CN216529218U

CN216529218U - Pressure relief mechanism, dustproof mechanism, battery and power consumption device

Info

Publication number: CN216529218U
Application number: CN202122719256.6U
Authority: CN
Inventors: 陈彬彬
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-05-13
Anticipated expiration: 2031-11-08

Abstract

The embodiment of the application provides a pressure relief mechanism, dustproof mechanism, battery and power consumption device, can improve the security performance of battery under the condition that does not influence pressure relief mechanism's normal exhaust function. This pressure relief mechanism includes: the valve body is arranged on the outer wall of the box body and provided with a first opening; a valve element disposed within the first opening for venting the internal pressure of the tank through the first opening when the internal pressure reaches a threshold value; a dust prevention mechanism covering at least the first opening on the valve body at which the valve element is disposed, the dust prevention mechanism being configured to drop from the valve body when the internal pressure reaches a threshold value to release the internal pressure.

Description

Pressure relief mechanism, dustproof mechanism, battery and power consumption device

Technical Field

The present application relates to the field of battery technology, and more particularly, to a pressure relief mechanism, a dust prevention mechanism, a battery, and an electric device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation 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 on the safety performance of batteries. A pressure relief mechanism is generally provided on a case of the battery so as to release the pressure inside the battery through the pressure relief mechanism when the pressure inside the battery is suddenly increased, thereby preventing the battery from exploding. If the exhaust channel of the pressure relief mechanism is blocked or the pressure relief mechanism is jacked up by external high-pressure water flow, the safety performance of the battery can be affected. Therefore, how to improve the safety performance of the battery is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a pressure release mechanism, dustproof mechanism, battery and power consumption device, can improve the security performance of battery under the condition of not influencing the normal exhaust function of pressure release mechanism.

In a first aspect, a pressure relief mechanism is provided in a box, comprising: the valve body is arranged on the outer wall of the box body and is provided with a first opening; a valve element disposed in the first opening for venting the internal pressure of the tank through the first opening when the internal pressure reaches a threshold value; a dust prevention mechanism covering at least the first opening on the valve body at which the valve element is disposed, the dust prevention mechanism being configured to drop from the valve body when the internal pressure reaches a threshold value to release the internal pressure.

Through set up dustproof mechanism outside the valve body that is provided with the case, can avoid first opening and the clearance between case and the valve body to form exhaust passage direct exposure in the outside environment of box, can effectively avoid outside foreign matter such as dust, mud, rubble to get into exhaust passage. Meanwhile, the dustproof mechanism can fall off from the valve body when the internal pressure of the box body reaches a threshold value, and the normal exhaust function of the pressure relief mechanism cannot be influenced, so that the safety performance of the battery can be improved.

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, the first surface is perpendicular to the thickness direction of the valve body on the valve body and deviates from the surface inside the box body, the side wall covers a second surface of the valve body, the second surface is a surface on the valve body parallel to the thickness direction of the valve body, the dustproof mechanism is provided with a limiting portion, the limiting portion is arranged on the side wall and protrudes out of the side wall in the direction towards the center of the valve body, the second surface of the valve body is provided with a groove, and the groove and the limiting portion are correspondingly arranged and used for accommodating the limiting portion.

The limiting part arranged on the side wall of the dustproof mechanism is accommodated in the groove formed in the second surface of the valve body, so that the dustproof structure cannot easily fall off from the valve body, and external foreign matters such as dust, slurry and broken stones are prevented from entering the exhaust channel, and the pressure relief mechanism can be well protected.

In some embodiments, the limiting part 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; and when the internal pressure reaches a threshold value, the valve body is separated from the groove, so that the dustproof mechanism falls off from the valve body.

Through set up spacing portion on pressure release mechanism, can not reach when the threshold value at internal pressure, for example the internal and external pressure of box is comparatively balanced, perhaps receives under the condition of outside high-pressure rivers impact, dustproof mechanism is difficult for droing from the valve body. Meanwhile, when the internal pressure of the box body reaches a certain threshold value, the limiting part can fall off from the valve body, so that the normal exhaust function of the pressure relief mechanism is not affected, and the safety performance of the battery can be improved.

