Explosion-proof valve patch, cover plate assembly, battery cell, battery and electric device

Abstract

The embodiments of the present disclosure belong to the technical field of batteries. Provided are an explosion-proof valve patch, a cover plate assembly, a battery cell, a battery and an electric device. The explosion-proof valve patch comprises a patch body; a first rubber ring arranged on a first surface of the patch body and provided with a first gap; and a second rubber ring arranged on the first surface of the patch body, located on the inner side of the first rubber ring and provided with a second gap, the first gap and the second gap being staggered.

Description

Explosion-proof valve patches, cover plate assemblies, battery cells, batteries, and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on the Chinese patent application with application number: 202322899162.0 and application date of October 27, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to an explosion-proof valve patch, a cover plate assembly, a battery cell, a battery, and an electrical device. Background Art

[0004] Typically, batteries require an explosion-proof valve patch to protect the valve. This patch has an exhaust channel. After a battery drop test, the liquid inside the battery cell could leak through this channel, posing a safety hazard.

[0005] Summary of the Invention

[0006] The present disclosure provides an explosion-proof valve patch, a cover plate assembly, a battery cell, a battery, and an electrical device to solve the technical problem that the liquid inside the battery cell is easily leaked through the exhaust channel of the explosion-proof valve patch after a battery drop test, thereby improving safety performance.

[0007] In a first aspect, an embodiment of the present disclosure provides an explosion-proof valve patch, comprising:

[0008] Patch body;

[0009] A first rubber ring, the first rubber ring is provided on the first surface of the patch body, and the first rubber ring has a first notch;

[0010] The second rubber ring is provided on the first surface of the patch body and is located inside the first rubber ring. The second rubber ring is provided with a second notch, and the first notch and the second notch are staggered.

[0011] In the above technical solution, by arranging the first rubber ring and the second rubber ring on the patch body and staggering the gaps of the two rubber rings, when the patch body is installed on the cover, the inner and outer sides of the patch body can be connected, ensuring the balance of the internal and external pressure differences, improving the stability of the battery, and during the drop test, the electrolyte is not easy to flow out from the gap, thereby improving the safety performance.

[0012] In some embodiments, the second notch is located on the second rubber ring at a position away from the first notch.

[0013] In the above technical solution, by extending the communication channel between the first notch and the second notch, the isolation effect on the liquid is improved.

[0014] In some embodiments, the patch body includes:

[0015] A main body, wherein the second rubber ring is provided on the main body;

[0016] Side edges, the side edges surround the main body and are connected to the main body by bending;

[0017] The flange is connected to an end of the side edge facing away from the main board body, and the first rubber ring is arranged on the flange.

[0018] In the above technical solution, the patch body includes a main body, side edges and flanges. By arranging two rubber rings on the main body and flanges respectively, the two rubber rings can be connected to the cover plate and the boss respectively, thereby improving the isolation effect on liquids.

[0019] In some embodiments, the outer edge of the second rubber ring is spaced apart from the side edge.

[0020] In the above technical solution, the ventilation effect between the first rubber ring and the second rubber ring is improved by setting the outer edge of the second rubber ring and the side edge at a distance.

[0021] In some embodiments, the thickness H1 of the first rubber ring and the thickness H2 of the second rubber ring satisfy:

[0022] 0.075mm≤H1≤0.1mm, 0.075mm≤H2≤0.1mm.

[0023] In the above technical solution, by limiting the thickness of the first rubber ring and the second rubber ring, the bonding strength is ensured while controlling the cost.

[0024] In some embodiments, the width of the first notch is smaller than the width of the second notch.

[0025] In the above technical solution, the width of the second notch is larger, and is used to align with the groove on the boss to ensure exhaust. The first notch is smaller, and is used to ensure ventilation while preventing liquid from overflowing.

[0026] In some embodiments, the width W1 of the first notch and the width W2 of the second notch satisfy:

[0027] 0.8mm≤W1≤1mm, 3mm≤W2≤4mm.

[0028] In the above technical solution, by limiting the width range of the first notch and the second notch, installation is facilitated while the ventilation and leakage prevention effects are better.

[0029] In some embodiments, a radial width of the first rubber ring is smaller than a radial width of the second rubber ring.

[0030] In the above technical solution, the first rubber ring has a smaller radial width, which saves material costs and ensures that the first rubber ring fits the cover plate surface. The second rubber ring has a larger radial width, which makes it easier for the second rubber ring to fully cover the boss, improve the fit and facilitate installation.

