CN216529218U - Pressure relief mechanism, dustproof mechanism, battery and electrical device - Google Patents

Abstract

The embodiments of the present application provide a pressure relief mechanism, a dustproof mechanism, a battery and an electrical device, which can improve the safety performance of the battery without affecting the normal exhaust function of the pressure relief mechanism. The pressure relief mechanism includes: a valve body, the valve body is arranged on the outer wall of the box body, the valve body has a first opening; a valve core, the valve core is arranged in the first opening, and is used for When the internal pressure of the box body reaches a threshold value, the internal pressure is released through the first opening; a dustproof mechanism, the dustproof mechanism covers at least the first part of the valve body on which the valve core is provided. An opening, and the dust-proof mechanism is configured to fall off from the valve body to release the internal pressure when the internal pressure reaches a threshold value.

Description

Pressure relief mechanism, dustproof mechanism, battery and electrical device

technical field

The present application relates to the technical field of batteries, and more particularly, to a pressure relief mechanism, a dustproof mechanism, a battery and an electrical device.

Background technique

Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy saving and environmental protection. For electric vehicles, battery technology is an important factor in its development.

With the development of battery technology, higher requirements are also put forward for the safety performance of batteries. The casing of the battery is usually provided with a pressure relief mechanism, so that when the air pressure inside the battery suddenly rises, the pressure inside the battery is released through the pressure relief mechanism, thereby preventing the battery from exploding. If the exhaust passage of the pressure relief mechanism is blocked, or the pressure relief mechanism is lifted by the external high-pressure water flow, the safety performance of the battery will be affected. Therefore, how to improve the safety performance of the battery is an urgent problem to be solved.

Utility model content

The embodiments of the present application provide a pressure relief mechanism, a dustproof mechanism, a battery and an electrical device, which can improve the safety performance of the battery without affecting the normal exhaust function of the pressure relief mechanism.

In a first aspect, a pressure relief mechanism is provided, which is arranged in a box body, and includes: a valve body, the valve body is arranged on the outer wall of the box body, and the valve body has a first opening; a valve core, the The valve core is arranged in the first opening, and is used for releasing the internal pressure through the first opening when the internal pressure of the box body reaches a threshold value; a dustproof mechanism, the dustproof mechanism covers at least the The valve body is provided with the first opening of the valve core, and the dustproof mechanism is configured to fall off from the valve body when the internal pressure reaches a threshold value to release the internal pressure.

By arranging a dust-proof mechanism outside the valve body provided with the valve core, the first opening and the gap between the valve core and the valve body can be prevented from forming an exhaust passage directly exposed to the environment outside the box body, which can effectively avoid dust, mud, External foreign objects such as gravel enter the exhaust passage. At the same time, the dustproof mechanism can fall off from the valve body when the internal pressure of the box body reaches a threshold value, and it will not affect the normal exhaust function of the pressure relief mechanism, thereby improving the safety performance of the battery.

In some embodiments, the dustproof mechanism includes a bottom wall and a side wall, the bottom wall covers a first surface of the valve body, and the first surface is a surface of the valve body perpendicular to the valve body The surface in the thickness direction and facing away from the inside of the box body, the side wall covers the second surface of the valve body, and the second surface is the surface on the valve body parallel to the thickness direction of the valve body, so The dust-proof mechanism is provided with a limiting portion, the limiting portion is provided on the side wall, and protrudes from the side wall in the direction toward the center of the valve body, and the second surface of the valve body is provided with A groove is provided corresponding to the limiting portion for accommodating the limiting portion.

By accommodating the limiting portion provided on the side wall of the dust-proof mechanism in the groove provided on the second surface of the valve body, the dust-proof structure can be prevented from falling off easily from the valve body, avoiding dust, mud, debris, etc. External foreign objects such as stones enter the exhaust passage, which can better protect the pressure relief mechanism.

In some embodiments, the limiting portion is configured to be accommodated in the groove when the internal pressure does not reach a threshold value, so as to prevent the dust-proof mechanism from falling off the valve body; in the internal pressure When the pressure reaches a threshold value, the groove is disengaged, so that the dustproof mechanism is dislodged from the valve body.

By setting the limit part on the pressure relief mechanism, when the internal pressure does not reach the threshold value, for example, the pressure inside and outside the box is relatively balanced, or under the impact of external high-pressure water flow, the dustproof mechanism can not easily fall off the valve body. At the same time, when the internal pressure of the box body reaches a certain threshold, the limiting part can fall off from the valve body, so that the normal exhaust function of the pressure relief mechanism is not affected, thereby improving the safety performance of the battery.

In some embodiments, the groove surrounds the valve body along the second surface, and on a plane perpendicular to the thickness direction of the valve body, the limiting portion surrounds the anti-blocking portion along the side wall. The dust mechanism is accommodated in the groove.

By arranging the grooves and the limit parts surrounding the second surface of the valve body, no matter which direction the pressure relief mechanism is impacted by the high-pressure water flow, the dust-proof mechanism will not fall off due to the impact of external force, which can ensure that the dust-proof mechanism can prevent the valve body from falling off. And the protective effect of the valve core, which can improve the safety performance of the battery.