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

Through setting up recess and the spacing portion that encircles the valve body second surface for no matter receive the impact of the high-pressure rivers of which direction in the pressure release mechanism, dustproof mechanism can not drop because of external force strikes, can guarantee the guard action of dustproof mechanism to valve body and case, thereby can improve the security performance of battery.

In some embodiments, the dust-proof mechanism is made of an elastic material.

The dustproof mechanism is made of elastic materials, so that the dustproof mechanism is easier to fall off when the internal pressure reaches a threshold value, the normal exhaust function of the pressure relief mechanism is guaranteed, and the safety performance of the battery is improved.

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

Through set up the clearance between spacing portion and recess, can be so that spacing portion changes the atress when internal pressure reaches the threshold value and drops, simultaneously, spacing portion when receiving the exogenic action, still can guarantee to cover at the surface of valve body, plays the guard action to valve body and case to can improve the security performance of battery.

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

The protection part can block that high-pressure rivers pass through the gap entering box between valve body and the box inside, also can prevent the entering of outside foreign matter such as dust, mud, rubble to improve the security performance of battery.

In some embodiments, a portion of the dust-proof mechanism other than the stopper portion is attached to a surface of the valve body on which the valve element is provided.

The part of dustproof mechanism except spacing portion and the surface laminating of the valve body that is provided with the case can make dustproof mechanism be difficult for droing with the valve body under the inside and comparatively balanced state of external pressure of box to can play better guard action to pressure release mechanism, improve the security performance of battery.

In a second aspect, a dustproof mechanism is provided for a pressure relief mechanism, the pressure relief mechanism is disposed in the box, the dustproof mechanism includes: the pressure relief mechanism comprises a main body, a pressure relief mechanism and a pressure relief mechanism, wherein the main body comprises a bottom wall and a side wall, the bottom wall is used for covering a first surface of a valve body of the pressure relief mechanism, the first surface is a surface, perpendicular to the thickness direction of the valve body, of the valve body and away from the interior of the box body, the side wall is used for covering a second surface of the valve body, and the second surface is a surface, parallel to the thickness direction of the valve body, of the valve body; spacing portion, spacing portion set up in on the lateral wall, and towards the direction protrusion in the center of valve body the lateral wall, wherein, spacing portion is configured as when the internal pressure of box does not reach the threshold value, prevent dustproof mechanism follows the valve body drops when internal pressure reaches the threshold value, make dustproof mechanism follows the valve body drops.

Set up spacing portion on dustproof mechanism, can be so that dustproof mechanism still can play the guard action to valve body and case when receiving external impact, avoid outside foreign matters such as dust, mud, rubble to get into exhaust passage and influence pressure relief mechanism's exhaust function. Meanwhile, the limiting part can fall off from the valve body when the pressure relief mechanism releases pressure, and the normal exhaust function of the pressure relief mechanism cannot be influenced, so that the safety performance of the battery can be improved.

In some embodiments, the dust-proof mechanism further comprises: the protection part is arranged on the side wall and used for covering a gap between the pressure relief mechanism and the outer wall of the box body.

In a third aspect, a battery is provided, including: the box body is provided with the pressure relief mechanism in any scheme; and the battery cell is accommodated in the box body.

In a fourth aspect, there is provided an electrical device comprising: the battery of any preceding aspect, the battery is used to provide electrical energy for the powered device.

In the embodiment that this application provided, through set up dustproof mechanism outside the valve body that is provided with the case, when the battery box need not the pressure release, dustproof mechanism covers the first opening that is provided with the case on the valve body at least, keeps apart outside foreign matter such as dust, mud, rubble with first opening, can avoid the exhaust passage direct exposure in the outside environment of box that first opening and clearance between case and the valve body formed to avoid being blockked up by outside foreign matter. Simultaneously, when pressure relief mechanism received the impact of outside high-pressure rivers, dustproof mechanism can be more closely with valve body and case laminating, avoids being jack-up by high-pressure rivers. When battery box internal pressure reached the threshold value, the inside gas of battery box needed to be discharged through the exhaust passage among the pressure release mechanism, and dustproof mechanism can drop from the valve body under inside high-pressure gas's effect, also can not influence pressure release mechanism's normal exhaust function to can improve the security performance of battery.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic illustration of a vehicle provided by an embodiment of the present application;

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

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

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

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

fig. 6 is a schematic view of a dust-proof mechanism provided in an embodiment of the present application.

