Vent seal cap for secondary battery and secondary battery including the same

Abstract

The present invention relates to a vent seal cap for a secondary battery and a secondary battery including the same, which can prevent fire of the secondary battery by preventing oxygen from flowing in reverse after discharging gas generated inside the secondary battery to the outside, and improve safety. The vent seal cap for a secondary battery according to the present invention includes a main body having a hollow interior, an intake port provided in the main body, an exhaust port provided in the main body at a position above the intake port, and an opening / closing member provided in the hollow interior of the main body and moving in response to pressure changes in the intake port to open or close the connection between the intake port and the exhaust port.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0079632 filed on June 18, 2021, and Korean Patent Application No. 10-2022-0072951 filed on June 15, 2022, and all the contents disclosed in the Korean patent applications are incorporated herein by reference in their entirety.

[0002] The present invention relates to a vent seal cap for a secondary battery and a secondary battery including the same, and more particularly, to a vent seal cap for a secondary battery and a secondary battery including the same, which can prevent oxygen from flowing back into the secondary battery after discharging gas generated inside the secondary battery to the outside, thereby preventing ignition of the secondary battery and improving safety.

Background Art

[0003] A secondary battery means a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used as a power source for electronic devices such as mobile phones, notebook computers, camcorders, or electric vehicles.

[0004] Generally, types of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and lithium-ion polymer batteries. Such secondary batteries are used not only in small products such as digital cameras, notebook computers, mobile phones, PDAs, and e-bikes, but also in large products that require high power such as electric vehicles and hybrid vehicles, power storage devices for storing surplus generated power and renewable energy, and backup power storage devices.

[0005] Such secondary batteries are classified into a pouch type and a can type, etc., depending on the material of the battery case that houses the electrode assembly. The pouch type houses the electrode assembly in a pouch made of a flexible polymer material with an irregular shape. And the can type houses the electrode assembly in a case made of a material such as metal or plastic with a regular shape.

[0006] In this way, the electrode assembly is housed inside the battery case, and after the electrolyte is injected, it is sealed and operates as a battery. However, in the secondary battery, gas is generated during the charge and discharge process. In particular, when overfilling or internal short circuit of the battery occurs, gas is excessively generated inside the battery case and the pressure inside the battery case rises, which leads to a decrease in the performance of the battery.

[0007] Therefore, a process or device for venting the internal gas of the secondary battery to the outside is essentially required. However, in the venting process of the secondary battery, external air may flow into the battery interior conversely. In this case, not only does the performance of the battery decrease, but also oxygen reacts internally, leading to ignition or explosion of the battery, posing a serious threat to the safety of the user.

[0008] Therefore, there is a need to develop means for discharging the gas generated inside the battery to the outside, appropriately preventing the inflow of outside air, and regulating the internal pressure of the battery. Summary of the Invention Problems to be Solved by the Invention

[0009] The present invention has been made to solve the above problems. The problem of the present invention is to provide a vent seal cap for a secondary battery that can prevent oxygen from flowing back after discharging the gas generated inside the secondary battery to the outside, prevent ignition of the secondary battery, and improve safety, and a secondary battery including the same. Means for Solving the Problems

[0010] The vent seal cap for a secondary battery according to the present invention includes a main body having a hollow formed therein, an intake port provided in the main body, an exhaust port provided in the main body above a position where the intake port is provided, and an opening / closing member provided in the internal hollow of the main body, which opens or closes the connection between the intake port and the exhaust port while moving according to a pressure change of the intake port.

[0011] The intake port can be provided on a side surface of the main body.

[0012] The exhaust port is provided on a side surface of the main body and can be provided on an axis different from an axis on which the intake port is provided with reference to a lateral cross-section of the main body.

[0013] When the pressure of the intake port is greater than a preset value, the opening / closing member can open the connection between the intake port and the exhaust port, and when the pressure of the intake port is less than the preset value, the opening / closing member can close the connection between the intake port and the exhaust port.

[0014] The opening / closing member can be opened in a direction in which gas flows in through the intake port, and a lifting auxiliary groove having a shape that curves toward a central portion of the opening / closing member can be formed.

[0015] The lifting auxiliary groove can be formed in a hairpin structure including an inflow portion into which gas flows in and a head portion having a spherical shape with a diameter larger than the width of the inflow portion.

[0016] The main body can have a circular lateral cross-section.

[0017] A spiral guide groove can be formed on an inner peripheral surface of the main body.