[0031] In some embodiments, the radial width W3 of the first rubber ring and the radial width W4 of the second rubber ring satisfy:

[0032] 0.5mm≤W3≤1mm, 3mm≤W4≤5mm.

[0033] In the above technical solution, by limiting the radial width range of the first rubber ring and the second rubber ring, installation is facilitated, material is saved, and the ventilation and leakage prevention effects are better.

[0034] In a second aspect, an embodiment of the present disclosure provides a cover plate assembly, comprising:

[0035] A cover plate, wherein the cover plate is provided with a mounting hole and a boss surrounding the mounting hole, and the boss is provided with an opening;

[0036] an explosion-proof valve, the explosion-proof valve being installed in the installation hole;

[0037] As in the explosion-proof valve patch described in any of the above embodiments, the first rubber ring of the explosion-proof valve patch is in contact with the cover plate and is located outside the boss, and the second rubber ring of the explosion-proof valve patch is in contact with the boss.

[0038] In the above technical solution, an explosion-proof valve patch is provided, a first rubber ring and a second rubber ring are provided on the patch body, and the gaps of the two rubber rings are staggered, so that when the patch body is installed on the cover, the inner and outer sides of the patch body can be connected to ensure the balance of the internal and external pressure differences, and during the drop test, the electrolyte is not easy to flow out from the gap, thereby improving the safety performance.

[0039] In some embodiments, the radial width of the second rubber ring is not less than the width of the boss.

[0040] In the above technical solution, the radial width of the second rubber ring is set to be not less than the width of the boss, so that the second rubber ring and the boss can be fitted together to ensure sealing of the remaining parts except the boss opening.

[0041] In some embodiments, the distance M1 between the inner ring of the second rubber ring and the inner ring of the boss satisfies:

[0042] 3mm≤M1≤4mm.

[0043] In the above technical solution, the spacing between the inner ring of the second rubber ring and the inner ring of the boss is limited to ensure the sealing effect of the second rubber ring on the boss and avoid leakage from other parts outside the opening.

[0044] In a third aspect, an embodiment of the present disclosure provides a battery cell, comprising: a cover plate assembly as described in any of the above embodiments.

[0045] In the above technical solution, the cover assembly includes an explosion-proof valve patch, and a first rubber ring and a second rubber ring are arranged on the patch body, and the gaps of the two rubber rings are staggered, so that when the patch body is installed on the cover, the inner and outer sides of the patch body can be connected to ensure the balance of the internal and external pressure differences, and during the drop test, the electrolyte is not easy to flow out from the gap, thereby improving the safety performance.

[0046] In a fourth aspect, an embodiment of the present disclosure provides a battery, comprising: a plurality of battery cells as described in the above embodiments.

[0047] In the above technical solution, the capacity of the battery is increased by providing multiple battery cells, and an explosion-proof valve patch is provided on the battery cell, and a first rubber ring and a second rubber ring are provided on the patch body, and the gaps of the two rubber rings are staggered. When the patch body is installed on the cover, the inner and outer sides of the patch body can be connected to ensure the balance of the internal and external pressure differences, and during the drop test, the electrolyte is not easy to flow out from the gap, thereby improving the safety performance.

[0048] In a fifth aspect, an embodiment of the present disclosure provides an electrical device, comprising: a battery as described in the above embodiment, wherein the battery is used to provide electrical energy to the electrical device.

[0049] In the above technical solution, an explosion-proof valve patch is provided on the battery cell of the battery, a first rubber ring and a second rubber ring are provided on the patch body, and the gaps of the two rubber rings are staggered. When the patch body is installed on the cover, the inner and outer sides of the patch body can be connected to ensure the balance of the internal and external pressure differences. In addition, during the drop test, the electrolyte is not easy to flow out from the gap, thereby improving the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0051] FIG1 is a schematic structural diagram of a vehicle provided by some embodiments of the present disclosure;

[0052] FIG2 is an exploded view of a battery structure provided by some embodiments of the present disclosure;

[0053] FIG3 is one of the structural schematic diagrams of a battery cell provided in some embodiments of the present disclosure;

[0054] FIG4 is a schematic cross-sectional view of a battery cell according to some embodiments of the present disclosure;

[0055] Figure 5 is an enlarged view of point A in Figure 4;

[0056] Figure 6 is an enlarged view of point B in Figure 4;

[0057] FIG7 is one of the structural schematic diagrams of the explosion-proof valve patch provided in some embodiments of the present disclosure.