In some embodiments, the dustproof mechanism is made of a resilient material.

The dust-proof mechanism is made of elastic material, which can make the dust-proof mechanism easier to fall off when the internal pressure reaches a threshold value, thereby ensuring the normal exhaust function of the pressure relief mechanism and improving the safety performance of the battery.

In some embodiments, a gap is provided between the limiting portion and the groove.

By setting a gap between the limiting portion and the groove, the limiting portion is more likely to fall off when the internal pressure reaches the threshold value, and at the same time, the limiting portion can still be guaranteed to cover the outer surface of the valve body when subjected to external force. , to protect the valve body and valve core, so as to improve the safety performance of the battery.

In some embodiments, the side wall of the dust-proof mechanism is provided with a protective part for covering the gap between the valve body and the outer wall of the box body.

The protective part can prevent high-pressure water from entering the inside of the box through the gap between the valve body and the box body, and can also prevent the entry of external foreign objects such as dust, mud, and gravel, thereby improving the safety performance of the battery.

In some embodiments, the part of the dustproof mechanism other than the limiting portion is in contact with the surface of the valve body on which the valve core is provided.

The part of the dust-proof mechanism other than the limit part is attached to the surface of the valve body provided with the valve core, so that the dust-proof mechanism is not easy to fall off from the valve body when the internal and external pressures of the box body are relatively balanced, so that it can prevent the dust-proof mechanism from falling off easily. It has a good protective effect on the pressure relief mechanism and improves the safety performance of the battery.

In a second aspect, a dust-proof mechanism is provided for a pressure relief mechanism, the pressure relief mechanism is arranged on a box body, and the dust-proof mechanism includes: a main body, the main body includes a bottom wall and a side wall, the bottom The wall is used to cover the first surface of the valve body of the pressure relief mechanism. The wall is used to cover the second surface of the valve body, and the second surface is the surface of the valve body parallel to the thickness direction of the valve body; the limiting part, the limiting part is arranged on the side on the wall, and protrudes from the side wall in a direction toward the center of the valve body, wherein the stopper is configured to prevent the prevention The dust-proof mechanism is detached from the valve body, and when the internal pressure reaches a threshold value, the dust-proof mechanism is detached from the valve body.

Setting a limit portion on the dust-proof mechanism can make the dust-proof mechanism still protect the valve body and valve core when it is impacted by the outside, and prevent external foreign objects such as dust, mud, gravel and other foreign objects from entering the exhaust passage and affecting the leakage. The exhaust function of the pressure mechanism. At the same time, the limiting portion can fall off from the valve body when the pressure relief mechanism releases the pressure, and will not affect the normal exhaust function of the pressure relief mechanism, thereby improving the safety performance of the battery.

In some embodiments, the dustproof mechanism further includes: a protection part, the protection part is disposed on the side wall and used to cover the gap between the pressure relief mechanism and the outer wall of the box body.

The protective part can prevent high-pressure water from entering the inside of the box through the gap between the valve body and the box body, and can also prevent the entry of external foreign objects such as dust, mud, and gravel, thereby improving the safety performance of the battery.

In a third aspect, a battery is provided, comprising: a box body, the box body is provided with the pressure relief mechanism according to any one of the above solutions; and a battery cell is accommodated in the box body.

In a fourth aspect, an electrical device is provided, comprising: the battery according to any one of the above solutions, the battery is used to provide electrical energy for the electrical device.

In the embodiments provided in the present application, by arranging a dust-proof mechanism outside the valve body provided with the valve core, when the battery box does not need to be depressurized, the dust-proof mechanism at least covers the first opening on the valve body provided with the valve core, Isolating external foreign objects such as dust, mud, and gravel from the first opening can prevent the first opening and the exhaust channel formed by the gap between the valve core and the valve body from being directly exposed to the environment outside the box, thereby avoiding external Foreign body blockage. At the same time, when the pressure relief mechanism is impacted by the external high-pressure water flow, the dust-proof mechanism can more closely fit the valve body and the valve core to avoid being lifted by the high-pressure water flow. When the internal pressure of the battery box reaches the threshold, the gas inside the battery box needs to be discharged through the exhaust passage in the pressure relief mechanism. The dust-proof mechanism can fall off the valve body under the action of the internal high-pressure gas without affecting the leakage. The normal exhaust function of the pressure mechanism can improve the safety performance of the battery.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the drawings required in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to the drawings without any creative effort.

1 is a schematic diagram of a vehicle provided by an embodiment of the present application;

2 is a schematic diagram of a battery provided by an embodiment of the present application;

3 is a schematic diagram of a pressure relief mechanism provided by an embodiment of the present application;

4 is a top view of a pressure relief mechanism provided by an embodiment of the present application;

Fig. 5 is the sectional view of the direction B-B in Fig. 4;

FIG. 6 is a schematic diagram of a dustproof mechanism provided by an embodiment of the present application.