[0018] The opening / closing member has spiral guide protrusions formed on an outer peripheral surface thereof, and the guide protrusions can be inserted into the guide groove of the main body and move up and down.

[0019] The intake port can include a member that absorbs heat and contracts.

[0020] The exhaust port can include an alarm generating device that detects the flow of gas and generates a signal.

[0021] The main body is formed such that the cross-sectional area of the hollow is equal to the lateral cross-sectional area of the opening and closing member, and includes a moving part that can move with the opening and closing member sealing the hollow, and a stopping part provided below the moving part and formed such that the cross-sectional area of the hollow is smaller than the lateral cross-section of the opening and closing member, and that stops the movement of the opening and closing member.

[0022] The exhaust port can be formed on the side surface of the moving part, and the intake port can be formed on the side surface of the stopping part.

[0023] The exhaust port can be formed on the side surface of the moving part, and the intake port can be formed on the lower surface of the stopping part.

[0024] The secondary battery according to the present invention includes a positive electrode, a separator, a negative electrode, an electrode assembly in which the separators are laminated, a battery case in which the electrode assembly is housed, and a vent seal cap provided on the battery case. The vent seal cap includes a main body having a hollow formed therein, an intake port provided on the main body, an exhaust port provided above the position where the intake port is provided on the main body, and an opening and closing member provided in the internal hollow of the main body that opens or closes the connection between the intake port and the exhaust port while moving due to the pressure difference between the intake port and the exhaust port.

[0025] The opening and closing member can be opened in the direction in which gas flows in through the intake port, and a lifting and lowering auxiliary groove can be formed in a shape that curves toward the center of the opening and closing member.

[0026] The lifting and lowering auxiliary groove can be formed in a hairpin structure including an inflow part through which gas flows in and a head part having a spherical shape with a diameter larger than the width of the inflow part.

Advantages of the Invention

[0027] The vent seal cap for a secondary battery according to the present invention and the secondary battery including the same include a main body having a hollow formed therein, an intake port provided in the main body, an exhaust port provided in the main body above the position where the intake port is provided, and an opening / closing member provided in the internal hollow of the main body that opens or closes the connection between the intake port and the exhaust port while moving according to a pressure change of the intake port. Thereby, after discharging the gas generated inside the secondary battery to the outside, it is possible to prevent oxygen from flowing back in the reverse direction, prevent ignition of the secondary battery, and improve safety.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0029] In the following, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention can be realized in various different forms and is not limited or restricted by the following embodiments.

[0030] To clearly explain the present invention, a detailed description of parts not related to the explanation or related known technologies that may obscure the gist of the present invention is omitted. When adding reference signs to the components of each drawing in this specification, the same or similar reference signs shall be given to the same or similar components throughout the specification.

[0031] Also, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. The inventor should interpret them in accordance with the meaning and concept consistent with the technical idea of the present invention, following the principle that the inventor can appropriately define the concept of the terms in order to explain his invention in the best way.

[0032] Embodiment 1 FIG. 1 is a side sectional view showing a vent seal cap for a secondary battery according to Embodiment 1 of the present invention. FIG. 2 is a view showing the process in which a vent is generated in the vent seal cap for a secondary battery according to Embodiment 1 of the present invention. FIG. 3 is a sectional view showing a cross-section AA' cut in the vent seal cap for a secondary battery of FIG. 1.

[0033] Referring to FIG. 1, a vent seal cap 1 for a secondary battery according to Embodiment 1 of the present invention includes a main body 110, an intake port 120, an exhaust port 130, and an opening / closing member 140. The vent seal cap 1 for a secondary battery according to the present invention can be provided in the battery case of the secondary battery (see FIG. 7), and in this case, it can serve to discharge the gas inside the battery case to the outside.

[0034] The main body 110 of the vent seal cap 1 for a secondary battery has a hollow formed inside. The main body 110 is provided with an air inlet 120 and an exhaust port 130, and the exhaust port 130 is provided above the position where the air inlet 120 is provided in the main body 110. The air inlet 120 is connected to the inside of the battery case so that air flows into the inside of the main body 110 in the battery case of the secondary battery, and the exhaust port 130 allows the air that has flowed into the air inlet 120 to flow out through the exhaust port 130 after passing through the main body 110.