[0058] Reference numerals:

[0059] Vehicle 1, battery 10, motor 20, controller 30;

[0060] Box body 11, first box body 111, second box body 112, battery cell 12, shell 121, cover assembly 122, cover 1221, boss 12211, opening 12212, pole 1222, battery cell 124;

[0061] Explosion-proof valve patch 123, patch body 1231, main body 12311, side 12312, flange 12313, first rubber ring 1232, first notch 12321, second rubber ring 1233, second notch 12331. DETAILED DESCRIPTION

[0062] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0063] Unless otherwise defined, all technical and scientific terms used in this disclosure have the same meanings as commonly understood by those skilled in the art to which this disclosure belongs. The terms used in the specification and application of this disclosure are only for the purpose of describing specific embodiments and are not intended to limit this disclosure. The terms "including" and "having" and any variations thereof in the specification and claims of this disclosure and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this disclosure or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0064] References to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this disclosure may be combined with other embodiments.

[0065] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0066] The term "and / or" in this disclosure simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this disclosure generally indicates that the related objects are in an "or" relationship.

[0067] The term "multiple" used in this disclosure refers to more than two (including two). Similarly, "multiple groups" refers to more than two (including two) groups, and "multiple sheets" refers to more than two (including two) sheets.

[0068] The battery cells mentioned in the embodiments of the present disclosure may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the embodiments of the present disclosure are not limited to this. The battery cells may be cylindrical, flat, rectangular, or other shapes, and the embodiments of the present disclosure are not limited to this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of the present disclosure are not limited to this.

[0069] The battery referred to in the embodiments of this disclosure refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this disclosure may include a battery module or battery pack. Batteries generally include a housing for enclosing one or more battery cells or multiple battery modules. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0070] A battery cell includes a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0071] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present disclosure are not limited thereto.

[0072] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and important role. A battery consists of a housing and multiple cells housed within it. As a core component in new energy vehicles, batteries have high requirements for both safety and cycle life.

[0073] The inventors discovered that in general power batteries, in order to avoid explosions caused by thermal runaway of the battery, an explosion-proof valve is usually installed on the battery. The structural strength of the explosion-proof valve is weaker than the strength of the battery shell. When the battery experiences thermal runaway, the explosion-proof valve opens first to discharge gas. In order to prevent the explosion-proof valve from opening due to external collisions, an explosion-proof valve patch needs to be installed outside the explosion-proof valve to provide a certain degree of protection for the explosion-proof valve, and the explosion-proof valve patch has an exhaust channel to balance the pressure inside and outside the explosion-proof valve patch under normal circumstances. However, in the battery drop test, the explosion-proof valve may crack after the battery is impacted, and the liquid inside the battery cell may leak through the exhaust channel of the explosion-proof valve patch, causing certain safety hazards to the battery after the collision.

[0074] Based on the above considerations, in order to solve the technical problem that the liquid inside the battery cell is easily leaked through the exhaust channel of the explosion-proof valve patch after the battery drop test, the present invention designs an explosion-proof valve patch, including a patch body, a first rubber ring and a second rubber ring. The first rubber ring is arranged on the first side of the patch body, and the first rubber ring is provided with a first notch. The second rubber ring is arranged on the first side of the patch body and is located on the inner side of the first rubber ring. The second rubber ring is provided with a second notch, and the first notch and the second notch are staggered.

[0075] In the explosion-proof valve patch of this structure, by arranging the first rubber ring and the second rubber ring on the patch body and staggering the notches of the two rubber rings, when the patch body is installed on the cover plate, the inner and outer sides of the patch body can be connected through the gap and the notch between the rubber rings, thereby ensuring the balance of the internal and external pressure differences. After the drop test, the electrolyte cannot flow out directly due to the sealing achieved at the positions of the first rubber ring and the second rubber ring. Since the first notch and the second notch are staggered, a narrow gap is formed between the inside of the battery and the outside between the first rubber ring and the second rubber ring. In this narrow gap, the resistance to the circulation of the electrolyte is relatively large, making it difficult for the electrolyte to flow out from the first notch, thereby improving safety performance.

[0076] The batteries disclosed in the embodiments of the present disclosure can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery thermal management system disclosed herein and batteries can be used to form the electrical device. This helps expand the scope of application of the battery thermal management system and reduces the difficulty of assembly.

[0077] The embodiments of the present disclosure provide an electric device using a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0078] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device according to an embodiment of the present disclosure.

[0079] As shown in Figure 1, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present disclosure. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 20, a controller 30 and a battery 10 can be set inside the vehicle 1. The controller 30 is used to control the battery 10 to power the motor 20. For example, a battery 10 can be set at the bottom, front or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1. For example, the battery 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present disclosure, the battery 10 can not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0080] In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells 12 , wherein the plurality of battery cells 12 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.