The reference numbers in the detailed description are as follows:

1-a vehicle;

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

110-pressure relief mechanism, 111-first part, 112-second part, 120-valve body, 121-first opening, 122-groove, 130-valve core, 140-dust prevention mechanism, 141-bottom wall, 142-side wall, 143-limiting part, 144-protection part, 145-main body.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

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 application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

In order to meet different power requirements, 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 series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. Alternatively, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted. The battery is further arranged in the electric equipment to provide electric energy for the electric equipment.

The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, and also needs to consider the safety performance of the battery.

In order to prevent the explosion caused by the excessive pressure inside the battery, a pressure relief mechanism is usually disposed on the box body of the battery, so that when the pressure inside the battery reaches a burst pressure value, the high-pressure gas can actuate the pressure relief mechanism, and the pressure inside the battery is released through an exhaust passage disposed in the pressure relief mechanism, thereby preventing the battery from exploding. However, a part of the exhaust channel of the pressure relief mechanism is often communicated with the outside of the battery box body, and is easily influenced by the external environment, so that the safety performance of the battery is affected. For example, when the exhaust passage is too small, the passage is easily blocked by external foreign matters such as dust, mud, gravel and the like, resulting in unsmooth exhaust; when the exhaust passage is too large, the size of the pressure relief mechanism is increased, and the pressure relief mechanism is easy to jack up by external high-pressure water flow, so that the performance requirement of IPX9K cannot be met.

In view of this, this application provides a technical scheme, sets up dustproof mechanism in pressure relief mechanism's exhaust passage outside, can effectively block outside foreign matter such as dust, mud, rubble and get into exhaust passage. Meanwhile, the dustproof mechanism can fall off when the internal pressure of the box body reaches a threshold value, and the normal exhaust function of the pressure relief mechanism is not affected.

As used herein, "activate" means that the pressure relief mechanism is activated such that the internal pressure of the battery case is vented. In this way, the battery box can be vented under controlled pressure or temperature, thereby avoiding a potentially more serious accident.

The technical scheme described in the embodiment of the application is applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecrafts and the like, and the spacecrafts comprise airplanes, rockets, space shuttles, spacecrafts and the like.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described devices, but may also be applied to all devices using batteries, and for brevity of description, the following embodiments are all described by taking an electric vehicle 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 present disclosure, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being configured to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power supply of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation at the start, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1 instead of or in part of fuel or natural gas to provide driving power to the vehicle 1.

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, the battery 10 may include a plurality of battery cells 20 for a structural schematic diagram of the battery 10 according to an embodiment of the present disclosure. The battery 10 may further include a case 11, the inside of the case 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. As shown in FIG. 2, the housing 11 may comprise two parts, referred to herein as a first part 111 (upper housing) and a second part 112 (lower housing), respectively, the first part 111 and the second part 112 snap together. The shape of the first and

second portions

111 and 112 may be determined according to the shape of a combination of a plurality of battery cells 20, and the first and

second portions

111 and 112 may each have one opening. For example, each of the first portion 111 and the second portion 112 may be a hollow rectangular parallelepiped and only one surface of each may be an opening surface, the opening of the first portion 111 and the opening of the second portion 112 are oppositely disposed, and the first portion 111 and the second portion 112 are fastened to each other to form the box 11 having a closed chamber. The plurality of battery cells 20 are connected in parallel or in series-parallel combination and then placed in the case 11 formed by buckling the first part 111 and the second part 112.

Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further led out through the case 11 by the conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.