The reference numerals in the specific embodiment are as follows:

1 - vehicle;

10-battery, 11-box, 20-battery unit, 30-controller, 40-motor;

110-pressure relief mechanism, 111-first part, 112-second part, 120-valve body, 121-first opening, 122-groove, 130-spool, 140-dust-proof mechanism, 141-bottom wall, 142 -Sidewall, 143-Limiting part, 144-Protecting part, 145-Main body.

Detailed ways

The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present application more clearly, and are therefore only used as examples, and cannot be used to limit the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this application; the terms used herein are for the purpose of describing specific embodiments only, and are not intended to be Limiting this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and should not be understood as indicating or implying relative importance or implying the number, specificity and quantity of indicated technical features. Sequential or primary and secondary relationship. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only an association relationship for describing associated objects, indicating that there may be three relationships, such as A and/or B, which may indicate that A exists alone, and A exists at the same time and B, there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to is more than two pieces (including two pieces).

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "horizontal", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical" "Horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on those shown in the accompanying drawings The orientation or positional relationship is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as implementing the present application. example limitations.

In the description of the embodiments of the present application, unless otherwise expressly specified and limited, the technical terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a fixed connection. The connection can be disassembled or integrated; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two elements or the interaction relationship between the two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as water, fire, wind and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as military equipment and aerospace and other fields. . With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cell may be in the form of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which are not limited in the embodiments of the present application. The battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, which are not limited in the embodiments of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the batteries mentioned in this application may include battery modules or battery packs, and the like. Batteries typically include a case for enclosing one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a separator. The battery cell mainly relies on the movement of metal ions between the positive pole piece and the negative pole piece to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The fluid, the positive electrode current collector without the positive electrode active material layer was used as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganate. The negative electrode pole piece includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode current collector without the negative electrode active material layer is protruded from the negative electrode collector that has been coated with the negative electrode active material layer. Fluid, the negative electrode current collector without the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (PE). In addition, the electrode assembly may be a wound structure or a laminated structure, and the embodiment of the present application is not limited thereto.

In order to meet different power demands, a battery may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in a mixed connection, and a mixed connection refers to a mixture of series and parallel connections. Optionally, a plurality of battery cells can be connected in series or in parallel or mixed to form a battery module, and then a plurality of battery modules can be connected in series or in parallel or mixed to form a battery. That is to say, a plurality of battery cells can directly form a battery, or a battery module can be formed first, and then the battery module can be formed into a battery. The battery is further disposed in the electrical equipment to provide electrical energy for the electrical equipment.

The development of battery technology needs to consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, it is also necessary to consider the safety performance of the battery.

In order to prevent explosion caused by excessive pressure inside the battery, a pressure relief mechanism is usually provided on the battery box, so that when the internal pressure of the battery reaches the burst pressure value, the high pressure gas will actuate the pressure relief mechanism, and the pressure relief mechanism will pass through the pressure relief mechanism. The exhaust channel provided in the battery releases the pressure inside the battery to prevent the battery from exploding. However, a part of the exhaust passage of the pressure relief mechanism is often communicated with the outside of the battery box, which is easily affected by the external environment and affects the safety performance of the battery. For example, when the exhaust channel is too small, the channel is easily blocked by external foreign objects such as dust, mud, gravel, etc., resulting in poor exhaust; when the exhaust channel is too large, the size of the pressure relief mechanism is increased, and it is easy to be The external high-pressure water flow can not meet the IPX9K performance requirements.

In view of this, the present application provides a technical solution, wherein a dustproof mechanism is arranged outside the exhaust passage of the pressure relief mechanism, which can effectively prevent external foreign objects such as dust, mud, and gravel from entering the exhaust passage. At the same time, the dustproof mechanism can fall off when the internal pressure of the box body reaches a threshold value, without affecting the normal exhaust function of the pressure relief mechanism.

The "actuating" mentioned in this application refers to the action of the pressure relief mechanism, so that the internal pressure of the battery case can be released. In this way, the battery case can be depressurized under controllable pressure or temperature, thereby avoiding a potentially more serious accident.

The technical solutions described in the embodiments of this application are all applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, the spacecraft includes Planes, rockets, space shuttles and spaceships, etc.

It should be understood that the technical solutions described in the embodiments of the present application are not only applicable to the above-described devices, but also applicable to all devices using batteries. However, for the sake of brevity, the following embodiments are described by taking electric vehicles as an example.

For example, as shown in FIG. 1 , which is a schematic structural diagram of a vehicle 1 according to an embodiment of the application, the vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or Extended range cars, etc. The interior of the vehicle 1 may be provided with a motor 40 , a controller 30 and a battery 10 , and the controller 30 is used to control the battery 10 to supply power to the motor 40 . For example, the battery 10 may be provided at the bottom of the vehicle 1 or at the front or rear of the vehicle. The battery 10 can be used for power supply of the vehicle 1 , for example, the battery 10 can be used as the operating power source of the vehicle 1 , for the circuit system of the vehicle 1 , for example, for the starting, navigation and operation power requirements of the vehicle 1 . In another embodiment of the present application, the battery 10 can not only be used as the operating power source of the vehicle 1 , but also can be used as the driving power source of the vehicle 1 to provide driving power for the vehicle 1 in place of or partially in place of fuel or natural gas.