[0081] FIG2 is an exploded view of the structure of a battery 10 according to an embodiment of the present disclosure. The battery 10 includes a housing 11 and a plurality of battery cells 12, which are intended to be housed within the housing 11. The housing 11 is configured to provide assembly space for the battery cells 12 and can have a variety of structures. In some embodiments, the housing 11 can include a first housing body 111 and a second housing body 112, which overlap each other and together define an assembly space for accommodating the battery cells 12. The second housing body 112 can be a hollow structure with one end open. The first housing body 111 can be a plate-like structure, with the first housing body 111 overlapping the open side of the second housing body 112, so that the first housing body 111 and the second housing body 112 jointly define an assembly space. Alternatively, the first housing body 111 and the second housing body 112 can each be a hollow structure with one end open, with the open side of the first housing body 111 overlapping the open side of the second housing body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0082] In the battery 10, the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections among the multiple battery cells 12. The multiple battery cells 12 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure of the multiple battery cells 12 is housed within the housing 11. Alternatively, the battery 10 can be constructed by first connecting multiple battery cells 12 in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single structure housed within the housing 11. The battery 10 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 12.

[0083] Each battery cell 12 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 12 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG3 , the battery cell 12 is in the shape of a rectangular parallelepiped.

[0084] According to some embodiments of the present disclosure, as shown in Figures 3 and 4, the present disclosure further provides a battery cell 12. The battery cell 12 may include a housing 121, a battery cell 124, and a cover assembly 122. One end of the housing 121 may be provided with an opening for mounting the battery cell 124. The battery cell 124 is disposed within the housing 121, which protects the battery cell 124. The cover assembly 122 may be provided over the opening of the housing 121 to define a sealed space together with the housing 121, isolating the battery cell 124 from the outside world.

[0085] The cover plate assembly 122 may be provided with a pole 1222 , and the pole 1222 is used to connect to the tab of the battery cell 124 so that the battery cell 124 can be electrically connected to the outside world.

[0086] According to some embodiments of the present disclosure, as shown in FIG. 4 to FIG. 7 , the present disclosure further provides a cover plate assembly 122 . The cover plate assembly 122 may include a cover plate 1221 , an explosion-proof valve, and an explosion-proof valve patch 123 .

[0087] The cover plate 1221 may be provided with a mounting hole and a boss 12211 surrounding the mounting hole. The boss 12211 is provided with an opening 12212 . The explosion-proof valve may be installed in the mounting hole.

[0088] The mounting hole can connect the inside and outside of the cover plate 1221. The explosion-proof valve is installed in the mounting hole to seal the mounting hole. When the internal pressure of the battery cell 12 is high, the explosion-proof valve opens to release pressure, preventing the external structure of the battery cell 12 from cracking and exploding. The boss 12211 can be set on the outside of the cover plate 1221, that is, on the side of the cover plate 1221 facing away from the battery cell 124. The boss 12211 can provide a certain degree of protection for the explosion-proof valve and facilitate the installation of the explosion-proof valve patch 123. The explosion-proof valve patch 123 can be installed on the boss 12211. The explosion-proof valve patch 123 can provide a certain degree of protection for the explosion-proof valve, preventing the explosion-proof valve from rupturing and opening prematurely due to external forces.

[0089] The first rubber ring 1232 of the explosion-proof valve patch 123 is in contact with the cover plate 1221 and is located outside the boss 12211. The second rubber ring 1233 of the explosion-proof valve patch 123 is in contact with the boss 12211. The first rubber ring 1232 is positioned to achieve a seal between the explosion-proof valve patch 123 and the cover plate 1221, and the second rubber ring 1233 is positioned to achieve a seal between the explosion-proof valve patch 123 and the boss 12211. The top surface of the boss 12211 is provided with an opening 12212. After the explosion-proof valve patch 123 is installed, the opening 12212 connects the inside and outside of the boss 12211, allowing the space inside the boss 12211, where the explosion-proof valve is located, to communicate with the outside of the boss 12211. This balances the internal and external pressures of the explosion-proof valve patch 123, improving safety and stability.

[0090] According to some embodiments of the present disclosure, as shown in Figures 5 to 7 , the present disclosure further provides an explosion-proof valve patch 123. The explosion-proof valve patch 123 may include a patch body 1231, a first rubber ring 1232, and a second rubber ring 1233.