The number of the battery cells 20 may be set to any number according to different power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power. Since the number of the battery cells 20 included in each battery 10 may be large, the battery cells 20 may be arranged in groups for convenience of installation, each group of the battery cells 20 constituting a battery module. The number of the battery cells 20 included in the battery module is not limited and may be set as required. The battery may include a plurality of battery modules that may be connected in series, parallel, or series-parallel.

The pressure relief mechanism 110 according to the embodiment of the present application is described in detail below with reference to fig. 3 to 5, and the pressure relief mechanism 110 is the pressure relief mechanism 110 disposed on the housing 11, and includes a valve body 120, a valve core 130, and a dust prevention mechanism 140, as shown in fig. 3 to 5. The valve body 120 is disposed on the outer wall of the case 11, and the valve body 120 has a first opening 121; the spool 130 is disposed in the first opening 121, and is configured to discharge the internal pressure through the first opening 121 when the internal pressure of the tank 11 reaches a threshold value; and a dust prevention mechanism 140, wherein the dust prevention mechanism 140 covers at least the first opening 121 of the valve body 120, in which the valve body 130 is disposed, and the dust prevention mechanism 140 is configured to fall off the valve body 120 to release the internal pressure when the internal pressure reaches a threshold value.

The valve body 120 is a portion of the pressure relief mechanism 110 fixedly connected to an outer wall of the housing 11, and the valve body 120 has a first opening 121, and the first opening 121 faces away from the inside of the housing 11 to accommodate the valve element 130. The first opening 121 may also be provided with a portion penetrating the valve body 120 in a thickness direction of the valve body 120 for receiving a guide rod for actuation on the valve spool 130. For example, in fig. 3 to 5, a spring may be disposed around a guide rod of the valve core 130, and when the air pressure inside and outside the housing 11 is in a balanced state, the spring may enable the valve core 130 to be tightly attached to the valve body 120; when the internal pressure of the tank 11 reaches a certain threshold value, the valve spool 130 is actuated by the internal pressure to be separated from the valve body 120, forming a gas discharge passage so that high-pressure gas inside the tank 11 can be discharged.

In the present embodiment, the pressure relief mechanism 110 is further provided with a dust prevention mechanism 140. The dust prevention mechanism 140 is provided on the outer surface of the relief mechanism 110, and covers at least the first opening 121 of the valve body 120 in which the valve body 130 is provided. That is, the dust-proof mechanism 140 covers at least the first opening 121 of the valve body 120, and the valve element 130 is disposed in the first opening 121, so that at least the portion covered by the dust-proof mechanism 140 is the first opening 121 and the valve element 130 disposed in the first opening 121.

When the internal pressure of the tank 11 reaches a threshold value, the valve spool 130 is actuated by the high-pressure gas inside the tank 11 to form an exhaust passage with the valve body 120. Meanwhile, the dust-proof mechanism 140 covering the surface of the valve body 120 is subject to the high-pressure gas rushing out from the exhaust passage to come off the valve body 120, so that the high-pressure gas can be rapidly released, and the safety of the battery can be 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 which is directly exposed to the environment outside the box body 11, and external foreign matters such as dust, mud, gravel and the like can be effectively prevented from entering the exhaust passage. Meanwhile, the dust prevention mechanism 140 can be detached from the valve body 120 when the internal pressure of the case 11 reaches a threshold value, and the normal exhaust function of the pressure relief mechanism 110 is not affected, so that the safety performance of the battery can be improved.

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, the first surface is a surface of the valve body 120 that is perpendicular to a thickness direction of the valve body 120 and faces away from an inside of the box 11, the side wall 142 covers a second surface of the valve body 120, the second surface is a surface of the valve body 120 that is parallel to the thickness direction of the valve body 120, the dust-proof mechanism 140 is provided with a limiting portion 143, the limiting portion 143 is disposed 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, and the groove 122 is disposed corresponding to the limiting portion 143 and is configured to accommodate the limiting portion 143.