In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells. For example, as shown in FIG. 2 , which is a schematic structural diagram of a battery 10 according to an embodiment of the present application, the battery 10 may include a plurality of battery cells 20 . The battery 10 may further include a case body 11 , the interior of the case body 11 is a hollow structure, and a plurality of battery cells 20 are accommodated in the case body 11 . As shown in FIG. 2 , the box body 11 may include two parts, here referred to as a first part 111 (upper box body) and a second part 112 (lower box body) respectively, the first part 111 and the second part 112 are fastened together. The shapes of the first part 111 and the second part 112 may be determined according to the combined shape of the plurality of battery cells 20 , and each of the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 can be a hollow cuboid and each has only one surface that is an open surface, the opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are interlocked with each other A box body 11 with a closed cavity is formed. A plurality of battery cells 20 are placed in the box 11 formed after the first part 111 and the second part 112 are buckled together after being combined in parallel or in series or in a mixed connection.

Optionally, the battery 10 may also include other structures, which will not be repeated here. For example, the battery 10 may further include a bussing component for realizing electrical connection between the plurality of battery cells 20, such as parallel or series or hybrid. Specifically, the bus member may realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20 . Further, the bus members may be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 can be further drawn out through the box body 11 through the conductive mechanism. Optionally, the conducting means may also belong to the bussing member.

According to different power requirements, the number of battery cells 20 can be set to any value. A plurality of battery cells 20 can be connected in series, in parallel or in a mixed manner to achieve larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 may be arranged in groups, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited, and can be set according to requirements. The battery may include a plurality of battery modules, and the battery modules may be connected in series, parallel, or mixed.

The pressure relief mechanism 110 provided by the embodiments of the present application will be described in detail below with reference to FIGS. 3 to 5 . The pressure relief mechanism 110 is a pressure relief mechanism 110 provided on the box body 11 , as shown in FIGS. 3 to 5 , including a valve body. 120 , the valve core 130 and the dustproof mechanism 140 . The valve body 120 is arranged on the outer wall of the box body 11, and the valve body 120 has a first opening 121; the valve core 130 is arranged in the first opening 121, and is used for leaking through the first opening 121 when the internal pressure of the box body 11 reaches a threshold value release the internal pressure; the dustproof mechanism 140 covers at least the first opening 121 of the valve body 120 on which the valve core 130 is provided, and the dustproof mechanism 140 is configured to fall off from the valve body 120 when the internal pressure reaches a threshold value, to relieve internal pressure.

The valve body 120 is a part of the pressure relief mechanism 110 that is fixedly connected to the outer wall of the case body 11 . The first opening 121 may also be provided with a portion penetrating the valve body 120 in the thickness direction of the valve body 120 for accommodating a guide rod on the valve core 130 for actuation. For example, in FIG. 3 to FIG. 5, a spring may be arranged around the guide rod of the valve core 130. When the air pressure inside and outside the box body 11 is in a balanced state, the spring can make the valve core 130 closely fit with the valve body 120; When the internal pressure of the box body 11 reaches a certain threshold, the valve core 130 is actuated under the action of the internal pressure to separate from the valve body 120 to form an exhaust passage, so that the high pressure gas inside the box body 11 can be discharged.

In the embodiment of the present application, the pressure relief mechanism 110 is further provided with a dustproof mechanism 140 . The dustproof mechanism 140 is disposed on the outer surface of the pressure relief mechanism 110 and at least covers the first opening 121 of the valve body 120 on which the valve core 130 is disposed. That is to say, if the dustproof mechanism 140 covers at least the first opening 121 of the valve body 120 , and the valve core 130 is disposed in the first opening 121 , the at least part covered by the dustproof mechanism 140 is the first opening 121 and the first opening 121 . The valve core 130 provided in the opening 121 .

When the internal pressure of the box body 11 reaches a threshold value, the valve core 130 is actuated under the action of the high pressure gas inside the box body 11 to form an exhaust passage with the valve body 120 . At the same time, the dust-proof mechanism 140 covering the surface of the valve body 120 is affected by the high-pressure gas flushed from the exhaust passage, and falls off the valve body 120, so that the high-pressure gas can be quickly released and the safety performance of the battery is ensured.

By arranging the dustproof mechanism 140 outside the valve body 120 provided with the valve core 130 , the first opening 121 and the gap between the valve core 130 and the valve body 120 can be prevented from forming an exhaust passage directly exposed to the environment outside the box body 11 . , which can effectively prevent external foreign objects such as dust, mud, and gravel from entering the exhaust channel. At the same time, the dustproof mechanism 140 can fall off from the valve body 120 when the internal pressure of the box body 11 reaches the threshold value, and will not affect the normal exhaust function of the pressure relief mechanism 110, thereby improving the safety performance of the battery.