[0091] The first rubber ring 1232 may be disposed on the first surface of the patch body 1231 , and the first rubber ring 1232 may be provided with a first notch 12321 .

[0092] The first surface of the patch body 1231 is set toward the cover plate 1221, and the first rubber ring 1232 is set on the first surface of the patch body 1231. When the patch body 1231 is installed on the cover plate 1221, the first rubber ring 1232 is bonded to the outer side surface of the cover plate 1221, and the first rubber ring 1232 is located on the outer side of the boss 12211, so that the position of the boss 12211 is isolated from the outer part of the patch body 1231 by the patch body 1231 and the first rubber ring 1232, and can only be connected to the outside through the first notch 12321 of the first rubber ring 1232.

[0093] The second rubber ring 1233 can be provided on the first surface of the patch body 1231 and can be located inside the first rubber ring 1232 . The second rubber ring 1233 can be provided with a second notch 12331 . The first notch 12321 and the second notch 12331 are staggered.

[0094] The second rubber ring 1233 is also disposed on the first surface of the patch body 1231 and can be disposed inside the first rubber ring 1232. When the explosion-proof valve patch 123 is mounted on the cover plate 1221, the second rubber ring 1233 can fit over the boss 12211, isolating the inside of the boss 12211 from the outside of the boss 12211 via the second rubber ring 1233.

[0095] The second rubber ring 1233 can be provided with a second notch 12331, and the first notch 12321 can be staggered with the second notch 12331. When the second rubber ring 1233 is bonded to the boss 12211, as shown in Figure 6, the second notch 12331 can be directly opposite to the opening 12212 on the boss 12211, so that when the patch body 1231 is pressed and installed on the cover plate 1221, the second rubber ring 1233 will not seal the opening 12212 of the boss 12211, ensuring that the inner side of the boss 12211 can be connected with the outer side of the boss 12211 through the opening 12212, and the inner space of the boss 12211 needs to pass through the gap between the boss 12211 and the first rubber ring 1232 to achieve communication with the outer side of the patch body 1231.

[0096] In actual implementation, a narrow channel is formed between the first rubber ring 1232 and the second rubber ring 1233, with the two ends of the narrow channel being the opening 12212 of the boss 12211 and the first notch 12321, respectively. Gas at the explosion-proof valve location can communicate with the outer space of the boss 12211 through the opening 12212, and the space between the outer side of the boss 12211 and the first rubber ring 1232 can communicate with the outside of the patch body 1231 through the first notch 12321, thereby achieving the effect of balancing the air pressure inside and outside the explosion-proof valve patch 123. Furthermore, during a drop test, some electrolyte may flow out of the explosion-proof valve. After the electrolyte flows into the narrow channel through the opening 12212, due to the surface tension of the liquid's cross-section and the pressure difference between the end of the first notch 12321 and the inner side of the boss 12211, the liquid will be blocked in the narrow channel and unable to flow out of the first notch 12321 through the narrow channel.

[0097] According to the explosion-proof valve patch 123 provided in the embodiment of the present disclosure, by arranging a first rubber ring 1232 and a second rubber ring 1233 on the patch body 1231, and staggering the gaps of the two rubber rings, when the patch body 1231 is installed on the cover 1221, the inner and outer sides of the patch body 1231 can be connected, ensuring the balance of the internal and external pressure differences, improving the stability of the battery 10, and during the drop test, the electrolyte is not easy to flow out from the gap, thereby improving the safety performance.

[0098] According to some embodiments of the present disclosure, as shown in FIG. 7 , the second notch 12331 may be provided on the second rubber ring 1233 at a position away from the first notch 12321 .

[0099] In this embodiment, by arranging the second notch 12331 at a position on the second rubber ring 1233 away from the first notch 12321 , the length of the narrow channel is lengthened, thereby increasing the resistance to electrolyte outflow and improving the isolation effect.

[0100] For example, a general explosion-proof valve can be set in an elongated shape, and accordingly, the boss 12211 can also be set in an elongated shape. In this embodiment, the projection of the patch body 1231 in the thickness direction is also set in an elongated shape. The opening 12212 of the boss 12211 is set at one end in the length direction of the boss 12211, wherein the second notch 12331 and the opening 12212 of the boss 12211 are correspondingly set at one end in the length direction of the patch body 1231, and the first notch 12321 is set at the other end in the length direction of the patch body 1231.

[0101] According to some embodiments of the present disclosure, as shown in FIG. 5 and FIG. 7 , the patch body 1231 may include a main body 12311 , side edges 12312 , and flanges 12313 .