[0035] Referring to FIG. 2, the opening and closing member 140 of the vent seal cap 1 for a secondary battery according to Embodiment 1 of the present invention is provided in the internal hollow of the main body 110, and while moving in the hollow interior due to the pressure change at the air inlet 120, it opens or closes the connection between the air inlet 120 and the exhaust port 130. Here, opening the connection between the air inlet 120 and the exhaust port 130 means that the opening and closing member 140 moves to the upper part of the main body 110 and the air flow between the air inlet 120 and the exhaust port 130 is opened (see FIG. 2(c)), and closing the connection between the air inlet 120 and the exhaust port 130 means that the opening and closing member 140 is provided at a position between the air inlet 120 and the exhaust port 130 in the internal hollow of the main body 110 so as to block the air flow between the air inlet 120 and the exhaust port 130 (see FIGS. 2(a) and 2(b)).

[0036] Thus, when gas is generated inside the secondary battery and the internal pressure increases, the vent seal cap 1 for a secondary battery according to Embodiment 1 of the present invention discharges the gas generated inside to the outside, and when the pressure decreases due to the discharge of the gas, it is closed to prevent air from flowing in reverse. Thereby, it is possible to prevent oxygen from reacting inside the battery and causing ignition or explosion, and to improve the safety of the battery.

[0037] Hereinafter, with reference to FIGS. 1 and 2, each configuration of the main body 110, the air inlet 120, the exhaust port 130, and the opening and closing member 140 will be described in detail.

[0038] As shown in FIG. 1, the main body 110 can be formed in a columnar shape having a height and can be formed hollow so that fluid can move inside. Also, an opening / closing member 140 described later can be inserted into the internal hollow.

[0039] The lateral cross-section of the main body 110 can be formed in a polygon or may be circular. When the lateral cross-section of the main body 110 is formed in a circular shape in this way, a spiral guide groove can be formed on the inner peripheral surface of the main body 110, and a guide protrusion formed on the opening / closing member 140 described later is inserted into the guide groove of the main body 110, and the opening / closing member 140 can move up and down while rotating. In this way, due to the spiral guide groove formed on the inner peripheral surface of the main body 110 and the spiral guide protrusion formed on the outer peripheral surface of the opening / closing member 140, the opening / closing member 140 can move up and down by the pressure of the intake port 120 in a state where the sealing force is improved, and can also be utilized as a means for adjusting the vent generation pressure as necessary.

[0040] The intake port 120 is provided in the main body 110, and in particular, can be provided on the side surface of the main body 110. Since the vent seal cap 1 for a secondary battery according to the present invention has a structure that utilizes the self-weight of the opening / closing member 140 provided inside the main body 110, it must be provided in a state where the main body 110 is always standing under the influence of gravity. When the intake port 120 is provided on the lower surface of the main body 110, the main body 110 of the vent seal cap 1 may not be able to be provided in a standing state depending on the form in which the secondary battery is placed and the position where the vent seal cap 1 is provided in the battery case.

[0041] Therefore, in order to prevent this, the intake port 120 can be provided on the side surface of the main body 110, and as a result, regardless of the form in which the secondary battery is placed or the position where the vent seal cap 1 is provided in the battery case, the main body 110 of the vent seal cap 1 can be provided in a state where it is standing under the influence of gravity. Thereby, the opening and closing functions by the opening / closing member 140 of the present invention can be normally performed.

[0042] The intake port 120 can be in a form where a hose is connected to the main body 110, and can be configured to flow from the outside to the inside of the main body 110. Therefore, by connecting the intake port 120 to the battery case on the side opposite to the side where the intake port 120 is connected to the main body 110, the gas generated inside the battery case can flow into the inside of the main body 110 through the intake port 120.

[0043] On the other hand, the intake port 120 can include a member that absorbs heat and contracts (hereinafter, "heat-shrinkable member"). Specifically, a heat-shrinkable member can be included in a portion adjacent to the portion provided in the main body 110 at the intake port 120. As a result, after the gas heated inside the battery case moves through the intake port 120, the intake port 120 can contract due to heat to prevent outside air from flowing into the inside of the vent seal cap 1.

[0044] The exhaust port 130 can be provided on the side surface of the main body 110 and can be provided above the position where the intake port 120 is provided. By providing the exhaust port 130 on the side surface of the main body 110 in this way, even if the opening and closing member 140 provided in the hollow interior of the main body 110 rises due to the pressure of the intake port 120, it can be exhausted by being opened without closing the exhaust port 130. In addition, since the exhaust port 130 is provided above the position where the intake port 120 is provided, when the pressure of the intake port 120 increases, a structure can be formed in which the opening and closing member 140 rises to open the exhaust port 130.