According to some embodiments of the present application, optionally, the dust-proof mechanism 140 includes a bottom wall 141 and a side wall 142 . The bottom wall 141 covers a first surface of the valve body 120 , and the first surface is a surface on the valve body 120 that is perpendicular to the valve body 120 . The side wall 142 covers the second surface of the valve body 120, the second surface is the surface of the valve body 120 parallel to the thickness direction of the valve body 120, and the dust-proof mechanism 140 is provided with a limit part 143, the limiting part 143 is disposed on the side wall 142, and protrudes from the side wall 142 in the direction toward the center of the valve body 120, the second surface of the valve body 120 is provided with a groove 122, the groove 122 and the limiting part 143 is correspondingly provided for accommodating the limiting portion 143 .

In order to prevent foreign objects such as dust, mud, and gravel from entering the exhaust passage, the dustproof mechanism 140 may be configured to wrap at least part of the valve body 120 , that is, the dustproof structure may cover both the first surface of the valve body 120 and the The second surface of the valve body 120 . The first surface is perpendicular to the thickness direction of the valve body 120 and is away from the interior of the box body 11. Considering that the valve core 130 is disposed in the first opening 121 of the valve body 120, the first surface should be understood as the valve body 120, the first surface A surface formed by the opening 121 and the valve core 130 together. The second surface is the surface of the valve body 120 that is parallel to the thickness direction of the valve body 120 , that is, the surface surrounding the valve body 120 in FIGS. 3 to 5 . Therefore, the dustproof mechanism 140 may include a bottom wall 141 for covering the first surface and a side wall 142 for covering the second surface.

The side wall 142 of the dustproof mechanism 140 is provided with a limiting portion 143 , which protrudes from the side wall 142 in the direction toward the center of the valve body 120 and is accommodated in the corresponding groove 122 on the second surface of the valve body 120 . For example, the limiting portion 143 can be one or more; it can be evenly distributed on the second surface of the valve body 120, or can be set at a specific position as required; it can be distributed in the form of a lattice, or it can be distributed around the valve body A lap of 120. The specific description of the limiting portion 143 above is only an example, and not limited.

By accommodating the limiting portion 143 provided on the side wall 142 of the dust-proof mechanism 140 in the groove 122 provided on the second surface of the valve body 120, the dust-proof structure 140 can be prevented from falling off easily from the valve body 120 , to prevent external foreign objects such as dust, mud, and gravel from entering the exhaust passage, so that the pressure relief mechanism 110 can be well protected.

According to some embodiments of the present application, the limiting portion 143 is configured to be accommodated in the groove 122 when the internal pressure does not reach the threshold value, so as to prevent the dust-proof mechanism 140 from falling off from the valve body 120; when the internal pressure reaches the threshold value, the limiting portion 143 is disengaged The groove 122 is formed to make the dustproof mechanism 140 fall off from the valve body 120 .

When the internal and external pressures of the box body 11 are relatively balanced, the dustproof mechanism 140 needs to be kept in a state of covering the first surface and the second surface of the valve body 11 , that is, the pressure relief mechanism 110 does not need to release the internal pressure. However, it is not desirable that the dust-proof mechanism 140 and the valve body 120 fall off, so that the dust-proof mechanism 140 can play the role of preventing external foreign objects from entering the exhaust passage. When the internal pressure reaches a certain threshold, the pressure relief mechanism 110 needs to release the internal pressure through the first opening 121, and it is hoped that the dustproof mechanism 140 can be separated from the valve body 120, so that the internal high pressure gas can be discharged smoothly. Therefore, the limiting portion 143 needs to be disengaged from the groove 122 , so that the dustproof mechanism 140 is detached from the valve body 120 , so that the pressure relief mechanism 110 can release the internal pressure through the exhaust passage.

By arranging the limiting portion on the pressure relief mechanism 110, when the internal pressure does not reach the threshold value, for example, the internal and external pressures of the box body 11 are relatively balanced, or under the impact of external high-pressure water flow, the dustproof mechanism 140 can not easily escape from the valve body 120. fall off. At the same time, when the internal pressure of the box body 11 reaches a certain threshold, the limiting portion 143 can fall off the valve body 120 again, so that the normal exhaust function of the pressure relief mechanism 110 is not affected, thereby improving the safety performance of the battery.

According to some embodiments of the present application, optionally, the groove 122 surrounds the valve body 120 along the second surface, and on a plane perpendicular to the thickness direction of the valve body 120 , the limiting portion 143 surrounds the dustproof mechanism 140 along the side wall 142 . , and is accommodated in the groove 122 .

The groove 122 of the valve body 120 may be arranged to surround the valve body 120 along the second surface of the valve body 120 . Accordingly, the limiting portion 143 may be arranged to surround the side wall 142 of the dustproof mechanism 140 , and faces the valve body. The direction of 120 protrudes from the side wall 142 . It should be understood that the groove 122 of the valve body 120 and the limiting portion 143 of the dustproof structure are always provided correspondingly, so that the limiting portion 143 can always be accommodated in the groove 122 .