[0102] The second rubber ring 1233 can be arranged on the main body 12311, the side 12312 can surround the main body 12311 and can be bent and connected to the main body 12311, the flange 12313 can be connected to the end of the side 12312 facing away from the main body 12311, and the first rubber ring 1232 is arranged on the flange 12313.

[0103] In this embodiment, the patch body 1231 needs to be installed on the cover plate 1221 and the boss 12211, wherein the main body 12311 of the patch body 1231 is installed on the boss 12211, and the second rubber ring 1233 can be provided on the main body 12311 to bond and seal the main body 12311 and the boss 12211.

[0104] Because boss 12211 protrudes beyond cover plate 1221, there is a certain height difference between main body 12311 and cover plate 1221. Side edge 12312 is provided so that side edge 12312 can surround main body 12311 and bendably connected thereto. Side edge 12312 is bent toward the side of main body 12311 near cover plate 1221. Flange 12313 can be annular, with the inner ring of flange 12313 connected to the end of side edge 12312 facing away from main body 12311. Main body 12311, side edge 12312, and flange 12313 are smoothly connected to form a first surface on the side of patch body 12311 that bends toward side edge 12312. Second rubber ring 1233 is provided on the first surface of main body 12311, and first rubber ring 1232 is provided on the first surface of flange 12313. By providing the side edge 12312 to reduce the distance between the flange 12313 and the cover plate 1221 , and by providing the first rubber ring 1232 on the flange 12313 to reduce the thickness of the first rubber ring 1232 , the material used is saved.

[0105] According to some embodiments of the present disclosure, as shown in FIG. 5 and FIG. 7 , the outer edge of the second rubber ring 1233 may be spaced apart from the side edge 12312 .

[0106] By spacing the outer edge of the second rubber ring 1233 from the side 12312, the installation of the explosion-proof valve patch 123 on the cover plate 1221 is facilitated, and the side 12312 is prevented from being bonded to the side 12312 of the boss 12211 through the second rubber ring 1233. It can also prevent the coverage of the second rubber ring 1233 from being too large, which would affect the smooth flow of the narrow channel between the boss 12211 and the side 12312.

[0107] According to some embodiments of the present disclosure, as shown in FIG. 5 , the thickness H1 of the first rubber ring 1232 and the thickness H2 of the second rubber ring 1233 may satisfy: 0.075 mm ≤ H1 ≤ 0.1 mm, 0.075 mm ≤ H2 ≤ 0.1 mm.

[0108] In this embodiment, the first rubber ring 1232 and the second rubber ring 1233 not only serve to seal the patch body 1231 with the cover plate 1221 and the boss 12211, but also serve to bond and fix them. Therefore, it is necessary to ensure that the thickness of the first rubber ring 1232 and the second rubber ring 1233 is not too small to meet the bonding strength requirements. At the same time, excessive thickness may cause material waste.

[0109] Therefore, the thickness H1 of the first rubber ring 1232 may satisfy: 0.075 mm ≤ H1 ≤ 0.1 mm, and the thickness H2 of the second rubber ring 1233 may satisfy: 0.075 mm ≤ H2 ≤ 0.1 mm.

[0110] For example, the thickness H1 of the first rubber ring 1232 can be: H1 = 0.075 mm; or H1 = 0.08 mm; or H1 = 0.09 mm; or H1 = 0.1 mm. For example, the thickness H2 of the second rubber ring 1233 can be: H2 = 0.075 mm; or H2 = 0.08 mm; or H2 = 0.09 mm; or H2 = 0.1 mm. It is understood that H1 and H2 can be equal or unequal, depending on the actual situation.

[0111] According to some embodiments of the present disclosure, as shown in FIG. 7 , the width of the first notch 12321 may be smaller than the width of the second notch 12331 .

[0112] In this embodiment, the width of the first notch 12321 is relatively small to reduce the size of the external outlet of the narrow channel, preventing the electrolyte from flowing out. The width of the second notch 12331 is relatively large. When installing the explosion-proof valve patch 123 on the cover plate 1221, the second notch 12331 needs to be aligned with the opening 12212 of the boss 12211 to avoid blocking the opening 12212 and preventing ventilation. By setting the width of the second notch 12331 relatively large, the matching is easier during installation, improving assembly efficiency and quality.

[0113] According to some embodiments of the present disclosure, as shown in FIG. 7 , the width W1 of the first notch 12321 and the width W2 of the second notch 12331 may satisfy: 0.8 mm ≤ W1 ≤ 1 mm, 3 mm ≤ W2 ≤ 4 mm.