[0045] On the other hand, referring to FIG. 3, based on the lateral cross-section of the main body 110, the exhaust port 130 can be provided on an axis different from the axis on which the intake port 120 is provided. In this way, when the axes of the intake port 120 and the exhaust port 130 are offset, after the gas is exhausted or flows out to the exhaust port 130 of the vent seal cap 1, the reverse inflow can be minimized. However, the intake port 120 and the exhaust port 130 are not necessarily limited to being provided on different axes, and may be provided on the same axis.

[0046] On the one hand, the exhaust port 130 can include an alarm generation device that detects the gas flow and generates a signal. The alarm generation device can include various devices that generate sound signals, visual signals, etc., and can be a device commonly used in the industry. For example, the sound signal is one that generates an alarm sound, and the visual signal can be a signal indicating that a vent has occurred on the vent seal cap 1, or on the instrument panel of an automobile provided with a battery module, a pack, or a battery connected thereto.

[0047] Next, with reference to FIGS. 1 and 2, the opening and closing member 140 will be described in detail.

[0048] The opening and closing member 140 is provided in the internal hollow of the main body 110, and can be a member formed of metal, for example, like a weight having sufficient weight. In this way, the opening and closing member 140 has its own weight, and can open or close the connection between the intake port 120 and the exhaust port 130 while moving in the internal hollow of the main body 110 due to the pressure change of the intake port 120.

[0049] When the pressure of the intake port 120 is greater than a preset value, the opening and closing member 140 can open the connection between the intake port 120 and the exhaust port 130, and when the pressure of the intake port 120 is less than the preset value, the opening and closing member 140 can close the connection between the intake port 120 and the exhaust port 130.

[0050] Here, the preset value is the value obtained by dividing the weight of the opening and closing member 140 by the unit area of the opening and closing member 140, and the pressure magnitude formed in the volume of the space located in the upper part of the hollow of the main body 110 sealed by the opening and closing member 140 in a state where the lower surface position of the opening and closing member 140 coincides with the lower surface position of the exhaust port 130 when the opening and closing member 140 rises in the internal hollow of the main body 110.

[0051] In the opening and closing member 140 of the vent seal cap 1 for a secondary battery according to the present invention, a lifting auxiliary groove 141 can be formed which is open in the direction in which gas flows in through the intake port 120 and is recessed toward the center of the opening and closing member 140. In this way, when the lifting auxiliary groove 141 is formed in the center of the opening and closing member 140, the area receiving the upward force increases, so that the opening and closing member 140 can more easily rise in the internal hollow of the main body 110, and the opening and closing member 140 can rise even due to a small internal pressure or a pressure change at the intake port 120 to generate a vent.

[0052] In particular, the lifting auxiliary groove 141 is formed in a hairpin structure including an inflow portion into which gas flows and a head portion having a spherical shape with a diameter larger than the width of the inflow portion, and the head portion can increase the area receiving the upward pressure.

[0053] In addition, as described above, the opening and closing member 140 can have spiral guide protrusions formed on its outer peripheral surface, and the guide protrusions are inserted into the guide grooves of the main body 110, so that the opening and closing member 140 can move up and down while rotating. In this way, due to the spiral guide grooves formed on the inner peripheral surface of the main body 110 and the spiral guide protrusions formed on the outer peripheral surface of the opening and closing member 140, the opening and closing member 140 can move up and down by the pressure at the intake port 120 with improved sealing force, and can also be utilized as a means for adjusting the vent generation pressure as needed.

[0054] On the other hand, the above-mentioned vent seal cap 1 for a secondary battery can be made of various materials. Specifically, the main body 110, the intake port 120, the exhaust port 130, or the opening and closing member 140 of the vent seal cap 1 for a secondary battery can be made of various materials.

[0055] At that time, at least one of the main body 110, the intake port 120, the exhaust port 130, or the opening and closing member 140 is preferably made of a high heat-resistant material so that mechanical or chemical deformation does not occur and the physical properties do not significantly deteriorate even when high-temperature gas is released from the inside of the secondary battery.

