contact with the second connecting portion (3222).

[0167] The fracture line (3225) may include a sixth fracture line (32256). The sixth fracture line (32256) may be formed by extending from the rear end of the second connecting portion (3222) to the right end of the first fracture line (32251). The sixth fracture line (32256) may include a rear end that is in contact with the second connecting portion (3222).

[0168] The fracture line (3225) may include a seventh fracture line (32257). The seventh fracture line (32257) may be formed by extending from a point between the right end of the fourth fracture line (32254) and the front end of the fifth fracture line (32255) of the second joint (3222) to the right end of the first fracture line (32251).

[0169] The fracture line (3225) may include an eighth fracture line (32258). The eighth fracture line (32258) may be formed by extending from a point between the right end of the fourth fracture line (32254) and the rear end of the sixth fracture line (32256) of the second connecting portion (3222) to the right end of the first fracture line (32251).

[0170] The vent plate body (3230) may include a second part (3232). The second part (3232) may be formed by being surrounded by a second connecting portion (3222), a fifth break line (32255), and a seventh break line (32257). The second part (3232) may include a second part end (32321). The second part end (32321) may be a vertex where the fifth break line (32255) and the seventh break line (32257) meet among the vertices of the second part (3232).

[0171] When the vent plate body (3230) is broken along the fracture line (3225), the second part (3232) can be rotated about the second connecting portion (3222) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (3230) in the first state, the second part (3232) can be rotated so that the second part end (32321) faces upward.

[0172] The vent plate body (3230) may include a third part (3233). The third part (3233) may be formed by being surrounded by a second connecting portion (3222), a fourth breaking line (32254), and a seventh breaking line (32257). The third part (3233) may include a third part end (32331). The third part end (32331) may be a vertex where the fourth breaking line (32254) and the seventh breaking line (32257) meet among the vertices of the third part (3233).

[0173] When the vent plate body (3230) is broken along the fracture line (3225), the third part (3233) can be rotated about the second connecting portion (3222) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (3230) in the first state, the third part (3233) can be rotated so that the third part end (32331) faces upward.

[0174] The vent plate body (3230) may include a fourth part (3234). The fourth part (3234) may be formed by being surrounded by the second joining portion (3222), the fourth break line (32254), and the eighth break line (32258). The fourth part (3234) may include a fourth part end (32341). The fourth part end (32341) may be a vertex where the fourth break line (32254) and the eighth break line (32258) meet among the vertices of the fourth part (3234).

[0175] When the vent plate body (3230) is broken along the fracture line (3225), the fourth part (3234) can be rotated about the second connecting portion (3222) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (3230) in the first state, the fourth part (3234) can be rotated so that the fourth part end (32341) faces upward.

[0176] The vent plate body (3230) may include a fifth part (3235). The fifth part (3235) may be formed by being surrounded by a second connecting portion (3222), a sixth break line (32256), and an eighth break line (32258). The fifth part (3235) may include a fifth part end (32351). The fifth part end (32351) may be a vertex where the sixth break line (32256) and the eighth break line (32258) meet among the vertices of the fifth part (3235).

[0177] When the vent plate body (3230) is broken along the fracture line (3225), the fifth part (3235) can be rotated about the second connecting portion (3222) as the rotation axis. For example, when a force is applied upward from the bottom of the vent plate body (3230) in the first state, the fifth part (3235) can be rotated so that the fifth part end (32351) faces upward.

[0178] The vent plate body (3230) may include a sixth part (3236). The sixth part (3236) may be formed by being surrounded by a third connecting portion (3223), a first breaking line (32251), a second breaking line (32252), and a fifth breaking line (32255). When the vent plate body (3230) is broken along the breaking line (3225), the sixth part (3236) may rotate about the third connecting portion (3223) as a rotational axis.

[0179] The vent plate body (3230) may include a seventh part (3237). The seventh part (3237) may be formed by being surrounded by a fourth connecting portion (3224), a first breaking line (32251), a third breaking line (32253), and a sixth breaking line (32256). When the vent plate body (3230) is broken along the breaking line (3225), the seventh part (3237) may rotate about the fourth connecting portion (3224) as a rotational axis.