By arranging the groove 122 and the limiting portion 143 surrounding the second surface of the valve body 120, no matter which direction the pressure relief mechanism 110 is impacted by the high-pressure water flow, the dust-proof mechanism 140 will not fall off due to the impact of external force, which can ensure the protection against The protective effect of the dust mechanism 140 on the valve body 120 and the valve core 130 can be improved, so that the safety performance of the battery can be improved.

According to some embodiments of the present application, optionally, the dustproof mechanism 140 is made of an elastic material.

In order to ensure that the dustproof mechanism 140 can fall off when the pressure relief mechanism 110 releases the internal pressure, the dustproof mechanism 140 may be made of elastic material, for example, may be formed of soft glue. When the dust-proof mechanism 140 is impacted by the internal pressure of the box body 11, it can be deformed by force, so as to fall off the valve body 120, so that after the gas is discharged through the exhaust passage, the dust-proof mechanism 140 after falling off and the valve body 120 are separated. The gap between them is discharged to the outside of the box body 11 .

The dust-proof mechanism 140 is made of elastic material, which can make the dust-proof mechanism 140 easier to fall off when the internal pressure reaches the threshold, thereby ensuring the normal exhaust function of the pressure relief mechanism 110 and improving the safety performance of the battery.

According to some embodiments of the present application, optionally, a gap is provided between the limiting portion 143 and the groove 122 .

A gap is provided between the limiting portion 143 and the groove 122 , which means that when the limiting portion 143 is accommodated in the groove 122 , it is not in contact with the surface inside the groove 122 .

By setting a gap between the limiting portion 143 and the groove 122 , the limiting portion 143 is more likely to fall off when the internal pressure reaches the threshold value, and at the same time, the limiting portion 143 can still ensure that it is covered on the valve when subjected to an external force. The outer surface of the body 120 plays a protective role for the valve body 120 and the valve core 130, thereby improving the safety performance of the battery.

According to some embodiments of the present application, optionally, the dustproof mechanism 140 is provided with a protective portion 144 , and the protective portion 144 is provided on the side wall 142 for covering the gap between the valve body 120 and the outer wall of the box body 11 .

The protection portion 144 may be a portion of the side wall 142 extending toward the interior of the case 11 , and is used to cover the gap between the valve body 120 and the outer wall of the case 11 . Generally speaking, when the valve body 120 is fixedly connected to the outer wall of the box body 11 , the surface of the valve body 120 perpendicular to the thickness direction of the valve body 120 and facing the inside of the box body 11 is in close contact with the outer wall of the box body 11 , but there is always a certain Clearance. Therefore, the guard 144 can be used to cover the gap, further reducing the gap. In some possible implementations, when the dust-proof mechanism 140 is made of an elastic material, the outer wall of the box body 11 can be squeezed to a certain extent at the gap between the valve body 120 and the outer wall of the box body 11 to achieve A certain degree of sealing effect enhances the protective effect of the dustproof mechanism 140 on the pressure relief mechanism 110 .

The protection portion 144 can prevent high-pressure water from entering the box 11 through the gap between the valve body 120 and the box 11 , and can also prevent the entry of external foreign objects such as dust, mud, and gravel, thereby improving the safety performance of the battery.

According to some embodiments of the present application, optionally, a portion of the dustproof mechanism 140 other than the limiting portion 143 is attached to the surface of the valve body 120 on which the valve core 130 is provided.

As shown in FIG. 3 to FIG. 5 , the dustproof mechanism 140 may include a side wall 142 and a bottom wall 141 , the bottom wall 141 is in contact with the first surface of the valve body 120 , and the side wall 142 is in contact with the second surface of the valve body 120 . . The first surface is the surface of the first opening 121 facing away from the inside of the box body 11 , and a valve core 130 is disposed in the first opening 121 . That is, the bottom wall 141 of the dustproof mechanism 140 simultaneously covers the surfaces of the valve body 120 and the valve core 130 which are perpendicular to the thickness direction of the valve body 120 and away from the interior of the box body 11 , and the first opening 121 . The second surface is the surface of the valve body 120 that is parallel to the thickness direction of the valve body 120 , that is, the surface surrounding the valve body 120 in FIGS. 3 to 5 . When a protective portion 144 is provided on the side wall 142 of the dustproof mechanism 140 , the protective portion 144 may also be attached to the second surface of the valve body 120 .

Parts of the dustproof mechanism 140 other than the limiting portion 143 are in contact with the surface of the valve body 120 provided with the valve core 130 , so that the dustproof mechanism 140 is not easily connected to the surface of the valve body 120 when the internal and external pressures of the box body 11 are relatively balanced. The valve body 120 falls off, thereby better protecting the pressure relief mechanism 110 and improving the safety performance of the battery.