[0056] Further, at least one of the main body 110, the intake port 120, the exhaust port 130, or the opening / closing member 140 may burst and deform when the internal gas pressure is equal to or higher than a predetermined pressure. Therefore, it is preferably made of a material that can withstand the predetermined pressure. Here, the predetermined pressure may be various pressure values. For example, it may be 7 bar or higher.

[0057] That is, the material of the main body 110, the intake port 120, the exhaust port 130, or the opening / closing member 140 can be any material as long as it satisfies any one of the above conditions. For example, the material of at least one of the main body 110, the intake port 120, the exhaust port 130, and the opening / closing member 140 may include PPS (Poly Phenylene Sulfide) or PI (Poly Imide) of high heat-resistant plastics, or may include Al (Aluminium) or SUS (Stainless steel) of a metal material.

[0058] Embodiment 2 FIG. 4 is a side cross-sectional view showing a vent seal cap for a secondary battery according to Embodiment 2 of the present invention. FIG. 5 is a diagram showing a process in which a vent is generated in the vent seal cap for a secondary battery according to Embodiment 2 of the present invention. FIG. 6 is a side cross-sectional view showing a configuration in which an intake port is formed on a lower surface of a stopper portion in the vent seal cap for a secondary battery according to Embodiment 2 of the present invention.

[0059] In Embodiment 2 of the present invention, the main body 210 includes a moving portion 211 and a stopper portion 212, which is different from Embodiment 1.

[0060] The content common to Embodiment 1 will be omitted as much as possible, and Embodiment 2 will be described centering on the differences. That is, when the content not described in Embodiment 2 is necessary, it is obvious that the content of Embodiment 1 can be used.

[0061] Referring to FIG. 4, the main body 210 of the vent seal cap for a secondary battery according to Embodiment 2 of the present invention includes a moving portion 211 and a stopper portion 212.

[0062] The moving part 211 is formed such that the hollow cross-sectional area of the main body 210 is equal to the lateral cross-sectional area of the opening / closing member 240, and the opening / closing member 240 can move in a state where the hollow is sealed. The stopping part 212 is provided so as to be connected to the lower part of the moving part 211, and is formed such that the hollow cross-sectional area is smaller than the lateral cross-section of the opening / closing member 240, and can prevent the opening / closing member 240 from moving downward due to its own weight, thereby preventing it from being placed on the bottom surface of the main body 210.

[0063] On the other hand, the stopping part 212 is formed such that the hollow cross-sectional area is smaller than the lateral cross-section of the opening / closing member 240, forms a right angle with the moving part 211, and is provided with a step remaining, or the upper side area connected to the moving part 211 is the same as that of the moving part 211, and can be provided in a form where the area decreases as it goes to the lower side.

[0064] The exhaust port 230 according to Embodiment 2 of the present invention can be formed on the side surface of the moving part 211, and the intake port 220 can be formed on the side surface of the stopping part 212. Further, as shown in FIG. 6, the exhaust port 230 can be formed on the side surface of the moving part 211, and the intake port 220 can be formed on the lower surface of the stopping part 212. Thus, when the intake port 220 is formed on the lower surface of the stopping part 212, the opening / closing member 240 can rise more easily when gas flows in from the intake port 220.

[0065] In the vent seal cap for a secondary battery according to Embodiment 2 of the present invention, the process in which a vent is generated by opening or closing the connection between the intake port 220 and the exhaust port 230 due to the lifting of the opening / closing member 240 is illustrated in FIG. 5, and this can be understood to be the same as the operation in Embodiment 1.

[0066] Embodiment 3 FIG. 7 is a diagram illustrating a secondary battery according to Embodiment 3 of the present invention.

[0067] In Embodiment 3 of the present invention, it is different from Embodiments 1 and 2 in that it is an invention related to the secondary battery 2 including the vent seal cap 1 for the secondary battery of Embodiment 1 or Embodiment 2.

[0068] The content common to Embodiments 1 and 2 will be omitted as much as possible, and Embodiment 3 will be described centering on the differences. That is, when the content not described in Embodiment 3 is necessary, it is obvious that the content of Embodiments 1 and 2 can be used for correspondence.

[0069] Referring to FIG. 7, the secondary battery 2 according to Embodiment 3 of the present invention includes an electrode assembly, a battery case, and a vent seal cap.

[0070] The electrode assembly is formed by laminating a positive electrode, a separator, a negative electrode, and a separator, and can be a jelly-roll type formed by winding a long sheet shape, a stack type in which unit cells cut into a certain size are laminated, or a stack folding type in which unit cells are laminated and the separator is folded.