[0114] In this embodiment, by limiting the width W1 of the first notch 12321 and the width W2 of the second notch 12331 , installation is facilitated while air permeability and leakage prevention can be simultaneously ensured with better effects.

[0115] For example, the width W1 of the first notch 12321 may be: W1 = 0.8 mm; or W1 = 0.9 mm; or W1 = 1 mm. For example, the width W2 of the second notch 12331 may be: W2 = 0.8 mm; or W2 = 0.9 mm; or W2 = 1 mm.

[0116] According to some embodiments of the present disclosure, as shown in FIG. 7 , the radial width of the first rubber ring 1232 may be smaller than the radial width of the second rubber ring 1233 .

[0117] In this embodiment, first rubber ring 1232 is used to bond to the surface of cover plate 1221. Because cover plate 1221 has a large area, the width of first rubber ring 1232 is as small as possible while ensuring bonding strength to save material. Second rubber ring 1233 is required to bond and seal with boss 12211. To ensure that patch body 1231 can effectively protect the explosion-proof valve, main body 12311 is slightly larger than boss 12211. To minimize the impact of assembly errors on the sealing effect, second rubber ring 1233 is preferably as large as possible to ensure that second rubber ring 1233 is bonded and sealed to boss 12211 along its circumference.

[0118] According to some embodiments of the present disclosure, as shown in FIG. 7 , the radial width W3 of the first rubber ring 1232 and the radial width W4 of the second rubber ring 1233 may satisfy: 0.5 mm ≤ W3 ≤ 1 mm, 3 mm ≤ W4 ≤ 5 mm.

[0119] In this embodiment, the radial width of the first rubber ring 1232 should not be too large while ensuring sufficient installation strength, thereby saving material costs. The radial width of the second rubber ring 1233 should not be too small to reduce the probability of a gap between the boss 12211 and the second rubber ring 1233 at locations other than the second notch 12331 during installation. Furthermore, an excessively large radial width of the second rubber ring 1233 should be avoided, as this will increase production costs.

[0120] For example, the radial width W3 of the first rubber ring 1232 may be: W3 = 0.5 mm; or W3 = 0.75 mm; or W3 = 1 mm. For example, the radial width W4 of the second rubber ring 1233 may be: W4 = 0.5 mm; or W4 = 0.75 mm; or W4 = 1 mm.

[0121] According to some embodiments of the present disclosure, as shown in FIG. 5 , the radial width of the second rubber ring 1233 may be no less than the width of the boss 12211 .

[0122] In this embodiment, the radial width of the second rubber ring 1233 is not less than the width of the boss 12211, so that the second rubber ring 1233 can better dock with the boss 12211 during installation, thereby improving the sealing effect and installation efficiency.

[0123] According to some embodiments of the present disclosure, as shown in FIG. 5 , a distance M1 between the inner ring of the second rubber ring 1233 and the inner ring of the boss 12211 may satisfy: 3 mm ≤ M1 ≤ 4 mm.

[0124] In this embodiment, in order to ensure the sealing effect between the second rubber ring 1233 and the boss 12211, the second rubber ring 1233 is at least partially connected to the inner ring of the boss 12211. By limiting the distance M1 between the inner ring of the second rubber ring 1233 and the inner ring of the boss 12211, the radial width of the second rubber ring 1233 is limited, and material waste of the second rubber ring 1233 is avoided.

[0125] For example, the distance M1 between the inner ring of the second rubber ring 1233 and the inner ring of the boss 12211 can be: M1 = 3 mm; or M1 = 3.5 mm; or M1 = 4 mm.

[0126] It can be understood that in some embodiments, the radial width W4 of the second rubber ring 1233 can be equal to M1. In this case, the outer ring of the second rubber ring 1233 is connected and sealed with the inner ring of the boss 12211, which can also have a sealing effect and can reduce the assembly height after the patch is assembled.

[0127] According to some embodiments of the present disclosure, the present disclosure further provides a battery 10 , which may include a plurality of battery cells 12 according to any of the above solutions.

[0128] According to some embodiments of the present disclosure, the present disclosure further provides an electric device, which may include the battery 10 of any of the above solutions, and the battery 10 is used to provide electrical energy to the electric device.

[0129] The power-consuming device may be any of the aforementioned devices or systems using the battery 10 .

[0130] According to some embodiments of the present disclosure, as shown in FIG. 5 to FIG. 7 , the present disclosure provides an explosion-proof valve patch 123 , which includes a patch body 1231 , a first rubber ring 1232 , and a second rubber ring 1233 .