In order to prevent external foreign objects such as dust, mud, and gravel from entering the exhaust passage, the dust-proof mechanism 140 may be configured to cover at least a portion of the valve body 120, i.e., the dust-proof structure may cover both the first surface of the valve body 120 and the second surface of the valve body 120. The first surface is perpendicular to the thickness direction of the valve body 120 and faces away from the inside of the box 11, and considering that the valve core 130 is disposed in the first opening 121 of the valve body 120, the first surface is understood to be a surface formed by the valve body 120, the first opening 121 and the valve core 130 together. The second surface is a surface of the valve body 120 parallel to the thickness direction of the valve body 120, i.e., a surface surrounding the valve body 120 in fig. 3 to 5. Accordingly, the dust-proof 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 dust-proof mechanism 140 is provided with a stopper 143, which protrudes from the side wall 142 in a direction toward the center of the valve body 120 and is received in a groove 122 correspondingly provided on the second surface of the valve body 120. For example, the position-limiting portion 143 may be one or more; can be uniformly distributed on the second surface of the valve body 120, or can be arranged at a specific position as required; may be distributed in a lattice form or may be a circle around the valve body 120. The above detailed description of the limiting portion 143 is only exemplary and not limiting.

The limiting part 143 arranged on the side wall 142 of the dustproof mechanism 140 is accommodated in the groove 122 arranged on the second surface of the valve body 120, so that the dustproof mechanism 140 cannot easily fall off from the valve body 120, and external foreign matters such as dust, mud and gravel are prevented from entering the exhaust passage, thereby better protecting the pressure relief mechanism 110.

According to some embodiments of the present application, the stopper 143 is configured to be received 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 the valve body 120; when the internal pressure reaches a threshold value, the groove 122 is disengaged, so that the dust prevention mechanism 140 is disengaged from the valve body 120.

In the case where the internal and external pressures of the housing 11 are relatively balanced, the dust-proof mechanism 140 needs to be maintained in a state of covering the first surface and the second surface of the valve body 11, that is, in the case where the pressure relief mechanism 110 does not need to release the internal pressure, it is undesirable that the dust-proof mechanism 140 falls off from the valve body 120, so that the dust-proof mechanism 140 can prevent external foreign matters from entering the exhaust passage. When the internal pressure reaches a certain threshold value, the pressure relief mechanism 110 needs to release the internal pressure through the first opening 121, and it is desirable that the dust-proof mechanism 140 can be separated from the valve body 120, so that the internal high-pressure gas can be smoothly discharged. Therefore, the stopper 143 needs to be disengaged from the groove 122 so that the dust prevention mechanism 140 is disengaged from the valve body 120, so that the pressure relief mechanism 110 releases the internal pressure through the exhaust passage.

By providing the limiting portion on the pressure relief mechanism 110, the dust prevention mechanism 140 is not easily detached from the valve body 120 when the internal pressure does not reach the threshold value, for example, the internal pressure and the external pressure of the box 11 are relatively balanced, or when the pressure is impacted by external high-pressure water flow. Meanwhile, when the internal pressure of the case 11 reaches a certain threshold, the limiting portion 143 can fall off from the valve body 120 again, so that the normal exhaust function of the pressure relief mechanism 110 is not affected, and the safety performance of the battery can be improved.

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

The groove 122 of the valve body 120 may be disposed to surround the valve body 120 along the second surface of the valve body 120, and accordingly, the stopper 143 may be disposed to surround the sidewall 142 of the dust-proof mechanism 140 and protrude from the sidewall 142 in a direction toward the valve body 120. It should be understood that the groove 122 of the valve body 120 and the position-limiting portion 143 of the dust-proof structure are always disposed correspondingly, so that the position-limiting portion 143 can be always accommodated in the groove 122.

Through the arrangement of the groove 122 and the limiting portion 143 which surround 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 dustproof mechanism 140 cannot fall off due to external impact, the protection effect of the dustproof mechanism 140 on the valve body 120 and the valve core 130 can be ensured, and the safety performance of the battery can be improved.