[0071] The battery case only needs to be one in which the electrode assembly is housed inside, and for example, any one of a can type and a pouch type including a cylindrical shape or a rectangular shape can be selected.

[0072] The vent seal cap 1 is provided on the battery case. For example, in the case of a pouch type, it can be provided at the seal part and serve as a vent. The main body 310 of the vent seal cap has a hollow formed inside. The main body 310 is provided with an air inlet 320 and an exhaust port 330, and the exhaust port 330 is provided above the position where the air inlet 320 is provided in the main body 310. The air inlet 320 is connected to the inside of the battery case so that gas flows into the inside of the main body 310 in the battery case, and the exhaust port 330 allows the gas flowing in from the air inlet 320 to flow out through the exhaust port 330 after passing through the main body 310.

[0073] The opening and closing member 340 of the vent seal cap is provided inside the hollow of the main body 310, and while moving inside the hollow due to the pressure change at the intake port 320, it opens or closes the connection between the intake port 320 and the exhaust port 330. Here, opening the connection between the intake port 320 and the exhaust port 330 means that the opening and closing member 340 moves to the upper part of the main body 310, the gas flow between the intake port 320 and the exhaust port 330 is opened, the gas in the battery case flows into the inside of the vent seal cap through the intake port 320, and flows out through the exhaust port 330, which means that a vent is generated. Also, closing the connection between the intake port 320 and the exhaust port 330 means that the opening and closing member 340 is provided at a position between the intake port 320 and the exhaust port 330 in the hollow inside the main body 310 so as to block the gas flow between the intake port 320 and the exhaust port 330.

[0074] Thus, the secondary battery according to Embodiment 3 of the present invention includes a vent seal cap, so that when gas is generated inside the battery case and the internal pressure increases, the gas generated inside the battery case is discharged to the outside of the battery case, and when the pressure decreases due to gas discharge, it is closed, thereby preventing air from flowing in reversely. Thereby, it is possible to prevent oxygen from reacting inside the battery case and causing ignition or explosion of the secondary battery, and improve the safety of the secondary battery.

[0075] The main body 310, the intake port 320, and the exhaust port 330, which are other configurations of Embodiment 3 of the present invention, can be understood to be the same as the descriptions in Embodiments 1 and 2.

[0076] The opening and closing member can be formed with a lifting and lowering auxiliary groove that is open in the direction in which gas flows in through the intake port and curves toward the center of the opening and closing member. Also, the lifting and lowering auxiliary groove can be formed in a hairpin structure including an inflow portion where gas flows in and a head portion having a spherical shape with a diameter larger than the width of the inflow portion.

[0077] In the above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible by those having ordinary knowledge in the technical field to which the present invention pertains within the equivalent scope of the technical idea of the present invention and the claims described below.

Explanation of Reference Signs

[0078] 1: Vent seal cap for secondary battery 110: Body 120: Intake port 130: Exhaust port 140: Opening / closing member 141: Lifting auxiliary groove 210: Body 211: Moving part 212: Stopping part 220: Intake port 230: Exhaust port 240: Opening / closing member 310: Body 320: Intake port 330: Exhaust port 340: Opening / closing member 2: Secondary battery

Claims

1. A main body with a hollow formed inside, An air inlet provided in the main body, An exhaust port provided in the main body above the position where the air inlet is provided, An opening and closing member provided in the internal hollow of the main body, which opens or closes the connection between the air inlet and the exhaust port while moving due to the pressure change of the air inlet, and The opening and closing member is An air vent seal cap for a secondary battery, characterized in that it is opened in the direction in which gas flows in through the air inlet, and a lifting auxiliary groove is formed in a shape that curves toward the center of the opening and closing member.

2. The air inlet is The air vent seal cap for a secondary battery according to Claim 1, characterized in that it is provided on the side surface of the main body.

3. The exhaust port is Provided on the side surface of the main body, The air vent seal cap for a secondary battery according to Claim 2, characterized in that it is provided on an axis different from the axis where the air inlet is provided, based on the lateral cross-section of the main body.

4. The opening and closing member is When the pressure of the air inlet is greater than a preset value, it opens the connection between the air inlet and the exhaust port, The air vent seal cap for a secondary battery according to Claim 1, characterized in that when the pressure of the air inlet is less than the preset value, it closes the connection between the air inlet and the exhaust port.