[0180] As shown in FIGS. 16 and 17, when the cap body (5211) rotates toward the outside of the cap plate (120) and then rotates toward the inside of the cap plate (120), the extinguishing portion (5213) may be ruptured by contacting the first part end (32311), the second part end (32321), the third part end (32331), the fourth part end (32341), or the fifth part end (32351).

[0181] The above description is merely an example of applying the principles of the present disclosure, and other configurations may be further included without departing from the scope of the present disclosure.

Claims

1. Electrode assembly; A case that accommodates the electrode assembly and forms a vent hole at the top; Includes a venting part coupled to the above vent hole, The above venting part, A cap coupled to the case and opening and closing the upper portion of the vent hole; and A vent plate is included, which is coupled to the case and seals the lower part of the vent hole, If the above case is the first state, The above vent plate opens the lower part of the vent hole, and the above cap opens the upper part of the vent hole. If the above case is the second state, The above cap seals the upper part of the above vent hole, Battery cells.

2. In claim 1, The above first state is, The pressure inside the case is higher than the preset first pressure, The second state is, After the above first state, the pressure inside the case becomes lower than the preset second pressure, Battery cells.

3. In claim 2, The above second pressure is, lower than the first pressure, Battery cells.

4. In claim 1, The above first state is, The temperature inside the case is higher than the preset first temperature, The second state is, After the first state, the temperature inside the case becomes lower than or equal to a preset second temperature. Battery cells.

5. In claim 4, The above second temperature is, lower than the first temperature above, Battery cells.

6. In claim 1, The above cap is, Positioned upwardly spaced from the above vent plate, Battery cells.

7. In claim 1, The above cap is, A first cap body coupled to the above case; A second cap body formed by extending from the first cap body and opening and closing the upper portion of the vent hole; and including a joint formed between the first cap body and the second cap body; The above cap is, Folded based on the above joint, Battery cells.

8. In claim 7, The above joint is, Containing elastic material, Battery cells.

9. In claim 7, The above joint is, Including a groove formed by opening upwards, Battery cells.

10. In claim 1, The above cap is, a rotating shaft coupled to the above case; and A cap body, which is coupled to the above rotational axis, rotates around the above rotational axis, and opens and closes the upper portion of the vent hole; Battery cells.

11. In claim 1, The above cap is, A cap body that opens and closes the upper part of the above vent hole; and Includes a connecting portion that is coupled to the cap body and the case, The above connection part is, axis of rotation; A first connecting member fixed to the upper surface of the case and coupled to the rotation shaft; and Including a second connecting member fixed to the upper surface of the cap body, coupled to the rotation axis and rotating around the rotation axis, Battery cells.

12. In claim 4, The above cap is, Containing shape memory alloy materials, Battery cells.

13. In claim 4, The above cap is, Containing bimetal, Battery cells.

14. In claim 1, The above cap is, Containing elastic material, Battery cells.

15. In claim 14, The above cap is, A first cap that opens and closes one side of the upper portion of the above vent hole; and Including a second cap that opens and closes the other side of the upper portion of the above vent hole, Battery cells.

16. In claim 2, It is coupled to the lower surface of the above cap and includes a digestive unit that accommodates a digestive agent, The above vent plate, When the above first state is broken, The above digestive organs are, When in the second state, it is ruptured by the vent plate. Battery cells.

17. In claim 16, The above vent plate, vent plate body; and Including a fracture line formed concavely on the upper or lower surface of the above-mentioned vent plate body, Battery cells.

18. In claim 17, The above vent plate, forming a portion of the periphery of the above vent plate and including an arc-shaped connecting portion coupled to the case; The above break line is, Including a plurality of break lines connected from the center of the above arc to a point of the above joint, Battery cells.

19. In claim 18, The above digestive organs are, Positioned adjacent to the above joint, Battery cells.

20. In any one of claims 7 to 19, The above case is, A protrusion formed by protruding into the vent hole and in contact with the lower surface of the cap body, Battery cells.

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