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

To ensure that the dust-proof mechanism 140 can fall off when the pressure relief mechanism 110 releases the internal pressure, the dust-proof mechanism 140 may be made of an elastic material, for example, may be molded by soft glue. The dust-proof mechanism 140 is deformed by a force when it is impacted by the internal pressure of the case 11, and falls off from the valve body 120, so that the gas is discharged to the outside of the case 11 along the gap between the dust-proof mechanism 140 and the valve body 120 after the gas is discharged through the exhaust passage.

The dustproof mechanism 140 is made of an elastic material, so that the dustproof mechanism 140 can be more easily detached when the internal pressure reaches a threshold value, 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.

The gap between the position-limiting portion 143 and the groove 122 means that the position-limiting portion 143 is not in contact with the inner surface of the groove 122 when the position-limiting portion 143 is received in the groove 122.

Through setting up the clearance between spacing portion 143 and recess 122, can be so that spacing portion 143 changes the atress when internal pressure reaches the threshold value and drops, simultaneously, spacing portion 143 is receiving the exogenic action time, still can guarantee to cover at the surface of valve body 120, to the guard action of playing of valve body 120 and case 130 to can improve the security performance of battery.

According to some embodiments of the present application, optionally, the dust prevention mechanism 140 is provided with a guard portion 144, and the guard portion 144 is provided to the side wall 142 for covering a gap between the valve body 120 and an outer wall of the case 11.

The protector 144 may be a portion of the sidewall 142 extending toward the inside of the case 11 to cover a gap between the valve body 120 and the outer wall of the case 11. Generally, when the valve body 120 is fixedly connected to the outer wall of the housing 11, the surface of the valve body 120 perpendicular to the thickness direction of the valve body 120 and facing the inside of the housing 11 is in close contact with the outer wall of the housing 11, but a certain gap is always present. The guard 144 may thus be used to cover the gap, further reducing the gap. In some possible embodiments, when the dust-proof mechanism 140 is made of an elastic material, a certain amount of pressure may be applied to the outer wall of the housing 11 at the gap between the valve body 120 and the outer wall of the housing 11, so as to achieve a certain degree of sealing effect, and enhance the protection effect of the dust-proof mechanism 140 on the pressure relief mechanism 110.

The protection part 144 can prevent high-pressure water from entering the case 11 through a gap between the valve body 120 and the case 11, and can also prevent external foreign matters such as dust, mud, and crushed stone from entering, thereby improving the safety performance of the battery.

According to some embodiments of the present application, optionally, a portion of the dust-proof mechanism 140 other than the stopper 143 is attached to the surface of the valve body 120 provided with the valve element 130.

As shown in fig. 3 to 5, the dust-proof mechanism 140 may include a sidewall 142 and a bottom wall 141, the bottom wall 141 being attached to a first surface of the valve body 120, and the sidewall 142 being attached to a second surface of the valve body 120. The first surface is a surface of the first opening 121 facing away from the inside of the case 11, and the valve element 130 is disposed in the first opening 121. That is, the bottom wall 141 of the dust-proof mechanism 140 covers both the surfaces of the valve body 120 and the valve spool 130 that are perpendicular to the thickness direction of the valve body 120 and that face away from the inside of the case 11, and the first opening 121. The second surface is a surface of the valve body 120 parallel to the thickness direction of the valve body 120, i.e., a surface surrounding the valve body 120 in fig. 3 to 5. When the side wall 142 of the dust-proof mechanism 140 is provided with the protection portion 144, the protection portion 144 may also be attached to the second surface of the valve body 120.

The part of the dust-proof mechanism 140 except the limiting part 143 is attached to the surface of the valve body 120 provided with the valve core 130, so that the dust-proof mechanism 140 is not easy to fall off from the valve body 120 in a state that the internal and external pressures of the box body 11 are balanced, a good protection effect can be achieved on the pressure relief mechanism 110, and the safety performance of the battery is improved.