[0131] The patch body 1231 includes a main body 12311, a side 12312 and a flange 12313. The side 12312 is arranged around the main body 12311 and is connected to the peripheral bend of the main body 12311. The flange 12313 is arranged in a ring shape, and the inner circle of the flange 12313 is connected to the end of the side 12312 away from the main body 12311. The main body 12311, the side 12312 and the flange 12313 are smoothly connected to form a first surface on the side of the patch body 1231 toward the bending direction of the side 12312.

[0132] The first rubber ring 1232 is disposed on the first surface of the flange 12313 and has a first notch 12321. The second rubber ring 1233 is disposed on the first surface of the main body 12311 and has a second notch 12331 on the side of the second rubber ring 1233 away from the first notch 12321.

[0133] The thickness H1 of the first rubber ring 1232 and the thickness H2 of the second rubber ring 1233 satisfy 0.075 mm ≤ H1 ≤ 0.1 mm and 0.075 mm ≤ H2 ≤ 0.1 mm. The width W1 of the first notch 12321 and the width W2 of the second notch 12331 satisfy 0.8 mm ≤ W1 ≤ 1 mm and 3 mm ≤ W2 ≤ 4 mm. The radial width W3 of the first rubber ring 1232 and the radial width W4 of the second rubber ring 1233 satisfy 0.5 mm ≤ W3 ≤ 1 mm and 3 mm ≤ W4 ≤ 5 mm.

[0134] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0135] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. An explosion-proof valve patch, wherein: include: Patch body; A first rubber ring, the first rubber ring is arranged on the first surface of the patch body, and the first rubber ring is provided with a first notch; The second rubber ring is arranged on the first surface of the patch body and is located on the inner side of the first rubber ring. The second rubber ring is provided with a second notch, and the first notch and the second notch are staggered.

2. The explosion-proof valve patch according to claim 1, wherein: The second notch is arranged on the second rubber ring at a position far away from the first notch.

3. The explosion-proof valve patch according to claim 1 or 2, wherein: The patch body comprises: A main board body, wherein the second rubber ring is arranged on the main board body; A side edge, the side edge surrounds the main board body and is bent and connected to the main board body; The flange is connected to an end of the side edge away from the main board body, and the first rubber ring is arranged on the flange.

4. The explosion-proof valve patch according to claim 3, wherein: The outer edge of the second rubber ring is spaced apart from the side edge.

5. The explosion-proof valve patch according to any one of claims 1 to 4, wherein: The thickness H1 of the first rubber ring and the thickness H2 of the second rubber ring satisfy: 0.075 mm ≤ H1 ≤ 0.1 mm, 0.075 mm ≤ H2 ≤ 0.1 mm.

6. The explosion-proof valve patch according to any one of claims 1 to 5, wherein: The width of the first notch is smaller than the width of the second notch.

7. The explosion-proof valve patch according to claim 6, wherein: The width W1 of the first notch and the width W2 of the second notch satisfy: 0.8 mm ≤ W1 ≤ 1 mm, 3 mm ≤ W2 ≤ 4 mm.

8. The explosion-proof valve patch according to any one of claims 1 to 7, wherein: The width of the first rubber ring in the radial direction is smaller than the width of the second rubber ring in the radial direction.

9. The explosion-proof valve patch according to claim 8, wherein: The radial width W3 of the first rubber ring and the radial width W4 of the second rubber ring satisfy: 0.5 mm ≤ W3 ≤ 1 mm, 3 mm ≤ W4 ≤ 5 mm.

10. A cover plate assembly, wherein: include: A cover plate, wherein the cover plate is provided with a mounting hole and has a boss surrounding the mounting hole, and the boss is provided with an opening; An explosion-proof valve, the explosion-proof valve being installed in the installation hole; The explosion-proof valve patch according to any one of claims 1 to 9, wherein the first rubber ring of the explosion-proof valve patch is in contact with the cover plate and is located outside the boss, and the second rubber ring of the explosion-proof valve patch is in contact with the boss.

11. The cover plate assembly according to claim 10, wherein: The width of the second rubber ring in the radial direction is not less than the width of the boss.

12. The cover plate assembly according to claim 11, wherein: A distance M1 between the inner ring of the second rubber ring and the inner ring of the boss satisfies: 3mm≤M1≤4mm.

13. A battery cell, wherein: include: A cover plate assembly as claimed in any one of claims 10 to 12.

14. A battery, wherein: include: A plurality of battery cells as claimed in claim 13.

15. An electrical device, wherein: include: The battery as claimed in claim 14, wherein the battery is used to provide electrical energy to the electrical device.

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