5. The lifting auxiliary groove is The air vent seal cap for a secondary battery according to Claim 1, characterized in that it is formed in a hairpin structure including an inflow portion where gas flows in and a head portion having a spherical shape with a diameter larger than the width of the inflow portion.

6. The main body is The air vent seal cap for a secondary battery according to Claim 1, characterized in that the lateral cross-section is circular.

7. A main body with a hollow formed inside, An air inlet provided in the main body, An exhaust port provided in the main body above the position where the air inlet is provided, An opening and closing member provided in the internal hollow of the main body, which opens or closes the connection between the air inlet and the exhaust port while moving due to the pressure change of the air inlet, and The main body is The lateral cross-section is circular, The main body is An air vent seal cap for a secondary battery, characterized in that a spiral guide groove is formed on the inner peripheral surface.

8. The opening and closing member is A spiral guide protrusion is formed on the outer peripheral surface, The air vent seal cap for a secondary battery according to Claim 7, characterized in that the guide protrusion is inserted into the guide groove of the main body and moves up and down.

9. A main body with a hollow formed inside, An air inlet provided in the main body, An exhaust port provided in the main body above the position where the air inlet is provided, An opening / closing member provided in the internal hollow of the main body, which opens or closes the connection between the air inlet and the exhaust port while moving according to the pressure change of the air inlet, and The air inlet, A vent seal cap for a secondary battery, characterized in that it includes a member that absorbs heat and contracts.

10. A main body with a hollow formed inside, An air inlet provided in the main body, An exhaust port provided in the main body above the position where the air inlet is provided, An opening / closing member provided in the internal hollow of the main body, which opens or closes the connection between the air inlet and the exhaust port while moving according to the pressure change of the air inlet, and The exhaust port, The vent seal cap for a secondary battery according to the description, characterized in that it includes an alarm generation device that detects the flow of gas and generates a signal.

11. A main body with a hollow formed inside, An air inlet provided in the main body, An exhaust port provided in the main body above the position where the air inlet is provided, An opening / closing member provided in the internal hollow of the main body, which opens or closes the connection between the air inlet and the exhaust port while moving according to the pressure change of the air inlet, and The main body, A moving part formed such that the cross-sectional area of the hollow is equal to the lateral cross-sectional area of the opening / closing member, and the opening / closing member can move in a state of sealing the hollow, and A stopping part provided below the moving part, formed such that the cross-sectional area of the hollow is smaller than the lateral cross-section of the opening / closing member, and preventing the movement of the opening / closing member, and is characterized by a vent seal cap for a secondary battery.

12. The exhaust port, Is formed on the side surface of the moving part, The air inlet, The vent seal cap for a secondary battery according to claim 11, characterized in that it is formed on the side surface of the stopping part.

13. The exhaust port, Is formed on the side surface of the moving part, The air inlet, The vent seal cap for a secondary battery according to claim 11, characterized in that it is formed on the lower surface of the stopping part.

14. The material of at least any one of the main body, the intake port, the exhaust port, and the opening / closing member includes at least any one of PPS (Poly Phenylene Sulfide), PI (Poly Imide), Al (Aluminum), and SUS (Stainless steel). The vent seal cap for a secondary battery according to claim 1.

15. A positive electrode, a separator, a negative electrode, an electrode assembly in which the separators are laminated, A battery case in which the electrode assembly is housed inside, A vent seal cap provided in the battery case, and includes: The vent seal cap includes: A main body having a hollow formed inside, An intake port provided in the main body, An exhaust port provided in the main body above the position where the intake port is provided, An opening / closing member provided in the internal hollow of the main body, which opens or closes the connection between the intake port and the exhaust port while moving due to the pressure difference between the intake port and the exhaust port. The opening / closing member includes: A secondary battery characterized in that it is opened in the direction in which gas flows in through the intake port, and a lifting auxiliary groove having a shape that curves toward the center of the opening / closing member is formed.

16. The lifting auxiliary groove includes: A secondary battery according to claim 15, characterized in that it is formed in a hairpin structure including an inflow portion into which gas flows and a head portion having a spherical shape with a diameter larger than the width of the inflow portion.

17. The material of at least any one of the main body, the intake port, the exhaust port, and the opening / closing member includes at least any one of PPS (Poly Phenylene Sulfide), PI (Poly Imide), Al (Aluminum), and SUS (Stainless steel). The secondary battery according to claim 15.

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