The embodiment of the present application further provides a dust-proof mechanism 140 for the pressure relief mechanism 110 , and the pressure relief mechanism 110 is disposed on the box body 11 . As shown in FIG. 6 , the dustproof mechanism 140 includes a main body 145 and a limiting portion 143 . The main body 145 includes a bottom wall 141 and a side wall 142. The bottom wall 141 is used to cover the first surface of the valve body 120. The first surface is the surface of the valve body 120 that is perpendicular to the thickness direction of the valve body 120 and faces away from the interior of the box body 11. The side wall 142 is used to cover the second surface of the valve body 120 , and the second surface is the surface of the valve body 120 parallel to the thickness direction of the valve body 120 ; the limiting portion 143 is disposed on the side wall 142 and faces the valve body 120 The direction of the center of the valve protrudes from the side wall 142, wherein the stopper is configured to prevent the dust-proof mechanism 140 from falling off from the valve body 120 when the internal pressure of the box body 11 does not reach the threshold value, and when the internal pressure reaches the threshold value, The dustproof mechanism 140 is made to fall off from the valve body 120 .

The dustproof mechanism 140 provided in the embodiment of the present application can be used for the pressure relief mechanism 110 , wherein the pressure relief mechanism 110 is provided on the box body 11 . In order to prevent foreign objects such as dust, mud, and gravel from entering the exhaust passage of the pressure relief mechanism 110 , the main body 145 of the dustproof mechanism 140 may be configured to wrap at least part of the valve body 120 . Then the bottom wall 141 of the dust-proof mechanism 140 can cover the first surface of the valve body 120 , that is, the surface of the valve body 120 perpendicular to the thickness direction of the valve body 120 and away from the interior of the box body 11 , considering the first opening of the valve body 120 121 is provided with a valve core 130, the first surface should be understood as the surface formed by the valve body 120, the first opening 121 and the valve core 130; the side wall 142 of the dustproof mechanism 140 can cover the second surface, that is, the valve body 120. A surface parallel to the thickness direction of the valve body 120 .

At the same time, the dustproof mechanism 140 further includes a limiting portion 143 , and the limiting portion 143 can make the dustproof mechanism 140 cover the first opening 121 of the valve body 120 provided with the valve core 130 when the air pressure inside and outside the box body 11 is relatively balanced. , to prevent dust, mud, gravel and other external foreign matter from entering the exhaust channel. When the internal pressure of the pressure relief mechanism 110 reaches a threshold value and the internal pressure of the box body 11 needs to be released, the limiting portion 143 can be separated from the groove 122 provided on the valve body 120 under the action of the internal pressure, and the entire body is protected from dust The mechanism 140 falls off from the pressure relief mechanism 110 , so that the normal exhaust function of the pressure relief mechanism 110 will not be affected.

The limiting portion 143 is provided on the dust-proof mechanism 140, so that the dust-proof mechanism 140 can still protect the valve body 120 and the valve core 130 when it is impacted by the outside, so as to prevent external foreign objects such as dust, mud, and gravel from entering the exhaust. The air passage affects the exhaust function of the pressure relief mechanism 110 . Meanwhile, the limiting portion 143 can fall off from the valve body 120 when the pressure relief mechanism 110 releases the pressure, and will not affect the normal exhaust function of the pressure relief mechanism 110, thereby improving the safety performance of the battery.

According to some embodiments of the present application, optionally, the dustproof mechanism 140 further includes a protection portion 144 , and the protection portion 144 is disposed on the side wall 142 for covering the gap between the pressure relief mechanism 110 and the outer wall of the box body 11 .

The side wall 142 of the dustproof mechanism 140 may also be provided with a protective portion 144 , the protective portion 144 is a part of the side wall 142 , and the side wall 142 provided with the protective portion 144 can completely cover the second surface of the pressure relief mechanism 110 . At the same time, since there is still a certain gap between the pressure relief mechanism 110 and the outer wall of the box body 11 , the protective portion 144 is also used to cover the gap between the pressure relief mechanism 110 and the outer wall of the box body 11 , so as to prevent foreign matter from passing through the gap. Entering the inside of the box 11, causing a safety hazard.

The protection portion 144 can prevent high-pressure water from entering the box 11 through the gap between the valve body 120 and the box 11 , and can also prevent the entry of external foreign objects such as dust, mud, and gravel, thereby improving the safety performance of the battery.

The present application also provides a battery 10 , which includes a box body 11 , and the box body 11 is provided with the pressure relief mechanism 110 described in any of the above solutions; the battery cells 20 are accommodated in the box body 11 .

According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 described in any of the above solutions, and the battery 10 is used to provide electrical energy for the electrical device.