The embodiment of the present application further provides a dust-proof mechanism 140, which is used 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 dust-proof mechanism 140 includes a main body 145 and a stopper 143. The main body 145 includes a bottom wall 141 and a side wall 142, the bottom wall 141 is configured to cover 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 the inside of the housing 11, the side wall 142 is configured to cover 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 stopper 143 is provided on the side wall 142 and protrudes from the side wall 142 in a direction toward the center of the valve body 120, wherein the stopper is configured to prevent the dust-proof mechanism 140 from falling off the valve body 120 when the internal pressure of the case 11 does not reach a threshold value, and to allow the dust-proof mechanism 140 to fall off the valve body 120 when the internal pressure reaches the threshold value.

The dust-proof mechanism 140 provided in the embodiment of the present application may be used for the pressure relief mechanism 110, wherein the pressure relief mechanism 110 is disposed on the box 11. In order to prevent external foreign materials such as dust, mud, and debris from entering the exhaust passage of the pressure relief mechanism 110, the main body 145 of the dust prevention mechanism 140 may be disposed to cover at least a portion of the valve body 120. The bottom wall 141 of the dust-proof mechanism 140 can cover a first surface of the valve body 120, that is, a surface of the valve body 120 perpendicular to the thickness direction of the valve body 120 and away from the inside of the housing 11, and considering that the valve core 130 is disposed in the first opening 121 of the valve body 120, the first surface is understood to be a surface formed by the valve body 120, the first opening 121, and the valve core 130 together; the side wall 142 of the dust-proof mechanism 140 can cover a second surface, that is, a surface of the valve body 120 parallel to the thickness direction of the valve body 120.

Meanwhile, the dustproof mechanism 140 further includes a limiting portion 143, and when the air pressure inside the box 11 is relatively balanced with the air pressure outside the box, the limiting portion 143 enables the dustproof mechanism 140 to cover the first opening 121, provided with the valve core 130, of the valve body 120, so that the dustproof mechanism plays a role in blocking external foreign matters such as dust, mud, and gravel from entering the exhaust passage. When the internal pressure of the pressure relief mechanism 110 reaches the threshold value and the internal pressure of the box 11 needs to be released, the limiting portion 143 can be disengaged from the groove 122 formed in the valve body 120 under the action of the internal pressure, and the whole dust-proof mechanism 140 falls off from the pressure relief mechanism 110, so that the normal exhaust function of the pressure relief mechanism 110 is not affected.

The limiting portion 143 is disposed 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 being subjected to external impact, and the exhaust function of the pressure relief mechanism 110 is prevented from being affected by external foreign matters such as dust, mud, and gravel entering the exhaust passage. Meanwhile, the limiting portion 143 can fall off from the valve body 120 when the pressure relief mechanism 110 releases the pressure, and the normal exhaust function of the pressure relief mechanism 110 is not affected, so that the safety performance of the battery can be improved.

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

The side wall 142 of the dust-proof mechanism 140 may further be provided with a protective portion 144, the protective portion 144 is a portion 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. Meanwhile, since there is still a certain gap between the pressure relief mechanism 110 and the outer wall of the box 11, the protection portion 144 is also used to cover the gap between the pressure relief mechanism 110 and the outer wall of the box 11, so as to prevent external foreign objects from entering the inside of the box 11 from the gap and causing potential safety hazards.

The application also provides a battery 10, which comprises a box body 11, wherein the box body 11 is provided with the pressure relief mechanism 110 in any scheme; and a battery cell 20 accommodated in the case 11.

According to some embodiments of the present application, there is also provided an electrical device, including the battery 10 according to any of the above aspects, and the battery 10 is used for providing electrical energy for the electrical device.

According to some embodiments of the present application, the present application provides a pressure relief mechanism 110 comprising a valve body 120, a valve spool 130, and a dust prevention mechanism 140. The valve core 130 is disposed in the first opening 121 of the valve body 120, and the dust-proof 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 can be further provided with a groove 122 which is correspondingly arranged with the limiting part 143 on the dustproof mechanism 140, so that the dustproof mechanism 140 falls off from the valve body 120 when the internal pressure reaches a threshold value, the internal pressure is released, external foreign matters such as dust, mud and gravel can be effectively prevented from entering an exhaust channel under the condition that the normal exhaust function of the pressure relief mechanism 110 is not influenced, and the safety performance of the battery is improved.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

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.