According to some embodiments of the present application, the present application provides a pressure relief mechanism 110 , which includes a valve body 120 , a valve core 130 and a dustproof mechanism 140 . The valve core 130 is disposed in the first opening 121 of the valve body 120 , and the dustproof mechanism 140 can cover the valve body 120 , the valve core 130 and the first opening 121 to protect the exhaust passage on the pressure relief mechanism 110 . The valve body 120 may also be provided with a groove 122 corresponding to the limit portion 143 on the dust-proof mechanism 140, so that when the internal pressure of the dust-proof mechanism 140 reaches a threshold value, the dust-proof mechanism 140 falls off from the valve body 120 to release the internal pressure, thereby Without affecting the normal exhaust function of the pressure relief mechanism 110, external foreign objects such as dust, mud, and gravel can be effectively prevented from entering the exhaust channel, thereby improving the safety performance of the battery.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in the present application. Modifications or substitutions shall be covered by the protection scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (12)

1. A pressure relief mechanism (110), characterized by being provided in a case (11), comprising:

a valve body (120), wherein the valve body (120) is arranged on the outer wall of the box body (11), and the valve body (120) is provided with a first opening;

a spool (130), the spool (130) being disposed within the first opening (121) for venting the internal pressure of the tank (11) through the first opening (121) when the internal pressure reaches a threshold value;

a dust prevention mechanism (140), the dust prevention mechanism (140) covering at least the first opening (121) of the valve body (120) at which the valve element (130) is provided, the dust prevention mechanism (140) being configured to drop from the valve body (120) to release the internal pressure when the internal pressure reaches a threshold value.

2. The pressure relief mechanism (110) according to claim 1, wherein the dust prevention mechanism (140) comprises a bottom wall (141) and a side wall (142), the bottom wall (141) covers a first surface of the valve body (120), the first surface being a surface of the valve body (120) perpendicular to a thickness direction of the valve body (120) and facing away from an interior of the case (11), the side wall (142) covers a second surface of the valve body (120), the second surface being a surface of the valve body (120) parallel to the thickness direction of the valve body (120), the dust prevention mechanism (140) is provided with a stopper portion (143), the stopper portion (143) is provided on the side wall (142) and protrudes from the side wall (142) in a direction toward a center of the valve body (120), the second surface of the valve body (120) is provided with a groove (122), the groove (122) is arranged corresponding to the limiting part (143) and is used for accommodating the limiting part (143).

3. The pressure relief mechanism (110) of claim 2, wherein the stopper (143) is configured to: when the internal pressure does not reach a threshold value, the dust-proof mechanism is accommodated in the groove (122) to prevent the dust-proof mechanism (140) from falling off the valve body (120); disengaging the groove (122) when the internal pressure reaches a threshold value to disengage the dust prevention mechanism (140) from the valve body (120).

4. The pressure relief mechanism (110) according to claim 2, wherein the groove (122) surrounds the valve body (120) along the second surface, and the stopper (143) surrounds the dust prevention mechanism (140) along the side wall (142) in a plane perpendicular to a thickness direction of the valve body (120) and is accommodated in the groove (122).

5. The pressure relief mechanism (110) of claim 1, wherein the dust prevention mechanism (140) is made of an elastic material.

6. The pressure relief mechanism (110) of claim 2, wherein a gap is provided between the limiting portion (143) and the groove (122).

7. The pressure relief mechanism (110) according to claim 2, wherein the side wall (142) of the dust prevention mechanism (140) is provided with a guard (144) for covering a gap between the valve body (120) and an outer wall of the case (11).

8. The pressure relief mechanism (110) according to claim 2, wherein a portion of the dust prevention mechanism (140) other than the stopper portion (143) is in abutment with a surface of the valve body (120) where the valve element (130) is provided.

9. A dust prevention mechanism (140) for a pressure relief mechanism (110), the pressure relief mechanism (110) being provided in a case (11), the dust prevention mechanism (140) comprising:

the main body (145) comprises a bottom wall (141) and a side wall (142), the bottom wall (141) is used for covering a first surface of a valve body (120) of the pressure relief mechanism (110), the first surface is a surface, perpendicular to the thickness direction of the valve body (120), of the valve body (120) and facing away from the interior of the box body (11), the side wall (142) is used for covering a second surface of the valve body (120), and the second surface is a surface, parallel to the thickness direction of the valve body (120), of the valve body (120);

the limiting portion (143) is arranged on the side wall (142), and protrudes out of the side wall (142) in the direction towards the center of the valve body (120), wherein the limiting portion (143) is configured to prevent the dustproof mechanism (140) from falling off from the valve body (120) when the internal pressure of the box body (11) does not reach a threshold value, and to enable the dustproof mechanism (140) to fall off from the valve body (120) when the internal pressure reaches the threshold value.

10. The dust-prevention mechanism (140) of claim 9, wherein the dust-prevention mechanism (140) further comprises:

the protection part (144) is arranged on the side wall (142) and used for covering a gap between the pressure relief mechanism (110) and the outer wall of the box body (11).

11. A battery (10), comprising:

-a box (11), said box (11) being provided with a pressure relief mechanism (110) according to any one of claims 1 to 8;

and a battery cell (20) accommodated in the case (11).

12. An electric device, comprising:

the battery (10) of claim 11, the battery (10) being configured to provide electrical energy to the powered device.

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